CN102042116A - Engine cooling water jacket - Google Patents

Abstract

The invention provides an engine cooling water jacket with simple structure, small volume, uniform flow velocity and low pressure loss, which structurally comprises a cylinder block water jacket and a cylinder head water jacket, wherein the cylinder block water jacket is separated by two baffles to form a first flow passage and a second flow passage, and the first flow passage and the second flow passage are communicated with the cylinder head water jacket through water through holes on a cylinder head gasket. The cooling liquid mainly flows into the first flow passage from the water inlet and flows through the exhaust side, flows into the cylinder cover water jacket through the water passing hole on one side of the cylinder cushion, then flows into the second flow passage through the water passing hole on the other side of the cylinder cushion and flows through the air inlet side, and finally flows out of the water outlet. Therefore, the flow velocity of the cooling liquid of the cooling water jacket of the whole engine is more uniform, the deformation of the cylinder hole in a thermal state is reduced, and the power performance of the engine is improved; the water holes on the cylinder gasket can be arranged as required without being influenced by the design of the cylinder hole of the traditional water jacket, the flow area of the water holes on the cylinder gasket can be integrally increased, and the pressure loss of the whole water jacket and the performance requirement on the water pump are reduced.

Description

A kind of engine cooling water jacket

technical field

The invention relates to the technical field of automobile cooling systems, in particular to an engine cooling water jacket.

Background technique

With the development of internal combustion engine technology, the cooling system has also undergone tremendous changes, especially for water-cooled engines, the cooling cycle control is more and more precise, which has a significant effect on reducing emissions and fuel consumption. Several common forced circulation cooling systems exist at present: the first is that the coolant through the radiator is directly pumped into the engine body by the water pump for cooling, and then directly returns to the radiator. The structure of this cooling system is simple. In any working condition without wheels, the coolant is always cooled through the radiator. Therefore, under certain working conditions, there is a problem of overcooling. This type of cooling system has a greater impact on emissions and fuel consumption. big. The second is to arrange a thermostat between the water inlet of the water pump of the water outlet of the engine body, and the thermostat is opened or closed according to the temperature change of the coolant. When the temperature of the engine coolant is low, the thermostat is closed, and the water circulation only passes through the engine body and does not pass through the radiator. This circulation method is called a small circulation. This quickly raises the temperature of the coolant, improves combustion, reduces fuel consumption and emissions. When the temperature of the coolant is high, the thermostat is turned on, so that the coolant passing through the engine body must pass through the radiator to dissipate heat before being pumped into the engine body for cooling again. This circulation method is called a large cycle. This type of cooling system has higher control precision than the first type. When the temperature is low, a small cycle is enabled, and when the temperature is high, a large cycle is enabled to make the engine work in an ideal temperature range, thereby reducing emissions and Fuel consumption, so this form of cooling system is widely used.

In the second form of cooling system, the common design of the water jacket of the engine body is that the coolant is pumped into the water jacket of the cylinder block by the water pump, and then enters the water jacket of the cylinder head through the cylinder gasket, and then flows from the water jacket of the cylinder head. This water jacket has a simple structure and simple control, but the flow rate uniformity of the coolant in the water jacket is poor, and the cooling efficiency is low. With the development of technology, a double thermostat control system appeared again. The coolant is pumped into the water jackets of the cylinder block and the cylinder head respectively by the water pump, and then flows out from the outlets of the water jackets of the cylinder block and the cylinder head respectively, through their respective The thermostat controls the large and small circulation. This circulation system can obviously improve the inhomogeneity of the flow rate of the coolant in the water jacket and improve the cooling efficiency. However, the cooling system has a complex structure and high manufacturing cost, so it is not widely used at present. widely.

Contents of the invention

The purpose of the present invention is to propose an engine cooling water jacket with simple structure, small volume, uniform flow velocity and low pressure loss.

The engine cooling water jacket of the present invention includes a cylinder block water jacket and a cylinder head water jacket, the cylinder block water jacket is separated by two baffles to form a first flow channel and a second flow channel, and the first flow channel is connected to the water inlet And flow through the exhaust side, the second flow channel is connected to the water outlet and flows through the intake side, and both the first flow channel and the second flow channel communicate with the cylinder head water jacket through the water hole on the cylinder gasket.

Whether it is a traditional single-cylinder in-line engine or a V-type engine or an engine of other structures, the gist of the present invention is to set the first runner connected to the water inlet on the side with higher calorific value, and set the The second flow channel connected with the water outlet, the first flow channel and the second flow channel communicate with the water jacket of the cylinder head through the water hole on the cylinder gasket. The coolant mainly flows into the first flow channel from the water inlet and flows through the exhaust side, and flows into the cylinder head water jacket through the water hole on one side of the cylinder gasket, and then flows into the second flow channel through the water hole on the other side of the cylinder gasket. Flows through the intake side and finally out the outlet. This makes the coolant flow rate of the entire engine cooling water jacket more uniform, thereby reducing the deformation of the cylinder bore in a thermal state, reducing the tension of the piston ring, thereby reducing friction work, improving engine power performance, and reducing fuel consumption; the cylinder of the present invention The size and position of the water holes of the first flow channel and the second flow channel can be arranged according to the actual needs of the water holes on the pad. It is not affected by the cylinder hole of the traditional water jacket design, and the flow of the water holes on the cylinder pad can be increased as a whole. The flow area is reduced to reduce the pressure loss of the entire water jacket, thereby reducing the performance requirements of the water pump and reducing fuel consumption. When the present invention is applied to a supercharger, since the temperature on the exhaust side of the supercharger is higher, the required heat dissipation is larger, so the first flow channel of the cooling water jacket mainly flows through the exhaust side, and the second flow channel mainly flows through the exhaust side. Intake side: when the present invention is applied to natural air intake, the first flow channel can be arranged on the intake side, which is beneficial to increase the intake air volume and improve engine performance.

The longitudinal flow sections at any place of the water jacket of the cylinder block are equal. Due to the limitation of the layout position between the cylinder bores and the cylinder head bolt holes, the thickness of the water jacket between the two cylinders is larger than that of other areas. In order to uniform the flow rate, it is necessary to ensure that the longitudinal flow section at any part of the water jacket of the cylinder body is equal. The area decreases in height.

The bottom of the cylinder block water jacket is wavy. A preferred method for reducing the thickness of the water jacket between the two cylinders is to design the bottom of the water jacket of the cylinder block into a wave shape.

The highest height of the cylinder block water jacket is smaller than the diameter of the cylinder bore. Both the cylinder block water jacket and the cylinder head water jacket of the present invention should adopt thin water jackets, and the highest height of the cylinder block water jacket is smaller than the diameter of the cylinder bore. Due to the design of the conventional water jacket, the lowest end of the water jacket should be lower than the position of the first air ring of the piston ring at the bottom dead center, and for the stroke-to-bore ratio of the current vehicle gasoline engine, the empirical value is generally set to 1:1 , plus the height of the fire bank of the piston, the height of the conventional water jacket should be approximately equal to 1.1 multiplied by the diameter of the cylinder bore + the height of the fire bank. The present invention adopts the design of the short water jacket, and the quantitative value of the height of the short water jacket is defined to be about one time the diameter of the cylinder bore , so that the volume of the entire engine water jacket can be reduced, thereby increasing the flow rate of the coolant, utilizing convective heat exchange, it can improve cooling efficiency and reduce fuel consumption; at the same time, because the water jacket of the present invention has a small volume, the engine can be more efficient Fast warm-up, reducing fuel consumption and emissions during warm-up.

A water hole is provided on the baffle to communicate with the first flow channel and the second flow channel. In order to ensure a uniform flow rate of the coolant in the water jacket in the vicinity of the baffle, water holes are also provided on the baffle to ensure a more uniform flow rate of the coolant in the entire water jacket.

The water holes on the cylinder gasket are composed of through holes with different diameters. The flow velocity of each flow area is controlled by adjusting the diameter of the water hole of the cylinder gasket, so that the flow velocity in the entire engine cooling water jacket is more uniform.

The water holes of the cylinder head gasket are evenly arranged around the cylinder bore, so that the cooling liquid can flow through the high temperature area more evenly, and the heat dissipation performance of the cooling water jacket can be improved.

The flow area formed by the water hole connecting the first flow channel with the water jacket of the cylinder head is larger than the flow area formed by the water hole connected by the second flow channel and the water jacket of the cylinder head. Since the first flow channel is connected to the water pump, the coolant pressure is higher and the flow velocity is faster, so the flow area formed by the water hole connecting the first flow channel and the cylinder head water jacket should be larger to balance the flow rate.

The engine cooling water jacket of the present invention separates the cylinder block water jacket with two baffles to form a first flow channel and a second flow channel. Both the channel and the second flow channel communicate with the water jacket of the cylinder head through the water hole on the cylinder gasket. The coolant mainly flows into the first flow channel from the water inlet and flows through the exhaust side, and flows into the cylinder head water jacket through the water hole on one side of the cylinder gasket, and then flows into the second flow channel through the water hole on the other side of the cylinder gasket. Flows through the intake side and finally out the outlet. This makes the coolant flow rate of the entire engine cooling water jacket more uniform; and the number and diameter of the water holes on the cylinder head gasket can be adjusted as required to achieve the purpose of reducing pressure loss; because the cooling water jacket of the present invention can The flow rate is adjusted through the water holes, so the volume of the entire cooling water jacket can be made smaller, thereby reducing the performance requirements for the water pump.

Description of drawings

Fig. 1 is a schematic diagram of the system structure of the cooling water jacket of the present invention.

Fig. 2 is an isometric view of the intake side of the overall structure of the engine cooling water jacket of the present invention.

Fig. 3 is an isometric view of the exhaust side of the overall structure of the engine cooling water jacket of the present invention.

Fig. 4 is a front view of the intake side of the water jacket of the cylinder block of the present invention with the cylinder head bolt holes.

Fig. 5 is a schematic structural view of the baffle of the present invention.

Fig. 6 is a front view of the cylinder gasket of the present invention.

Fig. 7 is a top view of the cylinder block of the present invention.

Fig. 8 is a bottom view of the cylinder head of the present invention.

Fig. 9 is an isometric view of the cooling water jacket of the present invention assembled on the intake side.

Detailed ways

The present invention will be described in detail below in conjunction with specific embodiments and accompanying drawings.

As shown in Figures 1, 2, 3 and 6, the engine cooling water jacket of the present invention includes a cylinder block water jacket 1 and a cylinder head water jacket 2, and the cylinder block water jacket 1 is separated by two baffles 13 and 14 to form a first flow channel 11 and the second flow channel 12, the first flow channel 11 is connected to the water inlet 13 and flows through the exhaust side, the second flow channel 12 is connected to the water outlet 14 and flows through the intake side, the first flow channel 11 passes through the overpass on the cylinder head gasket 3 The water hole 312 communicates with the cylinder head water jacket 2 , and the second flow channel 12 communicates with the cylinder head water jacket 2 through the water hole 311 on the cylinder head gasket 3 . Outlet 15 is the outlet of the cylinder block water jacket 1 leading to other cooling systems, and outlet 21 is the outlet of the cylinder head water jacket 2 leading to other cooling systems. The first flow channel 11 mainly flows through the exhaust side, the second flow channel 12 mainly flows through the intake side, the coolant mainly flows into the first flow channel 11 from the water inlet 13, and then enters the cylinder head through the water hole 312 on the cylinder head gasket 3 The water jacket 2 then enters the second flow channel 12 through the water hole 311 on the cylinder head gasket 3 , and finally flows out of the water outlet 14 through the second flow channel 12 .

As shown in Figures 4, 7, and 8, it can be clearly seen from the figures that due to the limitation of the layout position between the cylinder bores and the bolt holes 23 of the cylinder head, the thickness of the water jacket between the two cylinders is larger than that of other areas. In order to uniform the flow rate, It is necessary to ensure that the longitudinal flow sections of the cylinder body water jacket 1 are equal at any position, and the height can be reduced in this area. Therefore, the bottom of the cylinder block water jacket 1 is wavy. Simultaneously, the maximum height of the cylinder block water jacket 1 is smaller than the diameter of the cylinder bore. Both the cylinder block water jacket 1 and the cylinder head water jacket 2 of the present invention should adopt thin water jackets, and the highest height of the cylinder block water jacket 1 is smaller than the diameter of the cylinder bore 40 . Due to the design of the conventional water jacket, the lowest end of the water jacket should be lower than the position of the first air ring of the piston ring at the bottom dead center, and for the stroke-to-bore ratio of the current vehicle gasoline engine, the empirical value is generally set to 1:1 , plus the height of the fire bank of the piston, the height of the conventional water jacket should be approximately equal to 1.1 multiplied by the diameter of the cylinder bore + the height of the fire bank. The present invention adopts the design of the short water jacket, and the quantitative value of the height of the short water jacket is defined to be about one time the diameter of the cylinder bore , so that the volume of the entire engine water jacket can be reduced, thereby increasing the flow rate of the coolant, utilizing convective heat exchange, it can improve cooling efficiency and reduce fuel consumption; at the same time, because the water jacket of the present invention has a small volume, the engine can be more efficient Fast warm-up, reducing fuel consumption and emissions during warm-up.

As shown in FIG. 5 , a water hole 131 is provided on the baffle plate 13 to communicate with the first flow channel 11 and the second flow channel 12 . In order to ensure a uniform flow rate of the coolant in the water jacket in the vicinity of the baffle 13 or 14, the baffles 13 and 14 are also provided with water holes to ensure a more uniform flow rate of the coolant in the entire water jacket.

As shown in Figure 6, the water hole 31 on the cylinder gasket 3 is composed of through holes with different diameters. A preferred implementation is to divide the water holes 31 on the cylinder head gasket 3 into two groups 311 and 312 of different diameters, and to control the flow rate in each area by adjusting the diameters of the two groups of water holes 311 and 312, so that the cooling water of the entire engine The flow rate in the sleeve is more uniform. The water holes 311 and 312 of the cylinder head gasket 3 are evenly arranged around the cylinder hole 40, so that the cooling liquid can flow through the high temperature area more evenly and improve the heat dissipation performance of the cooling water jacket. The flow area of the water hole 311 formed by the first channel 11 communicating with the cylinder head water jacket 2 is greater than the flow area formed by the water hole 312 formed by the second flow channel 2 connected with the cylinder head water jacket 2 . Since the first flow channel 11 is connected to the water pump, the coolant pressure is relatively high and the flow velocity is fast, so the flow area formed by the first flow channel 11 and the water hole 311 connected to the cylinder head water jacket 2 should be relatively large to balance the flow rate .

As shown in FIG. 7 , the figure clearly shows the positions of the first flow channel 11 and the second flow channel 12 of the cooling water jacket of the present invention, as well as the positions of the baffles 13 and 14 , and the positions of the cylinder head bolt holes 23 . Bore 40 is a cylinder bore.

As shown in FIG. 8 , the cylinder head water jacket 2 communicates with the water hole 312 of the cylinder head gasket through the hole 241 , and communicates with the water hole 311 of the cylinder head gasket through the hole 242 . Hole 25 is the combustion chamber.

As shown in Fig. 9, after the cooling water jacket of the present invention is assembled, the water inlet of the first flow channel 11 is connected to the cooling water pump, and the water outlet of the second flow channel 12 is connected to the thermostat. the

Claims (8)

1. An engine cooling water jacket is characterized in that said engine cooling water jacket comprises a cylinder block water jacket and a cylinder head water jacket, and said cylinder block water jacket is separated by two baffle plates to form a first flow channel and a second The first flow channel is connected to the water inlet and flows through the exhaust side, the second flow channel is connected to the water outlet and flows through the intake side, and both the first flow channel and the second flow channel pass through the cylinder gasket. The water hole communicates with the cylinder head water jacket. 2. The engine cooling water jacket according to claim 1, characterized in that the longitudinal flow sections at any place of the cylinder block water jacket are equal. 3. The engine cooling water jacket according to claim 2, wherein the bottom of the cylinder block water jacket is wavy. 4. The engine cooling water jacket according to claim 1, characterized in that the highest height of the cylinder block water jacket is smaller than the diameter of the cylinder bore. 5. The engine cooling water jacket according to claim 1 or 2 or 3 or 4, characterized in that a water hole is provided on the baffle to communicate with the first flow channel and the second flow channel. 6. The engine cooling water jacket according to claim 1 or 2 or 3 or 4, characterized in that the water holes on the cylinder gasket are composed of through holes of different diameters. 7. The engine cooling water jacket according to claim 1 or 2 or 3 or 4, characterized in that the water holes of the cylinder head gasket are evenly arranged around the cylinder bore. 8. The engine cooling water jacket according to claim 1 or 2 or 3 or 4, characterized in that the flow area formed by the water holes in communication between the first flow passage and the cylinder head water jacket is larger than that between the second flow passage and the cylinder The flow area formed by the water holes connected to the cover water jacket.

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