CN201521359U - Cylinder head of small direct injection diesel engine - Google Patents

Abstract

The utility model relates to the technical field of combustion engines, in particular to a cylinder head of a small direct-injection diesel engine. The thickness c2 is 7-8mm; if a two-dimensional coordinate system is established with the center of the plane on the cylinder head as the origin, the distance x1 from the central axis of the intake valve to the Y-axis is 18-19mm, and the distance from the central axis of the exhaust valve to the Y-axis x2 is 20 ~21mm, the distance from the center line of the intake and exhaust valves to the X-axis y1 is 5-7mm; the distance from the center axis of the injector hole to the Y-axis x3 is 1-1.5mm, and the distance to the X-axis y3 is 6-7mm; The installation angle α of the device hole is 17°～20°, and the installation deflection angle β is 45°～50°. This type of cylinder head can greatly improve the ability to withstand alternating thermal loads and mechanical loads, and is more suitable for the direct injection combustion process of small diesel engines.

Description

Cylinder head of small direct injection diesel engine

technical field

The utility model relates to the technical field of combustion engines, in particular to a cylinder head of a small direct-injection diesel engine, and this type of cylinder head is especially suitable for direct-injection diesel engines with a displacement below 0.3L.

Background technique

The role of the cylinder head of a diesel engine is to seal the cylinder and form a combustion space with the piston to withstand the impact of high-temperature and high-pressure gas. The rationality of layout and size will have a crucial impact on the overall performance of the diesel engine. Therefore, the design and structure of the cylinder head is very particular.

Utility model content

The technical problem to be solved by the utility model is to provide a cylinder head of a small direct injection diesel engine with a more reasonable design structure in order to improve and enhance the working performance of the current small direct injection diesel engine. Direct-injection diesel engines with volume below 0.3L.

The technical scheme adopted by the utility model is: a cylinder head of a small direct-injection diesel engine, which has a spiral air inlet, and the fire surface is provided with intake valves, exhaust valves and fuel injector holes, and the total height H of the cylinder head is 62~64mm, the total length L is 144~146mm, the total width B is 114~116mm, the thickness c2 of the fire surface bottom plate is 7~8mm; if a two-dimensional coordinate system is established with the center of the plane on the cylinder head as the origin, the central axis The distance x1 to the Y-axis of the coordinate axis is 18-19mm, the throat diameter of the intake passage d1 is 28-30mm, the distance x2 from the central axis of the exhaust valve to the Y-axis of the coordinate axis is 20-21mm, and the throat diameter of the exhaust passage is d2 The distance y1 between the center line of the intake and exhaust valves and the X-axis of the coordinate axis is 5 to 7 mm; the injector holes are arranged on the opposite side of the line connecting the centers of the intake and exhaust valves; The distance x3 from the axis to the Y axis is 1~1.5mm, and the distance y3 to the X axis is 6~7mm; the installation angle α of the injector hole is 17°~20°, the installation deflection angle β is 45°~50°, the bridge of the nose The zone thickness c1 is 8-9 mm, and the height h4 is 14-16 mm.

The throat diameter d1 of the head of the spiral inlet is 28-30mm, the diameter d3 of the turning part is 24-26mm, the tail is a trapezoidal cross-section, the upper bottom k is 29-30mm, the lower bottom p is 32-33mm, and the height h6 The height h1 of the central axis of the spiral inlet port relative to the upper plane of the cylinder head is 30~32mm, and the eccentric distance h5 relative to the center line of the intake and exhaust valves is 24~27mm; the head of the spiral inlet port The ratio of the cross-sectional area of the throat to the tail is 1.2-1.4, the height h2 of the spiral chamber at the turning part is 20-23 mm, and the height h3 of the air guide screen is 5-7 mm.

A dark oil passage is arranged on the exhaust side of the cylinder head. The lubricating oil from the hidden oil passage of the body enters the hidden oil passage with a diameter of 7mm on the bottom surface of the cylinder head, and then enters the hidden oil passage with a diameter of 5mm at 90° on the top surface of the cylinder head, and then enters the hollow pin of the cylinder head cover to Oil drips from the cylinder head cover to lubricate the valve rocker arm assembly.

The beneficial effects of the utility model are: the type of cylinder head is suitable for small direct-injection diesel engines, especially for direct-injection diesel engines with displacement below 0.3L. The design structure and size of the cylinder head of the small direct-injection diesel engine, including the arrangement and size of the valves, air passages, oil holes and the entire fire surface on the cylinder head, are more reasonable than the existing products, which greatly improves the overall working performance of the diesel engine . According to the characteristics of the direct injection combustion method, the design and structure of the cylinder head can effectively guarantee its own strength and rigidity; its reasonable fire surface layout greatly increases the bearing capacity of the cylinder head to the alternating thermal load and mechanical load, and is more suitable for The working process of the direct-injection combustion of the small diesel engine is improved; the overall size of the cylinder head is more reasonable in length, width and height, which is beneficial to strengthening cooling, improving rigidity, and arranging intake and exhaust passages.

Description of drawings

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

Fig. 1 is the structural representation of the fire surface of the utility model cylinder head.

Fig. 2 is a schematic cross-sectional structure diagram of the intake and exhaust valves and the air passage of the cylinder head of the utility model.

Fig. 3 is a structural schematic diagram of the installation position of the fuel injector hole of the cylinder head of the utility model.

Fig. 4 is the back view of the utility model cylinder head.

Fig. 5 is a schematic diagram of the shape and structure of the tail inlet of the helical inlet of the cylinder head of the utility model.

Fig. 6 is a schematic diagram of the arrangement structure of the hidden oil passage of the cylinder head of the present invention.

Fig. 7 is a schematic diagram (partial) of the cross-sectional structure taken along N-N direction in Fig. 6 .

In the figure: 1. Cylinder head 2. Spiral intake passage 3. Intake valve 4. Exhaust valve 5. Injector hole 6. Dark oil passage

Detailed ways

A cylinder head 1 of a small direct-injection diesel engine, as shown in Fig. The total height H of 1 is 62-64mm, the total length L is 144-146mm, the total width B is 114-116mm, and the thickness c2 of the fire surface bottom plate is 7-8mm; if a two-dimensional coordinate system is established with the center of the upper plane of the cylinder head as the origin, Then the distance x1 from the central axis of the intake valve 3 to the Y-axis of the coordinate axis is 18-19mm, the throat diameter d1 of the intake passage is 28-30mm, and the distance x2 from the central axis of the exhaust valve 4 to the Y-axis of the coordinate axis is 20-21mm , the throat diameter d2 of the exhaust passage is 22-24 mm, the distance y1 from the center line of the intake and exhaust valves to the coordinate axis X-axis is 5-7 mm; the injector hole 5 is arranged at the center line of the intake and exhaust valves On the opposite side, the distance x3 from the central axis of the injector hole (5) to the Y-axis is 1-1.5 mm, and the distance y3 to the X-axis is 6-7 mm; the installation angle α of the injector hole is 17°-20°, The installation deflection angle β is 45°-50°, the thickness c1 of the nose bridge area is 8-9 mm, and the height h4 is 14-16 mm.

The throat diameter d1 of the head of the spiral inlet 2 is 28-30 mm, the diameter d3 of the turning part is 24-26 mm, the tail is trapezoidal in section, the upper bottom k is 29-30 mm, the lower bottom p is 32-33 mm, and the height h6 is 28~30mm, the height h1 of the central axis of the spiral inlet (2) relative to the upper plane of the cylinder head is 30~32mm, and the eccentricity h5 relative to the center line of the intake and exhaust valves is 24~27mm; the spiral inlet 2 The ratio of the cross-sectional area of the head throat to the tail is 1.2-1.4, the height h2 of the spiral chamber at the turning part is 20-23 mm, and the height h3 of the air guide screen is 5-7 mm.

A dark oil passage is arranged on the exhaust side of the cylinder head 1 . The lubricating oil from the hidden oil passage of the body enters the hidden oil passage with a diameter of 7mm on the bottom surface of the cylinder head, and then enters the hidden oil passage with a diameter of 5mm at 90° on the top surface of the cylinder head, and then enters the hollow pin of the cylinder head cover to Oil drips from the cylinder head cover to lubricate the valve rocker arm assembly.

According to the characteristics of the direct injection combustion method, the design and structure of the cylinder head can effectively guarantee its own strength and rigidity; its reasonable fire surface layout greatly increases the bearing capacity of the cylinder head to the alternating thermal load and mechanical load, and is more suitable for The working process of direct-injection combustion of small diesel engines is clarified; the overall size of the cylinder head is more reasonable in length, width, and height, which is beneficial to enhanced cooling, improved rigidity, and arrangement of intake and exhaust ports; after the overall size is determined, the right side of the cylinder head is arranged The spiral intake port, intake valve guide rail, and intake valve seat hole are arranged, and the exhaust port, exhaust valve guide rail, and exhaust valve seat hole are arranged on the left side of the cylinder head, and the connecting line between the center of the intake and exhaust valve holes Relative to the cylinder centerline deviates downward, the P-type fuel injector hole deviates upward relative to the cylinder centerline and deviates to the exhaust side, and the injector has an appropriate installation angle and deflection angle. In addition, a number of water channel holes are reasonably arranged on the cylinder head, and a dark oil channel is arranged at the same time as a channel for lubricating oil to provide lubricating oil to the valve rocker arm assembly in the cylinder head cover.

Claims (3)

1. the cylinder head of a small DI diesel engine (1), has spiral inlet duct (2), fire power face is provided with intake valve (3), exhaust valve (4) and oil injector hole (5), it is characterized in that: the height overall H of cylinder head (1) is 62～64mm, length overall L is 144～146mm, beam overall B is 114～116mm, and fire power face base plate thickness c2 is 7～8mm; If with planar central on the cylinder head is that initial point is set up two-dimensional coordinate system, then intake valve (3) central axis is 18～19mm to the coordinate axes Y-axis apart from x1, intake duct throat diameter d1 is 28～30mm, exhaust valve (4) central axis is 20～21mm to the coordinate axes Y-axis apart from x2, air outlet flue throat diameter d2 is 22～24mm, and the inlet and outlet door line of centres is 5～7mm to the distance y 1 of coordinate axes X-axis; Oil injector hole (5) is arranged in a relative side of the inlet and outlet door line of centres, and oil injector hole (5) central axis is 1～1.5mm to Y-axis apart from x3, is 6～7mm to the distance y 3 of X-axis; Oil sprayer duct established angle α is 17 °～20 °, and it is 45 °～50 ° that angle of yaw β is installed, and bridge of the nose district thickness c1 is 8～9mm, and height h4 is 14～16mm.

2. the cylinder head of small DI diesel engine according to claim 1 (1), it is characterized in that: the head throat diameter d1 of described spiral inlet duct (2) is 28～30mm, turning part diameter d 3 is 24～26mm, afterbody is the trapezoid cross section, upper base k is 29～30mm, and the p that goes to the bottom is 32～33mm, and high h6 is 28～30mm, spiral inlet duct (2) central axis is 30～32mm with respect to the height h1 of cylinder cover upper planar surface, is 24～27mm with respect to the throw of eccentric h5 of the inlet and outlet door line of centres; Spiral inlet duct (2) head aditus laryngis is 1.2～1.4 with the ratio of the sectional area of afterbody, and turning part volute height h2 is 20～23mm, and air guide screen height h3 is 5～7mm.

3. the cylinder head of small DI diesel engine according to claim 1 (1) is characterized in that: be furnished with dark oil duct at cylinder head (1) exhaust side.

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