An engine cooling system, an engine assembly, and a vehicle

Abstract

The utility model provides a kind of engine cooling system, engine assembly and vehicle, it is related to vehicle parts technical field.The engine cooling system includes engine water jacket, thermostat, oil cooler, radiator and pump, the thermostat is configured as the structure form of single outlet, the engine water jacket, the thermostat, the radiator and the pump intercommunication constitute first circulation loop, the engine water jacket, the oil cooler and the pump intercommunication constitute second circulation loop;After engine starts, when the thermostat senses coolant temperature is lower than preset threshold value, only the coolant of second circulation loop flows, realize small circulation heat dissipation;When the thermostat senses coolant temperature reaches or higher than preset threshold value, the coolant of first circulation loop and second circulation loop flows, realize large circulation heat dissipation.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts technology, specifically to an engine cooling system, an engine assembly, and a vehicle. Background Technology

[0002] The thermostat is an indispensable and crucial component in a vehicle's engine cooling system, playing a vital role. Within the engine cooling system, the thermostat precisely regulates the flow of coolant in the internal and external circulation channels to achieve adequate cooling of the engine, ensuring it remains within a suitable operating temperature range. During the initial engine startup, the thermostat allows the coolant to circulate within the engine, aiding in rapid warm-up and preventing localized overheating in the cylinder block and cylinder head. When the engine temperature rises excessively, the thermostat promptly opens the large circulation channel, allowing coolant to flow through the radiator to dissipate excess heat generated during continuous engine operation, ensuring all vehicle components operate in a suitable environment.

[0003] In related technologies, the conventional approach is to connect the bypass outlet of the thermostat directly to the water pump inlet via a pipeline. When the coolant temperature is low and the main outlet of the thermostat is not yet open, the coolant will flow between the water pump, engine water jacket, and thermostat to form a small circulation loop, achieving initial preheating and temperature regulation of the engine. However, in the actual architecture of the engine cooling system, additional heater loops, oil cooler loops, and cooling EGR (Exhaust Gas Recirculation) loops are usually set up. These loops are mostly designed in parallel with the small circulation loops, that is, a separate pipeline is set up for each functional requirement. Although this satisfies the cooling needs of different components to a certain extent, it also results in a large number of pipelines. Utility Model Content

[0004] The problem solved by this invention is how to simplify the piping of the engine cooling system.

[0005] To address the aforementioned problems, this utility model provides an engine cooling system, an engine assembly, and a vehicle.

[0006] In a first aspect, the present invention provides an engine cooling system, including an engine water jacket, a thermostat, an oil cooler, a radiator, and a pump. The thermostat is configured with a single liquid outlet. The engine water jacket, the thermostat, the radiator, and the pump are connected to form a first circulation loop, and the engine water jacket, the oil cooler, and the pump are connected to form a second circulation loop. After the engine starts, when the thermostat senses that the coolant temperature is lower than a preset threshold, only the coolant in the second circulation loop flows to achieve small-loop heat dissipation; when the thermostat senses that the coolant temperature reaches or exceeds the preset threshold, the coolant in both the first and second circulation loops flows to achieve large-loop heat dissipation.

[0007] Furthermore, the inlet of the thermostat and the inlet of the oil cooler are respectively connected to the same side of the engine water jacket and are set corresponding to adjacent cylinder bores.

[0008] Furthermore, both the thermostat and the oil cooler are connected to the engine block.

[0009] Furthermore, the thermostat includes a sensor configured to drive the thermostat to open when the coolant temperature reaches or exceeds a preset threshold; the sensor protrudes from the thermostat housing, and after the thermostat is connected to the engine block, the sensor extends into the engine water jacket.

[0010] Furthermore, the engine water jacket includes a cylinder block water jacket, which is arranged around the outer side of the cylinder bore group of the engine. The cylinder bore group includes a first cylinder bore, a second cylinder bore, a third cylinder bore, and a fourth cylinder bore arranged in sequence. A partition structure is provided on one side between the first cylinder bore and the second cylinder bore, and the partition structure is used to isolate the cylinder block water jacket. The inlet of the thermostat is connected to the cylinder water jacket on one side of the third cylinder bore; the inlet of the oil cooler is connected to the cylinder water jacket on one side of the second cylinder bore; and the outlet of the pump is connected to the cylinder water jacket on one side of the first cylinder bore.

[0011] Furthermore, the engine cooling system also includes an EGR cooler, the inlet of which is connected to the cylinder block water jacket on the other side of the third cylinder bore, and the outlet of which is connected to the pump inlet. And / or, the engine cooling system further includes a heater core, wherein the inlet of the heater core is connected to the outlet of the cylinder head water jacket at the location corresponding to the fourth cylinder bore, and the outlet of the heater core is connected to the inlet of the pump.

[0012] Optionally, the thermostat includes a thermostat body, the thermostat body has a flow channel inside, one end of the flow channel is used to communicate with the radiator, the other end of the flow channel is used to communicate with the engine water jacket, and the other end is provided with a temperature sensing valve assembly for controlling the opening and closing of the flow channel. The temperature sensing valve assembly also includes a bracket connected to the thermostat body. The bracket includes an upper bracket, a lower bracket, and a valve seat. The valve seat is located at the other end of the flow channel. The upper bracket is located inside the thermostat body, and the lower bracket is located outside the thermostat body. The sensor is located between the valve seat and the lower bracket. The thermostat body is provided with a connecting flange at the end corresponding to the valve seat, and the connecting flange is used to connect to the cylinder block sidewall of the engine.

[0013] Optionally, the temperature sensing valve assembly further includes a push rod, an elastic element, and a valve. One end of the push rod is connected to the upper bracket, and the other end is inserted into the sensing body. The two ends of the elastic element are elastically abutting against the lower bracket and the valve, respectively. The sensing body is configured to drive the valve to open against the elastic force of the elastic element when it senses that the coolant temperature has risen to a preset threshold range. The sensor includes a housing and a rubber sleeve disposed inside the housing. Paraffin wax is filled between the rubber sleeve and the housing, and the other end of the push rod is inserted into the rubber sleeve.

[0014] Secondly, this utility model provides an engine assembly, including an engine and the aforementioned engine cooling system.

[0015] Thirdly, this utility model provides a vehicle including the aforementioned engine assembly.

[0016] The beneficial effects of the engine cooling system of this utility model are: The thermostat employs a simplified flow channel design, featuring a single inlet and outlet. It controls only the opening and closing of the first circulation loop, eliminating the conventional design that utilizes the bypass outlet to create a smaller circulation loop. Instead, a second circulation loop is established, connected to the engine water jacket, oil cooler, and pump. In operation, after engine startup, when the thermostat senses a coolant temperature below a preset threshold, it remains closed, the first circulation loop is disconnected, and coolant flow ceases; only the coolant in the second circulation loop flows, achieving small-loop heat dissipation, as shown in the figure. When the thermostat senses a coolant temperature at or above the preset threshold, it opens, the first circulation loop is activated, and coolant flows in both the first and second circulation loops, achieving large-loop heat dissipation, as shown in the figure.

[0017] This engine cooling system uses an oil cooler as the carrier in parallel branches, replacing the original thermostat's small circulation loop. This design reduces complex and redundant piping, and by decreasing the number of parallel branches, the fluid flow rate is appropriately reduced to achieve better cooling. Furthermore, during engine startup, the oil cooler directly draws fluid from the engine's water jacket for a small circulation cooling system. This rapidly increases the internal oil temperature at low temperatures, reduces friction in the lubrication system, minimizes engine mechanical losses, and ultimately improves engine operating efficiency, achieving overall energy saving and emission reduction. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the engine cooling system according to an embodiment of the present invention.

[0019] Figure 2 This is a schematic diagram of the thermostat structure of the engine cooling system according to an embodiment of the present invention.

[0020] Figure 3 This is a partial cross-sectional view of the temperature sensing valve assembly of the engine cooling system according to an embodiment of the present invention.

[0021] Figure 4 This is a schematic diagram of the coolant flow during small-circulation heat dissipation in the engine cooling system of this embodiment.

[0022] Figure 5 This is a schematic diagram of the coolant flow during large-circulation heat dissipation in the engine cooling system of this embodiment.

[0023] Explanation of reference numerals in the attached figures: 1. Engine water jacket; 11. Cylinder block water jacket; 12. Cylinder head water jacket; 2. Thermostat; 21. Thermostat body; 22. Bracket; 221. Upper bracket; 222. Lower bracket; 223. Valve seat; 23. Push rod; 24. Elastic element; 25. Sensor; 251. Housing; 252. Rubber sleeve; 26. Valve; 3. Oil cooler; 4. Radiator; 5. Pump; 6. EGR cooler; 7. Heater core; 81. First cylinder bore; 82. Second cylinder bore; 83. Third cylinder bore; 84. Fourth cylinder bore. Detailed Implementation

[0024] To make the above-mentioned objects, features, and advantages of this utility model more apparent and understandable, specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings. Although some embodiments of this utility model are shown in the drawings, it should be understood that this utility model can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this utility model. It should be understood that the drawings and embodiments of this utility model are for illustrative purposes only and are not intended to limit the scope of protection of this utility model.

[0025] The term "comprising" and its variations as used herein are open-ended, meaning "including but not limited to"; the term "based on" means "at least partially based on"; the term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments"; and the term "optionally" means "optional embodiments". Definitions of other terms will be given in the following description. It should be noted that the concepts of "first," "second," etc., mentioned in this utility model are only used to distinguish different devices, modules, or units, and are not used to limit the order of functions performed by these devices, modules, or units or their interdependencies.

[0026] It should be noted that the terms "one" and "multiple" used in this utility model are illustrative rather than restrictive. Those skilled in the art should understand that, unless explicitly stated otherwise in the context, they should be understood as "one or more". "Several" refers to "one or more".

[0027] Heating loop: In order to achieve rapid heating of the cockpit, the coolant needs to bypass the radiator, exchange heat with the air through the heating core, and then flow back to the water pump inlet to ensure the cabin heating needs during cold start. Oil cooler circulation loop: In order to meet the requirements of oil temperature control, the coolant needs to flow through the oil cooler to heat the oil during cold start and cool the oil during normal operation. Then, it returns to the water pump through a dedicated pipeline to ensure that the oil is maintained in the optimal lubrication temperature range. Cooling EGR circulation loop: The coolant flows through the EGR cooler and then back, carrying away the heat from the EGR valve and the return intake system, thus achieving independent temperature control of the EGR system.

[0028] like Figure 1As shown, this embodiment of the invention provides an engine cooling system, including an engine water jacket 1, a thermostat 2, an oil cooler 3, a radiator 4, and a pump 5. The thermostat 2 is configured with a single outlet. The engine water jacket 1, thermostat 2, radiator 4, and pump 5 are connected to form a first circulation loop, and the engine water jacket 1, oil cooler 3, and pump 5 are connected to form a second circulation loop. After the engine starts, when the thermostat 2 senses that the coolant temperature is lower than a preset threshold, only the coolant in the second circulation loop flows, achieving small-loop heat dissipation; when the thermostat 2 senses that the coolant temperature reaches or exceeds the preset threshold, the coolant in both the first and second circulation loops flows, achieving large-loop heat dissipation.

[0029] In this embodiment, a simplified flow channel structure is adopted for the thermostat 2, which is configured with a single inlet and a single outlet. The thermostat 2 is only used to control the opening and closing of the first circulation loop, eliminating the conventional design that uses the bypass outlet of the thermostat 2 to form a small circulation loop. Instead, a second circulation loop is formed by connecting the engine water jacket 1, oil cooler 3, and pump 5. Specifically, after the engine starts, when the thermostat 2 senses that the coolant temperature is lower than a preset threshold, the thermostat 2 remains closed, the first circulation loop is disconnected and the coolant does not flow, only the coolant in the second circulation loop flows, achieving small-loop heat dissipation. Figure 4 As shown; when the thermostat 2 senses that the coolant temperature reaches or exceeds a preset threshold, the thermostat 2 opens, the first circulation loop is activated, meaning that coolant flows in both the first and second circulation loops, achieving large-loop heat dissipation, as shown. Figure 5 As shown.

[0030] This engine cooling system uses an oil cooler 3 as a carrier in the form of parallel branches, replacing the original small circulation loop of the thermostat 2. This reduces the complexity and redundancy of the piping design, and by reducing the number of parallel branches, the liquid flow rate is appropriately lowered to achieve better cooling. Furthermore, when the engine starts, the oil cooler 3 immediately draws liquid directly from the engine water jacket 1 for small-circulation heat dissipation. This can quickly raise the internal engine oil temperature at low temperatures, reduce friction work in the lubrication system, reduce engine mechanical losses, and thus improve engine operating efficiency, achieving overall energy saving and emission reduction.

[0031] It should be noted that the conventional structure of thermostat 2 is one inlet and two outlets, with the two outlets being the main outlet connected to radiator 4 and the bypass outlet connected to pump 5, respectively; while the thermostat 2 in this utility model is a single-valve structure with one inlet and one outlet.

[0032] Optionally, the inlet of the thermostat 2 is connected to the outlet of the engine water jacket 1, and the outlet of the thermostat 2 is connected to the inlet of the radiator 4; the inlet of the oil cooler 3 is connected to the outlet of the engine water jacket 1, and the outlet of the oil cooler 3 is connected to the inlet of the pump 5; the outlet of the radiator 4 is connected to the inlet of the pump 5, and the outlet of the pump 5 is connected to the inlet of the engine water jacket 1.

[0033] In this optional embodiment, the thermostat 2 is specifically connected as follows: the inlet of the thermostat 2 is connected to the outlet of the engine water jacket 1, and the outlet of the thermostat 2 is connected to the inlet of the radiator 4, thereby forming a first circulation loop. During engine operation, when the coolant flows through the engine water jacket 1, it absorbs the excess heat generated by the engine. Subsequently, the coolant flows through the thermostat 2, and when certain conditions are met, the circuit of the thermostat 2 opens, and the coolant flows into the radiator 4 to dissipate heat and reduce its own temperature. Finally, the coolant flows back to the pump 5, is pressurized by the pump 5, and is delivered back to the engine water jacket 1, thus forming a complete closed-loop cooling second circulation loop, which meets the temperature control requirements of the engine during normal operation.

[0034] In addition, the inlet of the oil cooler 3 is connected to the outlet of the engine water jacket 1. It should be noted that the outlets of the engine water jacket 1, oil cooler 3, and the aforementioned thermostat 2 are not the same. After the outlet of the oil cooler 3 and the outlet of the radiator 4 merge, they are connected to the inlet of the pump 5. Finally, the outlet of the pump 5 returns to the inlet of the engine water jacket 1 through a high-pressure pipeline, forming a complete closed-loop cooling cycle system.

[0035] Optionally, the inlet of the thermostat 2 and the inlet of the oil cooler 3 are respectively connected to the same side of the engine water jacket 1 and are set to the adjacent cylinder bores.

[0036] In this optional embodiment, the thermostat 2 and oil cooler 3 are designed with parallel circuits. By connecting their inlets to the same side of the engine water jacket 1 and corresponding to adjacent cylinder bores, their liquid intake points from the engine water jacket 1 are close. Therefore, when the second circulation circuit of the oil cooler 3 replaces the small circulation circuit of the thermostat 2 in related technologies, the overall change in the small circulation circuit of the coolant is small, and the impact on the small circulation heat dissipation function is minimal. Typically, both the thermostat 2 and oil cooler 3 are located on the intake side.

[0037] Optionally, such as Figure 1As shown, the engine water jacket 1 includes a cylinder block water jacket 11; the cylinder block water jacket 11 surrounds the outer side of the cylinder bore assembly of the engine, the cylinder bore assembly includes a first cylinder bore 81, a second cylinder bore 82, a third cylinder bore 83 and a fourth cylinder bore 84 arranged in sequence, a partition structure is provided on one side between the first cylinder bore 81 and the second cylinder bore 82, the partition structure is used to isolate the cylinder block water jacket 11; the inlet of the thermostat 2 is connected to the cylinder block water jacket 11 on the side of the third cylinder bore 83; the inlet of the oil cooler 3 is connected to the cylinder block water jacket 11 on the side of the second cylinder bore 82; the outlet of the pump 5 is connected to the cylinder block water jacket 11 on the side of the first cylinder bore 81.

[0038] In this optional embodiment, the engine water jacket 1 is formed by a cavity flow channel surrounding the outer side of the cylinder bore assembly. The cavity flow channel is disconnected by a partition structure on one side between the first cylinder bore 81 and the second cylinder bore 82, so that when the coolant flows along the engine water jacket 1, the flow path covers the entire outer area of ​​the four cylinders, ensuring better cooling effect.

[0039] The connection positions of each functional component to the cylinder water jacket 11 are clearly defined, as follows: the inlet of the thermostat 2 is connected to the cylinder water jacket 11 on the positive X-direction side of the third cylinder bore 83; the inlet of the oil cooler 3 is connected to the cylinder water jacket 11 on the positive X-direction side of the second cylinder bore 82; and the outlet of the pump 5 is connected to the cylinder water jacket 11 on the positive X-direction side of the first cylinder bore 81.

[0040] Based on the aforementioned connection points, the coolant forms an orderly circulation path within the cylinder block water jacket 11. The specific path is: one side of the first cylinder bore 81 → the other side of the first cylinder bore 81 → the other side of the second cylinder bore 82 → the other side of the third cylinder bore 83 → the other side of the fourth cylinder bore 84 → one side of the fourth cylinder bore 84 → one side of the third cylinder bore 83 → one side of the second cylinder bore 82. This path covers all X-direction forward and reverse areas of the four cylinders, ensuring sufficient contact between the coolant and the cylinder block, while also adapting to the coolant intake / supply requirements of each functional component.

[0041] In this engine cooling system, the outlet of pump 5 injects coolant into the first cylinder bore 81 side of the cylinder water jacket 11. Oil cooler 3 draws coolant from the second cylinder bore 82 side, and thermostat 2 draws coolant from the third cylinder bore 83 side. The coolant flow path between the inlet of oil cooler 3 and the outlet of pump 5 is long, allowing the coolant to fully exchange heat with all four cylinder bores within the engine water jacket 1 during small-circulation cooling, resulting in rapid and uniform engine warm-up. The third cylinder bore 83 is located in the middle of the cylinder block, where the temperature is higher. Furthermore, one side of the third cylinder bore 83 is far from the pump 5's supply end. The coolant has already undergone sufficient heat exchange here after circulating through all four cylinders. The thermostat 2 draws coolant from this location, ensuring both sufficient heat exchange between the new coolant and the cylinder block and preventing the accumulation of high-temperature coolant within the water jacket, thus guaranteeing the cooling effect of the first circulation loop.

[0042] It should be noted that the "side" mentioned above refers to one side in the first direction, where the first direction is defined as the direction perpendicular to the common plane of the axes of the cylinder bores of the cylinder bore group. In the first direction, the first cylinder bore 81, the second cylinder bore 82, the third cylinder bore 83, and the fourth cylinder bore 84 each have two opposing sides: one side and the other side. Specifically, in this utility model, one side of the engine refers to... Figure 1 The side shown is oriented towards the positive X-axis. This side of the engine can also be considered the engine intake side in the actual structure.

[0043] Optionally, the engine water jacket 1 includes a cylinder block water jacket 11 and a cylinder head water jacket 12, with the cylinder head water jacket 12 connected to the cylinder block water jacket 11. The cylinder head water jacket 12 covers the contact surfaces of the intake manifold and exhaust manifold, effectively controlling the temperature of the intake manifold and the cylinder head temperature around the exhaust manifold. The specific connection method between the cylinder head water jacket 12 and the cylinder block water jacket 11 is a conventional technology and will not be described in detail.

[0044] Optionally, the engine cooling system also includes an EGR cooler 6, the inlet of which is connected to the cylinder block water jacket 11 on the other side of the third cylinder bore 83, and the outlet of which is connected to the inlet of the pump 5.

[0045] In this optional embodiment, the EGR cooler 6 is connected to the third cylinder bore 83 region of the engine block water jacket 11, forming a cooling EGR circulation loop to reduce the temperature of the EGR valve and the gas returned to the intake system. Specifically, the EGR cooler 6 is connected to the thermostat 2 on both sides of the third cylinder bore 83. From the perspective of the entire coolant flow path within the engine block water jacket 11, the coolant output from the outlet of the pump 5 only passes through the other side of the first cylinder bore 81 and the other side of the second cylinder bore 82 before reaching the EGR cooler 6. Since it does not undergo sufficient heat exchange with the cylinder bore, its temperature is relatively low. This means the EGR cooler 6 can obtain relatively low-temperature coolant, thus meeting its heat dissipation requirements for the EGR gas and preventing a decrease in EGR gas heat exchange efficiency due to excessively high coolant temperature. Furthermore, the same-side connection reduces the cross-arrangement of pipes on both sides of the engine block water jacket 11, making the overall pipe routing more compact and orderly, and reducing space occupancy.

[0046] Optionally, the engine cooling system also includes a heater core 7, the inlet of which is connected to the outlet of the cylinder head water jacket 12 at the location of the fourth cylinder bore 84, and the outlet of which is connected to the inlet of the pump 5.

[0047] In this optional embodiment, the coolant inlet of the heater core 7 obtains coolant from the area corresponding to the fourth cylinder bore 84 of the cylinder head water jacket 12, and after heat exchange, it flows back to the inlet of the pump 5 through the outlet to rejoin the whole machine cooling cycle and form a heater circulation loop.

[0048] In terms of functional adaptability, the coolant temperature in the fourth cylinder bore 84 area of ​​the cylinder head water jacket 12 is in the "medium-high temperature range". This temperature characteristic is highly matched with the heating requirements of the heater core 7 - it can provide sufficient heat to the cab without causing the heater core 7 to overheat or the pipeline pressure to be abnormal due to excessive temperature.

[0049] Optionally, both the thermostat 2 and the oil cooler 3 are connected to the engine block.

[0050] In this optional embodiment, by integrating the thermostat 2 and the oil cooler 3 into an integrated layout connected to the cylinder block, the connection pipelines between the two and the engine water jacket 1 can be simplified, further optimizing the overall pipeline quantity and system structure.

[0051] Optionally, the thermostat 2 includes a sensor 25, which is configured to drive the thermostat 2 to open when the coolant temperature is detected to reach or exceed a preset threshold. The sensor 25 protrudes from the housing of the thermostat 2, and after the thermostat 2 is connected to the engine block, the sensor 25 extends into the engine water jacket 1.

[0052] In this optional embodiment, by designing the sensor 25 (usually a wax-coated structure) to protrude from the housing, and combining this with the assembly method of the sensor 25 extending into the engine water jacket 1, it can be ensured that after the thermostat 2 is assembled, the sensor 25 can penetrate deep into the coolant flow area of ​​the engine water jacket 1. This allows the wax-coated structure to directly and accurately sense the coolant temperature when the coolant is in a small-circulation cooling condition. When the temperature reaches or exceeds a preset threshold, it can drive the thermostat 2 to open in time to start the first circulation loop for large-circulation cooling, ensuring the responsiveness and temperature control accuracy of the engine cooling system.

[0053] Optionally, such as Figure 2 and Figure 3 As shown, the thermostat 2 includes a thermostat body 21. The thermostat body 21 has an internal flow channel. One end of the flow channel is connected to the radiator 4, and the other end is connected to the engine water jacket 1. A temperature-sensing valve assembly for controlling the flow channel's opening and closing is located at the other end. The temperature-sensing valve assembly also includes a bracket 22 connected to the thermostat body 21. The bracket 22 includes an upper bracket 221, a lower bracket 222, and a valve seat 223. The valve seat 223 is located at the other end of the flow channel. The upper bracket 221 is located inside the thermostat body 21, and the lower bracket 222 is located outside the thermostat body 21. A sensor 25 is located between the valve seat 223 and the lower bracket 222. A connecting flange is located at the end of the thermostat body 21 corresponding to the valve seat 223. The connecting flange is used to connect to the engine cylinder block sidewall. In this optional embodiment, the thermostat 2 includes a thermostat body 21, which has a flow channel inside. One end of the flow channel is used to connect to the radiator 4, and the other end is used to connect to the engine water jacket 1. The end connected to the engine water jacket 1 is provided with a temperature-sensing valve assembly for controlling the opening and closing of the flow channel. Specifically, the two ends of the flow channel of the thermostat 2 respectively constitute a single inlet and a single outlet for connecting to the outside. Combined with the above-mentioned temperature-sensing valve assembly, a single-valve thermostat structure is formed. Typically, the thermostat body 21 is designed as a shell structure, and the inner cavity of the shell constitutes the flow channel.

[0054] In addition, such as Figure 3 As shown, the bracket 22 includes an upper bracket 221, a lower bracket 222, and a valve seat 223. The valve seat 223 is located at the other end of the flow channel. The upper bracket 221 and lower bracket 222 are located on opposite sides of the valve seat 223, with the upper bracket 221 inside the thermostat body 21 and the lower bracket 222 outside the thermostat body 21. A sensor 25 is located between the valve seat 223 and the lower bracket 222. A connecting flange is provided at the end of the thermostat body 21 corresponding to the valve seat 223. This connecting flange is used to connect to the engine cylinder block sidewall, allowing the sensor 25 to penetrate the engine sidewall and extend into the engine water jacket 1 for temperature sensing.

[0055] Optionally, such as Figure 2 and Figure 3 As shown, the temperature sensing valve assembly also includes a push rod 23, an elastic element 24, and a valve 26. One end of the push rod 23 is connected to the upper bracket 221, and the other end is inserted into the sensor 25. The two ends of the elastic element 24 elastically abut against the lower bracket 222 and the valve 26, respectively. The sensor 25 is configured to drive the valve 26 to open against the elastic force of the elastic element 24 when the coolant temperature is sensed to rise to a preset threshold range. The sensor 25 includes a housing 251 and a rubber sleeve 252 disposed inside the housing 251. Paraffin wax is filled between the rubber sleeve 252 and the housing 251, and the other end of the push rod 23 is inserted into the rubber sleeve 252.

[0056] In this optional embodiment, the temperature sensing valve assembly integrates a push rod 23, an elastic element 24, a sensor 25, and a valve 26 via a bracket 22, resulting in a compact structure and stable connection of each component.

[0057] Specifically, the insertion and cooperation of push rod 23 and sensor 25 provide stable support and guidance for the temperature sensing action of sensor 25, ensuring accurate force direction; elastic element 24 provides reliable closing force for valve 26 at low temperatures and ensures smooth operation of valve 26 through reverse elastic action at high temperatures; sensor 25 directly senses coolant temperature and drives valve 26 to act, with rapid response and high temperature control accuracy. It can adjust the flow channel opening and closing in real time according to coolant temperature, thereby accurately controlling the coolant circulation between engine water jacket 1 and radiator 4, ensuring that the engine operates in a suitable temperature range, reducing energy loss and extending engine life.

[0058] The sensor 25 adopts a composite structure of "outer shell 251-paraffin wax-rubber sleeve 252". Combined with the insertion and cooperation of push rod 23 and rubber sleeve 252, when the coolant temperature changes, the paraffin wax can respond quickly and generate volume change. The expansion force or contraction force is efficiently transmitted to push rod 23 through rubber sleeve 252, ensuring the accuracy of temperature change sensing and providing a reliable basis for the precise action of valve 26.

[0059] The upper support 221 and lower support 222 are typically hollow arched structures. A valve hole is located at the center of the valve seat 223, and its opening and closing are controlled by the valve 26 described below, thereby controlling the opening and closing of the other end of the flow channel. One end of the push rod 23 is fixed to the center of the upper support 221, and the other end extends through the valve hole into the sensor 25. The valve 26 seals the outward-facing side of the valve hole in the valve seat 223. An elastic element 24 is fitted around the outside of the sensor 25. The elastic element 24 can be a cylindrical helical spring, with one end elastically abutting against the valve 26 and the other end elastically abutting against the lower support 222.

[0060] This utility model provides an engine assembly, including an engine and the aforementioned engine cooling system. The technical improvements and effects of the engine assembly are the same as those of the engine cooling system.

[0061] This utility model provides a vehicle including the aforementioned engine assembly. The technical improvements and technical effects of the vehicle are the same as those of the engine assembly.

[0062] Although the present invention has been disclosed above, its protection scope is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the protection scope of the present invention.

Claims

1. An engine cooling system, characterized in that, The system includes an engine water jacket (1), a thermostat (2), an oil cooler (3), a radiator (4), and a pump (5). The thermostat (2) is configured with a single outlet. The engine water jacket (1), the thermostat (2), the radiator (4), and the pump (5) are connected to form a first circulation loop. The engine water jacket (1), the oil cooler (3), and the pump (5) are connected to form a second circulation loop. After the engine is started, when the thermostat (2) senses that the coolant temperature is lower than the preset threshold, only the coolant in the second circulation loop flows to achieve small-loop heat dissipation; when the thermostat (2) senses that the coolant temperature reaches or exceeds the preset threshold, the coolant in both the first circulation loop and the second circulation loop flows to achieve large-loop heat dissipation.

2. The engine cooling system according to claim 1, characterized in that, The inlet of the thermostat (2) and the inlet of the oil cooler (3) are respectively connected to the same side of the engine water jacket (1) and are set to the adjacent cylinder bores.

3. The engine cooling system according to claim 1, characterized in that, The thermostat (2) and the oil cooler (3) are both connected to the engine block.

4. The engine cooling system according to claim 3, characterized in that, The thermostat (2) includes a sensor (25) configured to drive the thermostat (2) to open when the coolant temperature is detected to reach or exceed a preset threshold. The sensor (25) protrudes from the housing of the thermostat (2) and the thermostat (2) is connected to the cylinder block of the engine. The sensor (25) extends into the engine water jacket (1).

5. The engine cooling system according to claim 2, characterized in that, The engine water jacket (1) includes a cylinder water jacket (11), which is arranged around the outer side of the cylinder bore group of the engine. The cylinder bore group includes a first cylinder bore (81), a second cylinder bore (82), a third cylinder bore (83), and a fourth cylinder bore (84) arranged in sequence. A partition structure is provided on one side between the first cylinder bore (81) and the second cylinder bore (82), which is used to isolate the cylinder water jacket (11). The inlet of the thermostat (2) is connected to the cylinder water jacket (11) on one side of the third cylinder bore (83); the inlet of the oil cooler (3) is connected to the cylinder water jacket (11) on one side of the second cylinder bore (82); and the outlet of the pump (5) is connected to the cylinder water jacket (11) on one side of the first cylinder bore (81).

6. The engine cooling system according to claim 5, characterized in that, It also includes an EGR cooler (6), the inlet of which is connected to the cylinder water jacket (11) on the other side of the third cylinder bore (83), and the outlet of which is connected to the inlet of the pump (5). And / or, it also includes a heater core (7), the inlet of which is connected to the outlet of the cylinder head water jacket (12) at the location of the fourth cylinder hole (84), and the outlet of which is connected to the inlet of the pump (5).

7. The engine cooling system according to claim 4, characterized in that, The thermostat (2) includes a thermostat body (21), and the thermostat body (21) has a flow channel inside. One end of the flow channel is used to communicate with the radiator (4), and the other end of the flow channel is used to communicate with the engine water jacket (1). The other end is provided with a temperature sensing valve assembly for controlling the opening and closing of the flow channel. The temperature sensing valve assembly also includes a bracket (22) connected to the thermostat body (21). The bracket (22) includes an upper bracket (221), a lower bracket (222), and a valve seat (223). The valve seat (223) is located at the other end of the flow channel. The upper bracket (221) is located inside the thermostat body (21), and the lower bracket (222) is located outside the thermostat body (21). The sensor (25) is located between the valve seat (223) and the lower bracket (222). The thermostat body (21) is provided with a connecting flange at the end corresponding to the valve seat (223), and the connecting flange is used to connect to the cylinder block sidewall of the engine.

8. The engine cooling system according to claim 7, characterized in that, The temperature sensing valve assembly also includes a push rod (23), an elastic element (24), and a valve (26). One end of the push rod (23) is connected to the upper bracket (221), and the other end is inserted into the sensor (25). The two ends of the elastic element (24) elastically abut against the lower bracket (222) and the valve (26), respectively. The sensor (25) is configured to drive the valve (26) to open against the elastic force of the elastic element (24) when the coolant temperature is sensed to rise to a preset threshold range. The sensor (25) includes a housing (251) and a rubber sleeve (252) disposed inside the housing (251). Paraffin wax is filled between the rubber sleeve (252) and the housing (251). The other end of the push rod (23) is inserted into the rubber sleeve (252).

9. An engine assembly, characterized in that, Includes an engine and an engine cooling system as described in any one of claims 1-8.

10. A vehicle, characterized in that, Includes the engine assembly as described in claim 9.

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