Engine and motorcycle

Abstract

The application discloses an engine, which comprises a cylinder head water jacket, a cylinder body water jacket, an oil-water exchanger and a thermostat, all of which are used for circulating cooling liquid; the oil-water exchanger and the thermostat are both communicated with a cylinder head water outlet of the cylinder head water jacket and with the cylinder body water jacket; a backwater part is provided with a backwater channel and a backwater valve for the flow of the cooling liquid; the backwater part is respectively communicated with the cylinder head water outlet and the cylinder body water jacket; when a main valve of the thermostat is closed, the backwater valve is opened to make the backwater channel in a conducting state; when the main valve of the thermostat is opened, the backwater valve is closed to make the backwater channel in a cut-off state. The engine provided by the application is provided with the backwater part between the cylinder head water jacket and the cylinder body water jacket; when the main valve of the thermostat is in a closed state, part of the cooling liquid can flow into the cylinder body water jacket through the backwater part, the flow into the oil-water exchanger is reduced, the influence on the oil-water exchanger is improved, and the service life of the oil-water exchanger is prolonged. The application further discloses a motorcycle.

Description

Technical Field

[0001] This invention relates to the field of motorcycle engine technology, and more particularly to an engine and a motorcycle. Background Technology

[0002] With the rapid development of motorcycle engine technology, the thermal load control of multi-cylinder high-power engines is becoming increasingly difficult, and cooling system solutions are becoming more and more complex. High-performance engines often have oil-water exchangers. When the temperature of the coolant flowing out of the engine is lower than the fully open temperature of the thermostat main valve, the thermostat main valve in the thermostat chamber is closed. At this time, a large amount of coolant flowing out of the engine will flow into the oil-water exchanger. However, due to the large flow rate of the coolant and the small flow cross-section of the oil-water exchanger inlet, a sharp increase in local pressure and velocity will occur, which will exert a large impact force on the heat dissipation fins inside the oil-water exchanger and affect the service life of the oil-water exchanger.

[0003] Therefore, how to reduce the impact of large amounts of coolant on oil-water exchangers in order to improve their service life is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0004] In view of this, the object of the present invention is to provide an engine that reduces the impact of a large amount of coolant on the oil-water exchanger, thereby improving the service life of the oil-water exchanger;

[0005] Another object of the present invention is to provide a motorcycle having the above-described engine.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An engine includes a cylinder head water jacket, a cylinder block water jacket, an oil-water exchanger, and a thermostat for coolant circulation. The oil-water exchanger and the thermostat chamber of the thermostat are both connected to the cylinder head outlet of the cylinder head water jacket and are also connected to the cylinder block water jacket.

[0008] The return water section is provided with a cavity for coolant flow and a return water valve. The return water section is connected to the cylinder head outlet and the cylinder block water jacket respectively. When the thermostat main valve in the thermostat chamber is closed, the return water valve is opened to make the return water cavity open. When the thermostat main valve is open, the return water valve is closed to make the return water cavity closed.

[0009] Optionally, in the above-mentioned engine, the return water section is provided with a return water chamber for containing coolant. The return water chamber is connected to the cylinder block water jacket through the return water passage, and the return water chamber is connected to the thermostat chamber, so that the return water chamber is connected to the cylinder head outlet through the thermostat chamber.

[0010] Optionally, in the above-mentioned engine, a return water hole is provided between the return water chamber and the thermostat chamber. The return water hole is connected to the inner cavity of the return water chamber and the inner cavity of the thermostat chamber, so that the return water chamber is connected to the thermostat chamber through the return water hole.

[0011] Optionally, in the above-mentioned engine, an on / off gap is provided between the return water hole and the base of the thermostat main valve. When the thermostat main valve is in the closed state, the return water hole connects the return water chamber and the thermostat chamber through the on / off gap. When the thermostat main valve is in the open state, the base of the thermostat main valve moves to the return water hole to block the return water hole, so that the return water chamber and the thermostat chamber are independent of each other.

[0012] Optionally, in the above-mentioned engine, the return water chamber and the thermostat chamber are an integral structure.

[0013] Optionally, in the above-mentioned engine, the cylinder inlet and cylinder outlet of the cylinder water jacket are distributed on both sides of the engine cylinder with the center of the cylinder as the center of symmetry.

[0014] The cylinder head water jacket has a cylinder head inlet and a cylinder head outlet symmetrically distributed on both sides of the engine cylinder head, and the cylinder head inlet and outlet are located on the center symmetry line at both ends of the engine cylinder head.

[0015] Optionally, in the above-mentioned engine, the cylinder inlet and the cylinder outlet are arranged at both ends of the engine cylinder.

[0016] Optionally, in the above-mentioned engine, the cylinder block inlet and cylinder block outlet are located on the central symmetry line at both ends of the engine cylinder block.

[0017] Optionally, in the above-mentioned engine, both the cylinder block water jacket and the cylinder head water jacket are provided with multiple water passage holes, which allow coolant to flow from the cylinder head water jacket into the cylinder block water jacket.

[0018] The engine provided by this invention has a return water section between the cylinder head water jacket and the cylinder block water jacket, so that the coolant flowing out of the cylinder head outlet of the cylinder head water jacket flows into the cylinder block water jacket through the return water section. When the thermostat main valve is closed, the return water valve of the return water section is opened, and the cavity of the return water section is open, so that part of the coolant flowing out of the cylinder head outlet flows back to the cylinder block water jacket through the return water section. When the thermostat main valve is open, the return water valve of the return water section is closed, so that the cavity of the return water section is cut off, and the coolant cannot flow in the cavity of the return water section.

[0019] Compared with existing technologies, when the thermostat main valve is closed, part of the coolant flowing out of the cylinder head outlet can flow directly back to the cylinder water jacket through the return water section, which significantly reduces the water flow into the oil-water exchanger, effectively improves the local pressure and alleviates the impact force on the oil-water exchanger, thereby improving the service life of the oil-water exchanger.

[0020] A motorcycle includes an engine, said engine being the engine described in any of the preceding claims.

[0021] The motorcycle provided by this invention, having the aforementioned engine, possesses all the technical effects of the aforementioned engine, which will not be elaborated upon here. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the engine structure disclosed in an embodiment of the present invention;

[0024] Figure 2 This is a schematic diagram of the structure of the return water chamber and the thermostat chamber disclosed in an embodiment of the present invention;

[0025] Figure 3 This is a schematic diagram of the symmetrically distributed cylinder inlet and cylinder outlet as disclosed in an embodiment of the present invention;

[0026] Figure 4 This is a schematic diagram of a cylinder body with symmetrically distributed water inlet and outlet, as disclosed in another embodiment of the present invention.

[0027] Figure 5 This is a schematic diagram of a cylinder body with symmetrically distributed water inlet and outlet, as disclosed in another embodiment of the present invention.

[0028] Figure 6 This is a schematic diagram of the structure of the water passage hole disclosed in an embodiment of the present invention.

[0029] Among them, 100 is the return water section, 110 is the return water chamber, and 120 is the return water channel;

[0030] 200 is the thermostat, 210 is the thermostat chamber, and 220 is the thermostat main valve;

[0031] 300 is the return water hole;

[0032] 400 represents the on / off interval;

[0033] 500 is the cylinder water jacket, 510 is the cylinder inlet, and 520 is the cylinder outlet.

[0034] 600 is the cylinder head water jacket, 610 is the cylinder head inlet, and 620 is the cylinder head outlet.

[0035] 700 is the water passage hole;

[0036] 800 is the oil-water exchanger cavity. Detailed Implementation

[0037] The purpose of this invention is to provide an engine that reduces the impact of large amounts of coolant on the oil-water exchanger, thereby improving the service life of the oil-water exchanger;

[0038] Another object of the present invention is to provide a motorcycle having the above-described engine.

[0039] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0040] like Figure 1As shown in the figure, an embodiment of the present invention discloses an engine, including a cylinder head water jacket 600, a cylinder block water jacket 500, an oil-water exchanger, a return water section 100, and a thermostat 200. Both the cylinder head water jacket 600 and the cylinder block water jacket 500 are provided with cavities for coolant circulation. The cylinder head inlet 610 and cylinder head outlet 620 of the cylinder head water jacket 600, and the cylinder block inlet 510 and cylinder block outlet 520 of the cylinder block water jacket 500, are used for coolant inflow and outflow. The cylinder head water jacket 600 is connected to the oil-water exchanger and the thermostat chamber 210 of the thermostat 200 through the cylinder head outlet 620, so that the coolant circulating from the cylinder head water jacket 600 can flow into the oil-water exchanger and the thermostat chamber 210. Meanwhile, the return water section 100 is connected to the cylinder head outlet 620 and the cylinder block water jacket 500 through the return water channel 120. The return water section 100 is also equipped with a return water valve. When the thermostat main valve 220 in the thermostat chamber 210 is closed, the return water valve is opened to make the channel of the return water section 100 open. The coolant flowing out of the cylinder head outlet 620 can be partially flowed directly into the cylinder block water jacket 500 through the return water section 100, thereby reducing the flow rate into the oil-water exchanger. This significantly alleviates the adverse effects of the large amount of coolant flowing in and the small cross-section of the oil-water exchanger inlet, which causes a sharp increase in local pressure and flow rate of the coolant, on the oil-water exchanger, thereby improving the service life of the oil-water exchanger. When the thermostat main valve 220 is open, the return water valve closes and shuts off the return water passage 120, preventing the coolant flowing out of the cylinder head outlet 620 from flowing into the cylinder block water jacket 500 through the return water passage 120. This ensures that sufficient coolant flows into the radiator through the thermostat 200, and after being cooled by the radiator, the coolant finally flows into the cylinder block water jacket 500.

[0041] like Figure 2 As shown, the return water section 100 is provided with a return water chamber 110, which has a space for containing coolant. The return water chamber 110 is connected to the cylinder block inlet 510 through a return water passage 120, and is also connected to the thermostat chamber 210. Therefore, the return water chamber 110 is connected to the cylinder head outlet 620 of the cylinder head water jacket 600 through the thermostat chamber 210. The return water chamber 110 can enhance the coolant capacity of the return water section 100, further improving the ability of the return water section 100 to share the coolant flow, and can also buffer the coolant flow rate. In a specific embodiment, the oil-water exchanger passage 800 of the oil-water exchanger is also connected to the return water passage 120, thereby allowing the coolant from the oil-water exchanger to flow into the cylinder block water jacket 500.

[0042] In a specific embodiment, a return water hole 300 is provided between the return water chamber 110 and the thermostat chamber 210. The return water hole 300 is opened on the shell wall between the return water chamber 110 and the thermostat chamber 210, connecting the inner cavity of the return water chamber 110 and the inner cavity of the thermostat chamber 210. Thus, the return water chamber 110 is connected to the thermostat chamber 210 through the return water hole 300, realizing the mutual communication between the return water chamber 110 and the thermostat chamber 210.

[0043] like Figure 2 As shown, a switching gap 400 is provided between the opening of the return water hole 300 on one side of the thermostat chamber 210 and the base of the thermostat main valve 220. Therefore, when the coolant temperature has not reached the opening temperature of the thermostat main valve 220, and the thermostat main valve 220 is in the closed state, the coolant flows into the return water hole 300 through the switching gap 400 and then into the return water chamber 110. When the coolant temperature reaches the opening temperature of the thermostat main valve 220, the thermostat main valve 220 opens, and the base of the thermostat main valve 220 moves towards the return water hole 300 until the end face of the base of the thermostat main valve 220 is in contact with the inner wall of the thermostat chamber 210, blocking the return water hole 300. At this time, the return water chamber 110 and the thermostat chamber 210 are independently separated, so that the coolant cannot flow to the cylinder block water jacket 500 through the return water section 100, thereby realizing the function of the return water valve. This design scheme achieves the flow and cut-off of coolant in the return water section 100 when the thermostat main valve 220 is in different states by simply cooperating with the return water hole 300 and the base of the thermostat main valve 220. No additional actuators are required, making the overall structure of the return water section 100 simple and with high operational reliability, and avoiding the impact on the overall engine weight reduction caused by adding other parts.

[0044] In one specific embodiment, the diameter of the return water hole 300 is 5mm-10mm to ensure optimal coolant flow and prevent the return water hole 300 from being too large or too small, which could affect the performance of the return water section 100. Alternatively, those skilled in the art can design the diameter of the return water hole 300 according to actual needs to ensure that the return water section 100 has good flow distribution capability.

[0045] To enhance the structural strength and stability of the connection between the return water chamber 110 and the thermostat chamber 210, the return water chamber 110 and the thermostat chamber 210 are machined as a single unit. The integrated structural design of the return water chamber 110 and the thermostat chamber 210 also improves the processing efficiency of the engine provided in this embodiment and reduces the processing cost.

[0046] To address the issue of uneven coolant flow in the engine block water jacket 500 leading to significant differences in heat transfer between cylinders, thus hindering the control of thermal stress and power uniformity, this embodiment provides an engine where the cylinder block inlet 510 and cylinder block outlet 520 of the cylinder block water jacket 500 are symmetrically distributed on both sides of the engine block with the center of the cylinder block as the center. Similarly, the cylinder head inlet 610 and cylinder head outlet 620 of the cylinder head water jacket 600 are symmetrically distributed on both sides of the engine cylinder head, with the cylinder head inlet 610 and cylinder head outlet 620 located on the central symmetry line at both ends of the engine cylinder head. This ensures that the coolant entering from the cylinder block inlet 510 of the cylinder block water jacket 500 flows along the same path on both sides of the cylinder block water jacket 500 and flows to the water pump from the cylinder block outlet 520. This improves the uniformity of coolant flow on both sides of the cylinder block water jacket 500 and reduces the risk of uneven thermal deformation of the cylinder block water jacket 500 caused by localized temperature differences.

[0047] like Figure 3 and Figure 4 As shown, the cylinder head water jacket 600 has cylinder head inlet 610 and cylinder head outlet 620 symmetrically distributed on both sides of the engine cylinder head and located on the central symmetry line at both ends of the engine cylinder head. The cylinder block water jacket 500 has cylinder block inlet 510 and cylinder block outlet 520 distributed on both sides of the engine cylinder block with the center of the cylinder block as the center of symmetry and arranged at both ends of the engine cylinder block to achieve uniform flow of coolant on both sides of the cylinder block water jacket 500.

[0048] In another specific embodiment, such as Figure 5 As shown, the cylinder head water jacket 600 has a cylinder head inlet 610 and a cylinder head outlet 620 symmetrically distributed on both sides of the engine cylinder head and located on the central symmetry line at both ends of the engine cylinder head. The cylinder block water jacket 500 has a cylinder block inlet 510 and a cylinder block outlet 520 distributed on both sides of the engine cylinder block with the center of the cylinder block as the center of symmetry and also located on the central symmetry line at both ends of the engine cylinder block, so as to achieve uniform flow of coolant on both sides of the cylinder block water jacket 500.

[0049] like Figure 6 As shown, both the cylinder block water jacket 500 and the cylinder head water jacket 600 are provided with multiple water passage holes 700. Therefore, some of the coolant in the cylinder head water jacket 600 flows into the cylinder block water jacket 500 through the water passage holes 700, thereby increasing the coolant circulation path in the cylinder block water jacket 500 and the cylinder head water jacket 600 and improving the heat dissipation capacity of the cylinder block water jacket 500 and the cylinder head water jacket 600 for each cylinder.

[0050] Therefore, in a specific embodiment, taking the arrangement of the cylinder head water jacket 600 with the cylinder head inlet 610 and cylinder head outlet 620 located on the central symmetrical line at both ends of the engine cylinder head, and the cylinder block water jacket 500 with the cylinder block inlet 510 and cylinder block outlet 520 located at both ends of the engine cylinder block with the center of the cylinder block as the symmetrical center, the coolant flow path of the engine provided in this embodiment is as follows: When the temperature of the coolant circulating in the engine cooling system is higher than the opening temperature of the thermostat main valve 220, the thermostat main valve 220 opens, and the base of the thermostat main valve 220 moves toward the return water hole 300 until the end face of the base of the thermostat main valve 220 fits against the inner wall of the thermostat chamber 210 to block the return water hole 300. At this point, the coolant flows directly from the cylinder head inlet 610 into the cylinder head water jacket 600 after exiting the water pump. A small portion of the coolant in the cylinder head water jacket 600 flows through the water hole 700 to the cylinder block water jacket 500, while most of the coolant flows through the cylinder head outlet 620 to the thermostat chamber 210 and the oil-water exchanger. Some coolant flows into the cylinder block water jacket 500 through the oil-water exchanger channel 800, while the remaining coolant flows from the thermostat 200 to the radiator. After cooling the coolant, the radiator returns through the cylinder block inlet 510. Finally, the coolant in the cylinder block water jacket 500 flows out from the cylinder block outlet 520 and re-enters the water pump, thus achieving coolant circulation.

[0051] When the coolant temperature in the engine cooling system circulation is lower than the opening temperature of the thermostat main valve 220, the thermostat main valve 220 is closed and the return water section 100 is open, so that the coolant can flow into the return water hole 300 through the on / off interval 400, and then into the return water chamber 110. The coolant in the return water chamber 110 can then flow into the cylinder block water jacket 500 through the return water passage 120. At this point, the coolant in the water pump flows into the cylinder head water jacket 600 through the cylinder head inlet 610. Part of the coolant in the cylinder head water jacket 600 flows directly into the cylinder block water jacket 500 through the water passage 700. The remaining coolant flowing out from the cylinder head outlet 620 flows into the cylinder block water jacket 500 through the oil-water exchanger channel 800. The coolant flowing into the thermostat chamber 210, due to the thermostat 200 being closed, no longer flows into the radiator but instead flows into the return water chamber 110 through the return water hole 300. The coolant in the return water chamber 110 then flows into the cylinder block water jacket 500 through the return water channel 120. This avoids all the coolant directly flowing into the oil-water exchanger and back into the cylinder block water jacket 500, thus reducing the risk of excessive impact on the oil-water exchanger due to excessive coolant flow velocity and extending its service life. Finally, the coolant in the cylinder block water jacket 500 flows back to the water pump through the cylinder block inlet 520.

[0052] This invention also discloses a motorcycle, including an engine. Since this motorcycle has the aforementioned engine, it possesses all the technical effects of the engine described above, and will not be repeated here.

[0053] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0054] As indicated in this application and claims, unless the context clearly indicates otherwise, the words "a," "an," "a," and / or "the" are not specifically singular and may include the plural. Generally, the terms "comprising" and "including" only indicate the inclusion of expressly identified steps and elements, which do not constitute an exclusive list, and the method or apparatus may also include other steps or elements. An element defined by the phrase "comprising an..." does not exclude the presence of other identical elements in the process, method, product, or apparatus that includes the element.

[0055] In the description of the embodiments of this application, unless otherwise stated, " / " means "or", for example, A / B can mean A or B; "and / or" in this document is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Furthermore, in the description of the embodiments of this application, "multiple" refers to two or more.

[0056] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An engine for a motorcycle, comprising a cylinder head water jacket (600), a cylinder block water jacket (500), an oil-water exchanger, and a thermostat (200) for coolant circulation, wherein the oil-water exchanger and the thermostat chamber (210) of the thermostat (200) are both connected to the cylinder head outlet (620) of the cylinder head water jacket (600) and to the cylinder block water jacket (500), characterized in that: The return water section (100) is provided with a return water channel (120) for coolant flow and a return water valve. The return water section (100) is connected to the cylinder head outlet (620) and the cylinder block water jacket (500) respectively. When the thermostat main valve (220) in the thermostat chamber (210) is closed, the return water valve is opened to make the return water channel (120) in a conducting state. When the thermostat main valve (220) is open, the return water valve is closed to make the return water channel (120) in a shut-off state. The return water section (100) is provided with a return water chamber (110) for containing coolant. The return water chamber (110) is connected to the cylinder block water jacket (500) through the return water channel (120), and the return water chamber (110) is connected to the thermostat chamber (210), so that the return water chamber (110) is connected to the cylinder head outlet (620) through the thermostat chamber (210). A return water hole (300) is provided between the return water chamber (110) and the thermostat chamber (210). The return water hole (300) is connected to the inner cavity of the return water chamber (110) and the inner cavity of the thermostat chamber (210) respectively, so that the return water chamber (110) is connected to the thermostat chamber (210) through the return water hole (300). A switching gap (400) is provided between the return water hole (300) and the base of the thermostat main valve (220). When the thermostat main valve (220) is closed, the return water hole (300) connects the return water chamber (110) and the thermostat chamber (210) through the switching gap (400). When the thermostat main valve (220) is open, the base of the thermostat main valve (220) moves to the return water hole (300) to block the return water hole (300), so that the return water chamber (110) and the thermostat chamber (210) are independent of each other.

2. The engine according to claim 1, characterized in that, The return water chamber (110) and the thermostat chamber (210) are an integral structure.

3. The engine according to claim 1, characterized in that, The cylinder inlet (510) and cylinder outlet (520) of the cylinder water jacket (500) are distributed on both sides of the engine cylinder with the center of the cylinder as the center of symmetry. The cylinder head water jacket (600) has a cylinder head inlet (610) and a cylinder head outlet (620) symmetrically distributed on both sides of the engine cylinder head, and the cylinder head inlet (610) and the cylinder head outlet (620) are located on the central symmetry line at both ends of the engine cylinder head.

4. The engine according to claim 3, characterized in that, The cylinder inlet (510) and the cylinder outlet (520) are located at both ends of the engine cylinder.

5. The engine according to claim 3, characterized in that, The cylinder inlet (510) and cylinder outlet (520) are located on the central symmetrical line at both ends of the engine cylinder.

6. The engine according to claim 1, characterized in that, Both the cylinder block water jacket (500) and the cylinder head water jacket (600) are provided with multiple water passage holes (700), which allow coolant to flow from the cylinder head water jacket (600) into the cylinder block water jacket (500).

7. A motorcycle, characterized in that, Includes an engine, wherein the engine is the engine as described in any one of claims 1-6.

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