CN201218143Y - 1.8-2.4 liter diesel engine cylinder head - Google Patents

Abstract

The utility model relates to a 1.8 to 2.4-liter diesel engine cylinder cover. The integral cylinder cover is composed of in-line four cylinders, four-valves, a direct-injection and a variable-swirl gas-inlet passage, a swirl gas-inlet passage is arranged at the left side of the gas-inlet side of each cylinder, a neutral gas-inlet passage is arranged at the right side of the gas-inlet side of each cylinder; the four-valves on each cylinder cover are arranged in rhombus; a waste-gas recycling passage is arranged at the rear end of the cylinder cover; each cylinder adopts a diameter-5 cooling water passage and a diameter-6 cooling water passage which are connected to the nose bridge area of the cylinder cover; an oil sprayer installing hole is perpendicularly arranged at the center of the cylinder cover, the center of the oil sprayer hole is 1mm away from the center of the cylinder hole; a heater plug is arranged between the exhaust side of the cylinder cover and a thermal-power face; an oil distributing passage, a main oil passage and five camshaft lubricant passages are also arranged on the cylinder cover; three oil return passages are respectively arranged on each one of the two intake-exhaust sides of the cylinder cover, and the sectional oil-return area can reach 1600mm2. The environment-friendly cylinder cover of the utility model which can effectively lower oil consumption, reduce emission, and improve the performance per liter and the torque per liter can be used as the cylinder cover of a 1.8 to 2.4L-displacement diesel engine, and the emission can meet the standards of EURO-4 and above.

Description

1.8-2.4 liter diesel engine cylinder head

technical field

The utility model relates to the technical field of internal combustion engines, in particular to a cylinder head of a diesel engine.

Background technique

The role of the cylinder head is to seal the combustion chamber space formed by the cylinder liner and the piston, and it bears a lot of mechanical stress and thermal stress. At present, most domestic diesel engines have simple fuel injection systems, relatively high vortex in the cylinder head air passage, and relatively low emissions, which have brought a great impact on the environment. With the development of society, people pay more and more attention to environmental protection and energy saving. Compared with gasoline engines, diesel engines have advantages in power and economy, but are poor in emissions. Therefore, how to reduce the emissions of diesel engines has become a hot research topic. topic. At present, it is more commonly used to adopt high-pressure common rail system, cooperate with reasonable air passage, realize low swirl ratio, and finally achieve the purpose of low emission. Reasonable air valves (number, size) and intake and exhaust passages can ensure high inflation efficiency and lower manufacturing costs. The size of the cylinder head of this type of engine is small, the shape of the combustion chamber is simple, and the manufacturing cost is low. On the premise of not changing the structure of the water jacket, different swirl ratios and flow coefficients can be obtained through partial adjustment of the intake port to meet various power requirements. The range of engines matches the needs, and the product is highly scalable. In order to solve the problem of cooling and rigidity, the cooling water channel with drilling holes is the main technical measure at present.

Contents of the invention

In order to meet the diesel engine Euro IV emission requirements, the utility model provides a matching 1.8L-2.4L diesel engine cylinder head.

The concrete technical scheme of realizing the above-mentioned purpose is as follows:

The cylinder head of 1.8-2.4 liter diesel engine is in the form of in-line four-cylinder, four-valve, direct injection, variable swirl intake port, and integral structure. The cylinder head blank is cast from aluminum alloy with a minimum wall thickness of 4mm. The arrangement of the intake port of each cylinder is to arrange a swirl air port on the left side and a neutral air port on the right side (viewed from the engine intake side), so that the low-speed swirl ratio of the engine is 2.5, and the high-speed swirl ratio is 1.7. The cylinder head has 4 valves per cylinder arranged in a diamond shape. The exhaust gas recirculation (EGR) channel is arranged at the rear end of the cylinder head, and the exhaust gas recirculation (EGR) channel crosses the intake and exhaust sides of the cylinder head. Each cylinder adopts one Φ5 and one Φ6 drilling hole to guide the cooling water into the nose bridge area of the cylinder head for cooling, which can greatly improve the thermal fatigue resistance of the cylinder head and greatly reduce the requirements for casting technology. The fuel injector installation hole is arranged vertically in the center of the cylinder head, and the center of the fuel injector hole is 1mm away from the center of the cylinder hole to realize direct injection in the cylinder. The structure of the cylinder head can be equipped with a single overhead camshaft, 16 valves and 8 valve clearance adjusters. The glow plug is arranged between the exhaust side of the cylinder head and the fire surface. An oil distribution passage, a main oil passage and five camshaft lubricating oil passages are also arranged on the cylinder head to guide the lubricating oil sent from the main oil passage of the body to each kinematic pair. Three oil return passages are respectively arranged on the intake and exhaust sides of the cylinder head, and the cross-sectional area of the oil return can reach 1600mm ² .

The cylinder head blank is cast from aluminum alloy with a minimum wall thickness of 4mm.

The cylinder head has 4 valves per cylinder arranged in a diamond shape, and the coordinates relative to the cylinder center are IN1: (-25.7, -2.85), IN2: (-3.52, 25.5), EX1: (27.58, 1.18), EX2: (5.44, -7.23), where x is along the length of the cylinder head, y is along the width of the cylinder head, the diameter of the throat of the intake valve is Φ24.8mm, and the diameter of the throat of the exhaust valve is Φ20.4mm.

The utility model is an environment-friendly cylinder head that can effectively reduce fuel consumption, reduce emissions, and increase power and torque. It can be used as a cylinder head for a diesel engine with a displacement of 1.8-2.4L, and the emission can meet EURO-4 and above standards.

Description of drawings

Fig. 1 is a bottom view of the present invention.

Fig. 2 is a top view of the present invention.

Fig. 3 is a side view of the air intake of the present invention.

Fig. 4 is a sectional view of the valve of the present invention.

Fig. 5 is a cross-sectional view of the lubricating oil passage of the present invention.

Fig. 6 is a sectional view of the glow plug of the present invention.

Fig. 7 is a cross-sectional view of the borehole of the water channel of the present invention.

In Fig. 1-Fig. 7, air inlet (IN1) 1, air inlet (IN2) 2, exhaust port (EX1) 3, exhaust port (EX1) 4, oil return passage 5, glow plug 6, injector Oiler 7, cooling water hole in nose bridge area 8, swirl air passage 9, neutral air passage 10, EGR air passage 11, intake valve throat 12, exhaust valve throat 13, oil distribution passage 14, camshaft lubricating oil Road 15, main oil passage 16.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described by embodiment.

Example:

As shown in Figure 1-7, the cylinder head of a 1.8-2.4-liter diesel engine is in the form of an inline four-cylinder, four valves, direct injection, variable swirl inlet, and an integral structure. The cylinder head blank is cast from aluminum alloy with a minimum wall thickness of 4mm. The arrangement of the intake port of each cylinder is to arrange a swirl air port on the left side and a neutral air port on the right side (viewed from the engine intake side), so that the low-speed swirl ratio of the engine is 2.5, and the high-speed swirl ratio is 1.7. The cylinder head has 4 valves per cylinder arranged in a diamond shape, and the coordinates relative to the cylinder center are IN1: (-25.7, -2.85), IN2: (-3.52, 25.5), EX1: (27.58, 1.18), EX2: (5.44, -7.23), where x is along the length of the cylinder head, y is along the width of the cylinder head, the diameter of the throat of the intake valve is Φ24.8mm, and the diameter of the throat of the exhaust valve is Φ20.4mm. The exhaust gas recirculation (EGR) channel is arranged at the rear end of the cylinder head, and the exhaust gas recirculation (EGR) channel crosses the intake and exhaust sides of the cylinder head. Each cylinder adopts one Φ5 and one Φ6 drilling hole to guide the cooling water into the nose bridge area of the cylinder head for cooling, which can greatly improve the thermal fatigue resistance of the cylinder head and greatly reduce the requirements for casting technology. The fuel injector installation hole is arranged vertically in the center of the cylinder head, and the center of the fuel injector hole is 1mm away from the center of the cylinder hole to realize direct injection in the cylinder. The structure of the cylinder head can be equipped with a single overhead camshaft, 16 valves and 8 valve clearance adjusters. The glow plug is arranged between the exhaust side of the cylinder head and the fire surface, and an oil distribution passage, a main oil passage and five camshaft lubricating oil passages are arranged on the cylinder head to transfer the lubricating oil sent from the main oil passage of the body The oil is led to each movement pair, and three oil return passages are arranged on the intake and exhaust sides of the cylinder head respectively, and the cross-sectional area of the oil return can reach 1600mm ² . The invention is an environment-friendly cylinder head that can effectively reduce fuel consumption, reduce emissions, and increase power per liter and torque per liter. It can be used as a cylinder head for a diesel engine with a displacement of 1.8-2.4L, and the emission can meet EURO-4 and above standards.

Claims (3)

1. 1.8-2.4 liter diesel engine cylinder head, including in-line four-cylinder, four-valve, direct injection, variable swirl inlet, integral aluminum alloy casting cylinder head, characterized in that: A swirl intake port is arranged on the left side of each cylinder intake side and a neutral intake port is arranged on the right side; The cylinder head has 4 valves per cylinder arranged in a diamond shape; the exhaust gas recirculation channel is arranged at the rear end of the cylinder head, and the exhaust gas recirculation channel crosses the intake and exhaust sides of the cylinder head; Each cylinder is connected to the nose bridge area of the cylinder head with a cooling water channel with a diameter of Φ5 and a cooling water channel with a diameter of Φ6; The fuel injector installation hole is vertically arranged in the center of the cylinder head, and the distance between the center of the fuel injector hole and the center of the cylinder hole is 1mm; Arrange glow plugs between the exhaust side of the cylinder head and the fire surface; An oil distribution passage, a main oil passage and five camshaft lubricating oil passages are arranged on the cylinder head; Three oil return passages are respectively arranged on the intake and exhaust sides of the cylinder head, and the cross-sectional area of the oil return can reach 1600mm ² . 2. The cylinder head of a 1.8-2.4 liter diesel engine according to claim 1, wherein the minimum wall thickness of the cylinder head is 4 mm. 3. The cylinder head of a 1.8-2.4 liter diesel engine according to claim 1, characterized in that: the cylinder head has four valves per cylinder arranged in a diamond shape, and the size coordinates relative to the cylinder center are IN1: (-25.7, -2.85 ), IN2: (-3.52, 25.5), EX1: (27.58, 1.18), EX2: (5.44, -7.23), where x is along the length direction of the cylinder head, y is along the width direction of the cylinder head, and the throat diameter of the intake valve is Φ24.8mm, the exhaust valve throat diameter is Φ20.4mm.

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