A cooling jacket for a gasoline engine

Abstract

This invention provides a gasoline engine cooling water jacket, comprising a cylinder block water jacket with internal cylinder block water channels, and a cylinder head water jacket disposed on the cylinder block water jacket and having internal cylinder head water channels. The cylinder block water jacket has an inlet communicating with the cylinder block water channels. The top surface of the cylinder block water jacket has a first outlet and a second outlet communicating with the cylinder block water channels. The cylinder head water jacket has an outlet communicating with the cylinder head water channels. The bottom surface of the cylinder head water jacket has a first inlet and a second inlet communicating with the cylinder head water channels. A first flow control valve is disposed between the first outlet and the first inlet, and a second flow control valve is disposed between the second outlet and the second inlet. The flow diameter of the second flow control valve is larger than that of the first flow control valve. This gasoline engine cooling water jacket achieves "on-demand cooling" through the synergy of "structural design + flow regulation".

Description

Technical Field

[0001] This invention relates to the technical field of gasoline engines, and in particular to a gasoline engine cooling water jacket. Background Technology

[0002] A gasoline engine, also known as a gasoline fuel engine, is an engine that uses gasoline as fuel to convert internal energy into kinetic energy. During the operation of a gasoline engine, components such as the cylinder head and cylinder block generate a large amount of heat due to fuel combustion. If this heat cannot be dissipated effectively in time, the component temperature will become too high, which will not only reduce the power performance and fuel economy of the gasoline engine, but may also cause component deformation, damage and other malfunctions, seriously affecting the service life and operational reliability of the gasoline engine.

[0003] The cooling water jacket is a core component of the gasoline engine cooling system. It achieves heat exchange through coolant circulation, maintaining the stable operation of the gasoline engine in high-temperature environments. The coolant flows evenly within the cooling water jacket, conducting the heat generated in the combustion chamber and cylinder walls to the outside, preventing the gasoline engine from overheating.

[0004] Existing technical solutions have the following drawbacks: During operation, gasoline engines exhibit significant differences in heat load across different parts. For example, the cylinder head, particularly the "nose area" between the exhaust valves and around the exhaust manifold, experiences extremely high heat load due to direct contact with high-temperature combustion gases; while areas such as the lower part of the cylinder bore have relatively lower heat loads. Traditional cooling water jacket designs typically employ a single, interconnected cavity. After entering through the inlet, the coolant relies on its own flow characteristics for distribution, often flowing towards paths with less resistance, making it difficult to distribute flow according to the actual heat dissipation needs of each area. Summary of the Invention

[0005] The problem to be solved by the present invention is to provide a gasoline engine cooling water jacket that addresses the above-mentioned shortcomings in the prior art, thereby solving the problem that the coolant flow rate is difficult to distribute as needed in the prior art.

[0006] The above-mentioned objective of this invention is achieved through the following technical solution: a gasoline engine cooling water jacket, comprising a cylinder block water jacket with internal cylinder block water passages, and a cylinder head water jacket disposed on the cylinder block water jacket and having internal cylinder head water passages. The cylinder block water jacket has an inlet port communicating with the cylinder block water passages. The top surface of the cylinder block water jacket has a first outlet hole and a second outlet hole communicating with the cylinder block water passages. The cylinder head water jacket has an outlet port communicating with the cylinder head water passages. The bottom surface of the cylinder head water jacket has a first inlet hole and a second inlet hole communicating with the cylinder head water passages. A first flow control valve is disposed between the first outlet hole and the first inlet hole, and a second flow control valve is disposed between the second outlet hole and the second inlet hole. The flow diameter of the second flow control valve is larger than the flow diameter of the first flow control valve.

[0007] The present invention is further configured such that: the first flow control valve includes a valve body having a valve cavity, an elastic check valve disposed in the valve cavity and whose edge abuts against the wall of the valve cavity, the bottom surface of the valve body is provided with a first-level flow limiting hole and a second-level flow limiting hole with a flow area smaller than the first-level flow limiting hole and communicating with the valve cavity, the valve cavity is provided with a support seat for pressing against the check valve, and a plurality of connecting strips are provided between the support seat and the wall of the valve cavity.

[0008] The present invention is further configured such that: a plurality of flow-limiting teeth are provided on the wall of the primary flow-limiting orifice, and some of the flow-limiting teeth extend into the secondary flow-limiting orifice.

[0009] The present invention is further configured such that: a fixing post is provided on the bottom of the primary flow limiting hole, a flow limiting ring of elastic material is sleeved on the fixing post, and an anti-detachment ring is provided at the lower end of the fixing post.

[0010] The present invention is further configured such that: a bottom connecting groove is provided on the bottom wall of the valve cavity, a bottom connecting post is provided on the bottom wall of the check member to be inserted into the bottom connecting groove, a top connecting groove is provided on the end face of the support base facing the check member, and a top connecting post is provided on the end face of the check member facing the support base to be inserted into the top connecting groove.

[0011] The present invention is further configured such that: the outer wall of the support base has a tapered surface, and the tapered surface of the support base can abut against the anti-reverse surface of the anti-reverse member.

[0012] The present invention is further configured such that: a lower connecting block is provided on the valve body for interference fitting with the first water outlet, the lower connecting block having a lower through hole communicating with the first-stage flow limiting hole; and an upper connecting block is provided on the valve body for interference fitting with the first water inlet, the upper connecting block having an upper through hole communicating with the valve cavity.

[0013] The present invention is further configured such that: the second flow control valve includes a valve seat and several valve units, the valve seat is interference-fitted with the second water outlet, the top surface of the valve seat is provided with a tapered threaded hole and a water passage hole in sequence from bottom to top, the valve unit includes a housing threadedly connected to the threaded hole, the bottom surface of the housing is provided with a tapered positioning groove, an inner cavity and a liquid outlet hole in sequence from bottom to top, the bottom of the inner cavity is interference-fitted with a bushing, the middle of the bushing is provided with a sealing gasket, the middle of the sealing gasket has a liquid inlet hole, the top surface of the sealing gasket is provided with a sealing ring, a valve disc is slidably arranged in the inner cavity, and a check spring is provided in the inner cavity for pushing the valve disc to block the liquid inlet hole and press against the sealing ring.

[0014] The present invention is further configured such that: a valve cavity is formed on the top surface of the valve disc, a spring seat is provided on the top wall of the inner cavity, a spring groove is formed on the spring seat, the upper end of the check spring is embedded in the spring groove, and the lower end of the check spring is inserted into the valve cavity.

[0015] The present invention is further configured such that: a slide rail is fixedly connected to the cavity wall of the inner cavity, and a boss is fixedly connected to the outer wall of the valve disc, and a groove is provided on the boss to slide and cooperate with the slide rail.

[0016] In summary, the beneficial technical effects of the present invention are as follows:

[0017] (1) The cooling water jacket of this gasoline engine achieves "on-demand cooling" through the synergy of "structural design + flow regulation", as follows: According to the heat load difference of different areas of the cylinder head, a first flow control valve and a second flow control valve with different flow diameters are set between the cylinder block water jacket and the cylinder head water jacket, so that the peak heat load area obtains "large flow + fast flow rate" (strong cooling) and the low heat load area obtains "small flow + slow flow rate" (moderate cooling). The "directional distribution" of coolant is achieved through the first flow control valve and the second flow control valve, so that the cooling capacity is precisely focused on the area that needs it most, which not only ensures the safety of key parts of the engine (avoids overheating), but also reduces unnecessary energy waste and improves the overall thermal efficiency.

[0018] (2) By setting a first flow control valve and a second flow control valve with a backflow prevention function, the cooling water jacket of this gasoline engine can, on the one hand, prevent the high-temperature coolant in the cylinder head water jacket from flowing back into the cylinder block water jacket and weakening the cooling effect of the cylinder block, and on the other hand, avoid "disordered flow distribution". By maintaining a stable "positive pressure gradient" through unidirectional flow, it can ensure that the coolant flowing through the first flow control valve and the second flow control valve can be accurately converted into "positive flow in the corresponding area" and is not easily disturbed by reverse flow. Attached Figure Description

[0019] Figure 1 This is an exploded structural diagram of the gasoline engine cooling water jacket in this invention;

[0020] Figure 2 This is a schematic diagram of the cylinder head water jacket structure in this invention;

[0021] Figure 3 This is an exploded structural diagram of the first flow control valve in this invention;

[0022] Figure 4 This is a cross-sectional view of the first flow control valve in this invention;

[0023] Figure 5 This is an exploded structural diagram of the second flow control valve in this invention;

[0024] Figure 6 This is a cross-sectional view of the valve unit in this invention;

[0025] Figure 7 This is an exploded structural diagram of the valve unit in this invention;

[0026] Figure 8 This is a schematic diagram of the outer shell structure in this invention.

[0027] In the above attached figures: 1. Cylinder body water jacket; 2. Water inlet; 3. First water outlet; 4. Second water outlet; 5. Cylinder head water jacket; 6. Water outlet; 7. First water inlet; 8. Second water inlet; 9. First flow control valve; 10. Valve body; 101. Valve cavity; 11. Primary flow limiting orifice; 12. Secondary flow limiting orifice; 13. Flow limiting tooth; 14. Fixing post; 15. Flow limiting ring; 16. Anti-detachment ring; 17. Bottom connecting groove; 18. Check valve; 181. Pressure surface; 182. Check surface; 19. Bottom connecting post; 20. Support base; 21. Top connecting groove; 22. Top connecting post; 23. Connecting... 24. Connecting bar; 25. Lower connecting block; 26. Lower through hole; 27. Upper connecting block; 28. Upper through hole; 29. ​​Second flow control valve; 30. Valve seat; 31. Threaded hole; 32. Water passage hole; 33. Valve unit; 34. Housing; 35. Positioning groove; 36. Inner cavity; 37. Liquid outlet hole; 38. Bushing; 39. Positioning flange; 40. Sealing gasket; 41. Connecting ring groove; 42. Connecting convex ring; 43. Sealing ring; 44. Spring seat; 45. Spring groove; 46. Slide rail; 47. Valve disc; 48. Boss; 49. Slide groove; 50. Disc cavity; 51. Check spring; 52. Sealing ring. Detailed Implementation

[0028] To make the technical means, creative features, objectives and effects of this invention clearer and easier to understand, the invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

[0029] like Figure 1 As shown, the present invention proposes a gasoline engine cooling water jacket, including a cylinder block water jacket 1 and a cylinder head water jacket 5 disposed on the cylinder block water jacket 1.

[0030] like Figure 1 As shown, the cylinder block water jacket 1 is used to cool the cylinder block of a gasoline engine. The cylinder block water jacket 1 has cylinder block water channels for coolant flow. An inlet 2 communicating with the cylinder block water channels is provided on the cylinder block water jacket 1, through which coolant enters the cylinder block water channels. A first outlet hole 3 and a second outlet hole 4 communicating with the cylinder block water channels are provided on the top surface of the cylinder block water jacket 1. In this embodiment, there are two first outlet holes 3 and six second outlet holes 4.

[0031] like Figure 1 As shown, the cylinder head water jacket 5 is used to cool the cylinder head of the gasoline engine. The cylinder head water jacket 5 has a cylinder head water channel for coolant to flow through. The cylinder head water jacket 5 has an outlet 6 that communicates with the cylinder head water channel. After the coolant runs out of the cylinder head water channel through the outlet 6, it will enter the radiator to cool down. The cooled coolant will then circulate back to the inlet 2 to form a water cooling cycle.

[0032] like Figure 1 and 2As shown, the bottom surface of the cylinder head water jacket 5 is provided with a first water inlet 7 and a second water inlet 8 that communicate with the cylinder head water passage. The two first water inlets 7 are aligned above the two first water outlets 3. The first water inlets 7 are close to the low heat load area of ​​the gasoline engine cylinder head. The six second water inlets 8 are aligned above the six second water outlets 4. Two second water outlets that are close to each other form a group. The six second water outlets are divided into three groups with intervals. The three groups of second water inlets 8 are respectively close to the three heat load peak areas of the gasoline engine cylinder head.

[0033] like Figure 1 As shown, a first flow control valve 9 is provided between the first water outlet 3 and the first water inlet 7, and a second flow control valve 28 is provided between the second water outlet 4 and the second water inlet 8. The flow diameter of the second flow control valve 28 is larger than that of the first flow control valve 9. The second flow control valve 28 has a large coolant flow rate (more coolant passes through per unit time) and a strong cooling effect in the corresponding area (peak heat load area) (large flow rate, fast flow velocity, and high heat exchange efficiency).

[0034] like Figure 3 and 4 As shown, in this embodiment, the flow port diameter of the first flow control valve 9 is DN30. The first flow control valve 9 includes a valve body 10. The bottom surface of the valve body 10 is provided with a first-level flow limiting hole 11, a second-level flow limiting hole 12, and a valve cavity 101 that are connected in sequence. The first-level flow limiting hole 11 is a circular hole. There are eight second-level flow limiting holes 12. The eight second-level flow limiting holes 12 are equidistantly distributed in a circle. The second-level flow limiting holes 12 are fan-shaped annular holes. The flow area of ​​the second-level flow limiting holes 12 is smaller than that of the first-level flow limiting holes 11.

[0035] In this embodiment, when the first flow control valve 9 is working, the coolant flows through the first-level flow limiting orifice 11 and the second-level flow limiting orifice 12 in sequence. Since the flow area of ​​the second-level flow limiting orifice 12 is smaller than that of the first-level flow limiting orifice 11, when the coolant flows from the first-level flow limiting orifice 11 (which is a large orifice) into the second-level flow limiting orifice 12 (which is a small orifice), the flow area is reduced and the resistance is increased, thereby forming a local pressure drop and achieving the effect of flow limiting. The coolant flow rate is reduced accordingly.

[0036] like Figure 3 and 4 As shown, in this embodiment, flow-limiting teeth 13 are fixedly connected to the wall of the primary flow-limiting orifice 11. There are sixteen flow-limiting teeth 13, eight of which extend into the secondary flow-limiting orifice 12. In this embodiment, when the first flow control valve 9 is working, the coolant flows sequentially through the primary flow-limiting orifice 11 and the secondary flow-limiting orifice 12. During this process, the coolant flows through the flow-limiting teeth 13, which increase the local resistance of the flow channel, thereby improving the flow-limiting effect.

[0037] like Figure 3 and 4As shown, a cylindrical fixing post 14 is fixedly connected to the center of the bottom of the primary flow-limiting orifice 11. A flow-limiting ring 15 is sleeved on the fixing post 14. The flow-limiting ring 15 is made of elastic material, preferably rubber. The flow-limiting ring 15 abuts against the bottom of the primary flow-limiting orifice 11, and the flow-limiting ring 15 also partially blocks the eight secondary flow-limiting orifices 12. An anti-detachment ring 16 is fixedly connected to the lower end of the fixing post 14. The anti-detachment ring 16 is used to limit the separation of the fixing post 14 and the flow-limiting ring 15, and to a certain extent prevents the flow-limiting ring 15 from separating from the fixing post 14 due to the impact of high-pressure coolant.

[0038] In this embodiment, when the first flow control valve 9 is working, the hydraulic pressure increases, the flow limiting ring 15 is deformed under pressure, and the outer diameter of the flow limiting ring 15 increases. At the same time, the flow limiting ring 15 partially blocks the eight secondary flow limiting orifices 12. The flow area of ​​the secondary flow limiting orifices 12 decreases, the resistance increases, and a pressure drop is formed locally, thereby achieving the purpose of improving the flow limiting effect. When the hydraulic pressure decreases, the elastic flow limiting ring 15 will reset, the outer diameter of the flow limiting ring 15 decreases, the flow area of ​​the secondary flow limiting orifices 12 increases, the resistance decreases, thereby achieving the purpose of reducing the flow limiting effect. The first flow control valve 9 achieves the purpose of dynamic flow limiting by setting the flow limiting ring 15.

[0039] like Figure 3 and 4 As shown, a bottom connecting groove 17 is provided at the center of the bottom wall of the valve cavity 101. The bottom connecting groove 17 is a circular groove and extends into the fixed post 14. A check valve 18 is provided inside the valve cavity 101. A cylindrical bottom connecting post 19 is fixedly connected to the bottom wall of the check valve 18. The bottom connecting post 19 is inserted into the bottom connecting groove 17.

[0040] like Figure 3 and 4 As shown, the check valve 18 is bowl-shaped and made of an elastic material, preferably rubber. In the initial state, the edge of the check valve 18 is in contact with the cavity wall of the valve cavity 101. The check valve 18 has a pressure-receiving surface 181 facing the secondary flow limiting orifice 12 and a check surface 182 facing away from the secondary flow limiting orifice 12.

[0041] In this embodiment, when the first flow control valve 9 is working, the high-pressure coolant impacts the pressure-bearing surface 181 of the check surface 182, and the check element 18 deforms inward, forming a gap between the check element 18 and the cavity wall of the valve cavity 101 for the coolant to pass through; when the coolant backflows, it impacts the check surface 182 of the check element 18, and the check element 18 tends to deform outward, with the edge of the check element 18 fitting against the cavity wall of the valve cavity 101, thus restricting the backflow of coolant.

[0042] like Figure 3 and 4As shown, a support seat 20 is provided at the center of the valve cavity 101. The support seat 20 is located on the side of the check valve 18 away from the secondary flow limiting orifice 12. A circular top connecting groove 21 is formed on the end face of the support seat 20 facing the check valve 18. A cylindrical top connecting post 22 is provided on the end face of the check valve 18 facing the support seat 20. The top connecting post 22 is inserted into the top connecting groove 21. Four connecting strips 23 are provided between the support seat 20 and the cavity wall of the valve cavity 101. The four connecting strips 23 are equidistantly distributed in a circle with the central axis of the support seat 20 as the center. The gaps between the four connecting strips 23 form a flow channel for the coolant to pass through.

[0043] In this embodiment, when the first flow control valve 9 is working, the bottom connecting post 19 of the check valve 18 is inserted into the bottom connecting groove 17, and the top connecting post 22 of the check valve 18 is inserted into the top connecting groove 21. The check valve 18 is fixed between the valve body 10 and the support seat 20. When the check valve 18 is impacted by high-pressure coolant, the support seat 20 can improve the impact resistance of the check valve 18, so the check valve 18 is not easily blown out of the valve cavity 101, and the first flow control valve 9 is not prone to check valve failure.

[0044] The outer wall of the support base 20 has a tapered surface, which can abut against the check surface 182 of the check valve 18. In this embodiment, when the first flow control valve 9 is working, the high-pressure coolant impacts the pressure surface 181 of the check surface 182, and the check valve 18 will deform inward until the check surface 182 of the check valve 18 abuts against the tapered surface of the support base 20. At this time, the check valve 18 is difficult to deform inward, thus preventing the check valve 18 from being damaged due to excessive deformation over a long period of time.

[0045] like Figure 3 and 4 As shown, a lower connecting block 24 is fixedly connected to the bottom surface of the valve body 10. The lower connecting block 24 is interference-fitted with the first water outlet 3. The lower connecting block 24 has a lower through hole 25 communicating with the first-stage flow limiting hole 11. An upper connecting block 26 is fixedly connected to the top surface of the valve body 10. The upper connecting block 26 is interference-fitted with the first water inlet 7. The upper connecting block 26 has an upper through hole 27 communicating with the valve cavity 101.

[0046] like Figure 1 and 5 As shown, the second flow control valve 28 includes a valve seat 29 and several valve units 32. The valve seat 29 is a stepped plate. The valve seat 29 is interference-fitted with the second water outlet 4. The top surface of the valve seat 29 is provided with a gradually narrowing threaded hole 30 and a water passage hole 31 in sequence.

[0047] like Figure 1 and 5As shown, in this embodiment, the flow port diameter of valve unit 32 is DN50, which is larger than the flow port diameter of the first flow control valve 9. Valve unit 32 includes a cylindrical housing 33, the bottom of housing 33 has external threads, housing 33 is threaded to the threaded hole 30 of valve seat 29 through external threads, and the top of housing 33 is interference-fitted to the second water inlet hole 8.

[0048] like Figure 6 and 7 As shown, the bottom surface of the outer casing 33 is provided with a positioning groove 34, an inner cavity 35, and a liquid outlet 36 sequentially arranged upwards. A circular bushing 37 is interference-fitted into the bottom of the inner cavity 35. A sealing ring 51 is fitted onto the bushing 37, forming a seal between the bushing 37 and the outer casing 33. A positioning flange 38, which engages with the positioning groove 34, is fixedly connected to the outer wall of the bushing 37. A sealing gasket 39 is provided in the middle of the bushing 37. A connecting ring groove 40 is circumferentially formed on the outer wall of the sealing gasket 39. A connecting protrusion 41, which engages with the connecting ring groove 40, is fixedly connected to the inner wall of the bushing 37. A circular liquid inlet is located in the middle of the sealing gasket 39, and a sealing ring 42 is fixedly connected to the top surface of the sealing gasket 39.

[0049] like Figure 6 and 8 As shown, a spring seat 43 is fixedly connected to the top wall of the inner cavity 35, and a spring groove 44 is provided on the spring seat 43. A slide rail 45 is fixedly connected to the cavity wall of the inner cavity 35. A valve disc 46 is slidably disposed at the center of the inner cavity 35. A boss 47 is fixedly connected to the outer wall of the valve disc 46, and a slide groove 48 is provided on the boss 47 to slide and engage with the slide rail 45. A valve cavity 49 is provided on the top surface of the valve disc 46. A check spring 50 is provided between the spring seat 43 and the valve disc 46. The upper end of the check spring 50 is embedded in the spring groove 44, and the lower end of the check spring 50 is inserted into the valve cavity 49. The check spring 50 is used to push the valve disc 46 to block the liquid inlet hole and press against the sealing ring 42.

[0050] The design of this gasoline engine cooling water jacket is essentially "distributing cooling capacity on demand." The design is based on the imbalance of heat load in different parts of the gasoline engine: 1. The cylinder block mainly bears the mechanical load of the piston reciprocating motion and the frictional heat of the cylinder wall. The overall temperature is relatively flat (usually between 150-250℃), the cooling demand is relatively uniform, and the cylinder block heat load is relatively low; 2. The cylinder head integrates core components such as the combustion chamber, spark plug, intake and exhaust valves. The top of the combustion chamber and the area around the exhaust valve are the peak heat load areas (temperatures can reach 300-500℃). The high temperature generated by combustion directly acts on this area, and the exhaust valve continuously discharges high-temperature exhaust gas, resulting in severe heat accumulation; 3. The edge of the cylinder head and the area near the intake valve are the low heat load areas. The intake valve introduces low-temperature fresh air-fuel mixture, carrying away some heat, and the temperature is relatively low (usually between 200-300℃).

[0051] Therefore, the core requirement of the cooling water jacket is to prioritize cooling the peak heat load area of ​​the cylinder head while avoiding excessive cooling in the low load area (reducing heat waste and avoiding local condensation).

[0052] Coolant flow path: 1. Coolant (usually an aqueous solution of ethylene glycol) is injected into the cylinder block water jacket 1 through the inlet 2, first filling the cylinder block water jacket 1, and providing preliminary and uniform cooling to the cylinder block (meeting the cylinder block's low and uniform heat load requirements); 2. One connecting path of the coolant is the first outlet 3, the first flow control valve 9, and the first inlet 7, and the other connecting path is the second outlet 4, the second flow control valve 28, and the second inlet 8; 3. After the coolant runs out of the cylinder head water passage through the outlet 6, it enters the radiator for cooling. The cooled coolant then circulates back to the inlet 2, forming a water cooling cycle.

[0053] The cooling capacity (efficiency of heat removal) of coolant mainly depends on flow rate and flow velocity, both of which are directly linked to heat load demand: 1. The first flow control valve 9 is located near the low heat load area (such as the cylinder head edge or near the intake valve). The flow diameter of the first flow control valve 9 is small, resulting in high flow resistance, low flow rate (reducing coolant waste), and slow flow velocity (moderate heat exchange intensity). This allows it to remove only a suitable amount of heat, avoiding energy loss due to overcooling and preventing condensation caused by excessively low local temperatures (water + fuel vapor may cause corrosion). 2. The second flow control valve 28 is located near the peak heat load area (such as the exhaust valve or the top of the combustion chamber). The flow diameter of the second flow control valve 28 is large, resulting in low flow resistance, high flow rate (more coolant participates in heat exchange), and fast flow velocity (the faster the flow velocity, the more intense the heat exchange between the coolant and the cylinder head wall). This allows it to quickly remove a large amount of heat, preventing local overheating.

[0054] This gasoline engine cooling water jacket achieves "on-demand cooling" through the synergy of "structural design + flow regulation," specifically as follows: Based on the differences in heat load in different areas of the cylinder head, a first flow control valve 9 and a second flow control valve 28 with different flow diameters are set between the cylinder block water jacket 1 and the cylinder head water jacket 5. This allows the peak heat load area to receive "high flow rate + fast flow velocity" (strong cooling), while the low heat load area receives "low flow rate + slow flow velocity" (moderate cooling). The first flow control valve 9 and the second flow control valve 28 achieve "directional distribution" of the coolant, allowing the cooling capacity to be precisely focused on the areas that need it most. This ensures the safety of critical engine components (avoiding overheating), reduces unnecessary energy waste, and improves overall thermal efficiency.

[0055] This gasoline engine cooling water jacket is equipped with a first flow control valve 9 and a second flow control valve 28 with a backflow prevention function. On the one hand, it prevents the high-temperature coolant in the cylinder head water jacket 5 from flowing back into the cylinder block water jacket 1, thus weakening the cooling effect of the cylinder block. On the other hand, it avoids "disordered flow distribution" by maintaining a stable "positive pressure gradient" through unidirectional flow, ensuring that the coolant flowing through the first flow control valve 9 and the second flow control valve 28 can be accurately converted into "positive flow in the corresponding area" and is not easily interfered with by reverse flow.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A cooling jacket for a gasoline engine, characterized by: The system includes a cylinder water jacket (1) with an internal cylinder water channel and a cylinder head water jacket (5) set on the cylinder water jacket (1) and having an internal cylinder head water channel. The cylinder water jacket (1) has an inlet (2) connected to the cylinder water channel. The top surface of the cylinder water jacket (1) has a first outlet (3) and a second outlet (4) connected to the cylinder water channel. The cylinder head water jacket (5) has an outlet (6) connected to the cylinder head water channel. The bottom surface of the cylinder head water jacket (5) has a first inlet (7) and a second inlet (8) connected to the cylinder head water channel. A first flow control valve (9) is provided between the first outlet (3) and the first inlet (7). A second flow control valve (28) is provided between the second outlet (4) and the second inlet (8). The flow diameter of the second flow control valve (28) is larger than the flow diameter of the first flow control valve (9). The first flow control valve (9) includes a valve body (10) having a valve cavity (101) and an elastic check valve (18) disposed in the valve cavity (101) and whose edge abuts against the wall of the valve cavity (101). The bottom surface of the valve body (10) is provided with a first-level flow limiting hole (11) connected in sequence and a second-level flow limiting hole (12) with a flow area smaller than the first-level flow limiting hole (11) and connected to the valve cavity (101). A support seat (20) that abuts against the check valve (18) is provided in the valve cavity (101). A plurality of connecting strips (23) are provided between the support seat (20) and the wall of the valve cavity (101). The second flow control valve (28) includes a valve seat (29) and several valve units (32). The valve seat (29) is interference-fitted with the second water outlet (4). The top surface of the valve seat (29) is provided with a tapered threaded hole (30) and a water passage hole (31) in sequence. The valve unit (32) includes a housing (33) threadedly connected to the threaded hole (30). The bottom surface of the housing (33) is provided with a tapered positioning groove (34), an inner cavity (35), and an outlet in sequence. A bushing (37) is interference-fitted into the bottom of the inner cavity (35) of the liquid hole (36). A sealing gasket (39) is provided in the middle of the bushing (37). The sealing gasket (39) has a liquid inlet hole in the middle. A sealing ring (42) is provided on the top surface of the sealing gasket (39). A valve disc (46) is slidably provided in the inner cavity (35). A check spring (50) is provided in the inner cavity (35) for pushing the valve disc (46) to block the liquid inlet hole and press against the sealing ring (42).

2. A water jacket for a gasoline engine according to claim 1, characterized in that: The primary flow-limiting orifice (11) has several flow-limiting teeth (13) on its wall, and some of the flow-limiting teeth (13) extend into the secondary flow-limiting orifice (12).

3. A water jacket for a gasoline engine according to claim 1, characterized in that: A fixing post (14) is provided on the bottom of the primary flow limiting hole (11), and a flow limiting ring (15) of elastic material is sleeved on the fixing post (14). An anti-detachment ring (16) is provided at the lower end of the fixing post (14).

4. A water jacket for a gasoline engine according to claim 1, characterized in that: The bottom wall of the valve cavity (101) is provided with a bottom connecting groove (17), the bottom wall of the check member (18) is provided with a bottom connecting post (19) that is inserted into the bottom connecting groove (17), the end face of the support base (20) facing the check member (18) is provided with a top connecting groove (21), and the end face of the check member (18) facing the support base (20) is provided with a top connecting post (22) that is inserted into the top connecting groove (21).

5. A water jacket for a gasoline engine according to claim 1, characterized in that: The outer wall of the support (20) has a tapered surface, which can abut against the anti-reverse surface (182) of the anti-reverse member (18).

6. A water jacket for a gasoline engine according to claim 1, characterized in that: The valve body (10) is provided with a lower connecting block (24) that is interference-fitted to the first water outlet (3). The lower connecting block (24) has a lower through hole (25) that communicates with the first flow limiting hole (11). The valve body (10) is provided with an upper connecting block (26) that is interference-fitted to the first water inlet (7). The upper connecting block (26) has an upper through hole (27) that communicates with the valve cavity (101).

7. A water jacket for a gasoline engine according to claim 1, characterized in that: The valve disc (46) has a valve cavity (49) on its top surface. A spring seat (43) is provided on the top wall of the inner cavity (35). A spring groove (44) is provided on the spring seat (43). The upper end of the anti-reverse spring (50) is embedded in the spring groove (44), and the lower end of the anti-reverse spring (50) is inserted into the valve cavity (49).

8. A water jacket for a gasoline engine according to claim 1, characterized in that: A slide rail (45) is fixedly connected to the cavity wall of the inner cavity (35), and a boss (47) is fixedly connected to the outer wall of the valve disc (46). A groove (48) is provided on the boss (47) to slide and cooperate with the slide rail (45).

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