CN111692009A

CN111692009A - Cylinder cover

Info

Publication number: CN111692009A
Application number: CN202010689958.1A
Authority: CN
Inventors: 蔡小伟; 覃文; 杨占林; 潘昊
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2020-07-17
Filing date: 2020-07-17
Publication date: 2020-09-22
Anticipated expiration: 2040-07-17

Abstract

The invention discloses a cylinder cover, belongs to the field of diesel engine parts and solves the problem that the air inflow is inconvenient to adjust due to a single air inlet channel and an air exhaust channel of the traditional cylinder cover. This cylinder head includes the cylinder head body, cylinder head body one side be equipped with the exhaust passage, cylinder head body opposite side be equipped with independent setting's first intake duct and second intake duct, exhaust passage one end be connected simultaneously with two exhaust valves, first intake duct, second intake duct one end correspond respectively and connect an (air) intake valve, be equipped with the sprayer mounting hole in the region that exhaust valve, (air) intake valve enclose. The cylinder cover is provided with two independent air inlet channels, so that the air inflow is convenient to adjust, and the low-speed performance of the diesel engine is improved.

Description

Cylinder cover

Technical Field

The invention relates to a diesel engine part, in particular to a cylinder cover.

Background

At present, a cylinder cover used by a diesel engine generally comprises an air inlet channel and an air outlet channel, and in a four-valve type, the air inlet channel and the air outlet channel are only provided with one independent air inlet channel and one independent air outlet channel, and the air inlet channel and the air outlet channel are respectively and correspondingly connected with two exhaust valves. The gas entering from the side of the gas inlet pipe cannot be independently controlled, so that the control flexibility of the gas inflow is not high, and particularly, the low-speed performance is limited because the displacement is low and the gas inflow is sensitive, the adjustment of the gas inflow is limited and the low-speed performance is limited in a light diesel engine such as a single-cylinder diesel engine, so that the corresponding function cannot be achieved and is inconvenient to use.

Disclosure of Invention

The invention aims to solve the technical problem of the prior art and provides a cylinder cover which is convenient for adjusting air inflow so as to improve the low-speed performance of a diesel engine.

The technical scheme of the invention is as follows: the utility model provides a cylinder head, includes the cylinder head body, cylinder head body one side be equipped with the exhaust passage, cylinder head body opposite side be equipped with independent setting's first intake duct and second intake duct, exhaust passage one end be connected simultaneously with two exhaust valves, first intake duct, second intake duct one end correspond respectively and connect an (air) intake valve, be equipped with the sprayer mounting hole in the region that exhaust valve, (air) intake valve enclose.

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

Furthermore, one ends of the first air inlet channel and the second air inlet channel, which are close to the air inlet valve, are tangent to the cylinder hole of the cylinder body.

Furthermore, a heating plug mounting hole is formed in the cylinder cover body at the other end of the exhaust passage.

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

Further, the sectional area of first intake duct reduces earlier, increase after along (air) intake valve one end from cylinder cap body air inlet, and first intake duct reduces in the tip part that is close to the (air) intake valve, the sectional area of second intake duct reduces along (air) intake valve one end from cylinder cap body air inlet gradually, and the second intake duct is in the tip part increase that is close to the (air) intake valve, the sectional area of exhaust passage reduces after along (air) exhaust valve one end from cylinder cap body gas vent, and the exhaust passage is in the tip part increase that is close to the exhaust valve.

Advantageous effects

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

according to the cylinder cover, the two first air inlet channels and the second air inlet channels which are independently arranged are arranged on the cylinder cover body and are respectively connected with the air inlet valve, so that the cylinder cover can be applied to a light micro engine, one of the air inlet channels can be independently closed according to actual requirements, the air inflow is convenient to adjust, and the low-speed performance of a diesel engine is improved; meanwhile, the mode that the first air inlet channel and the second air inlet channel tangentially admit air is matched with a structure arranged in the oil sprayer mounting hole, so that oil spraying of the oil sprayer is uniform, oil bundles are uniformly distributed, oil and gas are well mixed, combustion is more sufficient, the emission of an engine can be more easily up to the standard, and meanwhile, the dynamic performance and the economic performance meet certain requirements.

Drawings

FIG. 1 is a schematic view of the structure of one side of the present invention;

FIG. 2 is a schematic view of another embodiment of the present invention;

FIG. 3 is a schematic sectional view of the intake and exhaust passages according to the present invention.

Wherein: the cylinder head comprises a cylinder head body 1, an exhaust passage 2, a first air inlet passage 3, a second air inlet passage 4, an exhaust valve 5, an oil sprayer mounting hole 6, a heating plug mounting hole 7 and an intake valve 8.

Detailed Description

The invention will be further described with reference to specific embodiments shown in the drawings.

Referring to fig. 1-3, the cylinder head of the present invention comprises a cylinder head body 1, an exhaust passage 2 is arranged on one side of the cylinder head body 1, a first intake passage 3 and a second intake passage 4 which are independently arranged are arranged on the other side of the cylinder head body 1, the first intake passage 3 and the second intake passage 4 are arranged in parallel, wherein one end of the exhaust passage 2 is connected with two exhaust valves 5 simultaneously for facilitating exhaust, one end of the first intake passage 3 and one end of the second intake passage 4 are respectively connected with an intake valve 8 correspondingly, the four-valve structure is provided with sufficient intake and higher power density, the opening and closing of the first intake passage 3 can be controlled by an additional intake pipe, an EGR valve and an electronic throttle valve to realize low-speed performance requirements and special requirements of customers (such as low-speed vibration, noise control, etc.), a fuel injector mounting hole 6 is arranged in a region surrounded by the exhaust valve 5, so that the fuel injector is centrally disposed in the cylinder bore.

Preferably, the length of the first inlet 3 is smaller than the length of the second inlet 4; one ends of the first air inlet channel 3 and the second air inlet channel 4, which are close to the air inlet valve 8, are tangent to the cylinder holes of the cylinder body, so that air enters tangentially, and air inlet is more sufficient.

Preferably, still be equipped with heating plug mounting hole 7 on the cylinder cap body 1 of the exhaust passage 2 other end, can guarantee to install the heating plug from spatial structure, also can be compatible when the performance test installs the detonation pressure sensor simultaneously, it is very convenient to use.

Preferably, a water inlet is arranged on the bottom surface of the cylinder cover body 1, and a water outlet is arranged above the side surface of the cylinder cover body 1, wherein the water inlet is communicated with the water outlet through a water channel in the cylinder cover body 1, so that water flows upwards from bottom to top, and the gas in the cooling liquid is convenient to overflow.

Preferably, the sectional area of the first air inlet channel 3 is firstly reduced and then increased from the air inlet of the cylinder cover body 1 along one end of the air inlet valve 8, and the first air inlet channel 3 is locally reduced at the end part close to the air inlet valve 8; the sectional area of the second air inlet channel 4 is gradually reduced from the air inlet of the cylinder cover body 1 along one end of the air inlet valve 8, the second air inlet channel 4 is locally enlarged at the end part close to the air inlet valve 8, the air flow rate and the resistance can be controlled, so that the comprehensive effect of better flow coefficient and vortex can be obtained, the oil-gas mixing efficiency is further improved, and therefore the combination of ideal economy and exhaust temperature is obtained, the sectional area of the exhaust channel 2 is firstly enlarged and then reduced from the air outlet of the cylinder cover body 1 along one end of the exhaust valve 5, and the exhaust channel 2 is locally enlarged at the end part close to the exhaust valve 5.

According to the cylinder cover, the two first air inlet channels 3 and the second air inlet channels 4 which are independently arranged are arranged on the cylinder cover body 1 and are respectively connected with the air inlet valve 8, so that the cylinder cover can be applied to a light micro engine, one of the air inlet channels can be independently closed according to actual requirements, the air inflow is convenient to adjust, and the low-speed performance of a diesel engine is improved; meanwhile, the mode that the first air inlet channel 3 and the second air inlet channel 4 tangentially admit air is matched with the structure arranged in the oil sprayer mounting hole 6, so that oil spraying of the oil sprayer is uniform, oil bundles are uniformly distributed, oil and gas are well mixed, combustion is more sufficient, the emission of an engine can be more up to the standard, and meanwhile, the dynamic property and the economic performance meet certain requirements.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art can make various changes and modifications without departing from the structure of the invention, which will not affect the effect of the invention and the practicability of the patent.

Claims

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).