Crankcase of motorcycle engine

Abstract

The invention relates to a motorcycle engine crankcase which comprises a crankcase body, a front air cylinder, a rear air cylinder, a liquid inlet cavity, a liquid outlet cavity, an air cylinder water path, a first labyrinth, a second labyrinth and the like. The liquid inlet cavity and the liquid outlet cavity are integrally formed with the crankcase and integrated in the crankcase, so that the whole structure is compact, related pipeline installation is omitted, and the production cost is reduced. The front air cylinder and the rear air cylinder are arranged in a V shape to form an upward V-shaped opening, and the first labyrinth is arranged in the V-shaped opening to fill space, reduce rainwater accumulation and reduce corrosion to a crankcase. The thermostat cavity is arranged between the front cylinder and the rear cylinder, and a water outlet pipe is arranged at the top and communicated with the water tank to participate in engine major cycle. By arranging the first labyrinth and the second labyrinth, oil and gas are separated for the first time and the second time respectively, the oil-gas separation efficiency is improved, and the problems of insufficient mechanical lubrication and faults caused by reduction of engine oil are solved. The engine is compact in structure and reasonable in design, and the performance and reliability of the engine are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of motorcycles, and more specifically, it relates to a crankcase of a motorcycle engine. Background Art

[0002] When a motorcycle engine is working, it is necessary to set up a water circuit and an oil circuit to cool and lubricate the motorcycle engine. In the prior art, when arranging a motorcycle engine, many pipelines are usually arranged outside it to realize the functions of large cycle and small cycle of the motorcycle engine. The arrangement of the pipelines makes the external structure of the motorcycle engine complex and increases the production cost.

[0003] In addition, the motorcycle engine in the prior art uses an oil-gas separation structure to achieve oil-gas separation, resulting in limited separation effect of oil and air, making the oil easy to spray out, thus causing poor lubrication of the mechanical structure and prone to mechanical failures.

[0004] For example, Chinese Patent Publication No. CN102410103A, publication date April 11, 2012, invention name CN102410103A. This application discloses a crankcase structure of a motorcycle engine. When designed, no relevant pipelines are arranged inside the crankcase. Therefore, when installing, a variety of pipelines need to be connected outside it, making its external structure complex and increasing the production cost. Summary of the Invention

[0005] The present invention overcomes the following two deficiencies in the prior art: (1) The structure of the motorcycle engine is not compact, and more pipelines need to be arranged outside, increasing the production cost; (2) The oil-gas separation effect is poor, resulting in easy spraying of oil, reducing the oil quantity of the engine, and prone to mechanical failures. The present invention provides a crankcase of a motorcycle engine. By integrating the water circuit inside the crankcase, the number of external pipelines is reduced, and at the same time, the number of components is also reduced, reducing the manufacturing cost of the engine; in addition, without affecting the overall size and shape of the engine cavity, by setting two groups of oil-gas separation structures, the efficiency of oil-gas separation is improved, and the deficiency of mechanical failures caused by reduced oil is reduced.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions: A crankcase of a motorcycle engine, comprising: A crankcase, on which a front cylinder and a rear cylinder are provided; An inlet liquid cavity and an outlet liquid cavity are arranged on one side of the crankcase, and the inlet liquid cavity and the outlet liquid cavity are arranged between the front cylinder and the rear cylinder; Cylinder water circuits are arranged in both the front cylinder and the rear cylinder, and both ends of the cylinder water circuits are respectively communicated with the inlet liquid cavity and the outlet liquid cavity.

[0007] The liquid inlet chamber and the liquid outlet chamber are integrally formed with the crankcase. The liquid inlet chamber and the liquid outlet chamber are integrated within the crankcase, making the overall structure more compact, eliminating the installation of related pipelines, simplifying and compacting the overall layout of the engine, and reducing the overall production cost.

[0008] Preferably, a thermostat chamber communicating with the liquid outlet chamber is provided within the crankcase. The thermostat chamber is arranged between the front cylinder and the rear cylinder; a thermostat is provided within the thermostat chamber, and the thermostat controls the opening and closing of the water outlet of the liquid inlet chamber.

[0009] A thermostat is provided within the thermostat chamber, and the thermostat controls the opening and closing of the water outlet of the liquid inlet chamber. That is, the thermostat can control the outflow of the cooling water within the thermostat chamber. When the thermostat is opened, the cooling water within the thermostat can flow into the water tank through the outlet pipe and participate in the large cycle of the entire engine.

[0010] Preferably, a small circulation pipeline communicating with the thermostat chamber is provided within the crankcase. The thermostat controls the connection and closing of the small circulation pipeline and the thermostat chamber; a blocking section for determining whether to activate the small circulation function is provided within the small circulation pipeline.

[0011] A small circulation pipeline communicating with the thermostat chamber is provided within the crankcase. A blocking section that blocks the pipeline is provided within the pipeline, which can determine whether to use the small circulation function according to the performance requirements of the engine. When the small circulation function is required, the small circulation pipeline can be opened through machining, enabling the engine to have a small circulation structure, eliminating the production lines for different versions of motorcycle engines, and reducing the production cost of motorcycle engines.

[0012] Preferably, a first labyrinth is provided between the front cylinder and the rear cylinder, and a second labyrinth is provided at the inlet of the first labyrinth; the first labyrinth includes a labyrinth housing, and several oil and gas separation plates are provided within the labyrinth housing; a first inlet and a first outlet are provided within the first labyrinth, and the height of the bottom of the first labyrinth gradually decreases towards the direction of the first outlet.

[0013] In this application, the first labyrinth and the second labyrinth structures are provided. The first labyrinth structure and the second labyrinth structure respectively perform the first and second separations of the oil and gas, thereby improving the efficiency of oil and gas separation, avoiding problems such as oil reduction caused by oil spraying, and further preventing problems such as insufficient mechanical lubrication and mechanical failures. When the oil and gas flow within the first labyrinth structure, during the process of the oil and gas contacting the separation plates, the oil liquid and the air are separated. The oil liquid flows downward along the oil and gas separation plates to the bottom of the first labyrinth. Then, the oil liquid flows along the bottom plate of the first labyrinth towards the first outlet and finally returns to the bottom of the crankcase from the first outlet.

[0014] Preferably, a side cover is provided on the side of the crankcase away from the liquid inlet chamber and the liquid outlet chamber; the second labyrinth includes a first chamber provided on the crankcase and a second chamber provided in the side cover. The first chamber and the second chamber are separated by a side cover gasket, and a side cover sealing hole communicating the first chamber and the second chamber is provided on the side cover gasket.

[0015] The oil first enters the first chamber, then passes through the side cover gasket into the second chamber, and finally enters the first labyrinth from the second chamber. When the oil passes through the first chamber and the second chamber, the first oil-gas separation occurs, and the separated oil and gas then enter the second labyrinth for the second oil-gas separation.

[0016] Preferably, a second outlet communicating with the first inlet is provided in the second chamber, and the second chamber is inclined. A second hanging plate is provided at the top of the second chamber, and the bottom of the second hanging plate cooperates with the bottom of the second chamber to form a second flow channel.

[0017] After the oil and gas are separated in the first chamber and the second chamber, they can flow back into the crankcase along the side walls of the first chamber and the second chamber from the second inlet.

[0018] Preferably, liquid inlet and an oil cooler outlet communicating with the liquid inlet chamber are respectively provided at both ends of the liquid inlet chamber.

[0019] The liquid inlet is communicated with a water tank. The water in the water tank enters the liquid inlet chamber from the liquid inlet through a water pump. Then the water in the liquid inlet chamber is divided into two parts and flows. One part flows into the cylinder water passages of the front cylinder and the rear cylinder, and the other part of the cooling water flows out from the oil cooler outlet and flows into the oil cooler through an oil cooler water pipe to cool the engine oil in the oil cooler. Integrating the entire pipeline in the liquid inlet chamber thus saves the installation of a large number of pipelines and makes the overall structure more compact.

[0020] Preferably, the thermostat includes a mounting shell and a temperature sensing element provided in the mounting shell; the mounting shell includes an upper seat and a lower seat. One end of the temperature sensing element abuts against the upper seat, and the other end of the temperature sensing element passes through the lower seat and is connected with a lower valve plate; a first spring is sleeved outside the temperature sensing element. One end of the first spring abuts against the lower seat, and an upper valve plate is provided at the other end of the first spring. The first spring pushes the upper valve plate upward to block the inlet of the outlet pipe, thereby separating the outlet pipe from the thermostat chamber.

[0021] Through the above structural arrangement, the opening and closing of the large cycle and the small cycle of the engine can be automatically controlled.

[0022] Preferably, a lower abutting ring is provided at the bottom of the temperature sensing element, and a second spring is sleeved below the temperature sensing element. The second spring pushes the lower valve plate to abut against the lower abutting ring.

[0023] As the temperature sensing element elongates, when the lower valve plate abuts against the opening of the small circulation pipeline, the lower valve plate can slide on the temperature sensing element, thereby avoiding the problem that the lower valve plate abuts against the opening of the small circulation pipeline with excessive strength due to the over-elongation of the temperature sensing element.

[0024] Preferably, a sealing side cover is provided on the side of the crankcase away from the first labyrinth, and the sealing side cover and the crankcase cooperate to form a liquid inlet cavity and a liquid outlet cavity.

[0025] The setting of the sealing side cover facilitates the maintenance and cleaning of the liquid inlet cavity and the liquid outlet cavity.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows: In this application, the liquid inlet cavity and the liquid outlet cavity are integrally formed with the crankcase, and the liquid inlet cavity and the liquid outlet cavity are integrated in the crankcase, making the overall structure more compact, eliminating the installation of relevant pipelines, and making the overall layout of the engine more concise and compact, reducing the overall production cost; in addition, in this application, the first labyrinth and the second labyrinth structures are provided, and the first labyrinth structure and the second labyrinth structure respectively perform the first and second separations of the oil and gas, thereby improving the efficiency of oil and gas separation, avoiding problems such as oil reduction caused by oil spraying, and further preventing problems such as insufficient mechanical lubrication and mechanical failures.

[0027] A small circulation pipeline communicated with the thermostat cavity is provided in the crankcase, which can determine whether to use the small circulation function according to the performance requirements of the engine. When the small circulation function needs to be used, the small circulation pipeline can be opened by machining, enabling the engine to have a small circulation structure, eliminating the production line for manufacturing different versions of motorcycle engines, and reducing the production cost of motorcycle engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is the exploded structure diagram of the present invention.

[0029] Figure 2 is the three-dimensional structure diagram of the present invention.

[0030] Figure 3 is the front view of the crankcase of the present invention.

[0031] Figure 4 is Figure 3 the cross-sectional view taken along the A-A direction in

[0032] Figure 5 is Figure 4 the partial enlarged view of

[0033] Figure 6 is the three-dimensional structure diagram of the sealing side cover of the present invention.

[0034] Figure 7It is a three-dimensional structure diagram of the thermostat of the present invention.

[0035] Figure 8 It is a cross-sectional view of the thermostat of the present invention.

[0036] Figure 9 It is a front view of the crankcase of the present invention from another angle.

[0037] Figure 10 It is a three-dimensional structure diagram when the side cover and the side cover gasket of the present invention are matched.

[0038] Figure 11 It is a three-dimensional structure diagram of the side cover of the present invention from another angle.

[0039] Figure 12 It is a schematic structural diagram of the side cover gasket of the present invention.

[0040] In the figure: crankcase 1, front cylinder 11, rear cylinder 12, liquid inlet cavity 13, liquid inlet 131, oil cooling outlet 132, liquid outlet cavity 14, cylinder water passage 15, thermostat cavity 16, water outlet pipe 17, small circulation pipeline 18, blocking section 181, side cover 19; First labyrinth 2, labyrinth housing 21, first horizontal separation plate 221, second horizontal separation plate 222, third horizontal separation plate 223, first vertical separation plate 231, second vertical separation plate 232, first flow groove 241, second flow groove 242, first inlet 25, first outlet 26; Second labyrinth 3, first chamber 31, second inlet 311, first hanging plate 312, second chamber 32, second outlet 321, second hanging plate 322, side cover gasket 33, side cover sealing hole 331; Thermostat 4, temperature sensing element 41, upper abutting ring 411, lower abutting ring 412, upper seat 42, lower seat 43, connecting strip 44, lower valve plate 45, first spring 46, upper valve plate 47, second spring 48; Sealing side cover 5, sealing groove 51, sealing strip 52. Detailed implementation manners

[0041] The following will further specifically describe the technical solutions of the present invention through specific embodiments in conjunction with the drawings: Embodiment 1: Refer to Figures 1 to 12 As shown, a motorcycle engine crankcase includes: Crankcase 1, on which a front cylinder 11 and a rear cylinder 12 are provided; A liquid inlet cavity 13 and a liquid outlet cavity 14 are provided on one side of the crankcase 1, and the liquid inlet cavity 13 and the liquid outlet cavity 14 are provided between the front cylinder 11 and the rear cylinder 12; Both the front cylinder 11 and the rear cylinder 12 are provided with a cylinder water passage 15, and both ends of the cylinder water passage 15 communicate with the liquid inlet cavity 13 and the liquid outlet cavity 14 respectively.

[0042] The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrally formed with the crankcase 1. The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrated in the crankcase 1, making the overall structure more compact, eliminating the installation of related pipelines, simplifying and compacting the overall layout of the engine, and reducing the overall production cost.

[0043] Embodiment 2: Refer to Figures 1 to 12 As shown, a motorcycle engine crankcase includes: A crankcase 1, on which a front cylinder 11 and a rear cylinder 12 are provided; A liquid inlet cavity 13 and a liquid outlet cavity 14 are provided on one side of the crankcase 1, and the liquid inlet cavity 13 and the liquid outlet cavity 14 are arranged between the front cylinder 11 and the rear cylinder 12; Both the front cylinder 11 and the rear cylinder 12 are provided with a cylinder water passage 15, and both ends of the cylinder water passage 15 communicate with the liquid inlet cavity 13 and the liquid outlet cavity 14 respectively; A first labyrinth 2 arranged between the front cylinder 11 and the rear cylinder 12, and a second labyrinth 3 arranged at the inlet of the first labyrinth 2.

[0044] The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrally formed with the crankcase 1. The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrated in the crankcase 1, making the overall structure more compact, eliminating the installation of related pipelines, simplifying and compacting the overall layout of the engine, and reducing the overall production cost; in addition, in this application, the first labyrinth 2 and the second labyrinth 3 are provided. The first labyrinth 2 structure and the second labyrinth 3 structure respectively perform the first and second separations of the oil and gas, thereby improving the efficiency of oil and gas separation, avoiding problems such as oil reduction caused by oil spraying, and further preventing problems such as insufficient mechanical lubrication and mechanical failures.

[0045] The front cylinder 11 and the rear cylinder 12 are arranged in a V shape, thereby forming a V-shaped opening with an upward opening between the front cylinder 11 and the rear cylinder 12. The first labyrinth 2 is arranged in the V-shaped opening. The first labyrinth 2 arranged in the V-shaped opening can fill the space in the V-shaped opening, not only making the overall space structure more reasonable and compact, effectively utilizing the space in the V-shaped opening, but also filling the space in the V-shaped opening, reducing the accumulation of rainwater in the V-shaped space, and reducing the erosion of the crankcase 1 by rainwater.

[0046] In one embodiment, a thermostat chamber 16 communicating with the liquid outlet chamber 14 is provided in the crankcase 1. The thermostat chamber 16 is arranged between the front cylinder 11 and the rear cylinder 12. An outlet water pipe 17 is provided at the top of the thermostat chamber 16. The water in the thermostat chamber 16 flows back into the water tank from the upper outlet water pipe 17. Moreover, the thermostat chamber 16 is also arranged within the V-shaped opening to fill the space within the V-shaped opening, reducing the accumulation of rainwater within the V-shaped space and reducing the erosion of the crankcase 1 by rainwater.

[0047] A thermostat 4 is provided in the thermostat chamber 16. The thermostat 4 controls the opening and closing of the water outlet of the liquid inlet chamber 13. That is, the thermostat 4 can control the outflow of the cooling water within the thermostat chamber 16. When the thermostat 4 is opened, the cooling water within the thermostat 4 can flow into the water tank from the outlet water pipe 17 and participate in the large cycle of the entire engine.

[0048] The two structures of the liquid inlet chamber 13 and the liquid outlet chamber 14 are in an arc shape. At both ends in the length direction of the liquid inlet chamber 13, they respectively correspond to the positions of the front cylinder 11 and the rear cylinder 12. And both ends of the liquid inlet chamber 13 are respectively communicated with the cylinder water passages 15 of the front cylinder 11 and the rear cylinder 12. The cooling water enters the cylinder water passages 15 of the front cylinder 11 and the rear cylinder 12 respectively from both ends of the liquid inlet chamber 13. When the cooling water passes through the cylinder water passage 15, it cools and dissipates heat from the cylinder, and then flows into the thermostat chamber 16 and the liquid outlet chamber 14 from the cooling water passage 15, and finally flows into the water tank through the outlet water pipe 17.

[0049] Liquid inlet inlets 131 and oil cooler outlets 132 communicating with it are respectively provided at both ends of the liquid inlet chamber 13. The liquid inlet inlet 131 is communicated with the water tank. The water in the water tank enters the liquid inlet chamber 13 from the liquid inlet inlet 131 through a water pump. Then, the water within the liquid inlet chamber 13 flows in two parts. One part flows into the cylinder water passages 15 of the front cylinder 11 and the rear cylinder 12, and the other part of the cooling water flows out from the oil cooler outlet 132 and flows into the oil cooler through an oil cooling water pipe to cool the engine oil within the oil cooler.

[0050] A sealing side cover 5 is provided on one side of the crankcase 1 away from the first labyrinth 2. The sealing side cover 5 and the crankcase 1 cooperate to form the liquid inlet chamber 13 and the liquid outlet chamber 14. The sealing side cover 5 is fixedly installed on the crankcase 1 through bolts. A sealing groove 51 is further provided on the end face of the sealing side cover 5. A sealing strip 52 is provided within the sealing groove 51. The setting of the sealing strip 52 can increase the sealing performance between the sealing side cover 5 and the crankcase 1.

[0051] In one embodiment, a small circulation pipeline 18 communicating with the thermostat chamber 16 is provided in the crankcase 1. The thermostat 4 controls the communication and closing of the small circulation pipeline 18 and the thermostat chamber 16. A blocking section 181 for determining whether to activate the small circulation function is provided within the small circulation pipeline 18. The small circulation pipeline 18 is arranged at the bottom of the liquid inlet chamber 13 and the liquid outlet chamber 14.

[0052] A small circulation pipeline 18 communicating with the thermostat chamber 16 is provided in the crankcase 1. A blocking section 181 for blocking the pipeline 18 is provided in the pipeline 18, and it is possible to determine whether to use the small circulation function according to the performance requirements of the engine. When the small circulation function needs to be used, the small circulation pipeline 18 can be drilled through by machining, so that the engine has a small circulation structure, saving the production line for manufacturing motorcycle engines of different versions and reducing the production cost of motorcycle engines.

[0053] Refer to Figure 7 and Figure 8 As shown, the thermostat 4 includes a mounting shell and a temperature sensing element 41 arranged inside the mounting shell; the mounting shell is mounted in the thermostat chamber 16. The mounting shell includes an upper seat 42 and a lower seat 43, and the upper seat 42 and the lower seat 43 are connected by a plurality of connecting bars 44; a plurality of water passing holes 421 are provided on the side wall of the upper seat 42 to facilitate the flow of cooling water between the thermostat chamber 16 and the water outlet pipe 17. The temperature sensing element 41 is in a long strip shape. When the temperature rises, the temperature sensing element 41 can gradually elongate as the temperature rises, and when the temperature drops, the length also gradually shortens. One end of the temperature sensing element 41 abuts against the upper seat 42, and the other end of the temperature sensing element 41 passes through the lower seat 43 to connect to the lower valve plate 45; a first spring 46 is sleeved outside the temperature sensing element 41. One end of the first spring 46 abuts against the lower seat 43, and an upper valve plate 47 is provided at the other end of the first spring 46. The first spring 46 pushes the upper valve plate 47 upward to block the inlet of the water outlet pipe 17, separating the water outlet pipe 17 from the thermostat chamber 16.

[0054] Specifically, an upper abutting ring 411 is provided on the outer side wall of the upper end of the temperature sensing element 41. The inner ring and the outer ring of the upper valve plate 47 abut against the circumferential direction of the upper abutting ring 411 and the upper seat 42 respectively, blocking the gap between the temperature sensing element 41 and the upper seat 42, thereby separating the water outlet pipe 17 from the thermostat chamber 16 and preventing the cooling water from discharging outward from the water outlet pipe 17.

[0055] In the state where the engine temperature is relatively low, the first spring 46 pushes the upper valve plate 47 to block the gap between the temperature sensing element 41 and the upper seat 42, preventing the cooling water from discharging outward from the water outlet pipe 17. And at this time, the lower valve plate 45 is separated from the small circulation pipeline 18, and the cooling water can flow smoothly in the small circulation pipeline 18, and the small circulation pipeline 18 can smoothly perform the small circulation of the engine.

[0056] As the engine temperature rises, the temperature of the cooling water also gradually increases, causing the temperature-sensitive element 41 to elongate. As a result, the upper abutting ring 411 can overcome the force of the first spring 46 and push the upper valve plate 47 to move, causing the upper valve plate 47 to separate from the upper seat 42. The cooling water enters the outlet pipe 17 through the thermostat chamber 16, and the water in the outlet pipe 17 finally flows into the water tank for large circulation. At the same time, the elongated temperature-sensitive element 41 pushes the lower valve plate 45 to abut against the opening of the small circulation pipe 18, blocking the small circulation pipe 18 and stopping the small circulation of the engine. That is to say, through the above structure, the opening and closing of the large circulation and small circulation of the engine can be automatically controlled.

[0057] In one embodiment, a lower abutting ring 412 is provided at the bottom of the temperature-sensitive element 41, and a second spring 48 is sleeved below the temperature-sensitive element 41. The second spring 48 pushes the lower valve plate 45 to abut against the lower abutting ring 412. As the temperature-sensitive element 41 elongates, when the lower valve plate 45 abuts against the opening of the small circulation pipe 18, the lower valve plate 45 can slide on the temperature-sensitive element 41, thus avoiding the problem that the strength of the lower valve plate 45 abutting against the opening of the small circulation pipe 18 is too large due to the excessive elongation of the temperature-sensitive element 41.

[0058] In this application, the liquid inlet chamber 13 and the liquid outlet chamber 14 are integrally formed with the crankcase 1. The liquid inlet chamber 13 and the liquid outlet chamber 14 are integrated in the crankcase 1, making the overall structure more compact, eliminating the installation of relevant pipelines, making the overall layout of the engine more concise and compact, and reducing the overall production cost. In addition, in this application, the first labyrinth 2 and the second labyrinth 3 structures are provided. The first labyrinth 2 structure and the second labyrinth 3 structure respectively perform the first and second separations of the oil and gas, thereby improving the efficiency of oil and gas separation and avoiding problems such as oil reduction caused by oil spraying, which may further lead to problems such as insufficient mechanical lubrication and mechanical failures.

[0059] In addition, a small circulation pipe 18 communicating with the thermostat chamber 16 is provided in the crankcase 1, and whether to use the small circulation function can be determined according to the performance requirements of the engine. When the small circulation function needs to be used, the small circulation pipe 18 can be opened by machining, enabling the engine to have a small circulation structure, eliminating the production line for manufacturing different versions of motorcycle engines, and reducing the production cost of motorcycle engines.

[0060] Embodiment 3: Refer to Figures 1 to 12 As shown, a motorcycle engine crankcase includes: A crankcase 1, on which a front cylinder 11 and a rear cylinder 12 are provided; A liquid inlet chamber 13 and a liquid outlet chamber 14 are provided on one side of the crankcase 1, and the liquid inlet chamber 13 and the liquid outlet chamber 14 are provided between the front cylinder 11 and the rear cylinder 12; Both the front cylinder 11 and the rear cylinder 12 are provided with a cylinder water passage 15, and both ends of the cylinder water passage 15 are respectively communicated with the liquid inlet cavity 13 and the liquid outlet cavity 14; The first labyrinth 2 provided between the front cylinder 11 and the rear cylinder 12, and the second labyrinth 3 provided at the inlet of the first labyrinth 2.

[0061] The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrally formed with the crankcase 1. The liquid inlet cavity 13 and the liquid outlet cavity 14 are integrated in the crankcase 1, making the overall structure more compact, eliminating the installation of related pipelines, making the overall layout of the engine more concise and compact, and reducing the overall production cost. In addition, in this application, the first labyrinth 2 and the second labyrinth 3 are provided. The first labyrinth 2 structure and the second labyrinth 3 structure respectively separate the oil and gas for the first and second times, thereby improving the efficiency of oil and gas separation, avoiding problems such as oil reduction caused by oil spraying, and further causing problems such as insufficient mechanical lubrication and mechanical failures.

[0062] The front cylinder 11 and the rear cylinder 12 are arranged in a V shape, thereby forming a V-shaped opening with an upward opening between the front cylinder 11 and the rear cylinder 12. The first labyrinth 2 is arranged in the V-shaped opening. The first labyrinth 2 arranged in the V-shaped opening can fill the space in the V-shaped opening, not only making the overall space structure more reasonable and compact, effectively utilizing the space in the V-shaped opening, but also filling the space in the V-shaped opening, reducing the accumulation of rainwater in the V-shaped space, and reducing the erosion of the crankcase 1 by rainwater.

[0063] In one embodiment, a thermostat chamber 16 communicated with the liquid outlet cavity 14 is arranged in the crankcase 1. The thermostat chamber 16 is arranged between the front cylinder 11 and the rear cylinder 12. A water outlet pipe 17 is arranged at the top of the thermostat chamber 16. The water in the thermostat chamber 16 flows back into the water tank from the upper water outlet pipe 17, and the thermostat chamber 16 is also arranged in the V-shaped opening, filling the space in the V-shaped opening, reducing the accumulation of rainwater in the V-shaped space, and reducing the erosion of the crankcase 1 by rainwater.

[0064] A thermostat 4 is arranged in the thermostat chamber 16, and the thermostat 4 controls the opening and closing of the water outlet of the liquid inlet cavity 13. That is, the thermostat 4 can control the outflow of the cooling water in the thermostat chamber 16. When the thermostat 4 is opened, the cooling water in the thermostat 4 can flow into the water tank from the water outlet pipe 17 and participate in the large cycle of the entire engine.

[0065] The two structures of the liquid inlet chamber 13 and the liquid outlet chamber 14 are arc-shaped. At both ends in the length direction of the liquid inlet chamber 13, they respectively correspond to the positions of the front cylinder 11 and the rear cylinder 12, and both ends of the liquid inlet chamber 13 are respectively communicated with the cylinder water channels 15 of the front cylinder 11 and the rear cylinder 12. Cooling water enters the cylinder water channels 15 of the front cylinder 11 and the rear cylinder 12 from both ends of the liquid inlet chamber 13 respectively. When the cooling water passes through the cylinder water channels 15, it cools and dissipates heat from the cylinders, and then flows into the thermostat chamber 16 and the liquid outlet chamber 14 through the cooling water channels 15, and finally flows into the water tank through the water outlet pipe 17.

[0066] At both ends of the liquid inlet chamber 13, there are respectively provided a liquid inlet 131 and an oil cooling outlet 132 communicated therewith. The liquid inlet 131 is communicated with the water tank. Water in the water tank enters the liquid inlet chamber 13 through a water pump from the liquid inlet 131. Then, the water in the liquid inlet chamber 13 flows in two parts. One part flows into the cylinder water channels 15 of the front cylinder 11 and the rear cylinder 12, and the other part of the cooling water flows out from the oil cooling outlet 132 and flows into the oil cooler through an oil cooling water pipe to cool the engine oil in the oil cooler.

[0067] On one side of the crankcase 1 away from the first labyrinth 2, there is provided a sealing side cover 5. The sealing side cover 5 and the crankcase 1 cooperate to form the liquid inlet chamber 13 and the liquid outlet chamber 14. The sealing side cover 5 is fixedly installed on the crankcase 1 by bolts. On the end face of the sealing side cover 5, there is also provided a sealing groove 51, and a sealing strip 52 is arranged in the sealing groove 51. The arrangement of the sealing strip 52 can increase the sealing performance between the sealing side cover 5 and the crankcase 1.

[0068] In one embodiment, a small circulation pipeline 18 communicated with the thermostat chamber 16 is arranged in the crankcase 1. The thermostat 4 controls the communication and closing of the small circulation pipeline 18 and the thermostat chamber 16; a blocking section 181 for determining whether to turn on the small circulation function is arranged in the small circulation pipeline 18. The small circulation pipeline 18 is arranged at the bottom of the liquid inlet chamber 13 and the liquid outlet chamber 14.

[0069] In the crankcase 1, there is arranged a small circulation pipeline 18 communicated with the thermostat chamber 16. A blocking section 181 for blocking it is arranged in the pipeline 18, which can determine whether to use the small circulation function according to the performance requirements of the engine. When the small circulation function needs to be used, the small circulation pipeline 18 can be opened by machining, so that the engine has a small circulation structure, saving the production line for different versions of motorcycle engines and reducing the production cost of motorcycle engines.

[0070] Refer to Figure 7 and Figure 8As shown in the figure, the thermostat 4 includes a mounting shell and a temperature sensing element 41 disposed within the mounting shell; the mounting shell is installed within the thermostat chamber 16. The mounting shell includes an upper seat 42 and a lower seat 43, which are connected by a plurality of connecting bars 44; a plurality of water passing holes 421 are provided on the side wall of the upper seat 42 to facilitate the flow of cooling water between the thermostat chamber 16 and the outlet pipe 17. The temperature sensing element 41 is in a strip shape. When the temperature rises, the temperature sensing element 41 can gradually elongate as the temperature increases, and when the temperature drops, the length also gradually shortens. One end of the temperature sensing element 41 abuts against the upper seat 42, and the other end of the temperature sensing element 41 passes through the lower seat 43 to connect to the lower valve plate 45; a first spring 46 is sleeved outside the temperature sensing element 41. One end of the first spring 46 abuts against the lower seat 43, and an upper valve plate 47 is provided at the other end of the first spring 46. The first spring 46 pushes the upper valve plate 47 upward to block the inlet of the outlet pipe 17, separating the outlet pipe 17 from the thermostat chamber 16.

[0071] Specifically, an upper abutting ring 411 is provided on the outer side wall of the upper end of the temperature sensing element 41. The inner ring and the outer ring of the upper valve plate 47 respectively abut against the circumferential direction of the upper abutting ring 411 and the upper seat 42 to block the gap between the temperature sensing element 41 and the upper seat 42, thereby separating the outlet pipe 17 from the thermostat chamber 16 and preventing the cooling water from discharging outward from the outlet pipe 17.

[0072] In a state where the engine temperature is relatively low, the first spring 46 pushes the upper valve plate 47 to block the gap between the temperature sensing element 41 and the upper seat 42, preventing the cooling water from discharging outward from the outlet pipe 17. And at this time, the lower valve plate 45 is separated from the small circulation pipeline 18, and the cooling water can flow smoothly within the small circulation pipeline 18, and the small circulation pipeline 18 can smoothly perform the small circulation of the engine.

[0073] As the engine temperature rises, the temperature of the cooling water also gradually increases, causing the temperature sensing element 41 to elongate, enabling the upper abutting ring 411 to overcome the acting force of the first spring 46 and push the upper valve plate 47 to move, causing the upper valve plate 47 to separate from the upper seat 42. The cooling water enters the outlet pipe 17 through the thermostat chamber 16, and the water in the outlet pipe 17 finally flows into the water tank for large circulation. At the same time, the elongated temperature sensing element 41 pushes the lower valve plate 45 to abut against the opening of the small circulation pipeline 18 to block the small circulation pipeline 18, causing the engine to stop the small circulation. That is to say, through the above structure, the opening and closing of the large circulation and small circulation of the engine can be automatically controlled.

[0074] In one embodiment, a lower abutting ring 412 is provided at the bottom of the temperature sensing element 41, and a second spring 48 is sleeved below the temperature sensing element 41. The second spring 48 pushes the lower valve plate 45 to abut against the lower abutting ring 412. As the temperature sensing element 41 elongates, when the lower valve plate 45 abuts against the opening of the small circulation pipeline 18, the lower valve plate 45 can slide on the temperature sensing element 41, thereby avoiding the problem that the strength of the lower valve plate 45 abutting against the opening of the small circulation pipeline 18 is too large due to the excessive elongation of the temperature sensing element 41.

[0075] The difference in structure between this embodiment and Embodiment 2 is that the first labyrinth 2 includes a labyrinth housing 21, and a plurality of separation plates are arranged in the labyrinth housing 21; the plurality of separation plates include a first horizontal separation plate 221, a second horizontal separation plate 222, and a third horizontal separation plate 223 arranged in parallel in sequence, and also include a first longitudinal separation plate 231 and a second longitudinal separation plate 232. The first longitudinal separation plate 231 is arranged between the first horizontal separation plate 221 and the second horizontal separation plate 222, and a first flow groove 241 and a second flow groove 242 are respectively arranged at both ends in the length direction of the first longitudinal separation plate 231.

[0076] A first inlet 25 and a first outlet 26 are arranged in the first labyrinth 2, and the height of the bottom of the first labyrinth 2 gradually decreases in the direction of the first outlet 26.

[0077] When the oil and gas flow in the structure of the first labyrinth 2, during the process of the oil and gas contacting the separation plate, the oil and gas will separate the oil liquid from the air, and the oil liquid flows downward along the oil and gas separation plate to the bottom of the first labyrinth 2. Then the oil liquid flows along the bottom plate of the first labyrinth 2 towards the first outlet 26, and finally returns to the bottom of the crankcase 1 from the first outlet 26.

[0078] A side cover 19 is arranged on one side of the crankcase 1 away from the liquid inlet chamber 13 and the liquid outlet chamber 14; the second labyrinth 3 includes a first chamber 31 arranged on the crankcase 1 and a second chamber 32 arranged in the side cover 19. The first chamber 31 and the second chamber 32 are separated by a side cover gasket 33, and a side cover sealing hole 331 communicating the first chamber 31 and the second chamber 32 is arranged on the side cover gasket 33.

[0079] The oil liquid first enters the first chamber 31, then passes through the side cover gasket 33 to enter the second chamber 32, and finally enters the first labyrinth 2 from the second chamber 32. When the oil liquid passes through the first chamber 31 and the second chamber 32, the first oil and gas separation is carried out, and the separated oil and gas then enter the second labyrinth 3 for the second oil and gas separation.

[0080] A second outlet 321 communicating with the first inlet 25 is provided in the second chamber 32. The second chamber 32 is inclined, and a second hanging plate 322 is provided at the top of the second chamber 32. The bottom of the second hanging plate 322 and the bottom of the side wall of the second chamber 32 cooperate to form a second flow channel 323. A second inlet 311 is provided in the first chamber 31. Oil and gas enter the first chamber 31 from the second inlet 311 and then pass through the side cover sealing hole 331 into the second chamber 32.

[0081] There is an included angle between the second inlet 311 and the side cover sealing hole 331. The included angle between the second inlet 311 and the side cover sealing hole 331 in this application is 90 degrees, so as to prevent oil from splashing into the side cover sealing hole 331.

[0082] The shapes and arranged positions of the first chamber 31 and the second chamber 32 are the same, and both are inclined. The position of the second inlet 311 is at the low end, while the position of the second outlet 321 is at the high end, that is, the height of the second outlet 321 is higher than the height of the second inlet 311. After the oil and gas are separated in the first chamber 31 and the second chamber 32, they can flow along the side walls of the first chamber 31 and the second chamber 32 and return to the crankcase 1 from the second inlet 311.

[0083] In addition, a first hanging plate 312 is also provided in the first chamber 31. The first hanging plate 312 can also play a role in blocking oil and gas. At the same time, the first chamber 31 is hollow, reducing the weight of the side cover 19.

[0084] Therefore, in this application, by setting the first labyrinth 2 and the second labyrinth 3, the separation efficiency of oil and gas can be improved, and it does not affect the size of the entire crankcase 1, and the overall structure is more compact.

[0085] In this application, the liquid inlet chamber 13 and the liquid outlet chamber 14 are integrally formed with the crankcase 1. The liquid inlet chamber 13 and the liquid outlet chamber 14 are integrated in the crankcase 1, making the overall structure more compact, eliminating the installation of relevant pipelines, and making the overall layout of the engine more concise and compact, reducing the overall production cost. In addition, in this application, the first labyrinth 2 and the second labyrinth 3 structures are set. The first labyrinth 2 structure and the second labyrinth 3 structure separately perform the first and second separations of oil and gas, so as to improve the separation efficiency of oil and gas, avoid problems such as oil reduction caused by oil spraying, and further cause problems such as insufficient mechanical lubrication and mechanical failures.

[0086] In addition, a small circulation pipeline 18 communicating with the thermostat chamber 16 is provided in the crankcase 1, which can determine whether to use the small circulation function according to the performance requirements of the engine. When the small circulation function needs to be used, the small circulation pipeline 18 can be opened by machining, so that the engine has a small circulation structure, eliminating the production line for manufacturing different versions of motorcycle engines and reducing the production cost of motorcycle engines.

[0087] The above-described embodiments are only preferred solutions of the present invention and do not impose any formal restrictions on the present invention. There are other variations and modifications without exceeding the technical solutions recited in the claims.

Claims

1. A motorcycle engine crankcase, characterized in that, Comprising: A crankcase, on which a front cylinder and a rear cylinder are provided; A liquid inlet chamber and a liquid outlet chamber are provided on one side of the crankcase, and the liquid inlet chamber and the liquid outlet chamber are arranged between the front cylinder and the rear cylinder; Cylinder waterways are provided in both the front cylinder and the rear cylinder, and both ends of the cylinder waterways are respectively communicated with the liquid inlet chamber and the liquid outlet chamber.

2. The motorcycle engine crankcase according to claim 1, characterized in that, in A thermostat chamber communicated with the liquid outlet chamber is provided in the crankcase, and the thermostat chamber is arranged between the front cylinder and the rear cylinder; a thermostat is provided in the thermostat chamber, and the thermostat controls the opening and closing of the water outlet of the liquid inlet chamber.

3. The motorcycle engine crankcase according to claim 2, characterized in that, in A small circulation pipeline communicated with the thermostat chamber is provided in the crankcase, and the thermostat controls the connection and closing of the small circulation pipeline and the thermostat chamber; a blocking section for determining whether to turn on the small circulation function is provided in the small circulation pipeline.

4. The motorcycle engine crankcase according to claim 1, characterized in that, A first labyrinth is provided between the front cylinder and the rear cylinder, and a second labyrinth is provided at the inlet of the first labyrinth; the first labyrinth includes a labyrinth shell, and a plurality of oil-gas separation plates are provided in the labyrinth shell; a first inlet and a first outlet are provided in the first labyrinth, and the height of the bottom of the first labyrinth gradually decreases towards the direction of the first outlet.

5. The motorcycle engine crankcase according to claim 4, characterized in that, A side cover is provided on the side of the crankcase away from the liquid inlet chamber and the liquid outlet chamber; the second labyrinth includes a first chamber provided on the crankcase and a second chamber provided in the side cover, and the first chamber and the second chamber are separated by a side cover gasket, and a side cover sealing hole communicating the first chamber and the second chamber is provided on the side cover gasket.

6. The motorcycle engine crankcase according to claim 5, characterized in that, A second outlet communicated with the first inlet is provided in the second chamber, and the second chamber is inclined, a second hanging plate is provided at the top of the second chamber, and the bottom of the second hanging plate and the bottom of the second chamber cooperate to form a second flow channel.

7. The motorcycle engine crankcase according to any one of claims 1 to 6, characterized in that, Liquid inlet and an oil cooler outlet communicated with the liquid inlet chamber are respectively provided at both ends of the liquid inlet chamber.

8. The motorcycle engine crankcase according to claim 2 or 3, characterized in that, The thermostat includes a mounting shell and a temperature sensing element provided in the mounting shell; the mounting shell includes an upper seat and a lower seat, one end of the temperature sensing element abuts against the upper seat, the other end of the temperature sensing element passes through the lower seat and is connected with a lower valve plate; a first spring is sleeved outside the temperature sensing element, one end of the first spring abuts against the lower seat, and an upper valve plate is provided at the other end of the first spring, and the first spring pushes the upper valve plate to move upwards to block the inlet of the water outlet pipe, so as to separate the water outlet pipe from the thermostat chamber.

9. The motorcycle engine crankcase according to claim 8, characterized in that, A lower abutting ring is provided at the bottom of the temperature sensing element, and a second spring is sleeved below the temperature sensing element, and the second spring pushes the lower valve plate to abut against the lower abutting ring.

10. The motorcycle engine crankcase according to any one of claims 1 to 6, characterized in that, A sealed side cover is provided on the side of the crankcase away from the first labyrinth, and the sealed side cover and the crankcase cooperate to form a liquid inlet chamber and a liquid outlet chamber.

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