Built-in cooling water channel of engine and motorcycle engine with built-in cooling water channel

Abstract

The utility model relates to the technical field of motorcycle engines, and discloses a built-in cooling water path of an engine, which comprises a water pump cover water path, a right cover water path, a crankcase water path, a cylinder body water path and a thermostat cover water path which are communicated in sequence, and is characterized in that the water pump cover water path is of a bent structure; the bent position of the water pump cover water path is communicated through a first flow guide inclined channel, and the crankcase water path is communicated with the cylinder body water path through a second flow guide inclined channel. The utility model further relates to a motorcycle engine provided with the built-in cooling water channel. Use of external water pipes is reduced, waterway resistance is reduced, and the heat dissipation effect of the engine is improved.

Description

Technical Field

[0001] This utility model relates to the field of motorcycle engine technology, specifically to an engine's built-in cooling water circuit and its motorcycle engine. Background Technology

[0002] The cooling water circuit is the core component of the engine's water cooling system. The coolant flowing inside absorbs the heat generated by the combustion chamber and friction (about 30%-40% of the fuel energy is converted into heat energy) by contacting the high-temperature cylinder block, cylinder head and other components, preventing the metal parts from expanding or deforming due to high temperature.

[0003] Chinese patent document CN114109641B discloses a cooling water channel structure for a motorcycle engine, including a cylinder block with a piston bore. The cylinder block is provided with a cylinder block water jacket that surrounds the piston bore circumferentially. The lower end of the cylinder block is connected to a crankcase housing, and the side of the crankcase housing is connected to a crankcase cover. The key feature is that the cylinder block is provided with an inlet channel, one end of which is tangentially connected to the cylinder block water jacket, and the other end extends to the crankcase housing. The crankcase housing and the crankcase cover are formed with water inlet channels, the inner end of which is connected to the inlet channel, and the other end extends to the outside of the crankcase cover.

[0004] Chinese patent document CN207393300U discloses an all-terrain engine built-in water channel mechanism, including a cylinder head, a cylinder block, and a crankcase left housing with a crankcase left cover arranged sequentially from top to bottom. Water channel sections are provided in the cylinder head, cylinder block, crankcase left housing, and crankcase left cover, and the water channel sections are connected sequentially to form a circulating water channel. A water pump is provided in the crankcase left housing, and a water pump cover is provided on the crankcase left cover. Inlet pipe and outlet pipe communicating with the circulating water channel are respectively provided on the water pump cover and the cylinder head.

[0005] The existing technology CN207393300U discloses an all-terrain engine built-in water channel mechanism with the following shortcomings: the flow rate of cooling water in the built-in water channel is slow, and the engine heat dissipation effect is poor. Utility Model Content

[0006] To address the technical problem of poor engine cooling performance, this utility model provides an internal cooling water circuit for an engine, comprising a water pump cover water circuit, a right cover water circuit, a crankcase water circuit, a cylinder block water circuit, and a thermostat cover water circuit connected in sequence. The water pump cover water circuit has a bent structure, with the bend connected via a first inclined guide channel, and the crankcase water circuit connected to the cylinder block water circuit via a second inclined guide channel.

[0007] To further reduce the resistance of the water passage, the cross-sectional area at the connection between the right cover water passage and the crankcase water passage is larger than the cross-sectional area between the right cover water passage and the crankcase water passage. This ensures that after the crankcase water passage is die-cast, the cross-sectional area at its end will not obstruct the flow of water. The entire water passage is formed by casting without machining, thus avoiding the risk of water entering the casting shrinkage cavity.

[0008] Furthermore, the connection between the right cover water passage and the water pump cover water passage is a bent structure, and the connection between the right cover water passage and the water pump cover water passage and the crankcase water passage is a smooth transition.

[0009] To avoid the generation of eddies, the water pump cover includes an inlet water passage and an outlet water passage, with a guide plate installed at the end of the inlet water passage.

[0010] To facilitate the drainage of coolant from the entire water circuit, a drain trough is provided at the lowest point of the water pump cover water circuit.

[0011] To reduce the use of external water pipes and improve overall compactness, the right cover water passage is set along the edge of the right cover, the outlet of the crankcase water passage is set near the crankcase exhaust labyrinth, and the outer surface of the crankcase water passage is coplanar with the crankcase exhaust labyrinth.

[0012] A motorcycle engine includes a water pump cover, a water pump assembly, a right cover, a crankcase, a cylinder block, a cylinder head, a thermostat, and a thermostat cover. The engine interior includes the built-in cooling water passages; the water pump cover contains the water pump cover water passages; the right cover contains the right cover water passages; the crankcase contains the crankcase water passages; the right cover water passages and the crankcase water passages are arranged along the edge of the right cover and the chain cavity; the cylinder block contains the cylinder block water passages; and the thermostat cover contains the thermostat cover water passages.

[0013] Preferably, an annular cylinder body water jacket and a cylinder head water jacket are respectively provided in the cylinder body and the cylinder head water jacket. The annular cylinder body water jacket and the cylinder head water jacket are connected through the guide hole of the cylinder head sealing gasket. The thermostat and thermostat cover are installed at the highest point of the cylinder head water jacket and at the outlet position on the other side of the chain cavity.

[0014] Preferably, the water pump assembly is installed in the upper right corner of the right cover. The water pump assembly is connected to the water pump gear, which is driven by the oil pump drive gear, reducing the internal space of the engine. At the same time, the number of teeth of the water pump gear can be adjusted within a certain range to adjust the water pump transmission ratio and adjust the matching water pump volume within a certain range.

[0015] This utility model has the following beneficial effects:

[0016] 1. In existing technologies, cooling water channels in engines inevitably need to bend and deviate to meet heat dissipation requirements while avoiding interference with the installation of internal engine equipment. This invention, however, effectively reduces water flow resistance and increases coolant flow rate through the bend structure of the water pump cover's water channels, the inclined guide channel, and the smooth transition design. This allows the coolant to quickly absorb and remove heat from critical engine components (such as the cylinder block and cylinder head), significantly improving heat dissipation.

[0017] 2. Compared with the prior art, this utility model significantly reduces the use of external water pipes by integrating cooling water circuits inside components such as the right cover and crankcase, simplifies the overall structure, improves the compactness and appearance coordination of the engine, and reduces the risk of failure caused by aging or leakage of external water pipes. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the internal cooling water circuit of the engine in Example 1;

[0019] Figure 2 This is a schematic diagram of the water circuit in the pump cover of Example 1;

[0020] Figure 3 This is a schematic diagram of the motorcycle engine in Example 2;

[0021] Figure 4 This is a schematic diagram of the cylinder head sealing gasket in Example 2. Detailed Implementation

[0022] The following detailed description illustrates the specific implementation method:

[0023] The reference numerals in the accompanying drawings of the instruction manual include: 1. Water pump cover; 1-1. Water pump cover water passage; 1-1-1. Baffle plate; 1-1-2. Drain trough; 1-1-3. Inlet water passage; 1-1-4. Outlet water passage; 2. Water pump assembly; 3. Right cover; 3-1. Right cover water passage; 3-1. Flow guide inclined channel one; 3-1-1. Crankcase; 4. Crankcase water passage; 4-1. Crankcase exhaust labyrinth; 4-2. Cylinder block; 5. Annular cylinder block water jacket; 5-1. Flow guide inclined channel two; 5-1-1. Drain bolt hole; 5-1-2. Cylinder head gasket; 6. Flow guide hole; 6-1. Cylinder head; 7. Cylinder head water jacket; 7-1. Thermostat; 8. Thermostat cover; 9. Thermostat cover water passage; 9-1. Rounded corner; 10. Cylinder block water passage; 11. Chain chamber; 12. Water pump gear; 13.

[0024] Example 1

[0025] like Figure 1 and 2As shown, an engine's internal cooling water circuit includes a water pump cover water circuit 1-1, a right cover water circuit 3-1, a crankcase water circuit 4-1, a cylinder block water circuit 11, and a thermostat cover water circuit 9-1 connected in sequence. The water pump cover water circuit 1-1 has a bent structure, and the bend of the water pump cover water circuit 1-1 is connected through a first guide inclined channel 3-1-1. The crankcase water circuit 4-1 is connected to the cylinder block water circuit 11 through a second guide inclined channel 5-1-1.

[0026] The cross-sectional area at the connection between the right cover water passage 3-1 and the crankcase water passage 4-1 is larger than the cross-sectional area of ​​both the right cover water passage 3-1 and the crankcase water passage 4-1. This ensures that after the crankcase water passage 4-1 is die-cast, the cross-sectional area at its end will not obstruct the flow of water. The entire water passage is formed by casting without machining, thus avoiding the risk of water entering the casting shrinkage cavity.

[0027] The connection between the right cover water passage 3-1 and the water pump cover water passage 1-1 is a bent structure, and the connection between the right cover water passage 3-1 and the water pump cover water passage 1-1 and the crankcase water passage 4-1 is transitioned by a fillet 10.

[0028] The water pump cover water passage 1-1 includes an inlet water passage 1-1-3 and an outlet water passage 1-1-4, and a guide plate 1-1-1 is provided at the end of the inlet water passage 1-1-3.

[0029] A water discharge trough 1-1-2 is provided at the lowest point of the water pump cover water passage 1-1.

[0030] The right cover water passage 3-1 is arranged along the edge of the right cover 3, and the outlet of the crankcase water passage 4-1 is located near the crankcase exhaust gas labyrinth 4-2. The outer surface of the crankcase water passage 4-1 is coplanar with the crankcase exhaust gas labyrinth 4-2. This spatial layout is highly efficient, making full use of the engine's internal space, reducing interference with other components, and further optimizing the overall compactness of the layout.

[0031] Example 2

[0032] like Figures 1-4As shown, a motorcycle engine includes a water pump cover 1, a water pump assembly 2, a right cover 3, a crankcase 4, a cylinder block 5, a cylinder head gasket 6, a cylinder head 7, a thermostat 8, and a thermostat cover 9. The water pump cover 1 is connected to the right cover 3, and the water pump assembly 2 is mounted on the right cover 3. The engine has an internal cooling water circuit as described in Embodiment 1. The water pump cover 1 has a water pump cover water circuit 1-1, and the right cover 3 has a right cover water circuit 3-1. The water pump cover water circuit 1-1 and the right cover water circuit 3-1 are aligned in position and interface. The crankcase 4 has a crankcase water circuit 4-1. The right cover water circuit 3-1 and the crankcase water circuit 4-1 are arranged along the edge of the right cover 3 and the chain cavity 12. The cylinder block 5 has a cylinder block water circuit 11, and the thermostat cover 9 has a thermostat cover water circuit 9-1.

[0033] The cylinder block 5 and cylinder head 7 are respectively provided with annular cylinder block water jacket 5-1 and cylinder head water jacket 7-1. The annular cylinder block water jacket 5-1 and cylinder head water jacket 7-1 form the cylinder block water passage 11. The annular cylinder block water jacket 5-1 and cylinder head water jacket 7-1 are connected through the guide hole 6-1 of the cylinder head sealing gasket 6. The inlet of the annular cylinder block water jacket 5-1 is aligned with the crankcase water passage 4-1. There is a guide inclined channel 5-1-1 at the position of entering the annular cylinder block water jacket 5-1 to reduce the resistance of the water passage. The annular cylinder block water jacket 5-1 and cylinder head water jacket 7-1 are connected through the guide hole 6-1 on the cylinder head sealing gasket 6. The guide hole 6-1 is mainly distributed on the intake side and the chain cavity 12 side. At the same time, the outlet of the cylinder head water jacket 7-1 is located on the other side relative to the chain cavity 12, so that the water flow is distributed around the chain cavity 12, thereby improving the cooling effect. The thermostat 8 and thermostat cover 9 are installed at the highest point of the cylinder head water jacket 7-1 and at the outlet position on the other side opposite to the chain cavity 12.

[0034] The water pump assembly 2 is installed at the upper right corner of the right cover 3. The water pump assembly 2 is connected to the water pump gear 13. The water pump gear 13 is driven by the oil pump drive gear. The oil pump is a conventional device and is not shown in the figure. This reduces the internal space of the engine. At the same time, the number of teeth of the water pump gear 13 can be adjusted within a certain range to adjust the water pump transmission ratio and adjust the matching water volume within a certain range.

[0035] The lowest point of the water pump cover water passage 1-1 has a drain trough 1-1-2, and the lowest point of the annular cylinder water jacket 5-1 has a drain bolt hole 5-1-2. The drain trough 1-1-2 and the drain bolt hole 5-1-2 are sealed by bolts and copper gaskets, which facilitates the drainage of coolant from the entire water passage.

[0036] The above descriptions are merely embodiments of this utility model. Commonly known structures and characteristics are not described in detail here. Those skilled in the art are aware of all common technical knowledge in the field prior to the application date or priority date, are knowledgeable of all existing technologies in that field, and possess the ability to apply conventional experimental methods prior to that date. Therefore, those skilled in the art can, based on the guidance provided in this application, improve and implement this solution in conjunction with their own capabilities. Typical known structures or methods should not be obstacles for those skilled in the art to implement this application. It should be noted that those skilled in the art can make several modifications and improvements without departing from the structure of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. An internal cooling water system for an engine, comprising a water pump cover water system, a right cover water system, a crankcase water system, a cylinder block water system, and a thermostat cover water system connected in sequence, characterized in that, The water pump cover water passage has a bent structure, and the bend in the water pump cover water passage is connected through a first guide inclined channel. The crankcase water passage is connected to the cylinder block water passage through a second guide inclined channel.

2. The built-in cooling water circuit of the engine according to claim 1, characterized in that: The cross-sectional area at the connection between the right cover water passage and the crankcase water passage is larger than the cross-sectional area between the right cover water passage and the crankcase water passage.

3. The built-in cooling water circuit of the engine according to claim 2, characterized in that: The connection between the right cover water passage and the water pump cover water passage is a bent structure, and the connection between the right cover water passage and the water pump cover water passage and the crankcase water passage is a smooth transition.

4. The built-in cooling water circuit of the engine according to claim 3, characterized in that: The water pump cover includes an inlet water path and an outlet water path, with a guide plate installed at the end of the inlet water path.

5. The built-in cooling water circuit of the engine according to claim 4, characterized in that: A drain trough is provided at the lowest point of the water channel of the pump cover.

6. The built-in cooling water circuit of the engine according to claim 5, characterized in that: The right cover water passage is arranged along the edge of the right cover, the outlet of the crankcase water passage is located near the crankcase exhaust gas labyrinth, and the outer surface of the crankcase water passage is coplanar with the crankcase exhaust gas labyrinth.

7. A motorcycle engine employing the built-in cooling water circuit as described in any one of claims 1-6, comprising a water pump cover, a water pump assembly, a right cover, a crankcase, a cylinder block, a cylinder head, a thermostat, and a thermostat cover, characterized in that, The engine includes a built-in cooling water circuit, with a water pump cover water circuit inside the water pump cover, a right cover water circuit inside the right cover, a crankcase water circuit inside the crankcase, the right cover water circuit and the crankcase water circuit arranged along the edge of the right cover and the chain cavity, a cylinder block water circuit inside the cylinder body, and a thermostat cover water circuit inside the thermostat cover.

8. The motorcycle engine according to claim 7, characterized in that: The cylinder body and cylinder head are respectively provided with annular cylinder body water jacket and cylinder head water jacket. The annular cylinder body water jacket and cylinder head water jacket are connected through the flow guide hole of the cylinder head sealing gasket. The thermostat and thermostat cover are installed at the highest point of the cylinder head water jacket and at the outlet position on the other side of the chain cavity.

9. The motorcycle engine according to claim 8, characterized in that: The water pump assembly is installed at the upper right corner of the right cover. The water pump assembly is connected to the water pump gear, which is driven by the oil pump drive gear.

Images