Motorcycle engine with small circulating pipe arrangement structure

Abstract

The utility model discloses a motorcycle engine with a small circulating pipe arrangement structure, and aims to overcome the defect that in the prior art, at least two sets of motorcycle engine structures with different structures need to be produced in the manufacturing process to adapt to motorcycles of different versions, and the manufacturing cost of the motorcycle engine is increased. The technical problem is solved through the following technical scheme that the crank case comprises a crank case, a liquid inlet cavity and a liquid return cavity are formed in the crank case, an installation cavity communicated with the liquid return cavity is further formed in the crank case, one end of the installation cavity is communicated with a water outlet pipe, and the other end of the installation cavity is communicated with a small circulation end pipe; a thermostat is arranged in the mounting cavity and controls communication among the small circulation end pipe, the water outlet pipe and the mounting cavity; and a plugging section is arranged in the small circulation end pipe.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of motorcycle, more specifically, it relates to a motorcycle engine with small circulation pipe arrangement structure. BACKGROUND

[0002] The small circulation structure of the motorcycle engine controls the flow direction of the coolant through the thermostat, ensuring that the engine can quickly warm up during cold start, reducing wear and tear and improving fuel economy. When the engine reaches the optimal working temperature, the system will automatically switch to the large circulation mode to ensure continuous high-efficiency heat dissipation effect.

[0003] In order to meet market demand, motorcycles are usually provided with low and high versions, and high version motorcycles are provided with high version engines, and low version motorcycles are provided with low version engines. Small circulation structure is usually provided in high version motorcycle engine, while low version motorcycle engine does not have small circulation structure, which requires production of at least two sets of motorcycle engine structures with different structures to adapt to different versions of motorcycles during manufacturing, increasing the manufacturing cost of motorcycle engine.

[0004] For example, Chinese patent No. CN213980972U, published on August 17, 2021, the name of the invention is a motorcycle engine built-in small circulation waterway cylinder head, the above application discloses a cylinder head provided with a small circulation waterway, which can make the engine have small circulation function. When the low version motorcycle does not need to use the small circulation waterway, other structure of motorcycle engine needs to be designed to replace it. UTILITY MODEL CONTENTS

[0005] The utility model overcomes the deficiency that at least two sets of motorcycle engine structures with different structures need to be produced to adapt to different versions of motorcycles during manufacturing, increasing the manufacturing cost of motorcycle engine, provides a motorcycle engine with small circulation pipe arrangement structure, which reserves a small circulation pipe interface and can determine whether to use small circulation function according to performance requirements. When small circulation function is needed, the small circulation interface can be drilled through by machining, so that the engine has small circulation structure, eliminating the assembly line for producing different versions of motorcycle engine and reducing the production cost of motorcycle engine.

[0006] In order to solve the above technical problems, the utility model adopts the following technical scheme: a motorcycle engine with small circulation pipe arrangement structure, comprising: a crankcase, an inlet chamber and a return chamber are provided on the crankcase, an installation chamber is further provided in the crankcase and communicates with the return chamber, one end of the installation chamber communicates with the water outlet pipe, and the other end of the installation chamber communicates with the small circulation end pipe;

[0007] A thermostat is arranged in the mounting cavity, and the thermostat controls the communication between the small circulation end pipe, the water outlet pipe and the mounting cavity.

[0008] In the present application, a small circulation end pipe is arranged in the mounting cavity of the thermostat, and a blocking section is arranged in the end pipe to block the end pipe, and whether the small circulation function is used can be determined according to the performance requirement of the engine, and when the small circulation function is needed, the small circulation end pipe can be opened by machining, so that the engine has a small circulation structure, and the production line for producing different versions of motorcycle engines is omitted, and the production cost of the motorcycle engine is reduced.

[0009] As a preferred, a first cylinder and a second cylinder are arranged on the crankcase, and the first cylinder and the second cylinder are both provided with cooling pipes, and the cooling liquid enters the cooling pipes from the liquid inlet cavity and then flows out from the liquid outlet cavity.

[0010] The first cylinder and the second cylinder are both provided with cooling pipes, and the cooling liquid enters the cooling pipes from the liquid inlet cavity and then flows out from the liquid outlet cavity. Specifically, the cooling inlets are arranged at both ends of the liquid inlet cavity and communicate with the cooling pipes of the first cylinder and the second cylinder, and the cooling outlets are arranged at both ends of the liquid return cavity and communicate with the cooling pipes of the first cylinder and the second cylinder, and the cooling liquid in the liquid return cavity enters the cooling pipes of the first cylinder and the second cylinder from the cooling inlets, and then flows into the liquid return cavity from the cooling outlets.

[0011] As a preferred, the water inlet pipe is arranged at one end of the liquid inlet cavity, and the oil cooler water outlet pipe is arranged at the other end of the liquid inlet cavity.

[0012] The water inlet pipe communicates with the water tank, and the water in the water tank is pumped into the liquid inlet cavity by the water pump, and the water in the liquid inlet cavity is divided into two paths, one path enters the cooling pipes of the first cylinder and the second cylinder to cool the liquid inlet cavity, and the other path passes through the oil cooler water outlet pipe to cool the oil cooler.

[0013] As a preferred, the cavity end cover is arranged on the crankcase, and the cavity end cover cooperates with the crankcase to form the liquid inlet cavity and the liquid return cavity.

[0014] The liquid inlet cavity and the liquid return cavity in the present embodiment are integrally formed with the crankcase, so that the liquid inlet cavity and the liquid return cavity are integrated on the crankcase, which not only reduces the arrangement of the engine related pipelines, makes the overall structure of the engine more compact, reduces the cost, but also improves the cooling efficiency of the liquid inlet cavity and the liquid return cavity on the engine.

[0015] As a preferred, the edge of the cavity end cover is provided with an end surface groove distributed along the end surface thereof, and the end surface seal strip is arranged in the end surface groove and cooperates with the end surface groove.

[0016] The end face sealing strip is made of rubber material, and can abut tightly between the cavity end cover and the crankcase, thereby improving the sealing performance between the cavity end cover and the crankcase, and preventing the cooling liquid from leaking from the gap between the cavity end cover and the crankcase.

[0017] As a preferred, the thermostat comprises a mounting shell and a temperature sensing element arranged in the mounting shell; the mounting shell comprises 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 is connected with a lower valve plate through the lower seat; the temperature sensing element is sleeved with a first spring, one end of the first spring abuts against the lower seat, and the other end of the first spring is provided with an upper valve plate, the first spring pushes the upper valve plate to move upward to block the inlet of the outlet pipe, so as to separate the outlet pipe from the mounting cavity.

[0018] In the engine temperature breakthrough state, the first spring pushes the upper valve plate to block the gap between the temperature sensing element and the upper seat, so as to prevent the cooling water from being discharged outward from the outlet pipe, and at this time, the lower valve plate is separated from the small circulation end pipe, the cooling water can flow smoothly in the small circulation end pipe, and the small circulation end pipe can smoothly perform the small circulation of the engine.

[0019] With the increase of the engine temperature, the temperature of the cooling water is gradually increased, the temperature sensing element is elongated, the upper abutting ring can overcome the force of the first spring, the upper valve plate is pushed to move, the upper valve plate is separated from the upper seat, the cooling water enters the outlet pipe through the mounting cavity, and the water in the outlet pipe finally flows into the water tank to perform the large circulation. At the same time, the elongated temperature sensing element pushes the lower valve plate to abut at the opening of the small circulation end pipe to block the small circulation end pipe, so that the engine stops the small circulation. That is to say, through the above structure, the opening and closing of the large circulation and the small circulation of the engine can be automatically controlled.

[0020] As a preferred, a lower abutting ring is arranged 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 on the lower abutting ring.

[0021] With the elongation of the temperature sensing element, when the lower valve plate abuts at the opening of the small circulation end pipe, the lower valve plate can slide on the temperature sensing element, so that the strength of the lower valve plate abutting at the opening of the small circulation end pipe is not too large due to the over-elongation of the temperature sensing element.

[0022] As a preferred, the side wall of the upper seat is provided with a plurality of water passing holes.

[0023] The water passing holes facilitate the flow of the cooling water between the mounting cavity and the outlet pipe.

[0024] Compared with the prior art, the application has the beneficial effects that: a small circulation end pipe is arranged in the installation cavity of the thermostat, a plugging section is arranged in the end pipe to block the end pipe, whether to use the small circulation function can be determined according to the performance requirement of the engine, when the small circulation function is needed, the small circulation end pipe is punched through by machining, so that the engine has a small circulation structure, the production line for producing different versions of motorcycle engines is saved, and the production cost of the motorcycle engine is reduced.

[0025] In addition, the liquid inlet cavity and the liquid return cavity are integrally arranged on the crankcase in the application, so that the arrangement of the engine related pipelines can be reduced, the structure of the engine as a whole can be more compact, the production cost is reduced, and the cooling efficiency of the liquid inlet cavity and the liquid return cavity on the engine is improved. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a perspective view of the utility model.

[0027] Figure 2 is a perspective view of the crankcase of the utility model.

[0028] Figure 3 is a front view of the utility model.

[0029] Figure 4 is Figure 3 the sectional view in the A-A direction.

[0030] Figure 5 is Figure 4 the local enlarged view in the

[0031] Figure 6 is an exploded view of the cavity end cover and the end face sealing strip of the utility model.

[0032] Figure 7 is a perspective view of the utility model.

[0033] Figure 8 is a sectional view of the utility model.

[0034] In the drawing: 1, crankcase, 11, first cylinder, 12, second cylinder, 13, cooling pipeline, 131, cooling inlet, 132, cooling outlet, 14, cavity end cover, 141, end face sealing strip;

[0035] 2, liquid inlet cavity, 21, water inlet pipe, 22, oil cooler water outlet pipe;

[0036] 3, liquid return cavity;

[0037] 4, installation cavity;

[0038] 5, water outlet pipe;

[0039] 6, small circulation end pipe, 61, blocking section, 62, guide hole;

[0040] 7, thermostat, 71, upper seat, 711, water passing hole, 72, lower seat, 73, connecting strip, 74, first spring, 75, upper valve piece, 76, temperature sensing element, 761, upper abutting ring, 762, lower abutting ring, 77, second spring, 78, lower valve piece. DETAILED DESCRIPTION

[0041] The technical scheme of the utility model will be described further in detail below with specific examples and in combination with the drawings:

[0042] Example 1: refer to Figures 1 to 8 As shown in the figure, a motorcycle engine with a small circulation pipe arrangement structure comprises: a crankcase 1, a liquid inlet cavity 2 and a liquid return cavity 3 are arranged on the crankcase 1, an installation cavity 4 is further arranged in the crankcase 1 and is in communication with the liquid return cavity 3, one end of the installation cavity 4 is in communication with a water outlet pipe 5, and the other end of the installation cavity 4 is in communication with a small circulation end pipe 6;

[0043] A thermostat 7 is arranged in the installation cavity 4, and the thermostat 7 controls the communication between the small circulation pipe, the water outlet pipe 5 and the installation cavity 4; a blocking section 61 is arranged in the small circulation end pipe 6.

[0044] In the utility model, a small circulation end pipe 6 is arranged in the installation cavity 4 of the installation cavity 4 of the thermostat 7, a blocking section 61 is arranged in the end pipe 6 to block it, whether to use the small circulation function can be determined according to the performance requirement of the engine, when the small circulation function needs to be used, the small circulation end pipe 6 can be punched through by machining, so that the engine has a small circulation structure, and the production line for producing different versions of motorcycle engines is saved, and the production cost of the motorcycle engine is reduced.

[0045] Example 2: refer to Figures 1 to 8 As shown in the figure, a motorcycle engine with a small circulation pipe arrangement structure comprises: a crankcase 1, a liquid inlet cavity 2 and a liquid return cavity 3 are arranged on the crankcase 1, an installation cavity 4 is further arranged in the crankcase 1 and is in communication with the liquid return cavity 3, one end of the installation cavity 4 is in communication with a water outlet pipe 5, and the other end of the installation cavity 4 is in communication with a small circulation end pipe 6; the small circulation pipe is directly in communication with the outside of the crankcase 1;

[0046] A thermostat 7 is arranged in the installation cavity 4, and the thermostat 7 controls the communication between the small circulation pipe, the water outlet pipe 5 and the installation cavity 4; a blocking section 61 is arranged in the small circulation end pipe 6, so as to select whether to use the small circulation function according to the requirement. The blocking section 61 blocks the small circulation pipe, and the blocking section 61 is arranged to form a guide hole 62 on the side of the small circulation end pipe 6 away from the installation cavity 4; when it is required to eliminate the blocking section 61 and make the small circulation pipe through, the blocking section 61 can be machined along the guide hole 62 to make the small circulation pipe through, so that the motorcycle engine is facilitated to arrange the small circulation structure.

[0047] In the utility model, a small circulation end pipe 6 is arranged in the installation cavity 4 of the thermostat 7, and a blocking section 61 is arranged in the end pipe 6 to block the end pipe 6; whether to use the small circulation function can be determined according to the performance requirement of the engine; when the small circulation function is required to be used, the small circulation end pipe 6 can be machined to make the small circulation end pipe 6 through, so that the engine has the small circulation structure, and the production line for producing different versions of motorcycle engines is omitted, and the production cost of the motorcycle engine is reduced.

[0048] In one of the embodiments, the crankcase 1 is further provided with a first cylinder 11 and a second cylinder 12, the first cylinder 11 and the second cylinder 12 are arranged obliquely, and the first cylinder 11 and the second cylinder 12 form a V-shaped structure, and the liquid inlet cavity 2 and the liquid return cavity 3 are arranged between the first cylinder 11 and the second cylinder 12. Cooling pipes 13 are arranged in the first cylinder 11 and the second cylinder 12, and the cooling liquid flows into the cooling pipes 13 from the liquid inlet cavity 2 and flows out of the liquid return cavity 3. Specifically, cooling inlets 131 are arranged at both ends of the liquid inlet cavity 2 and are communicated with the cooling pipes 13 of the first cylinder 11 and the second cylinder 12, and cooling outlets 132 are arranged at both ends of the liquid return cavity 3 and are communicated with the cooling pipes 13 of the first cylinder 11 and the second cylinder 12, and the cooling liquid in the liquid return cavity 3 flows into the cooling pipes 13 of the first cylinder 11 and the second cylinder 12 from the cooling inlets 131 and then flows into the liquid return cavity 3 from the cooling outlets 132.

[0049] In one of the embodiments, a water inlet pipe 21 is arranged at one end of the liquid inlet cavity 2, and an oil cooler water outlet pipe 22 is arranged at the other end of the liquid inlet cavity 2. The water inlet pipe 21 is communicated with a water tank, and the water in the water tank is pumped into the liquid inlet cavity 2 by a water pump. The water in the liquid inlet cavity 2 is divided into two paths, one of which enters the cooling pipes 13 of the first cylinder 11 and the second cylinder 12 to cool the first cylinder 11 and the second cylinder 12, and the other of which cools the oil cooler through the oil cooler water outlet pipe 22.

[0050] The cavity end cover 14 is arranged on the crankcase 1, and the cavity end cover 14 cooperates with the crankcase 1 to form the liquid inlet cavity 2 and the liquid return cavity 3. In the embodiment, the liquid inlet cavity 2 and the liquid return cavity 3 are integrally arranged on the crankcase 1, so that the liquid inlet cavity 2 and the liquid return cavity 3 are integrated on the crankcase 1. This can reduce the arrangement of engine-related pipelines, make the overall structure of the engine more compact, reduce the cost, and improve the cooling efficiency of the liquid inlet cavity 2 and the liquid return cavity 3 on the engine.

[0051] The arrangement of the cavity end cover 14 facilitates the opening of the liquid inlet cavity 2 and the liquid return cavity 3, and facilitates the maintenance of the parts inside the crankcase 1 through the liquid inlet cavity 2 and the liquid return cavity 3.

[0052] In order to improve the sealing performance between the cavity end cover 14 and the crankcase 1, an end face groove is arranged on the edge of the cavity end cover 14 and distributed along the end face of the cavity end cover 14. An end face sealing strip 141 is arranged in the end face groove and cooperates with the end face groove. The end face sealing strip 141 is made of rubber material and tightly abuts between the cavity end cover 14 and the crankcase 1, thereby improving the sealing performance between the cavity end cover 14 and the crankcase 1 and preventing the cooling liquid from leaking from the gap between the cavity end cover 14 and the crankcase 1.

[0053] In the application, a small circulation end pipe 6 is arranged in the mounting cavity 4 in which the thermostat 7 is mounted. The end pipe 6 is provided with a blocking section 61 for blocking the end pipe 6. Whether the small circulation function is used can be determined according to the performance requirements of the engine. When the small circulation function is needed, the small circulation end pipe 6 can be machined to be open, so that the engine has a small circulation structure, and the production line for producing different versions of motorcycle engines is omitted, thereby reducing the production cost of the motorcycle engine.

[0054] In addition, the liquid inlet cavity 2 and the liquid return cavity 3 are integrally arranged on the crankcase 1 in the application. This can reduce the arrangement of engine-related pipelines, make the overall structure of the engine more compact, reduce the production cost, and improve the cooling efficiency of the liquid inlet cavity 2 and the liquid return cavity 3 on the engine.

[0055] Embodiment 3: Referring to Figures 1 to 8 As shown in the figure, a motorcycle engine with a small circulation pipe arrangement structure comprises a crankcase 1, a liquid inlet cavity 2 and a liquid return cavity 3 arranged on the crankcase 1, a mounting cavity 4 arranged in the crankcase 1 and communicating with the liquid return cavity 3, one end of the mounting cavity 4 communicating with a water outlet pipe 5, and the other end of the mounting cavity 4 communicating with a small circulation end pipe 6; the small circulation pipe directly communicates with the outside of the crankcase 1.

[0056] A thermostat 7 is arranged in the installation cavity 4, and the thermostat 7 controls the communication between the small circulation pipe, the water outlet pipe 5 and the installation cavity 4; a blocking section 61 is arranged in the small circulation end pipe 6, and the blocking section 61 blocks the small circulation pipe; the blocking section 61 is arranged to form a guide hole 62 on the side of the small circulation end pipe 6 away from the installation cavity 4; when it is needed to eliminate the blocking section 61 and make the small circulation pipe through, the blocking section 61 can be machined along the guide hole 62 to make the small circulation pipe through, so that the small circulation structure is convenient for the motorcycle engine.

[0057] In the utility model, a small circulation end pipe 6 is arranged in the installation cavity 4 of the thermostat 7, and a blocking section 61 is arranged in the end pipe 6 to block the end pipe 6; whether the small circulation function is used can be determined according to the performance requirement of the engine; when the small circulation function is needed, the small circulation end pipe 6 can be machined to make the small circulation end pipe 6 through, so that the engine has the small circulation structure; the production line for producing different versions of motorcycle engines is saved, and the production cost of the motorcycle engine is reduced.

[0058] In one of the embodiments, the crankcase 1 is further provided with a first cylinder 11 and a second cylinder 12, the first cylinder 11 and the second cylinder 12 are arranged obliquely, the first cylinder 11 and the second cylinder 12 form a V-shaped structure, and the liquid inlet cavity 2 and the liquid return cavity 3 are arranged between the first cylinder 11 and the second cylinder 12. Cooling pipes 13 are arranged in the first cylinder 11 and the second cylinder 12, and the cooling liquid flows into the cooling pipes 13 from the liquid inlet cavity 2 and flows out of the liquid return cavity 3. Specifically, cooling inlets 131 are arranged at both ends of the liquid inlet cavity 2 and are communicated with the cooling pipes 13 of the first cylinder 11 and the second cylinder 12, and cooling outlets 132 are arranged at both ends of the liquid return cavity 3 and are communicated with the cooling pipes 13 of the first cylinder 11 and the second cylinder 12. The cooling liquid in the liquid return cavity 3 flows into the cooling pipes 13 of the first cylinder 11 and the second cylinder 12 from the cooling inlets 131, and then flows into the liquid return cavity 3 from the cooling outlets 132.

[0059] In one of the embodiments, a water inlet pipe 21 is arranged at one end of the liquid inlet cavity 2, and an oil cooler water outlet pipe 22 is arranged at the other end of the liquid inlet cavity 2. The water inlet pipe 21 is communicated with a water tank, and the water in the water tank is pumped into the liquid inlet cavity 2 by a water pump. The water in the liquid inlet cavity 2 is divided into two paths, one of which enters the cooling pipes 13 of the first cylinder 11 and the second cylinder 12 to cool the first cylinder 11 and the second cylinder 12, and the other of which cools the oil cooler through the oil cooler water outlet pipe 22.

[0060] The cavity end cover 14 is arranged on the crankcase 1, and the cavity end cover 14 cooperates with the crankcase 1 to form the liquid inlet cavity 2 and the liquid return cavity 3. In the embodiment, the liquid inlet cavity 2 and the liquid return cavity 3 are integrally arranged on the crankcase 1, so that the liquid inlet cavity 2 and the liquid return cavity 3 are integrated on the crankcase 1, which can not only reduce the arrangement of the engine related pipelines, but also make the structure of the engine more compact, reduce the cost, and improve the cooling efficiency of the liquid inlet cavity 2 and the liquid return cavity 3 on the engine.

[0061] The arrangement of the cavity end cover 14 can facilitate the opening of the liquid inlet cavity 2 and the liquid return cavity 3, and facilitate the maintenance of the parts inside the crankcase 1 through the liquid inlet cavity 2 and the liquid return cavity 3.

[0062] In order to improve the sealing performance between the cavity end cover 14 and the crankcase 1, an end face groove is arranged on the edge of the cavity end cover 14 and distributed along the end face of the cavity end cover 14, and an end face sealing strip 141 cooperating with the end face groove is arranged in the end face groove. The end face sealing strip 141 is made of rubber material, and the end face sealing strip 141 can be tightly abutted between the cavity end cover 14 and the crankcase 1, so as to improve the sealing performance between the cavity end cover 14 and the crankcase 1, and prevent the cooling liquid from leaking from the gap between the cavity end cover 14 and the crankcase 1.

[0063] In the application, a small circulation end pipe 6 is arranged in the installation cavity 4 in which the thermostat 7 is installed, and a blocking section 61 is arranged in the end pipe 6 to block the end pipe 6. Whether the small circulation function is used can be determined according to the performance requirements of the engine. When the small circulation function is needed, the small circulation end pipe 6 can be machined to be open, so that the engine has a small circulation structure, and the production line for producing different versions of motorcycle engines is omitted, and the production cost of the motorcycle engine is reduced.

[0064] In addition, the liquid inlet cavity 2 and the liquid return cavity 3 are integrally arranged on the crankcase 1, which can not only reduce the arrangement of the engine related pipelines, but also make the structure of the engine more compact, reduce the production cost, and improve the cooling efficiency of the liquid inlet cavity 2 and the liquid return cavity 3 on the engine.

[0065] The embodiment is similar to the structure of the embodiment 2, and the difference is that the thermostat 7 comprises a mounting shell and a temperature sensing element 76 arranged in the mounting shell; the mounting shell is mounted in the mounting cavity 4. The mounting shell comprises an upper seat 71 and a lower seat 72, and the upper seat 71 and the lower seat 72 are connected by a plurality of connecting strips 73; the side wall of the upper seat 71 is provided with a plurality of water passing holes 711, facilitating the flow of cooling water between the mounting cavity 4 and the water outlet pipe 5. The temperature sensing element 76 is in a strip shape, and when the temperature rises, the temperature sensing element 76 can gradually elongate with the increase of the temperature, and when the temperature decreases, the length gradually shortens. One end of the temperature sensing element 76 abuts against the upper seat 71, and the other end of the temperature sensing element 76 passes through the lower seat 72 to connect a lower valve plate; the temperature sensing element 76 is sleeved with a first spring 74, one end of the first spring 74 abuts against the lower seat 72, and the other end of the first spring 74 is provided with an upper valve plate 75; the first spring 74 pushes the upper valve plate 75 to move upward to block the inlet of the water outlet pipe 5, so that the water outlet pipe 5 is separated from the mounting cavity 4.

[0066] Specifically, the upper abutting ring 761 is arranged on the outer side wall of the upper end of the temperature sensing element 76, and the inner and outer rings of the upper valve plate 75 abut against the upper abutting ring 761 and the circumferential direction of the upper seat 71 respectively, so as to block the gap between the temperature sensing element 76 and the upper seat 71, thereby separating the water outlet pipe 5 from the mounting cavity 4 and preventing the cooling water from flowing out of the water outlet pipe 5.

[0067] In the engine temperature low state, the first spring 74 pushes the upper valve plate 75 to block the gap between the temperature sensing element 76 and the upper seat 71, so as to prevent the cooling water from flowing out of the water outlet pipe 5, and at this time, the lower valve plate is separated from the small circulation end pipe 6, so that the cooling water can flow smoothly in the small circulation end pipe 6, and the small circulation end pipe 6 can smoothly perform the small circulation of the engine.

[0068] With the increase of the engine temperature, the temperature of the cooling water gradually increases, so that the temperature sensing element 76 elongates, so that the upper abutting ring 761 can overcome the force of the first spring 74 to push the upper valve plate 75 to move, so that the upper valve plate 75 is separated from the upper seat 71, and the cooling water enters the water outlet pipe 5 through the mounting cavity 4, and finally flows into the water tank to perform the large circulation. At the same time, the elongated temperature sensing element 76 pushes the lower valve plate to abut against the opening of the small circulation end pipe 6 to block the small circulation end pipe 6, so that the engine stops the small circulation. That is, through the above structure, the opening and closing of the large circulation and the small circulation of the engine can be automatically controlled.

[0069] In one embodiment, a lower abutting ring 762 is arranged at the bottom of the temperature sensing element 76, and a second spring 77 is arranged below the temperature sensing element 76, and the second spring 77 pushes the lower valve plate to abut against the lower abutting ring 762. With the elongation of the temperature sensing element 76, when the lower valve plate abuts at the opening of the small circulation end pipe 6, the lower valve plate can slide on the temperature sensing element 76, so that the strength of the lower valve plate abutting at the opening of the small circulation end pipe 6 can be avoided to be too large due to the over-elongation of the temperature sensing element 76.

[0070] In the present application, a small circulation end pipe 6 is arranged in the installation cavity 4 where the thermostat 7 is installed, and a blocking section 61 is arranged in the end pipe 6 to block the end pipe 6, and whether the small circulation function is used can be determined according to the performance requirement of the engine, and when the small circulation function is needed, the small circulation end pipe 6 can be machined to be opened, so that the engine has a small circulation structure, and the production line of different versions of motorcycle engines is omitted, and the production cost of the motorcycle engine is reduced.

[0071] In addition, the liquid inlet cavity 2 and the liquid return cavity 3 are integrally arranged on the crankcase 1, which not only can reduce the arrangement of the engine related pipelines, so that the structure of the engine as a whole can be more compact, the production cost is reduced, and the cooling efficiency of the liquid inlet cavity 2 and the liquid return cavity 3 on the engine is improved.

[0072] The above-described embodiments are only the preferred schemes of the present application, and do not limit the present application in any form, and other variants and modifications are also possible without exceeding the technical schemes recited in the claims.

Claims

1. A motorcycle engine with a small circulation pipe arrangement, characterized in that, include: The crankcase has an inlet chamber and a return chamber. Inside the crankcase, there is also an installation chamber that communicates with the return chamber. One end of the installation chamber is connected to the outlet pipe, and the other end of the installation chamber is connected to the small circulation end pipe. A thermostat is installed inside the installation cavity, which controls the connection between the small circulation end pipe, the outlet pipe and the installation cavity; a sealing section is installed inside the small circulation end pipe.

2. The motorcycle engine with a small circulation pipe arrangement structure according to claim 1, characterized in that, It also includes a first cylinder and a second cylinder installed on the crankcase. Both the first cylinder and the second cylinder are equipped with cooling pipes. Coolant enters the cooling pipes from the inlet chamber and then flows out from the outlet chamber.

3. The motorcycle engine with a small circulation pipe arrangement structure according to claim 1, characterized in that, A water inlet pipe is provided at one end of the liquid inlet chamber, and an oil cooler outlet pipe is provided at the other end of the liquid inlet chamber.

4. The motorcycle engine with a small circulation pipe arrangement structure according to any one of claims 1 to 3, characterized in that, A cavity end cover is provided on the crankcase, which cooperates with the crankcase to form an inlet cavity and a return cavity.

5. The motorcycle engine with a small circulation pipe arrangement structure according to claim 4, characterized in that, An end face groove is provided along the edge of the cavity end cover, and an end face seal is provided in the end face groove to cooperate with it.

6. The motorcycle engine with a small circulation pipe arrangement according to any one of claims 1 to 3, characterized in that, The thermostat includes a mounting housing and a temperature sensing element disposed within the mounting housing. The mounting housing 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 to a lower valve plate. A first spring is disposed outside the temperature sensing element. One end of the first spring abuts against the lower seat, and the other end of the first spring is disposed on an upper valve plate. The first spring pushes the upper valve plate to move upward to block the inlet of the water outlet pipe, thereby separating the water outlet pipe from the mounting cavity.

7. The motorcycle engine with a small circulation pipe arrangement structure according to claim 6, characterized in that, A lower abutment 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 abutment ring.

8. The motorcycle engine with a small circulation pipe arrangement structure according to claim 6, characterized in that, The upper seat has several water-permeable holes on its side wall.

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