Gas engine

Abstract

Provided is a gas engine capable of improving the responsiveness of a gas injection valve, including: a cylinder liner; a piston configured to reciprocate within the cylinder liner; a cylinder head provided on the cylinder liner; an exhaust valve provided on the cylinder head; a gas injection valve provided on the cylinder head, which injects a gas fuel into a combustion chamber defined by the cylinder liner, the piston, the cylinder head, and the exhaust valve; a gas fuel passage configured by an internal passage formed in the interior of the cylinder head, which supplies the gas fuel to the gas injection valve; a working oil passage configured to supply working oil for operating the gas injection valve to the gas injection valve; and a seal oil passage configured to supply seal oil for sealing the gas fuel to the gas injection valve, at least one of the working oil passage and the seal oil passage being configured by the internal passage formed in the interior of the cylinder head.

Description

Technical Field

[0001] This invention relates to gas engines. Background Technology

[0002] Patent document 1 discloses a gas engine equipped with a gas injection valve that injects gaseous fuel into a combustion chamber.

[0003] Existing technical documents Patent documents Patent Document 1: Japanese Patent Application Publication No. 2017-155735 Summary of the Invention The technical problem that the invention aims to solve In addition to supplying gaseous fuel to the gas injection valve, working oil is also supplied to actuate the gas injection valve. Previously, the oil circuit for supplying working oil to the gas injection valve used external pipelines, but this had technical problems such as large dead volume and occasional gas accumulation, resulting in insufficient responsiveness of the gas injection valve.

[0004] The present invention was made in view of the above-mentioned technical problems, and its main objective is to provide a gas engine that can improve the responsiveness of the gas injection valve.

[0005] Solution to the above technical problems To solve the aforementioned technical problems, one embodiment of the present invention provides a gas engine comprising: a cylinder liner; a piston reciprocatingly disposed within the cylinder liner; a cylinder head disposed on the cylinder liner; an exhaust valve disposed on the cylinder head; a gas injection valve disposed on the cylinder head, injecting gaseous fuel into a combustion chamber divided by the cylinder liner, the piston, the cylinder head, and the exhaust valve; a gaseous fuel passage formed by an internal passage formed within the cylinder head, supplying the gaseous fuel to the gas injection valve; and a working oil passage supplying working oil to the gas injection valve for actuating the gas injection valve, the working oil passage being formed by the internal passage formed within the cylinder head. This improves the responsiveness of the gas injection valve.

[0006] In the above embodiment, it is also possible to further include a sealing oil passage that supplies sealing oil for sealing the gaseous fuel to the gas injection valve. This sealing oil passage is formed as an internal passage within the cylinder head. Thus, the sealing oil passage can also be formed inside the cylinder head.

[0007] In the above-described solution, it is also possible to further include a leakage gas path for recovering the gaseous fuel leaking from the gas injection valve, the leakage gas path being formed as an internal passage within the cylinder head. Thus, the leakage gas path can also be formed inside the cylinder head.

[0008] In the above-described design, both the working oil passage and the sealing oil passage can be formed by internal passages within the cylinder head. The cylinder head has an inlet for the gas fuel passage, an inlet for the working oil passage, and an inlet for the sealing oil passage on one side. This allows the inlets to be concentrated on one side of the cylinder head.

[0009] In the above scheme, the gas injection valve may also have, from bottom to top, a connection port connecting to the gas fuel circuit, a connection port connecting to the sealing oil circuit, and a connection port connecting to the working oil circuit, and the gas fuel circuit, the sealing oil circuit, and the working oil circuit are also formed sequentially from bottom to top. Therefore, since the gas fuel circuit, the sealing oil circuit, and the working oil circuit are formed corresponding to the connection ports of the gas injection valve, a rational internal passage layout can be achieved.

[0010] In the above scheme, the vertical positions of the gas fuel passage, the sealing oil passage, and the working oil passage can also remain unchanged. This allows for a more rational layout of the internal passageways.

[0011] In the above scheme, the sealing oil passage can also be located above the gas fuel passage. This protects the sealing oil passage, which has a higher internal pressure than the gas fuel passage.

[0012] In the above scheme, the sealing oil passage can also be located below the working oil passage. This protects the sealing oil passage, which has a higher internal pressure than the working oil passage.

[0013] In the above-described solution, a pressure accumulator module may be further provided, comprising a pressure accumulator chamber for the gaseous fuel and coupled to the side of the cylinder head. The pressure accumulator module has, on its mating surface with the cylinder head, an outlet connected to an internal passage of the gaseous fuel passage, an outlet connected to an internal passage of the working oil passage, and an outlet connected to an internal passage of the sealing oil passage. This allows the pressure accumulator module to supply gaseous fuel, working oil, and sealing oil to the gaseous fuel passage, working oil passage, and sealing oil passage of the cylinder head.

[0014] In the above scheme, the accumulator module may further include an accumulator chamber for the working oil. Therefore, it is possible to include not only an accumulator chamber for gaseous fuel but also an accumulator chamber for the working oil in the accumulator module.

[0015] In the above scheme, the vertical positions of the internal passages connected to the gas fuel circuit and the internal passages connected to the working oil circuit in the accumulator module can be interchanged. Therefore, by interchangeing the vertical positions of the internal passages in the accumulator module, the vertical positions of the internal passages in the cylinder head can be kept unchanged.

[0016] In the above embodiment, the gas injection valve may also include: a first gas injection valve, with an exhaust port for the exhaust valve located opposite to the cylinder head, positioned in a first horizontal direction parallel to the side surface; and a second gas injection valve, positioned in a second horizontal direction opposite to the first horizontal direction. The gas fuel passage has a first gas fuel passage leading from the side surface to the first gas injection valve and a second gas fuel passage leading from the side surface to the second gas injection valve. The working oil passage has a first working oil passage leading from the side surface to the first gas injection valve and a second working oil passage leading from the side surface to the second gas injection valve. The sealing oil passage has a first sealing oil passage leading from the side surface to the first gas injection valve and a second sealing oil passage leading from the side surface to the second gas injection valve. This allows the internal passages to be concentrated within the cylinder head.

[0017] In the above scheme, the inlets of the first and second gas fuel passages can also be located in the first horizontal direction relative to the inlets of the first and second working oil passages and the first and second sealing oil passages on the side surface, with the second gas fuel passage intersecting the first working oil passage and the first sealing oil passage in a top view. This allows the inlets of the gas fuel passages to be distributed on the first horizontal direction side, and the inlets of the working oil passages and sealing oil passages to be distributed on the second horizontal direction side, thereby achieving a rational layout of the internal passages.

[0018] In the above-described solution, a fastening hole for securing the cylinder head can also be formed between the exhaust port and the side surface of the cylinder head. The first working oil passage and the first sealing oil passage pass through the first horizontal direction relative to the fastening hole, and the second working oil passage and the second sealing oil passage pass through the second horizontal direction relative to the fastening hole. This avoids the fastening hole and simultaneously optimizes the internal passage layout.

[0019] In the above scheme, the first and second gas fuel passages may pass through the first horizontal direction relative to the fastening hole, and the second gas fuel passage, the first working oil passage, and the first sealing oil passage may intersect with the fastening hole in the first horizontal direction when viewed from above. This avoids the fastening hole and optimizes the internal passage layout.

[0020] In the above scheme, the distance from the side to the first gas injection valve can also be greater than the distance from the side to the second gas injection valve. Therefore, since the inlets of the first and second gas fuel paths are allocated on the first horizontal direction side, the length of the first gas fuel path can be made close to the length of the second gas fuel path.

[0021] In the above-described scheme, it is also possible to further include first and second fuel injection valves disposed on the cylinder head and injecting fuel into the combustion chamber. The first fuel injection valve is disposed in a first horizontal direction relative to the exhaust port and in a direction close to the side relative to the first gas injection valve. The second fuel injection valve is disposed in a second horizontal direction relative to the exhaust port and in a direction away from the side relative to the second gas injection valve. Thus, when viewed in a circumferential direction, the arrangement order of the first gas injection valve and the first fuel injection valve can be made consistent with the arrangement order of the second gas injection valve and the second fuel injection valve.

[0022] Invention Effects According to the present invention, the responsiveness of the gas injection valve can be improved. Attached Figure Description

[0023] Figure 1 This is a diagram showing an example of a gas engine.

[0024] Figure 2 This is a perspective view showing an example of a cylinder head and a accumulator module.

[0025] Figure 3 This is a side view showing an example of a cylinder head and accumulator module.

[0026] Figure 4 This is a top view showing an example of a cylinder head and accumulator module.

[0027] Figure 5 This is a cross-sectional view showing an example of a gas injection valve.

[0028] Figure 6 This is a cross-sectional view showing an example of a gas injection valve.

[0029] Figure 7 This is a cross-sectional view showing an example of a gas injection valve.

[0030] Figure 8 This is a side view showing an example of a cylinder head and accumulator module.

[0031] Figure 9 This is a top view showing an example of a cylinder head and accumulator module. Detailed Implementation

[0032] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Furthermore, in this specification and the accompanying drawings, elements identical to those described with respect to previously seen drawings are labeled with the same reference numerals, and detailed descriptions are appropriately omitted.

[0033] Figure 1This is a schematic diagram illustrating an example of the configuration of a gas engine 1 (hereinafter also simply referred to as "engine 1"). Figures 2-4 These are perspective views, side views, and top views showing an example of the configuration of the cylinder head 15 and the accumulator module 40. Figures 5-7 This is a cross-sectional view showing an example of the configuration of the gas injection valve 30. Figure 8 and Figure 9 These are schematic side and top views illustrating an example of the configuration of the cylinder head 15 and the accumulator module 40.

[0034] In the diagram, Z1 is the upward direction, and Z2 is the downward direction. Furthermore, X1 is designated as the right direction, X2 as the left direction, Y1 as the forward direction, and Y2 as the backward direction. The right direction is an example of the first horizontal direction, and the left direction is an example of the second horizontal direction.

[0035] Engine 1 is a marine gas engine capable of burning gaseous fuels. The gaseous fuel is, for example, hydrogen, but is not limited to it; it can also be methane, etc. Engine 1 can burn either exclusively gaseous fuels or a mixture of gaseous fuels and oil fuels. The oil fuel is, for example, heavy oil.

[0036] Engine 1 is configured as a two-stroke single-cycle engine with direct current scavenging, and is installed on large ships such as oil tankers, container ships or car carriers as the main engine for propulsion.

[0037] like Figure 1 As shown, engine 1 is configured as a so-called crosshead type engine, achieving a long stroke. That is, in engine 1, the piston rod 22 supporting piston 21 is connected to the connecting rod 24 connected to crankshaft 23 via crosshead 25.

[0038] Specifically, the engine 1 includes: a base plate 11; a frame 12 mounted on the base plate 11; a cylinder cover 13 mounted on the frame 12; a cylinder liner 14 mounted inside the cylinder cover 13; and a cylinder head 15 mounted on the cylinder liner 14.

[0039] The cylinder liner 14 and cylinder head 15 together form a cylinder 16 with the vertical direction as the axial direction. Engine 1 is an inline multi-cylinder engine with multiple cylinders 16 arranged in a row, but... Figure 1 The diagram shows only the configuration of one cylinder 16.

[0040] Furthermore, the engine 1 includes: a piston 21 disposed within the cylinder liner 14 and capable of reciprocating in the vertical direction; and a crankshaft 23 that rotates in conjunction with the reciprocating motion of the piston 21. The crankshaft 23 serves as the output shaft.

[0041] The base plate 11 forms the crankcase of the engine 1, housing the crankshaft 23 and the bearing 26 that rotatably supports the crankshaft 23. The lower end of the connecting rod 24 is connected to the crankshaft 23 via a crank 27.

[0042] The crosshead 25 is positioned between a pair of guide plates 28 and slides vertically along the guide plates 28. That is, the pair of guide plates 28 guide the vertical sliding of the crosshead 25.

[0043] The crosshead 25 is connected to the piston rod 22 and the connecting rod 24 via the crosshead pin 29. The crosshead pin 29 is integrated with the piston rod 22 and moves up and down as a whole, and is connected with the connecting rod 24 so that the upper end of the connecting rod 24 is the fulcrum for rotation.

[0044] An exhaust valve 18, which is actuated by a valve actuator (not shown), is provided on the cylinder head 15. The cylinder liner 14, piston 21, cylinder head 15, and exhaust valve 18 divide the combustion chamber 17, and the exhaust valve 18 opens and closes the connection between the combustion chamber 17 and the exhaust pipe 19.

[0045] In addition, a gas injection valve 30 is provided on the cylinder head 15 to inject gaseous fuel into the combustion chamber 17. As the gaseous fuel injected into the combustion chamber 17 burns, the piston 21 reciprocates. During this process, the exhaust valve 18 opens, exhaust gas is discharged from the combustion chamber 17 to the exhaust pipe 19, and fresh air is introduced into the combustion chamber 17 through the scavenging port not shown.

[0046] The following is for reference Figures 2-9 The specific composition of the cylinder head 15 and the accumulator module 40 will be explained.

[0047] like Figure 4 and Figure 9 As shown, the cylinder head 15 has: an exhaust port 18p that is opened and closed by an exhaust valve 18; a plurality of mounting holes 152 for mounting the exhaust valve 18; and a plurality of fastening holes 154 for fastening the cylinder head 15 to the cylinder cover 13. The dashed line C in the figure is a center line that passes through the center of the exhaust port 18p and extends in the front-rear direction.

[0048] An exhaust port 18p is formed in the center of the cylinder head 15, and mounting holes 152 are arranged radially outward and circumferentially relative to the exhaust port 18p, surrounding it. Furthermore, fastening holes 154 are also arranged radially outward and circumferentially relative to the mounting holes 152, surrounding the exhaust port 18p.

[0049] Specifically, there are two mounting holes 152 in the forward direction (Y1 direction) and one in the rear direction (Y2 direction) relative to the center of the vent hole 18p. The mounting hole 152 located in the rear direction and on the center line C is also referred to as "mounting hole 152c".

[0050] Furthermore, two fastening holes 154 are formed in the right direction relative to the center line C, two are formed in the left direction, and two are formed on the center line C. Among them, the fastening hole 154 located in the rear direction and on the center line C is also referred to as "fastening hole 154c".

[0051] In this embodiment, two gas injection valves 30 are provided on the cylinder head 15. The gas injection valve 30 located to the right relative to the exhaust port 18p is also referred to as "gas injection valve 30a" (an example of the first gas injection valve), and the gas injection valve 30 located to the left relative to the exhaust port 18p is also referred to as "gas injection valve 30b" (an example of the second gas injection valve). "Gas injection valve 30" is a general term for gas injection valves 30a and 30b.

[0052] In the cylinder head 15, a gas fuel passage 5, a leakage gas passage 6, a sealing oil passage 7, and a working oil passage 8 connected to the gas injection valve 30 are formed. These are constituted by internal passages formed inside the cylinder head 15, thereby improving the responsiveness of the gas injection valve 30.

[0053] Gas fuel passage 5 is a passage for supplying gas fuel to gas injection valve 30. Leakage gas passage 6 is a passage for recovering gas fuel leaking from gas injection valve 30. Sealing oil passage 7 is a passage for supplying sealing oil to gas injection valve 30 to seal the gas fuel. Working oil passage 8 is a passage for supplying working oil to gas injection valve 30 to actuate gas injection valve 30.

[0054] In this embodiment, all passages of the gas fuel passage 5, the leaking gas passage 6, the sealing oil passage 7, and the working oil passage 8 are formed as internal passages, but it is not limited to this. Some passages may also be formed by external pipes instead of internal passages.

[0055] The inlet 51 of the gaseous fuel passage 5, the outlet 61 of the leakage gas passage 6, the inlet 71 of the sealing oil passage 7, and the inlet 81 of the working oil passage 8 are formed on one side 151 of the cylinder head 15 (see reference). Figure 8 and Figure 9 Side 151 is a surface parallel to the left-right direction and facing the rearward direction. A pressure accumulator module 40 is attached to side 151 of cylinder head 15.

[0056] The accumulator module 40 is a module having an accumulator chamber 45 for gaseous fuel and an accumulator chamber 48 for working oil. A gas gate valve 43 is provided on the lower side of the accumulator module 40 (see reference). Figure 3 Gas gate valve 43 is supplied according to the controller 100 (see reference). Figure 1 The solenoid valve is controlled by a control signal.

[0057] In addition, in the cylinder head 15, besides the leakage gas passage 6 located downstream of the gas injection valve 30, a leakage gas passage 62 located upstream of the gas injection valve 30 is also formed. The leakage gas passage 62 is an internal passage for the flow of nitrogen gas, which is used to deliver gaseous fuel leaking from the gas injection valve 30 into the leakage gas passage 6.

[0058] In this embodiment, the gas fuel path 5, the leaking gas path 6, the leaking gas path 62, the sealing oil path 7, and the working oil path 8 are each formed in two ways corresponding to the two gas injection valves 30.

[0059] In the two gas fuel paths 5, the passage located on the right side, from the side 151 to the gas injection valve 30a, is also called "gas fuel path 5a" (an example of the first gas fuel path), and the passage located on the left side, from the side 151 to the gas injection valve 30b, is also called "gas fuel path 5b" (an example of the second gas fuel path). "Gas fuel path 5" is the general term for gas fuel paths 5a and 5b.

[0060] In the two leaking gas paths 6, the path on the right, leading from the side 151 to the gas injection valve 30a, is also called "leaking gas path 6a", and the path on the left, leading from the side 151 to the gas injection valve 30b, is also called "leaking gas path 6b". "Leaking gas path 6" is the collective name for leaking gas paths 6a and 6b.

[0061] In the two leaking gas paths 62, the path leading to the gas injection valve 30a on the right is also called "leaking gas path 62a", and the path leading to the gas injection valve 30b on the left is also called "leaking gas path 62b". "Leaking gas path 62" is the general term for leaking gas paths 62a and 62b.

[0062] In the two sealing oil passages 7, the passage located on the right side, leading from the side 151 to the gas injection valve 30a, is also called "sealing oil passage 7a" (an example of the first sealing oil passage), and the passage located on the left side, leading from the side 151 to the gas injection valve 30b, is also called "sealing oil passage 7b" (an example of the second sealing oil passage). "Sealing oil passage 7" is the general term for sealing oil passages 7a and 7b.

[0063] In the two working oil passages 8, the passage located on the right side, from the side 151 to the gas injection valve 30a, is also called "working oil passage 8a" (an example of the first working oil passage), and the passage located on the left side, from the side 151 to the gas injection valve 30b, is also called "working oil passage 8b" (an example of the second working oil passage). "Working oil passage 8" is the general term for working oil passages 8a and 8b.

[0064] like Figures 5-7As shown, the gas injection valve 30 has a connection port 35 for connecting to the gas fuel line 5, a connection port 36 for connecting to the leaking gas line 6, a connection port 37 for connecting to the sealing oil line 7, and a connection port 38 for connecting to the working oil line 8. These figures are cross-sectional views of the gas injection valve 30 with the angle changed to close so that any one of the connection ports 35 to 38 is visible.

[0065] The gas injection valve 30 includes a lower main body portion 31 and an upper main body portion 32. Connection ports 35 to 38 are formed on the side of the lower main body portion 31, and a nozzle portion 39 with a nozzle hole 391 is provided at the lower end of the lower main body portion 31.

[0066] The lower main body 31 houses a needle valve 33 that opens and closes the nozzle orifice 391, and the upper main body 32 houses a spring 34 that presses the needle valve 33 downward. The lower main body 31 is inserted into the insertion hole of the cylinder head 15, and the front end of the nozzle 39 protrudes into the combustion chamber 17.

[0067] During gas fuel operation, the working oil filling the working oil circuit 8 pushes the needle valve 33 upward through the action of the solenoid valve, thereby injecting the gas fuel filling the gas fuel circuit 5 into the combustion chamber 17 through the nozzle hole 391.

[0068] To prevent gas from leaking upwards through the area around needle valve 33, a higher pressure than that of the gas is applied to the sealing oil filling the sealing oil passage 7.

[0069] In the lower main body 31, a connection port 362 for connecting to the leak gas path 62 is also formed. By flowing nitrogen from the leak gas path 62, the leaked gas is sent into the leak gas path 6.

[0070] The gas injection valve 30 has, from bottom to top, a connection port 35 for connecting to the gas fuel line 5, a connection port 36 for connecting to the leaking gas line 6, a connection port 37 for connecting to the sealing oil line 7, and a connection port 38 for connecting to the working oil line 8.

[0071] That is, connector 36 is located above connector 35, connector 37 is located above connector 36, and connector 38 is located above connector 37. In other words, connector 37 is located below connector 38, connector 36 is located below connector 37, and connector 35 is located below connector 36.

[0072] like Figure 3 and Figure 8 As shown, the gas fuel passage 5, leakage gas passage 6, sealing oil passage 7 and working oil passage 8 formed on the cylinder head 15 also correspond to the connection ports 35 to 38 of the gas injection valve 30, and are formed in this order from bottom to top.

[0073] That is, the leaking gas path 6 is located above the gas fuel path 5, the sealing oil path 7 is located above the leaking gas path 6, and the working oil path 8 is located above the sealing oil path 7. In other words, the sealing oil path 7 is located below the working oil path 8, the leaking gas path 6 is located below the sealing oil path 7, and the gas fuel path 5 is located below the leaking gas path 6.

[0074] Specifically, the gas fuel path 5, the leaking gas path 6, the sealing oil path 7, and the working oil path 8 extend horizontally and their vertical positions do not interchange throughout the entire range from the side 151 to the gas injection valve 30.

[0075] This allows for the rationalization of the layout of the gas fuel path 5, the leaking gas path 6, the sealing oil path 7, and the working oil path 8. Specifically, it enables the gas fuel path 5, the leaking gas path 6, the sealing oil path 7, and the working oil path 8 to be connected in a straight line from the side 151 to the gas injection valve 30, without considering interference with other pathways.

[0076] Furthermore, by positioning the sealing oil passage 7, which has a higher internal pressure than both the gas fuel passage 5 and the working oil passage 8, in a position that is higher than the gas fuel passage 5 and lower than the working oil passage 8, i.e., by positioning the working oil passage 8 further away from the surface, the sealing oil passage 7 can also be protected.

[0077] like Figure 3 and Figure 8 As shown, the accumulator module 40 also includes gas fuel passages 56-58, leakage gas passages 66, sealing oil passages 76, and working oil passages 86-88. These are formed by internal passages within the accumulator module 40.

[0078] Gas fuel passages 56-58 are passages connected to gas fuel passage 5 of cylinder head 15. Leakage gas passage 66 is a passage connected to leakage gas passage 6 of cylinder head 15. Sealing oil passage 76 is a passage connected to sealing oil passage 7 of cylinder head 15. Working oil passages 86-88 are passages connected to working oil passage 8 of cylinder head 15.

[0079] The outlet 59 of the gas fuel passage 56, the inlet 69 of the leakage gas passage 66, the outlet 79 of the sealing oil passage 76, and the outlet 89 of the working oil passage 86 are formed on the mating surface 401 of the accumulator module 40 that engages with the side surface 151 of the cylinder head 15 (see reference). Figure 8 and Figure 9 ).

[0080] The outlet 59 of the gaseous fuel passage 56, the inlet 69 of the leaking gas passage 66, the outlet 79 of the sealing oil passage 76, and the outlet 89 of the working oil passage 86 are combined with the inlet 51 of the gaseous fuel passage 5, the outlet 61 of the leaking gas passage 6, the inlet 71 of the sealing oil passage 7, and the inlet 81 of the working oil passage 8 formed on the side 151 of the cylinder head 15.

[0081] Gas fuel passage 57 extends forward from the gas pipe connection 44 located on the upper part of the rear surface of the accumulator module 40 to the accumulator chamber 45. Gas fuel passage 58 extends downward from the accumulator chamber 45 to the gas gate valve 43. Gas fuel passage 56 extends forward from the middle of gas fuel passage 58 to the outlet 59 of the mating surface 401.

[0082] The leaking gas path 66 extends from the outlet 69 of the mating surface 401 in a rearward and upward direction to the gas pipe connection 44. The sealing oil path 76 extends from the lower surface of the accumulator module 40 in an upward and forward-upward direction to the outlet 79 of the mating surface 401.

[0083] The working oil passage 86 extends forward and upward from the oil pipe connection 80 located on the lower rear surface of the accumulator module 40 to the outlet 89 of the mating surface 401. The working oil passage 87 extends forward and upward from the oil pipe connection 80 to the accumulator chamber 48. The working oil passage 88 branches off from the middle of the working oil passage 86 and connects to the gas gate valve 43.

[0084] In the accumulator module 40, the gas fuel passages 56-58, the leakage gas passage 66, the sealing oil passage 76, and the working oil passages 86-88 are interchanged in their vertical positions within the range from the front surface to the rear surface of the accumulator module 40.

[0085] Specifically, on the mating surface 401, the outlet 59 of the gas fuel passage 56 and the inlet 69 of the leaking gas passage 66 are located in a lower direction than the outlet 79 of the sealing oil passage 76 and the outlet 89 of the working oil passage 86, while the gas pipe connection 44 connecting the gas fuel passage 57 and the leaking gas passage 66 is located in a higher direction than the oil pipe connection 80 connecting the working oil passage 86 and the lower surface of the pressure accumulator module 40 connecting the sealing oil passage 76. The upper and lower positions are interchanged midway.

[0086] In this way, by interchanging the upper and lower positions of the gas fuel passages 56-58, the leakage gas passage 66, the sealing oil passage 76, and the working oil passages 86-88 in the accumulator module 40, the upper and lower positions of the gas fuel passage 5, the leakage gas passage 6, the sealing oil passage 7, and the working oil passage 8 in the cylinder head 15 can be kept from being interchanged.

[0087] like Figure 4 and Figure 9As shown, a fuel injection valve 90 for injecting fuel into the combustion chamber 17 is further provided on the cylinder head 15 (see reference). Figure 9 Furthermore, an insertion hole 92 for inserting a fuel injection valve 90 is formed on the cylinder head 15 (see reference). Figure 4 ).

[0088] In this embodiment, two fuel injection valves 90 are provided on the cylinder head 15. The fuel injection valve 90 located to the right relative to the exhaust port 18p is also referred to as "fuel injection valve 90a" (an example of the first fuel injection valve), and the fuel injection valve 90 located to the left relative to the exhaust port 18p is also referred to as "fuel injection valve 90b" (an example of the second fuel injection valve). "Fuel injection valve 90" is a general term for fuel injection valves 90a and 90b.

[0089] Furthermore, the insertion hole 92, which is located to the right relative to the exhaust hole 18p and is used for the insertion of the fuel injection valve 90a, is also referred to as "insertion hole 92a," and the insertion hole 92, which is located to the left relative to the exhaust hole 18p and is used for the insertion of the fuel injection valve 90b, is also referred to as "insertion hole 92b." "Insertion hole 92" is a general term for insertion holes 92a and 92b.

[0090] Gas injection valve 30a and fuel injection valve 90a are disposed between two fastening holes 154 located to the right relative to the center line C, and gas injection valve 30b and fuel injection valve 90b are disposed between two fastening holes 154 located to the left relative to the center line C.

[0091] In this embodiment, the engine 1 can cause the fresh air introduced into the combustion chamber 17 to swirl according to the direction of the scavenging port (not shown), thereby forming a so-called vortex SW. Figure 9 In the example, the vortex SW is formed in a counterclockwise direction when viewed from above.

[0092] The fuel injection valve 90 is positioned upstream of the gas injection valve 30 in the vortex SW. That is, the fuel injection valve 90a, located to the right, is positioned in the rear direction (near the side 151) relative to the gas injection valve 30a, and the fuel injection valve 90b, located to the left, is positioned in the front direction (away from the side 151) relative to the gas injection valve 30b.

[0093] In other words, the gas injection valve 30a, located to the right, is positioned forward relative to the fuel injection valve 90a, and the gas injection valve 30b, located to the left, is positioned rearward relative to the fuel injection valve 90b. Therefore, the distance Da from the side 151 to the gas injection valve 30a is greater than the distance Db from the side 151 to the gas injection valve 30b.

[0094] like Figure 4 and Figure 9As shown, on the side 151 of the cylinder head 15, the inlet 51 of the gas fuel passages 5a and 5b and the outlet 61 of the leakage gas passages 6a and 6b are located to the right relative to the inlet 81 of the working oil passages 8a and 8b and the inlet 71 of the sealing oil passages 7a and 7b.

[0095] Specifically, the inlet 51 of the gaseous fuel paths 5a and 5b is located offset to the right from the centerline C. The gaseous fuel paths 5a and 5b branch from one inlet 51. The outlet 61 of the leaking gas paths 6a and 6b is located close to the inlet 51 of the gaseous fuel paths 5a and 5b.

[0096] The inlet 81 of the working oil passage 8a and the inlet 71 of the sealing oil passage 7a are formed at a position slightly offset to the right from the center line C, while the inlet 81 of the working oil passage 8b and the inlet 71 of the sealing oil passage 7b are formed at a position offset to the left from the center line C.

[0097] The working oil passage 8a and the sealing oil passage 7a extend to the right of the mounting hole 152c and the fastening hole 154c, which are located behind the vent hole 18p and on the centerline C, and to the gas injection valve 30a. The working oil passage 8b and the sealing oil passage 7b extend to the left of the mounting hole 152c and the fastening hole 154c and to the left of the gas injection valve 30b.

[0098] Gas fuel line 5a and leakage gas line 6a extend to the right of mounting hole 152c and fastening hole 154c to gas injection valve 30a. Gas fuel line 5b and leakage gas line 6b intersect with working oil line 8a and sealing oil line 7a in top view, and extend to gas injection valve 30b between mounting hole 152c and fastening hole 154c.

[0099] Specifically, the gaseous fuel passage 5b and the leaking gas passage 6b pass to the right of the fastening hole 154c, between the mounting hole 152c and the fastening hole 154c, and to the left of the mounting hole 152c. Furthermore, the gaseous fuel passage 5b and the leaking gas passage 6b intersect with the working oil passage 8a and the sealing oil passage 7a to the right of the fastening hole 154c when viewed from above.

[0100] As described above, the gas fuel lines 5a and 5b, the leaking gas lines 6a and 6b, the sealing oil lines 7a and 7b, and the working oil lines 8a and 8b extend horizontally and their vertical positions do not interchange. Therefore, the gas fuel lines 5b and the leaking gas lines 6b intersect with the working oil lines 8a and the sealing oil lines 7a when viewed from above, while forming a straight line.

[0101] Furthermore, since gas injection valve 30a is farther from side 151 than gas injection valve 30b (Da > Db), by setting the inlet 51 of gas fuel passages 5a and 5b to the right relative to the center line C, the lengths of gas fuel passages 5a and 5b can be made approximately the same. Thus, the amount of gas fuel supplied to gas injection valves 30a and 30b can be made approximately the same.

[0102] Additionally, when the eddy current SW is... Figure 9 In the opposite clockwise direction, the gas injection valve 30 and the fuel injection valve 90 are in opposite positions. That is, the gas injection valve 30a, located to the right, is positioned in the rear direction relative to the fuel injection valve 90a, and the gas injection valve 30b, located to the left, is positioned in the front direction relative to the fuel injection valve 90b.

[0103] At this time, the positional relationship of the inlet 51 of gas fuel lines 5a and 5b, the outlet 61 of leaking gas lines 6a and 6b, the inlet 71 of sealing oil lines 7a and 7b, and the inlet 81 of working oil lines 8a and 8b is reversed left and right relative to the center line C (that is, the inlet 51 of gas fuel lines 5a and 5b is set to the left relative to the center line C, and the gas injection valve 30b becomes an example of the first gas injection valve, and the gas injection valve 30a becomes an example of the second gas injection valve).

[0104] The embodiments of the present invention have been described above, but the present invention is not limited to the embodiments described above, and those skilled in the art can certainly make various modifications.

[0105] Explanation of reference numerals in the attached figures 1. Gas engine 11. Base Plate 12 racks 13 Cylinder Cover 14 Cylinder Liner 15 Cylinder head 16 cylinders 17 Combustion Chamber 18. Exhaust valve 19 Exhaust pipe 21 Pistons 22 Piston rod 23 Crankshaft 24-link 25 Crosshead 26 bearings 27 Crank 28 Guide Board 29 Crosshead Pin 30 (30a, 30b) Gas injection valve 31 Lower Main Body 32 Upper body part 33 Needle valve 34 Springs 35-38 Connection Port 39 Nozzle section 391 Nozzle orifice 40 accumulator module 43 Gas gate valve 44 Gas pipeline connection 45. Accumulator 48. Accumulator 5 (5a, 5b) Gas fuel route 51 Flow Inlet 56-58 Gas fuel route 59 Outlet 6 (62a, 62b) Leaking gas path 61 Outlet 62 (62a, 62b) Leaking Gas Path 66. Leaking gas path 69 Flow Inlet 7 (7a, 7b) Sealing oil passages 71 Inlet 76 Sealed oil circuit 79 Outlet 8 (8a, 8b) Working oil circuit 81 Flow Inlet 86-88 Working oil circuit 89 Outlet 80 Oil pipeline connection 90 (90a, 90b) Fuel Injection Valve 92 (92a, 92b) Insertion Hole 100 controller 18-pin exhaust port 151 Side View 152 mounting holes 154 Fastening Holes 401 Joint surface.

Claims

1. A gas engine, characterized in that, have: Cylinder liner; The piston is disposed within the cylinder liner and is capable of reciprocating motion. Cylinder head, mounted on the cylinder liner; An exhaust valve is located in the cylinder head; A gas injection valve is disposed on the cylinder head and injects gaseous fuel into the combustion chamber divided by the cylinder liner, the piston, the cylinder head and the exhaust valve; The gaseous fuel passage is formed by an internal passage inside the cylinder head, which supplies the gaseous fuel to the gas injection valve. And a working oil circuit, supplying working oil to the gas injection valve to actuate the gas injection valve. The working oil route is formed by an internal passage inside the cylinder head.

2. The gas engine as described in claim 1, characterized in that, Furthermore, it includes a sealing oil passage for supplying sealing oil to the gas injection valve for sealing the gaseous fuel. The sealing oil route is formed by an internal passage inside the cylinder head.

3. The gas engine as described in claim 1, characterized in that, Furthermore, it includes a path for recovering leaked gas from the gaseous fuel leaking from the gas injection valve. The leaking gas route is formed by an internal passage inside the cylinder head.

4. The gas engine as described in claim 2, characterized in that, Both the working oil passage and the sealing oil passage are formed by internal passages inside the cylinder head. The cylinder head has an inlet for the gas fuel passage, an inlet for the working oil passage, and an inlet for the sealing oil passage on one side.

5. The gas engine as described in claim 4, characterized in that, The gas injection valve has, from bottom to top, a connection port for connecting to the gas fuel circuit, a connection port for connecting to the sealing oil circuit, and a connection port for connecting to the working oil circuit. The gas fuel path, the sealing oil path, and the working oil path are also formed sequentially from bottom to top.

6. The gas engine as described in claim 5, characterized in that, The vertical positions of the gas fuel circuit, the sealing oil circuit, and the working oil circuit are not interchanged.

7. The gas engine as claimed in claim 4, characterized in that, The sealing oil passage is located above the gas fuel passage.

8. The gas engine as claimed in claim 4, characterized in that, The sealing oil passage is located below the working oil passage.

9. The gas engine as claimed in claim 4, characterized in that, It further includes a pressure accumulator module having a pressure accumulator chamber for the gaseous fuel and being engaged with the side of the cylinder head. The accumulator module has an outlet for an internal passage connected to the gas fuel circuit, an outlet for an internal passage connected to the working oil circuit, and an outlet for an internal passage connected to the sealing oil circuit on the mating surface with the cylinder head.

10. The gas engine as claimed in claim 9, characterized in that, The accumulator module further includes an accumulator chamber for the working oil.

11. The gas engine as claimed in claim 9, characterized in that, In the accumulator module, the internal passages connected to the gas fuel circuit and the internal passages connected to the working oil circuit are interchanged in terms of their vertical positions.

12. The gas engine as claimed in claim 4, characterized in that, The gas injection valve includes: a first gas injection valve having an exhaust port for the exhaust valve located opposite to the cylinder head, positioned in a first horizontal direction parallel to the side surface; and a second gas injection valve positioned in a second horizontal direction opposite to the first horizontal direction. The gas fuel path has a first gas fuel path leading from the side to the first gas injection valve, and a second gas fuel path leading from the side to the second gas injection valve. The working oil circuit has a first working oil circuit leading from the side to the first gas injection valve, and a second working oil circuit leading from the side to the second gas injection valve. The sealing oil passage has a first sealing oil passage leading from the side to the first gas injection valve, and a second sealing oil passage leading from the side to the second gas injection valve.

13. The gas engine as claimed in claim 12, characterized in that, On the stated side, the inlets of the first gas fuel passage and the second gas fuel passage are located in the first horizontal direction relative to the inlets of the first working oil passage and the second working oil passage, as well as the inlets of the first sealing oil passage and the second sealing oil passage. The second gas fuel line intersects with the first working oil line and the first sealing oil line when viewed from above.

14. The gas engine as claimed in claim 13, characterized in that, A fastening hole for securing the cylinder head is formed between the exhaust port and the side surface of the cylinder head. The first working oil passage and the first sealing oil passage pass through the first horizontal direction relative to the fastening hole. The second working oil passage and the second sealing oil passage pass through the second horizontal direction relative to the fastening hole.

15. The gas engine as claimed in claim 14, characterized in that, The first gas fuel passage and the second gas fuel passage pass through the first horizontal direction relative to the fastening hole. The second gas fuel passage, the first working oil passage, and the first sealing oil passage intersect with the fastening hole in the first horizontal direction when viewed from above.

16. The gas engine as claimed in claim 13, characterized in that, The distance from the side to the first gas injection valve is greater than the distance from the side to the second gas injection valve.

17. The gas engine as claimed in claim 13, characterized in that, It further includes a first fuel injection valve and a second fuel injection valve disposed in the cylinder head for injecting fuel into the combustion chamber. The first fuel injection valve is disposed in the first horizontal direction relative to the exhaust port and in a direction close to the side relative to the first gas injection valve. The second fuel injection valve is disposed in the second horizontal direction relative to the exhaust port and in a direction away from the side relative to the second gas injection valve.

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