Piston oil cooling lubricating structure of horizontal double-cylinder motorcycle engine
By setting the left lubricating oil passage and the right lubricating oil passage in the crankcase of the motorcycle engine, and using the matching oil passage guide piston injector, the problem of complex and not compact cooling structure of the existing twin-cylinder motorcycle engine is solved, and efficient lubricating cooling and structural compactness of the piston is achieved.
Patent Information
- Application Number
- CN202422634977.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-30
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-10-30
AI Technical Summary
The piston cooling structure of existing twin-cylinder motorcycle engines is complex and not compact enough, which affects the overall structural compactness and cooling effect of the engine.
The left lubricating oil passage and the right lubricating oil passage are arranged in the crankcase, and the lubricating oil is guided to the piston oil injector through the matching oil passage. The structure is compact to prevent the oil passage from leaking at the docking point. The piston oil injector is directly aimed at the back of the piston for lubrication and cooling.
It realizes efficient lubrication and cooling of the piston, reduces oil duct leakage, and improves the structural compactness and cooling effect of the engine.
Smart Images
Figure CN223136224U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of motorcycle engines, and particularly relates to a piston oil cooling and lubricating structure of a horizontal twin-cylinder motorcycle engine. Background Technique
[0002] The twin-cylinder engine of a motorcycle means that the engine has two cylinders, and these two cylinders work together to provide power for the motorcycle. Compared with a single-cylinder engine, the twin-cylinder engine has two pistons doing work alternately, the power output is more uniform, the vibration is reduced, and the riding experience is more comfortable; at the same time, compared with a single-cylinder engine, the working load of each cylinder is relatively small, so the heat dissipation effect is better and the engine life is longer.
[0003] Chinese Patent with application number 2015208753767 discloses a piston cooling device for a motorcycle twin-cylinder engine, which includes a cylinder block, a piston, a crankcase and a crankshaft connecting rod assembly. The crankshaft connecting rod assembly is arranged in the crankcase. There are two cylinder blocks, and pistons are respectively arranged in the two cylinder blocks. The pistons are connected with the crankshaft connecting rod assembly. Annular oil pipes are respectively arranged above the two pistons in the crankcase, and a plurality of piston injection nozzles are arranged on the annular oil pipes; the annular oil pipe is connected with an injection control valve. The injection control valve includes a valve body with a cavity. An oil inlet channel and an oil outlet are arranged on the valve body. The oil outlet is communicated with the annular oil pipe. An annular plug is arranged in the oil inlet channel. A ball valve is arranged at the port of the annular plug. A spring is arranged between the ball valve and the oil outlet. When the engine speed is relatively small, the oil pressure is relatively small, the spring naturally extends, the ball valve contacts the annular plug to block the oil inlet channel; when the engine speed is large enough, the oil pressure increases and presses the ball valve, compresses the spring, and a gap is generated between the ball valve and the annular plug, so that the oil can enter the cavity through the oil inlet channel, enter the annular oil pipe from the oil outlet, and be sprayed onto the piston through a plurality of piston injection nozzles to cool the piston comprehensively. This piston cooling structure is relatively complex, and the oil passage is external, which will increase the volume of the engine and the structure is not compact enough. Summary of the Invention
[0004] Aiming at the above deficiencies existing in the prior art, the purpose of the utility model is to provide a piston oil cooling and lubricating structure of a horizontal twin-cylinder motorcycle engine, so as to solve the problems that the piston cooling structure of the existing twin-cylinder engine is complex and not compact enough.
[0005] In order to solve the above technical problems, the utility model adopts the following technical scheme:
[0006] A piston oil-cooling lubrication structure for a horizontal twin-cylinder motorcycle engine, comprising a crankcase body and a cylinder block mounted on one side of the crankcase body. The crankcase body is formed by connecting a left crankcase and a right crankcase. Inside the crankcase body, there are two piston oil nozzles arranged towards the back of the piston. On the cylinder block docking surface of the crankcase body, there are a left lubricating oil passage and a right lubricating oil passage. The left lubricating oil passage and the right lubricating oil passage are respectively arranged on the left crankcase and the right crankcase. One end of the right lubricating oil passage is connected to an oil outlet passage inside the right crankcase. On both the left lubricating oil passage and the right lubricating oil passage, there is a piston lubricating oil passage connected to the oil inlet of the corresponding side piston oil nozzle. On the cylinder block's body docking surface, there is a mating oil passage for connecting the left lubricating oil passage and the right lubricating oil passage. The left and right sides of the mating oil passage respectively cooperate with the left lubricating oil passage and the right lubricating oil passage. In the middle of the mating oil passage, there is an oil passage leading towards the cylinder head. In this way, when the oil pump pumps lubricating oil from the crankcase body towards the cylinder block, the lubricating oil first enters the right lubricating oil passage, the mating oil passage, and the left lubricating oil passage through the oil outlet passage of the crankcase, and then is guided to the corresponding side piston oil nozzle through the left lubricating oil passage and the right lubricating oil passage. In the above oil circuit, the lubricating oil in the right lubricating oil passage is guided to the left lubricating oil passage through the mating oil passage. The structure is compactly arranged, which can avoid leakage from the docking gap after the oil passage passes through the docking part of the left crankcase and the right crankcase. The piston oil nozzle is arranged facing the back of the piston, and the sprayed lubricating oil can directly reach the back of the piston. Since the temperature at the back of the piston is the highest, this setting can effectively ensure the piston lubrication and cooling effect.
[0007] Further, the cross-sections of the mating oil passage, the left lubricating oil passage, and the right lubricating oil passage are all semi-circular. The left lubricating oil passage and the right lubricating oil passage are arranged along the outer edge of the cylinder hole of the crankcase body, and are located on the left and right sides of the docking part of the left crankcase and the right crankcase, and there is a spacing between the left lubricating oil passage and the right lubricating oil passage. In this way, the left lubricating oil passage and the right lubricating oil passage are arranged along the outer edge of the cylinder hole, and will not interfere with the bolt connection holes arranged at the docking end, and the structure is compact. After the right lubricating oil passage, the left lubricating oil passage, and the mating oil passage are all semi-circular, after the cylinder block and the crankcase body are fixed together, a circular oil passage can be formed at the mating section of the mating oil passage and the right lubricating oil passage, and the mating section of the mating oil passage and the left lubricating oil passage, and the lubricating oil is guided more smoothly and quickly.
[0008] Further, the mating oil passage includes an oil inlet passage and a crankcase body oil return passage. The oil inlet passage corresponds to and cooperates with the oil outlet passage of the right crankcase, and the crankcase body oil return passage corresponds to and cooperates with the left lubricating oil passage. In this way, the oil inlet passage of the mating oil passage can guide the lubricating oil in the oil outlet passage to the crankcase body oil return passage, and the crankcase body oil return passage can guide the lubricating oil to the left lubricating oil passage. Description of the Drawings
[0009] Figure 1 It is a side view of the crankcase body in the embodiment;
[0010] Figure 2 It is a schematic three-dimensional structure diagram of the cylinder block in the embodiment. Detailed implementation manners
[0011] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. Components of the embodiments of the present utility model generally described and illustrated in the drawings herein may be arranged and designed in a variety of different configurations. Therefore, the detailed description of the embodiments of the present utility model provided in the drawings is not intended to limit the scope of the present utility model to be protected, but merely represents selected embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.
[0012] It should be noted that like reference numerals and letters denote like items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship when the inventive product is normally placed. This is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation of the present utility model. In addition, the terms "first", "second", "third", etc. are only used for descriptive distinction and cannot be understood as indicating or implying relative importance. In addition, terms such as "horizontal" and "vertical" do not mean that the components are required to be absolutely horizontal or hanging, but can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and does not mean that the structure must be completely horizontal, but can be slightly inclined. In the description of the present utility model, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.
[0013] Such as Figure 1 、 Figure 2As shown in the figure, the piston oil cooling and lubrication structure of the horizontal double-cylinder motorcycle engine provided in this embodiment includes a crankcase body and a cylinder block 5 installed on one side of the crankcase body. The crankcase body is formed by connecting a left crankcase 2 and a right crankcase 1. A piston oil injector 4 is provided in both the left crankcase 2 and the right crankcase 1 and is arranged facing the back of the piston. A left lubricating oil passage 32 and a right lubricating oil passage 31 are provided on the cylinder block docking surface 3 of the crankcase body. The left lubricating oil passage 32 and the right lubricating oil passage 31 are respectively arranged on the left crankcase 2 and the right crankcase 1. One end of the right lubricating oil passage 31 is connected to the oil outlet passage 12 in the right crankcase 1. A piston lubricating oil passage 33 communicating with the oil inlet of the corresponding side piston oil injector 4 is provided on both the left lubricating oil passage 32 and the right lubricating oil passage 31. A mating oil passage 52 for communicating the left lubricating oil passage 32 and the right lubricating oil passage 31 is provided on the cylinder block docking surface 51 (the surface corresponding and mating with the crankcase side surface) of the cylinder block 5. The left and right sides of the mating oil passage 52 are respectively in corresponding mating with the left lubricating oil passage 32 and the right lubricating oil passage 31. An oil passage 53 leading towards the cylinder head direction is provided in the middle of the mating oil passage 52. In this way, when the oil pump pumps the lubricating oil from the crankcase body towards the cylinder block 5, the lubricating oil enters the right lubricating oil passage 31, the mating oil passage 52, and the left lubricating oil passage 32 successively through the oil outlet passage 12 of the crankcase, and then is guided to the piston oil injector 4 on the corresponding side through the left lubricating oil passage 32 and the right lubricating oil passage 31. In the above oil circuit, the lubricating oil in the right lubricating oil passage 31 is guided to the left lubricating oil passage 32 through the mating oil passage 52. The structure is compactly arranged, which can avoid leakage from the docking gap after the oil passage passes through the docking part of the left crankcase 2 and the right crankcase 1. The piston oil injector 4 is arranged facing the back of the piston, and the sprayed lubricating oil can directly reach the back of the piston. Since the temperature at the back of the piston is the highest, this setting can effectively ensure the piston lubrication and cooling effect.
[0014] Furthermore, the cross-sections of the mating oil passage 52, the left lubricating oil passage 32, and the right lubricating oil passage 31 are all semi-circular. The left lubricating oil passage 32 and the right lubricating oil passage 31 are arranged along the outer edge of the cylinder hole of the crankcase body and are located on the left and right sides of the docking surface of the left crankcase 2 and the right crankcase 1 (and inside the connecting bolt holes on the cylinder block docking surface). There is a spacing between the left lubricating oil passage 32 and the right lubricating oil passage 31. In this way, the left lubricating oil passage 32 and the right lubricating oil passage 31 are arranged along the outer edge of the cylinder hole and will not interfere with the bolt connection holes provided at the docking end, and the structure is compact. After the right lubricating oil passage 31, the left lubricating oil passage 32, and the mating oil passage 52 are all semi-circular, after the cylinder block 5 and the crankcase body are fixed together, a circular oil passage can be formed at the mating section of the mating oil passage 52 and the right lubricating oil passage 31 and the mating section of the mating oil passage 52 and the left lubricating oil passage 32, and the lubricating oil is guided more smoothly and quickly.
[0015] Further, the mating oil passage 52 includes an oil inlet passage 521 and a housing oil return passage 522. The oil inlet passage 521 corresponds to and mates with the oil outlet passage 12, and the housing oil return passage 522 corresponds to and mates with the left lubricating oil passage 32. In this way, the oil inlet passage of the mating oil passage 52 can direct the lubricating oil in the oil outlet passage to the housing oil return passage, and the housing oil return passage can direct the lubricating oil to the left lubricating oil passage 32.
[0016] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that any modifications or equivalent replacements made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions shall be covered by the scope of the claims of the present invention.
Claims
1. A piston oil cooling and lubrication structure for a horizontal twin-cylinder motorcycle engine, comprising a crankcase body and a cylinder block mounted on one side of the crankcase body, wherein the crankcase body is formed by connecting a left crankcase and a right crankcase; characterized in that, There are two piston oil injectors arranged in the crankcase and facing the back of the piston. On the cylinder block mating surface of the crankcase, there are a left lubricating oil passage and a right lubricating oil passage. The left lubricating oil passage and the right lubricating oil passage are respectively arranged on the left crankcase and the right crankcase. One end of the right lubricating oil passage is communicated with the oil outlet passage in the right crankcase. There is a piston lubricating oil passage communicated with the oil inlet of the corresponding side piston oil injector on both the left lubricating oil passage and the right lubricating oil passage. On the cylinder block mating surface, there is a mating oil passage for communicating the left lubricating oil passage and the right lubricating oil passage. The left and right sides of the mating oil passage are respectively correspondingly mated with the left lubricating oil passage and the right lubricating oil passage. There is an oil passing passage leading to the cylinder head direction in the middle of the mating oil passage.
2. The piston oil cooling and lubrication structure of the horizontal double-cylinder motorcycle engine according to claim 1, characterized in that, The cross-sections of the mating oil passage, the left lubricating oil passage and the right lubricating oil passage are all semi-circular. The left lubricating oil passage and the right lubricating oil passage are arranged along the outer edge of the cylinder bore of the crankcase and are located on the left and right sides of the joint of the left crankcase and the right crankcase. There is a spacing between the left lubricating oil passage and the right lubricating oil passage.
3. The piston oil cooling and lubrication structure of the horizontal twin-cylinder motorcycle engine according to claim 1 or 2, characterized in that, The mating oil passage includes an oil inlet passage and a crankcase oil return passage. The oil inlet passage is correspondingly mated with the oil outlet passage of the right crankcase. The crankcase oil return passage is correspondingly mated with the left lubricating oil passage.