Water path cooling structure of engine

Abstract

The invention discloses an engine waterway cooling structure which is characterized in that a water pump assembly is mounted on the outer side of a cylinder head, a cooling water pipe of the cylinder head is connected with the water pump assembly, a circulating outlet of the water pump assembly is connected with a thermostat, a water outlet of the thermostat is connected with a water outlet pipe, and the water outlet pipe is communicated with a water inlet of a radiator; a water outlet of the radiator communicates with the water pump assembly through a water return pipe, and a pump outlet of the water pump assembly is further connected with a cooling water pipe communicating with the air cylinder body. The engine cooling system has the beneficial effects that the thermostat is arranged in the water pump, cooling water flowing through the air cylinder body and the air cylinder head flows into the water pump after being heated, the thermostat guides water flow to enter the water pump to be circularly heated or enter the radiator to be cooled according to the water temperature, so that the engine is cooled, and when the water temperature is low, the cooling water can be rapidly heated, and when the water temperature is high, the cooling water can be rapidly cooled. And the temperature can be quickly reduced, so that the engine always works in a set temperature interval, ideal gaps are further kept between parts, and abnormal wear and impact are avoided.

Description

Technical Field

[0001] The invention relates to a cooling water circuit of a motorcycle engine, in particular to an engine water circuit cooling structure. Background Art

[0002] As an indispensable and important part of water-cooled engines, the thermostat is usually placed on the cylinder head. Due to the large size of the thermostat and its external shell, it takes up a lot of space. For engines with larger displacement, there is still space to place it on the cylinder head. For small and medium displacement engines, the installation space is limited and the thermostat cannot be placed on the cylinder head.

[0003] After long-term research, the inventor has designed a structure for installing a thermostat on the outside of a small-displacement engine, and based on the structure, proposed an engine water circuit cooling structure. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide an engine water circuit cooling structure.

[0005] The objective of the present invention is achieved through the following technical scheme: an engine water circuit cooling structure, comprising an engine block, on which a cylinder head, a cylinder block, a water pump assembly and a radiator are mounted, a water pump assembly is mounted on the outer side of the cylinder head, and a cooling water pipe of the cylinder head is connected to the water pump assembly, a thermostat is mounted on the water pump assembly, a water outlet of the thermostat is connected to a water outlet pipe, the water outlet pipe is connected to a water inlet of the radiator, the water outlet of the radiator is connected to the water pump assembly through a return pipe, the pump outlet of the water pump assembly is also connected to a cooling water pipe, and the cooling water pipe is connected to the cylinder block.

[0006] Optionally, the water pump assembly includes a pump body and a pump cover, the pump body is mounted on the side wall of the cylinder head, the pump cover is mounted on the pump body, and an impeller chamber is formed between the pump cover and the pump body, the cooling water pipe of the cylinder head is connected to the impeller chamber in the pump body, a water pump impeller is installed in the impeller chamber, and the water outlet of the impeller chamber is connected to the cooling water pipe.

[0007] Optionally, a side channel connected to the thermostat is provided on the pump cover, and the outlet of the return pipe is connected to the inner cavity of the thermostat through the side channel.

[0008] Optionally, a sealing gasket is arranged between the cylinder head and the cylinder body, and a first water jacket is provided in the cylinder head, a second water jacket is provided on the cylinder body, a through hole is opened on the sealing gasket, and cooling water on the second water jacket enters the water jacket of the cylinder head through the through hole on the sealing gasket.

[0009] Optionally, the radiator has an upper water chamber and a lower water chamber, the water outlet pipe is connected to the upper water chamber, the water return pipe is connected to the lower water chamber, the upper water chamber and the lower water chamber are connected through a flat tube, and the side wall of the flat tube is welded with a heat sink.

[0010] Optionally, the heat sink is made of metal foil.

[0011] Optionally, a magneto rotor is mounted on the crankshaft between the radiator and the engine, and a fan impeller is mounted on the end surface of the magneto rotor.

[0012] The present invention has the following advantages: the engine water circuit cooling structure of the present invention has a simple structure, a thermostat is arranged in the water pump, the cooling water flowing through the cylinder block and the cylinder head flows into the water pump after being heated, and the thermostat guides the water flow into the water pump for circulation heating or into the radiator for heat dissipation and cooling according to the water temperature, thereby realizing the cooling of the engine, and when the water temperature is low, the cooling water can be quickly heated up, and when the water temperature is high, it can be quickly cooled down, so that the engine always works in the set temperature range, thereby maintaining an ideal gap between parts to avoid abnormal wear and impact. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 The structure of the present invention is schematically shown Figure 1 ;

[0014] Figure 2 The structure of the present invention is schematically shown Figure 2 ;

[0015] Figure 3 The structure of the present invention is schematically shown Figure 3 ;

[0016] Figure 4 The structure of the present invention is schematically shown Figure 4 ;

[0017] Figure 5 The structure of the present invention is schematically shown Figure 5 ;

[0018] Figure 6 The structure of the present invention is schematically shown Figure 6 ;

[0019] Figure 7 for Figure 6 Schematic cross-sectional view of AA in the figure;

[0020] In the figure, 1-cylinder head, 2-cylinder block, 3-water pump assembly, 4-radiator, 5-thermostat, 6-water outlet pipe, 7-water return pipe, 8-cooling water pipe, 9-engine cylinder block, 11-pump body, 12-pump cover, 13-impeller chamber, 14-water pump impeller, 15-side channel, 16-sealing gasket, 17-upper water chamber, 18-lower water chamber, 19-flat tube, 20-heat sink, 21-magneto rotor, 22-fan impeller, 23-crankshaft. DETAILED DESCRIPTION

[0021] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0022] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention claimed for protection, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features of the embodiments may be combined with each other.

[0024] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0025] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, or the positions or positional relationships in which the product of the invention is usually placed when in use, or the positions or positional relationships commonly understood by those skilled in the art, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0026] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0027] like Figure 1 to Figure 6As shown, an engine water circuit cooling structure includes an engine cylinder block 9, on which a cylinder head 1, a cylinder block 2, a water pump assembly 3 and a radiator 4 are installed, the water pump assembly 3 is installed on the outer side of the cylinder head 1, and the cooling water pipe of the cylinder head 1 is connected to the water pump assembly 3, a thermostat 5 is installed on the water pump assembly 3, the water outlet of the thermostat 5 is connected to a water outlet pipe 6, the water outlet pipe 6 is connected to the water inlet of the radiator 4, the water outlet of the radiator 4 is connected to the water pump assembly 3 through a return pipe 7, and the pump outlet of the water pump assembly 3 A cooling water pipe 8 is also connected, and the cooling water pipe 8 is connected to the cylinder block 2. After the cooling water flows through the cylinder block 2 and the cylinder head 1, the cooling water is heated and flows into the water pump assembly 3. The thermostat 5 guides the water flow to enter the water pump for circulation and heating or to enter the radiator 4 for heat dissipation and cooling according to the water temperature, and then enters the heat source of the engine to take away the heat. Therefore, when the water temperature is low, the cooling water can heat up quickly, and when the water temperature is high, it can cool down quickly, so that the engine always works in the set temperature range, and the ideal gap is maintained between the parts to avoid abnormal wear and impact.

[0028] In this embodiment, if Figure 1 to Figure 6 As shown, the water pump assembly 3 includes a pump body 11 and a pump cover 12. The pump body 11 is mounted on the side wall of the cylinder head 1, and the pump cover 12 is mounted on the pump body 11, so that an impeller chamber 13 is formed between the pump cover 12 and the pump body 11. The cooling water pipe of the cylinder head 1 is communicated with the impeller chamber 13 in the pump body 11. A water pump impeller 14 is installed in the impeller chamber 13, and the water outlet of the impeller chamber 13 is communicated with the cooling water pipe 8. The cooling water enclosed in the water path enters the water pump outlet joint of the impeller chamber 13 under the drive of the water pump impeller 14 and the guidance of the impeller chamber 13, and then enters the water jacket of the cylinder body 2 through the cooling water pipe 8. The cooling water in the cylinder body 2, takes away the heat on the wall of the cylinder block 2, and the water temperature rises. Further, a sealing gasket 16 is arranged between the cylinder head 1 and the cylinder block 2, and the cylinder head 1 has a first water jacket, and the cylinder block 2 has a second water jacket. The sealing gasket 16 is provided with a through hole. The cooling water on the second water jacket enters the water jacket of the cylinder head 1 through the through hole on the sealing gasket 16. The cooling water enters the first water jacket of the cylinder head 1 through the through hole on the sealing gasket 16, and takes away the heat of the water jacket wall of the cylinder head 1 again, so that the water temperature rises again. Then, the heated cooling water enters the impeller chamber 13 of the water pump assembly 3 from the water outlet of the cylinder head 1.

[0029] In this embodiment, if Figure 2 , Figure 3As shown, a side channel 15 connected to the thermostat 5 is provided on the pump cover 12, and the outlet of the return pipe 7 is connected to the inner cavity of the thermostat 5 through the side channel 15. In this embodiment, the thermostat 5 is a commercially available product, and a valve is installed in the cavity of the thermostat 5. When the temperature rises, the paraffin filled in the thermostat 5 expands due to the heat and pushes open the valve plate. At this time, the inner cavity of the thermostat 5 is connected to the water outlet pipe 6. At this time, another valve plate on the thermostat 5 closes the side channel 15 to prevent the liquid in the inner cavity of the thermostat 5 from entering the impeller cavity 13 through the side channel 15. Further, a water inlet is provided on the thermostat 5, and the water inlet is connected to the cylinder head 1 That is to say, the liquid coming out of the cylinder head 1 enters the cavity of the thermostat 5, and then the thermostat 5 guides the water flow to enter the water pump for circulation heating or enter the radiator 4 for heat dissipation and cooling according to the water temperature before entering the heat source of the engine to take away the heat. Therefore, the cooling structure has two circulation channels, among which the small circulation channel includes the cylinder body 2, the thermostat 5, the cylinder head 1 and the water pump assembly 3. The cooling water enters the cylinder head 1 through the cylinder body 2, and then enters the thermostat 5 from the cylinder head 1, and then enters the water pump assembly 3 through the side channel, and finally enters the cylinder body 2 through the cooling water pipe 8, and enters A small circulation channel is formed. When the cooling water temperature is lower than the set stability, the valve plate on the thermostat 5 near the outlet pipe 6 is closed, that is, the inner cavity of the thermostat 5 is not connected with the outlet pipe 6, and the cooling water can only enter the small circulation channel. Therefore, the cooling water will be heated repeatedly, and the cooling water will heat up rapidly. When the cooling water temperature rises, the paraffin filled in the thermostat 5 expands due to the heat, and the valve plate is pushed open. The inner cavity of the thermostat 5 is connected with the outlet pipe 6, and the side channel 15 is blocked. The heated cooling water enters the large circulation channel. In this embodiment, the large circulation channel includes a water pump assembly 3, a thermostat 5, an outlet pipe 6, a radiator 4, a return pipe 7, and a water pump assembly. The cooling water from the cylinder head 1 enters the cavity of the thermostat 5, then enters the radiator 4 through the water outlet pipe 6, and then enters the impeller cavity 13 through the water return pipe 7. Under the action of the water pump impeller 14, it enters the cylinder body 2 through the cooling water pipe 8, and then enters the cylinder head 1, and finally enters the cavity of the thermostat 5 to participate in the circulation, so that the cooling water circulates in the large circulation channel, continuously taking away the heat of the engine, so that the engine is always in an ideal temperature state, protecting the engine from loss of performance due to high temperature, and more seriously damaging the engine.

[0030] In this embodiment, if Figure 7As shown, the radiator 4 has an upper water chamber 17 and a lower water chamber 18, the water outlet pipe 6 is connected to the upper water chamber 17, the water return pipe 7 is connected to the lower water chamber 18, the upper water chamber 17 and the lower water chamber 18 are connected through a flat tube 19, and a heat sink 20 is welded to the side wall of the flat tube 19. The cooling water first flows into the upper water chamber 17 of the radiator 4, and then flows into the flat tube 19 connected between the upper water chamber 17 and the lower water chamber 18. When the cooling water flows through the flat tube 19, the heat is transferred to the flat tube 19 and then to the heat sink 20. Preferably, the heat sink 20 is made of metal foil. A magneto rotor 21 is installed on a crankshaft 23 between the radiator 4 and the engine. The end of the magneto rotor 21 A fan impeller 22 is installed on the surface, and the fan impeller 22 rotates with the crankshaft 23 to blow the air in the engine cylinder 9 away from the engine, and a low-pressure area is formed in the radiator 4. Cold air flows into the radiator 4 from the gaps between the fins 20 of the radiator 4 for replenishment, and circulates continuously. When the cold air flows through the radiator 4, it will take away heat, thereby reducing the temperature of the flat tube 19 and then cooling the cooling water. The cooled cooling water flows into the return pipe 7 and enters the water pump assembly 3 for recirculation, thereby continuously taking away the heat of the engine, so that the engine is always in an ideal temperature state, protecting the engine from loss of performance due to high temperature, and more seriously damaging the engine.

[0031] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. An engine water circuit cooling structure, comprising an engine cylinder block, on which a cylinder head, a cylinder block, a water pump assembly and a radiator are mounted, characterized in that: The water pump assembly is installed on the outside of the cylinder head, and the cooling water pipe of the cylinder head is connected to the water pump assembly. A thermostat is installed on the water pump assembly. The water outlet of the thermostat is connected to a water outlet pipe, and the water outlet pipe is connected to the water inlet of the radiator. The water outlet of the radiator is connected to the water pump assembly through a return pipe. The pump outlet of the water pump assembly is also connected to a cooling water pipe, and the cooling water pipe is connected to the cylinder body.

2. The engine water cooling structure according to claim 1, characterized in that: The water pump assembly includes a pump body and a pump cover, wherein the pump body is mounted on the side wall of the cylinder head, and the pump cover is mounted on the pump body so that an impeller cavity is formed between the pump cover and the pump body, a cooling water pipe of the cylinder head is connected to the impeller cavity in the pump body, a water pump impeller is installed in the impeller cavity, and a water outlet of the impeller cavity is connected to the cooling water pipe.

3. The engine water cooling structure according to claim 2, characterized in that: The pump cover is provided with a side channel connected to the thermostat, and the outlet of the return pipe is connected to the inner cavity of the thermostat through the side channel.

4. An engine water circuit cooling structure according to any one of claims 1 to 3, characterized in that: A sealing gasket is arranged between the cylinder head and the cylinder body, and a first water jacket is arranged in the cylinder head, a second water jacket is arranged on the cylinder body, a through hole is opened on the sealing gasket, and cooling water on the second water jacket enters into the water jacket of the cylinder head through the through hole on the sealing gasket.

5. An engine water cooling structure according to any one of claims 1 to 3, characterized in that: The radiator has an upper water chamber and a lower water chamber, the water outlet pipe is connected to the upper water chamber, the water return pipe is connected to the lower water chamber, the upper water chamber and the lower water chamber are connected through a flat tube, and the side wall of the flat tube is welded with a heat sink.

6. The engine water cooling structure according to claim 5, characterized in that: The heat sink is made of metal foil.

7. The engine water cooling structure according to claim 5, characterized in that: A magneto rotor is installed on the crankshaft between the radiator and the engine, and a fan impeller is installed on the end surface of the magneto rotor.

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