CN111692009A - Cylinder cover - Google Patents

Abstract

The invention discloses a cylinder head, which belongs to the field of diesel engine parts, and solves the problem of inconvenient adjustment of the intake air volume caused by the single intake port and exhaust port of the traditional cylinder head. The cylinder head includes a cylinder head body, one side of the cylinder head body is provided with an exhaust port, the other side of the cylinder head body is provided with a first intake port and a second intake port independently arranged, the One end of the exhaust port is connected with two exhaust valves at the same time, one end of the first intake port and the second intake port are respectively connected to an intake valve, and the exhaust valve and the intake valve are surrounded by a corresponding intake valve. There are injector mounting holes in the area. The cylinder head of the present invention is provided with two independent air intake passages, which facilitates the adjustment of the intake air volume and improves the low-speed performance of the diesel engine.

Description

a cylinder head

technical field

The present invention relates to diesel engine parts, more particularly, it relates to a cylinder head.

Background technique

At present, the cylinder head used by diesel engines is generally a cylinder containing one intake port and one exhaust port. In the four-valve model, there is only one independent intake port and exhaust port. The intake port and exhaust port are respectively Correspondingly connect the two exhaust valves. The gas coming in from the intake pipe side cannot be independently controlled, resulting in a low degree of flexibility in controlling the intake air volume, especially for mild diesel engines, such as single-cylinder diesel engines, because of their low displacement, they are more sensitive to the intake air volume. The adjustment of the controller is limited, and the low-speed performance is also limited, so that the corresponding functions cannot be achieved and realized, and the use is relatively inconvenient.

SUMMARY OF THE INVENTION

The technical problem to be solved by the present invention is to provide a cylinder head for the above-mentioned deficiencies of the prior art, which is convenient for adjusting the intake air amount, so as to improve the low-speed performance of the diesel engine.

The technical solution of the present invention is as follows: a cylinder head includes a cylinder head body, one side of the cylinder head body is provided with an exhaust passage, and the other side of the cylinder head body is provided with an independently arranged first inlet an air port and a second intake port, one end of the exhaust port is connected with two exhaust valves at the same time, one end of the first intake port and one end of the second intake port are respectively connected to an intake valve, the said There are injector mounting holes in the area enclosed by the exhaust valve and the intake valve.

As a further improvement, the length of the first intake passage is smaller than the length of the second intake passage.

Further, both ends of the first intake port and the second intake port that are close to the intake valve are tangent to the cylinder bore of the cylinder block.

Further, the cylinder head body at the other end of the exhaust passage is also provided with a heating plug installation hole.

Further, the bottom surface of the cylinder head body is provided with a water inlet, the upper side of the cylinder head body is provided with a water outlet, and the water inlet is communicated with the water outlet through a water channel in the cylinder head body.

Further, the cross-sectional area of the first intake port first decreases and then increases from the intake port of the cylinder head body along one end of the intake valve, and the first intake port is partially reduced at the end near the intake valve. Small, the cross-sectional area of the second intake port gradually decreases from the intake port of the cylinder head body along one end of the intake valve, and the second intake port increases locally at the end near the intake valve, and the exhaust port The cross-sectional area of the passage increases first and then decreases from the exhaust port of the cylinder head body along one end of the exhaust valve, and the exhaust passage increases locally at the end near the exhaust valve.

beneficial effect

Compared with the prior art, the present invention has the following advantages:

The cylinder head of the present invention can be applied to a light engine and can be closed independently according to actual needs by setting two independently arranged first intake ports and second intake ports on the cylinder head body to be connected to the intake valve respectively. One of the intake ports is easy to adjust the intake air volume to improve the low-speed performance of the diesel engine; at the same time, the first intake port and the second intake port are tangentially intake air, in line with the structure of the injector mounting hole in the middle , which can make the fuel injector spray evenly, the oil beam distribution is even, the oil and gas are well mixed, the combustion is more sufficient, the engine emission can be easier to meet the standard, and the power performance and economic performance can meet certain requirements.

Description of drawings

Fig. 1 is the structural representation of one side of the present invention;

Fig. 2 is the structural representation of the other side of the present invention;

FIG. 3 is a schematic cross-sectional structure diagram of an intake port and an exhaust port in the present invention.

Among them: 1- cylinder head body, 2- exhaust port, 3- first intake port, 4- second intake port, 5- exhaust valve, 6- fuel injector mounting hole, 7- heating plug mounting hole , 8 - intake valve.

Detailed ways

The present invention will be further described below with reference to the specific embodiments in the accompanying drawings.

1-3, a cylinder head of the present invention includes a cylinder head body 1, an exhaust passage 2 is provided on one side of the cylinder head body 1, and an independently arranged first inlet is provided on the other side of the cylinder head body 1. The air passage 3 and the second air inlet passage 4, the first air inlet passage 3 and the second air inlet passage 4 are arranged side by side, wherein one end of the exhaust passage 2 is connected with the two exhaust valves 5 at the same time, which is convenient for exhausting. One end of the intake port 3 and the second intake port 4 is respectively connected to an intake valve 8. The four-valve structure has sufficient intake air and higher power density. The first intake pipe, EGR valve and electronic throttle valve can be added to control the first valve. The opening and closing of the intake port 3 is used to achieve low-speed performance requirements and special requirements of customers (such as low-speed vibration, noise control, etc.), and fuel injectors are provided in the area surrounded by exhaust valve 5 and intake valve 8 The installation hole 6 is used to install the fuel injector, so that the fuel injector is placed in the center of the cylinder hole.

Preferably, the length of the first intake port 3 is less than the length of the second intake port 4; the ends of the first intake port 3 and the second intake port 4 that are close to the intake valve 8 are both in line with the cylinder bore of the cylinder block. Cut, so that the gas enters tangentially, and the air intake is more sufficient.

Preferably, the cylinder head body 1 at the other end of the exhaust port 2 is also provided with a heating plug installation hole 7, which can ensure the installation of the heating plug from the spatial structure, and can also be compatible with the installation of the explosion pressure sensor during the performance test. convenient.

Preferably, a water inlet is provided on the bottom surface of the cylinder head body 1, and a water outlet is provided above the side surface of the cylinder head body 1, wherein the water inlet is communicated with the water outlet through the water channel in the cylinder head body 1, so that the water flows from bottom to top , which is convenient for the gas in the coolant to escape.

Preferably, the cross-sectional area of the first intake port 3 decreases first and then increases from the intake port of the cylinder head body 1 along one end of the intake valve 8 , and the first intake port 3 is at the end close to the intake valve 8 . The cross-sectional area of the second intake port 4 gradually decreases from the intake port of the cylinder head body 1 along one end of the intake valve 8, and the second intake port 4 increases locally at the end near the intake valve 8. It can control the gas flow rate and resistance, so that the combined effect of flow coefficient and eddy current can be obtained, and the mixing efficiency of oil and gas can be further improved, so as to obtain the combination of ideal economy and exhaust temperature. 1 The exhaust port first increases and then decreases along one end of the exhaust valve 5, and the exhaust port 2 increases locally at the end near the exhaust valve 5, because there is an air port generated by two exhaust valves 5 The process of merging, but the cross-sectional area of the exhaust port of the cylinder head body is set larger than the cross-sectional area of the air passage at a single exhaust valve, which can control the required exhaust flow rate and pressure.

The cylinder head of the present invention can be applied to a light-duty engine by arranging two independently arranged first intake passages 3 and second intake passages 4 on the cylinder head body 1 to be connected to the intake valve 8 respectively. It is actually required to close one of the intake ports separately, which is convenient to adjust the intake air volume and improve the low-speed performance of the diesel engine; at the same time, the first intake port 3 and the second intake port 4 are tangentially intake air, with the injector The structure in the middle of the mounting hole 6 can make the fuel injector spray evenly, the oil beam is evenly distributed, the oil and gas are well mixed, and the combustion is more sufficient, so that the engine emission can be easier to meet the standard, and the power performance and economic performance can meet certain requirements.

The above are only the preferred embodiments of the present invention. It should be pointed out that for those skilled in the art, without departing from the structure of the present invention, several modifications and improvements can be made, which will not affect the implementation of the present invention. effect and the applicability of the patent.

Claims (6)

1. The utility model provides a cylinder head, includes cylinder head body (1), cylinder head body (1) one side be equipped with exhaust passage (2), its characterized in that, cylinder head body (1) opposite side be equipped with first intake duct (3) and second intake duct (4) of independent setting, exhaust passage (2) one end be connected simultaneously with two exhaust valves (5), first intake duct (3), second intake duct (4) one end correspond respectively and connect an (8) intake valve, be equipped with sprayer mounting hole (6) in the region that exhaust valve (5), (8) enclose.

2. A cylinder head according to claim 1, characterized in that the length of the first inlet channel (3) is smaller than the length of the second inlet channel (4).

3. A cylinder head according to claim 1, characterized in that the ends of the first inlet channel (3) and the second inlet channel (4) close to the inlet valve (8) are tangential to the bore of the cylinder block.

4. A cylinder head according to any one of claims 1 to 3, characterized in that a plug mounting hole (7) is provided in the head body (1) at the other end of the exhaust passage (2).

5. The cylinder cover according to claim 4, characterized in that the bottom of the cylinder cover body (1) is provided with a water inlet, the side of the cylinder cover body (1) is provided with a water outlet, and the water inlet is communicated with the water outlet through a water channel in the cylinder cover body (1).

6. A cylinder head according to claim 1, characterized in that the cross-sectional area of the first inlet channel (3) decreases first and then increases from the inlet opening of the cylinder head body (1) along one end of the inlet valve (8), and the first inlet channel (3) decreases locally at the end near the inlet valve (8), the cross-sectional area of the second inlet channel (4) decreases gradually from the inlet opening of the cylinder head body (1) along one end of the inlet valve (8), and the second inlet channel (4) increases locally at the end near the inlet valve (8), the cross-sectional area of the exhaust channel (2) increases first and then decreases from the outlet opening of the cylinder head body (1) along one end of the exhaust valve (5), and the exhaust channel (2) increases locally at the end near the exhaust valve (5).

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