Engine lubricating oil circuit and engine

Abstract

The invention discloses an engine lubricating oil circuit and an engine, and relates to the technical field of motorcycle engines, the engine lubricating oil circuit comprises a shell, a crankshaft chamber is arranged in the shell, and an air cylinder is arranged on the crankshaft chamber; the piston is arranged on the air cylinder and can move between an upper dead center and a lower dead center along the inner wall of the air cylinder; the crank connecting rod assembly is connected with the piston and used for driving the piston to reciprocate in the air cylinder; the oil spraying nozzle is arranged in the shell and located between the crank connecting rod assembly and the piston, and the oil spraying nozzle communicates with the oil supply assembly and is used for spraying one to four spraying oil beams to the piston; and the cooling engine oil collecting structure is arranged at the bottom of the crankshaft cavity in the shell and located on the inner walls of the two sides of the crankshaft cavity, and the cooling engine oil collecting structure is used for recycling engine oil. According to the engine lubricating oil way and the engine, at least one injection oil beam is emitted to the piston, the oil beam can be collected through the cooling engine oil collecting structure so as to be recycled, and the engine oil utilization rate is increased.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of motorcycle engines, and more particularly to an engine lubricating oil circuit. BACKGROUND

[0002] The common piston back cooling structure on the market is single-point injection cooling, usually only a spray oil hole is drilled in the oil channel of the crankcase, so that the angle of the spray oil beam is limited, and the upper and lower dead centers of the piston reciprocating motion cannot be considered to achieve cooling and lubrication of the core area of the piston back.

[0003] Most of the motorcycle engines on the market do not have a separate crankshaft chamber, that is, they do not involve the collection of crankcase oil. A separate crankshaft chamber is commonly found in high-performance engines, such as sports, racing, and off-road motorcycle engines. In order to ensure high performance, these vehicle engines need to keep the resistance of the crankshaft as small as possible, so they need to reduce the coverage of the oil on the crankshaft, and therefore design an independent crankshaft chamber and equip it with an oil pump to remove the falling oil from the crankshaft chamber as soon as possible. The existing crankshaft chamber oil collection structure on the market has not seen any enhancement and optimization measures for the efficiency of oil collection.

[0004] Since the engines on the market usually do not have an independent crankshaft chamber, the crankshaft chamber is in communication with the oil pan chamber where the transmission mechanism is located, and the transmission mechanism is usually lubricated by splashing lubrication when the crankshaft counterweight rotates, or by drip irrigation lubrication through the design of the oil circuit, or by drilling holes for injection lubrication. Such structures have low oil utilization efficiency and poor lubrication effect.

[0005] In summary, how to improve the utilization efficiency of oil is a problem that needs to be solved by the technical personnel in the field. SUMMARY

[0006] Therefore, the purpose of the present application is to provide an engine lubricating oil circuit that can collect the oil beam through a cold oil collection structure after spraying the oil beam on the piston, thereby improving the utilization rate of oil.

[0007] Another purpose of the present application is to provide an engine comprising the above-mentioned engine lubricating oil circuit.

[0008] In order to achieve the above-mentioned purposes, the present application provides the following technical solutions:

[0009] An engine lubricating oil circuit, comprising:

[0010] a housing having a crankshaft chamber therein, and a cylinder above the crankshaft chamber;

[0011] a piston disposed in the cylinder and movable along the inner wall of the cylinder between a top dead center and a bottom dead center;

[0012] a crankshaft assembly connected to the piston and configured to drive the piston to reciprocate in the cylinder;

[0013] an oil nozzle disposed in the interior of the housing and located between the crankshaft assembly and the piston, the oil nozzle being in communication with an oil supply assembly and configured to spray one to four oil jets to the piston;

[0014] a cooling oil collection structure disposed in the housing and located on the inner wall on both sides of the crankshaft chamber, the cooling oil collection structure being configured to recover the oil.

[0015] Preferably, a crankshaft chamber is further included, the crankshaft chamber being in communication with the cylinder, the crankshaft chamber including a left crankcase and a right crankcase, and the left crankcase being provided with a pressure balance hole.

[0016] Preferably, an oil port is provided at the bottom of the crankshaft chamber, a filter screen is provided at the oil port, the oil port is in communication with an oil pump, and the oil pump is configured to pump and spray the oil to a main and auxiliary gear meshing position.

[0017] Preferably, the oil pump is in communication with a main and auxiliary gear oil injection pipe, and a central axis of the main and auxiliary gear oil injection pipe coincides with a main and auxiliary gear meshing line.

[0018] Preferably, the cooling oil collection structure includes an oil groove, and the oil groove is a funnel-shaped structure and is configured to improve the oil collection efficiency.

[0019] Preferably, the oil nozzle is an integrated component with the housing, and the oil nozzle is configured to spray an oil jet to the inside of a rib or a piston pin mounting seat on an exhaust side of the piston.

[0020] Preferably, the oil nozzle includes four oil nozzles, the oil nozzles are in communication with oil channels on the housing, and the oil nozzles are configured to spray oil to the back of the piston and the piston pin.

[0021] Preferably, the oil nozzle includes a first oil nozzle and a fourth oil nozzle, the first oil nozzle is configured to spray oil to a rib of a right mounting seat of the piston pin or an exhaust right side of the back of the piston, and the fourth oil nozzle is configured to spray oil to a rib root of a left mounting seat of the piston pin or an exhaust left side rib root of the piston pin.

[0022] Preferably, the fuel injector further includes a second fuel injector and a third fuel injector, the second fuel injector and the third fuel injector being disposed between the first fuel injector and the fourth fuel injector. The second fuel injector is used to spray engine oil onto the root of the intake side reinforcing rib of the left and right piston pin mounting seats or the root of the exhaust side reinforcing rib of the piston pin mounting seats. The third fuel injector is used to spray engine oil onto the root of the exhaust side reinforcing rib of the left and right piston pin mounting seats or the back of the middle part of the piston exhaust side.

[0023] An engine includes an engine lubrication circuit, wherein the engine lubrication circuit is any one of the engine lubrication circuits described above.

[0024] This invention provides an engine lubrication circuit, in which a cylinder is mounted on a housing, and a piston is mounted inside the cylinder that can move between top dead center and bottom dead center. A crankshaft connecting rod assembly is connected to the piston and is used to drive the piston to reciprocate between top dead center and bottom dead center. A fuel injector is also mounted inside the housing and is connected to a fuel supply assembly, which can spray fuel jets onto the piston to cool it down. After the piston is cooled down, the engine oil is recovered through a cooling oil collection structure, thereby improving the utilization rate of engine oil. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the external structure of the engine lubrication oil circuit provided by the present invention;

[0027] Figure 2 for Figure 1 Cross-sectional view of AA;

[0028] Figure 3 for Figure 1 Cross-sectional view of BB;

[0029] Figure 4 This is a schematic diagram of the internal structure of the engine lubrication oil circuit provided by the present invention;

[0030] Figure 5 This is a schematic diagram of the internal structure of the economical engine housing provided by the present invention;

[0031] Figure 6 A schematic diagram of the piston injection scheme for the economical cooling solution provided by the present invention;

[0032] Figure 7An internal structure diagram of a multi-point injection engine housing provided by the present application;

[0033] Figure 8 A piston injection scheme diagram of a multi-point injection cooling scheme provided by the present application;

[0034] Figure 9 For Figure 8 A diagram of an injection scheme at A-A;

[0035] Figure 10 For Figure 8 A diagram of an injection scheme at B-B;

[0036] Figure 11 For Figure 8 A diagram of an injection scheme at C-C.

[0037] Reference signs:

[0038] 1-housing; 2-cylinder; 3-piston; 4-crank connecting rod assembly; 5-injection nozzle; 501-first injection nozzle; 502-second injection nozzle; 503-third injection nozzle; 504-fourth injection nozzle; 6-cooling machine oil collecting structure; 7-crank chamber; 701-left crank chamber; 702-right crank chamber; 703-air pressure balance hole; 704-oil port; 705-filter screen; 706-oil pump; 707-balance shaft component; 708-balance shaft bearing; 709-oil groove; 8-stiffener; 9-piston pin. DETAILED DESCRIPTION

[0039] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the protection scope of the present application.

[0040] The core of the present application is to provide an engine lubricating oil circuit, in which the machine oil is recycled by the cooling machine oil collecting structure after cooling the piston, thereby improving the utilization rate of the machine oil.

[0041] Another core of the present application is to provide an engine comprising the above-mentioned engine lubricating oil circuit.

[0042] It should be noted that the directions or positional relationships indicated by "up", "down", "front", "back" and the like are based on the directions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0043] The application provides an engine lubricating oil circuit, comprising a shell 1, a piston 3, a crank connecting rod assembly 4, an oil nozzle 5 and a cooling engine oil collecting structure 6.

[0044] The shell 1 is provided with a crank chamber 7 in the shell 1, and the crank chamber 7 is provided with a cylinder 2.

[0045] The piston 3 is arranged in the cylinder 2 and can move along the inner wall of the cylinder 2 between the top dead center and the bottom dead center.

[0046] The crank connecting rod assembly 4 is connected with the piston 3 and is used for driving the piston 3 to reciprocate in the cylinder 2.

[0047] The oil nozzle 5 is arranged in the shell 1 and is located between the crank connecting rod assembly 4 and the piston 3, the oil nozzle 5 is communicated with an oil supply assembly and is used for spraying at least one oil jet to the piston 3.

[0048] The cooling engine oil collecting structure 6 is arranged in the shell 1 and is located on the inner wall on both sides of the crank chamber 7, and the cooling engine oil collecting structure 6 is used for recycling engine oil.

[0049] Specifically, please refer to the accompanying drawings Figure 1 to the accompanying drawings Figure 4 The shell 1 is an engine shell, the upper end of the engine shell is the cylinder 2, the piston 3 is arranged in the cylinder 2, the piston 3 is connected with the crank connecting rod assembly 4, the crank connecting rod assembly 4 can drive the piston 3 to reciprocate between the top dead center and the bottom dead center, the oil nozzle 5 is arranged below the piston 3, the oil nozzle 5 is communicated with the oil supply assembly arranged on the shell 1 and can spray oil jet to the back surface of the piston 3 to realize the cooling of the piston 3, the oil nozzle 5 can spray one to four oil jets to the piston 3, after the cooling of the piston 3 is completed, the cooling engine oil collecting structure 6 arranged in the shell 1 can recycle engine oil, and the recycled engine oil can be used for lubricating other components, so that the utilization rate of the engine oil is improved.

[0050] On the basis of the above embodiment, the crank chamber 7 is further included, the crank chamber 7 is communicated with the cylinder 2, the crank chamber 7 comprises a left crank chamber 701 and a right crank chamber 702, and the left crank chamber 701 is provided with a gas pressure balance hole 703.

[0051] Specifically, the crank chamber 7 is independently designed from the transmission mechanism chamber, the crank chamber 7 is an internal cavity formed by the left crank chamber 701 and the right crank chamber 702, is the installation space and the lubrication space of the crank, the crank connecting rod assembly and other components, the gas pressure balance hole 703 is arranged above the crank bearing and is located in the position deviated from the balance shaft direction, and is usually arranged on the side chamber of the assembled magneto flywheel, the arrangement of the gas pressure balance hole 703 can eliminate the local positive and negative pressure difference and guarantee the collection of engine oil.

[0052] On the basis of the above embodiment, the bottom of the crank chamber 7 is provided with an oil port 704, the oil port 704 is provided with a filter screen 705, the oil port 704 is communicated with an oil pump 706, and the oil pump 706 is used for pumping and spraying oil to the main shaft and auxiliary shaft gear meshing position.

[0053] Specifically, the bottom of the crank chamber 7 is provided with an oil port 704, the oil collected by the falling oil in the crank chamber 7 is collected at the bottom of the crank chamber 7, a filter screen 705 is arranged at the bottom of the crank chamber 7 to filter the oil, and the filtered oil can be recovered by the oil pump 706. The oil pumped by the oil pump 706 passes through the gap between the transmission drum and the shift lever shaft, and is accurately sprayed to the main shaft and auxiliary shaft gear meshing position.

[0054] On the basis of the above embodiment, the crank chamber 7 further comprises a balance shaft component 707, a balance shaft bearing 708 and a balance shaft oil seal, both ends of the balance shaft component 707 are provided with the balance shaft bearing 708, and the balance shaft component 707 is used for reducing the vibration of the shell.

[0055] Specifically, please refer to the accompanying drawings Figure 4 With the accompanying drawings Figure 5 The balance shaft component 707, the balance shaft bearing 708 and the balance shaft oil seal are arranged in the crank chamber 7. When the engine is working, the up-and-down reciprocating movement of the piston 3 and the rotation of the crankshaft will generate inertial force, which will cause the vibration of the engine. Although the crank connecting rod assembly 4 itself can offset part of the inertial force through reasonable design (such as adding a balance weight), there is still a second-order inertial force that has not been offset for some types of engines (such as in-line four-cylinder engines), which will cause the engine to vibrate obviously at medium and high speed. The balance shaft component 707 generates inertial force in the opposite direction of the engine vibration and with the same size to offset or significantly weaken the vibration of the engine, thereby improving the smoothness and comfort. The balance shaft bearing 708 is used for accurately supporting the balance shaft component 707 coaxially to avoid eccentricity.

[0056] On the basis of the above embodiment, the cooling oil collecting structure 6 comprises an oil groove 709, and the oil groove 709 is a funnel-shaped structure and is used for improving the oil collecting efficiency.

[0057] Specifically, the oil groove 709 is arranged on the crankcase of the engine and is funnel-shaped on both sides of the crankshaft bearing, which is large at the top and small at the bottom, and is directed to the bottom of the crank chamber 7. The oil groove 709 is used for the independent crank chamber 7, increases the collection efficiency of the oil that has completed the back cooling of the piston 3 and the oil that has completed the lubrication of the crankshaft, balances the normal pressure of the crank chamber 7, guarantees the normal falling of the oil after completing the back cooling of the piston 3, enhances the collection efficiency of the oil after completing the back cooling of the piston 3, and improves the lightweight of the crankcase.

[0058] Based on the above embodiments, the fuel injector 5 and the housing 1 are an integrated assembly. The fuel injector 5 is used to spray a jet of oil onto the exhaust side reinforcing rib of the piston 3 or the inside of the piston pin mounting seat.

[0059] Specifically, this application discloses two cooling schemes for the back of the piston. This is the first one, namely the economical single-point injection. Please refer to the appendix. Figure 5 With appendix Figure 7 Based on calculations of the piston's reciprocating trajectory and considering the engine's fuel economy, an integrated cast fuel injector is designed and installed on the engine housing.

[0060] The fuel injector 5 is positioned below the bottom dead center of the piston 3, above the crankshaft chamber 7, and below the piston exhaust side, integrated into a housing that connects the oil pump 706 to the oil passage of the engine's hot-engine components.

[0061] The fuel jet of injector 5 ( Figure 5 The design of a) follows the principle of three points in a line: when piston 3 is at top dead center, looking up at the bottom of piston 3, the three points are respectively arranged on the inner side of piston pin mounting seat, the exhaust side reinforcing rib of piston mounting seat, and the top of crankcase fuel injector. Connect these three points in a line, that is, the direction of the fuel jet is inclined towards the intake side and towards the opposite case.

[0062] When piston 3 reaches top dead center, high-pressure cooling oil jets are sprayed onto the inside of the piston pin mounting seat, and the splashing of cooling oil completes the cooling of the back of the piston and the lubrication of the piston pin; when piston 3 is at bottom dead center, high-pressure cooling oil jets are sprayed onto the reinforcing ribs on the exhaust side of the piston, and the splashing completes the cooling of the back of the exhaust side of the piston.

[0063] Based on the above embodiment, the fuel injector 5 includes four injectors, which are connected to the oil passage on the housing 1. The fuel injector 5 is used to spray engine oil onto the back of the piston 3 and the piston pin 9.

[0064] For details, please refer to the appendix. Figure 8 The piston is positioned as follows: the upper part is the right side, the lower part is the left side, the left end is the piston intake side, and the right end is the piston exhaust side. Piston 3 has several reinforcing ribs 8, and the middle part is the piston pin 9. Multi-point jet cooling is implemented: Four cooling oil jets are designed based on precise calculations, and a separately developed piston back-cooling nozzle is installed on the crankcase oil passage. When the piston reciprocates, it covers the entire back of the piston and the piston pin.

[0065] The position of the fuel injector 5 is designed to be below the bottom dead center of the piston 3, above the crankshaft chamber 7, and below the piston exhaust side. It is installed on the housing with an oil passage connecting the oil pump to the engine hot parts. The length of the fuel injector must exceed the mounting seat on the other side of the piston pin.

[0066] The arrangement of the oil jet of the multi-point injection: the engine (piston) left-right direction, 4 oil jets arranged in parallel lines, the coverage area from right to left is one from the right side of the piston to the outer wall of the right side mounting seat of the piston pin, two in the middle between the left and right mounting seats of the piston pin, and one from the left side of the piston to the outer wall of the left side mounting seat of the piston, the engine (piston) front-rear direction, here the exhaust side is front and the intake side is rear. In the front-rear direction, the 4 oil jets are all inclined to the intake side, and the inclination angle meets the three-point-one-line principle of each oil jet.

[0067] It should be noted that the number of oil jets of the multi-point injection can be greater than four, but considering the economy, the selection of 4 oil jets is optimal.

[0068] On the basis of the above embodiment, the oil nozzle 5 includes a first oil nozzle 501 and a fourth oil nozzle 504, the first oil nozzle 501 is used to inject oil to the reinforcing rib of the right side mounting seat of the piston pin or the exhaust right side of the piston back, and the fourth oil nozzle 504 is used to inject oil to the reinforcing rib root of the left side mounting seat of the piston pin or the reinforcing rib root of the exhaust left side of the piston pin.

[0069] Specifically, please refer to the accompanying drawings Figure 9 to the accompanying drawings Figure 11 The piston 3 is located at the upper end, that is, at the top dead center position, and is located at the lower end, that is, at the bottom dead center position, the cooling oil jet ① (right side oil jet): arranged on the outside of the right side mounting seat of the piston pin, the three points are the reinforcing rib of the right side mounting seat of the piston pin, the reinforcing rib of the left side mounting seat of the piston pin, and the cooling oil nozzle of the piston back, and the three points are connected in parallel to the left-right direction.

[0070] When the piston 3 is located at the top dead center, the high-pressure cooling oil jet is injected to the reinforcing rib of the right side mounting seat of the piston pin, forming a splash cooling; when the piston is located at the bottom dead center, the high-pressure cooling oil jet is injected to the exhaust right side of the piston back to complete the cooling.

[0071] The cooling oil jet ④ (left side oil jet): arranged on the outside of the left side mounting seat of the piston pin, the three points are the reinforcing rib of the left side mounting seat of the piston pin, the reinforcing rib of the left side mounting seat of the piston pin, and the cooling oil nozzle of the piston back, and the three points are connected in parallel to the left-right direction.

[0072] When the piston is located at the top dead center, the cooling oil jet is injected to the reinforcing rib root of the left side mounting seat of the piston pin, forming a splash oil end to complete the cooling; when the piston is located at the bottom dead center, the cooling oil jet is injected to the reinforcing rib root of the left side mounting seat of the piston pin, forming a splash oil end to complete the cooling.

[0073] On the basis of the above-mentioned embodiment, the oil nozzle 5 further comprises a second oil nozzle 502 and a third oil nozzle 503, the second oil nozzle 502 and the third oil nozzle 503 are arranged between the first oil nozzle 501 and the fourth oil nozzle 504, the second oil nozzle 502 is used for spraying machine oil to the root of the air inlet side reinforcing rib of the left and right mounting seats of the piston pin or the root of the air outlet side reinforcing rib of the mounting seat of the piston pin, and the third oil nozzle 503 is used for spraying machine oil to the root of the air outlet side reinforcing rib of the left and right mounting seats of the piston pin or the back of the middle part of the air outlet side of the piston.

[0074] Specifically, the cooling oil jet ② (one of the middle oil jets): located in the middle of the piston to the right, the three points are the air inlet side reinforcing rib connecting the left and right mounting seats of the piston pin, the air outlet side reinforcing rib connecting the left and right mounting seats of the piston pin, and the back cooling oil nozzle of the piston, and the three points are connected in parallel to the left and right directions.

[0075] When the piston is at the top dead center, the cooling oil jet sprays to the root of the air inlet side reinforcing rib connecting the left and right mounting seats of the piston pin, the path is blocked by the piston pin, and the lubrication of the piston pin friction pair is completed; when the piston is at the bottom dead center, the high-pressure cooling oil jet sprays to the root area of the air outlet side reinforcing rib of the mounting seat of the piston pin, forms a splashing oil end, and cools the back of the air outlet side of the piston.

[0076] The cooling oil jet ③ (the second of the middle oil jets): located in the middle of the piston, the three points are the air outlet side reinforcing rib connecting the left and right mounting seats of the piston pin, the back of the air outlet side of the piston, and the back cooling oil nozzle of the piston, and the three points are connected in parallel to the left and right directions.

[0077] When the piston is at the top dead center, the high-pressure cooling oil jet sprays to the root of the air outlet side reinforcing rib connecting the left and right mounting seats of the piston pin, and cools the back of the air outlet side of the piston. When the piston is at the bottom dead center, the cooling oil jet sprays to the back of the middle part of the air outlet side of the piston, and cools the back of the air outlet side of the piston.

[0078] In addition to the above-mentioned engine lubricating oil circuit, the application also provides an engine comprising the engine lubricating oil circuit disclosed in the above-mentioned embodiment, and the structures of other parts of the engine refer to the prior art, which will not be described herein.

[0079] In the specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same and similar parts between each embodiment can be referred to each other.

[0080] The engine lubricating oil circuit and the engine provided by the present application are described in detail above. The principles and implementation manners of the present application are described by using specific examples in this paper, and the above description of the examples is only used to help understand the method of the present application and the core idea thereof. It should be pointed out that, for those skilled in the art, some improvements and modifications can be made to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. An engine lubrication oil circuit, characterized in that, include: A housing (1) has a crankshaft chamber (7) inside, and a cylinder (2) is provided on the crankshaft chamber (7); Piston (3) is located in cylinder (2) and can move along the inner wall of cylinder (2) between top dead center and bottom dead center; The crank connecting rod assembly (4) is connected to the piston (3) and is used to drive the piston (3) to reciprocate within the cylinder (2); The fuel injector (5) is located inside the housing (1) and between the crank connecting rod assembly (4) and the piston (3). The fuel injector (5) is connected to the fuel supply assembly and is used to inject at least one fuel jet into the piston (3). The cooling oil collection structure (6) is located inside the housing (1) and on the inner walls on both sides of the crankshaft chamber (7). The cooling oil collection structure (6) is used to recover engine oil.

2. The engine lubrication circuit according to claim 1, characterized in that, The crankshaft chamber (7) is connected to the cylinder (2). The crankshaft chamber (7) includes a left crankshaft housing (701) and a right crankshaft housing (702). The left crankshaft housing (701) is provided with a pressure balance hole (703).

3. The engine lubrication circuit according to claim 1, characterized in that, The bottom of the crankshaft chamber (7) is provided with an oil port (704), and a filter screen (705) is provided at the oil port (704). The oil port (704) is connected to an oil pump (706), which is used to pump oil and spray oil to the meshing position of the main and auxiliary gears.

4. The engine lubrication circuit according to claim 3, characterized in that, The oil pump (706) is connected to the main and auxiliary gear injection pipes, and the central axis of the main and auxiliary gear injection pipes coincides with the meshing line of the main and auxiliary gears.

5. The engine lubrication circuit according to claim 1, characterized in that, The cooling oil collection structure (6) includes an oil trough (709), which is a funnel-shaped structure and is used to improve the oil collection efficiency.

6. The engine lubrication circuit according to claim 1, characterized in that, The fuel injector (5) and the housing (1) are an integrated assembly. The fuel injector (5) is used to spray a jet of oil onto the exhaust side reinforcing rib of the piston (3) or the inside of the piston pin mounting seat.

7. The engine lubrication system according to any one of claims 1 to 5, characterized in that, The fuel injector (5) includes four injectors, which are connected to the oil passage on the housing (1). The fuel injector (5) is used to spray oil onto the back of the piston (3) and the piston pin (9).

8. The engine lubrication circuit according to claim 7, characterized in that, The fuel injector (5) includes a first fuel injector (501) and a fourth fuel injector (504). The first fuel injector (501) is used to inject oil into the reinforcing rib of the piston pin mounting seat on the right side or the right side of the piston exhaust. The fourth fuel injector (504) is used to inject oil into the root of the reinforcing rib of the piston pin intake mounting seat on the left side or the root of the piston pin exhaust reinforcing rib on the left side.

9. The engine lubrication circuit according to claim 8, characterized in that, The fuel injector (5) further includes a second fuel injector (502) and a third fuel injector (503). The second fuel injector (502) and the third fuel injector (503) are disposed between the first fuel injector (501) and the fourth fuel injector (504). The second fuel injector (502) is used to spray engine oil onto the root of the intake side reinforcing rib of the left and right piston pin mounting seats or the root of the exhaust side reinforcing rib of the piston pin mounting seats. The third fuel injector (503) is used to spray engine oil onto the root of the exhaust side reinforcing rib of the left and right piston pin mounting seats or the back of the middle part of the piston exhaust side.

10. An engine, comprising an engine lubrication oil passage, characterized in that, The engine lubrication circuit is the engine lubrication circuit as described in any one of claims 1 to 9.

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