CN210217895U

CN210217895U - Semispherical combustion chamber with combustion step for gasoline engine

Info

Publication number: CN210217895U
Application number: CN201921147047.5U
Authority: CN
Inventors: Lu Yang; 杨璐; Yingqing Zhang; 张颖卿
Original assignee: Leo Group Co ltd
Current assignee: Leo Group Co ltd; Leo Group Zhejiang Pump Co Ltd
Priority date: 2019-07-19
Filing date: 2019-07-19
Publication date: 2020-03-31
Anticipated expiration: 2029-07-19

Abstract

The utility model belongs to the technical field of the gasoline engine, a hemisphere combustion chamber that gasoline engine contains burning step is related to, including the cylinder head body, this internal (air) intake valve and the exhaust valve of being provided with of cylinder head reaches intake duct that links to each other with the (air) intake valve, the exhaust passage that links to each other with the exhaust valve, this internal hemispherical combustion chamber that is provided with of cylinder head, intake valve and exhaust valve are located same one side of combustion chamber, and the spark plug mounting hole sets up the opposite side at the combustion chamber, the combustion chamber bottom of (air) intake valve and exhaust valve one side is provided with burning step, the combustion chamber bottom of spark plug mounting hole one side is provided with little camber transition surface, and the transition surface makes the combustion. The utility model provides a gasoline engine contains the hemisphere combustion chamber of burning step, reduces the incomplete combustion of mist in the clearance of piston top bank, reaches the optimization burning, promotes the purpose of petrol engine power and fuel utilization ratio.

Description

Semispherical combustion chamber with combustion step for gasoline engine

Technical Field

The utility model belongs to the technical field of the gasoline engine, a gasoline engine contains hemisphere combustion chamber of burning step is related to.

Background

A gasoline engine is a common power device, which is powered by energy converted by burning fuel, and therefore, a combustion chamber of the gasoline engine plays an important role in the whole gasoline engine. The existing gasoline engine combustion chamber has incomplete combustion of mixed gas, low fuel utilization rate and poor power of the gasoline engine, which are always the problems that people pay attention to and try to solve. Factors influencing combustion efficiency mainly comprise the structure and shape of a combustion chamber, the shape and layout of an air inlet and exhaust channel, the size and layout of an air inlet valve and an air outlet valve, the matching mode of a rocker arm rod and the like.

The Chinese patent application CN108825354A discloses a gasoline engine combustion chamber, which comprises a combustion chamber body, wherein the combustion chamber body adopts a spherical combustion chamber, a spark plug mounting hole, an air inlet valve hole and an air outlet valve hole are arranged on the combustion chamber body, the air inlet valve hole and the air outlet valve hole are arranged on the same horizontal line, and the spark plug mounting hole is arranged in the middle of the upper ends of the air inlet valve hole and the air outlet valve hole. This patent is through improving the shape of combustion chamber, changes the basin shape combustion chamber into spherical combustion chamber, gets rid of some not smooth edges and corners of transition in the combustion chamber, makes the burning more abundant to improve its burning, optimize the emission of gasoline engine. The effect is still not ideal, especially the piston top land clearance exists in the combustion chamber, and the mixture is not completely combusted.

SUMMERY OF THE UTILITY MODEL

The utility model discloses to prior art's not enough, provide a gasoline engine contains the hemisphere combustion chamber of burning step, reduce the incomplete combustion of gas mixture in the clearance of piston top bank, reach the optimization burning, promote the purpose of petrol engine power and fuel utilization ratio.

In order to solve the above technical problem, the purpose of the present invention can be achieved by the following technical solutions:

the utility model provides a gasoline engine contains hemisphere combustion chamber of burning step, includes the cylinder head body, this internal intake valve and the exhaust valve of being provided with of cylinder head, and the intake duct that links to each other with the intake valve, the exhaust passage that links to each other with the exhaust valve, this internal hemispherical combustion chamber that is provided with of cylinder head, intake valve and exhaust valve are located same one side of combustion chamber, and the spark plug mounting hole sets up the opposite side at the combustion chamber, the combustion chamber bottom of intake valve and exhaust valve one side is provided with the burning step, the combustion chamber bottom of spark plug mounting hole one side is provided with little camber transition face, and the transition face makes the combustion chamber form a kind of hemispherical structure.

The intake and exhaust valves have the same center height.

The intake valve is sleeved with an intake valve seat ring, the exhaust valve is sleeved with an exhaust valve seat ring, and the outer rings of the intake valve seat ring and the exhaust valve seat ring are intersected with the circumferential contour line of the combustion chamber at the bottom cylinder surface.

The diameter of the combustion chamber at the bottom cylinder surface is 85-95% of the diameter of the cylinder.

The intake valve seat ring and the exhaust valve seat ring are arranged at intervals, and the wall thickness of a cylinder head between the intake valve seat ring and the exhaust valve seat ring is larger than 2 mm.

The connecting part between the air inlet channel and the combustion chamber is tangent and transited.

Rocker shaft mounting holes are arranged below the intake valve and the exhaust valve, the mounted push rod, the rocker shaft and the valve shaft center are in the same straight line, an included angle α is formed between the push rod, the rocker shaft and the valve shaft center and the vertical direction, and the included angle α is 3-10 degrees.

The cylinder head body is provided with four mounting and fixing holes which are fixedly connected with a box body of the gasoline engine through bolts, and positioning pins are placed in two of the mounting and fixing holes for positioning.

Compared with the prior art, the utility model, following beneficial effect has:

1. the utility model redesigns the structure of the combustion chamber, adds a combustion step on one side of the intake valve and the exhaust valve, and reduces the incomplete combustion of the mixed gas in the clearance of the top land of the piston; meanwhile, a small-curvature transition surface is designed on one side of the spark plug to form a hemispherical combustion chamber, so that fuel gas mixture forms a vortex in a compression stroke, turbulent airflow during ignition is reduced, and combustion of the fuel gas mixture is promoted; the diameter of the cylinder surface combustion chamber is 85-95% of the diameter of the cylinder, so that combustion dead angles between the cylinder head combustion chamber and the end surface of the cylinder are avoided; the aims of optimizing combustion and improving the power and the fuel utilization rate of the gasoline engine are fulfilled.

2. The utility model redesigns the size and layout mode of the inlet valve and the exhaust valve in the combustion chamber, increases the axial distance between the inlet valve and the exhaust valve, and meets the requirement that the wall thickness of the cylinder head at the seat ring of the two valves is more than 2mm, thereby ensuring less deformation in the running of the gasoline engine, no air leakage of the valves and reliable running; the junction between intake duct and the combustion chamber is tangent transition, reduces the hindrance effect to admitting air, reaches the effect that increases the air input, forms the vortex of admitting air, optimizes and admits air, makes the burning of fuel oil gas mixture more abundant.

Drawings

Fig. 1 is a perspective view of the present invention;

fig. 2 is a cross-sectional view of the present invention;

fig. 3 is a top view of the present invention;

fig. 4 is a bottom view of the present invention;

fig. 5 is a cross-sectional view of the combustion chamber of the present invention;

FIG. 6 is a schematic view of the positions of the valve, rocker arm and push rod of the present invention;

reference numerals: 1. a cylinder head body; 2. an intake valve; 3. an exhaust valve; 4. an air inlet channel; 5. an exhaust passage; 6. a combustion chamber; 7. a spark plug mounting hole; 8. a combustion step; 9. a transition surface; 10. an intake valve seat ring; 11. an exhaust valve seat ring; 12. a rocker shaft mounting hole; 13. a push rod; 14. a rocker shaft; 15. the axis of the valve; 16. and installing a fixing hole.

Detailed Description

The invention will be further described in the following with reference to specific embodiments thereof, with reference to the accompanying drawings, in which figures 1-6:

the utility model provides a gasoline engine contains hemisphere combustion chamber of burning step, includes cylinder head body 1, is provided with (air) intake valve 2 and exhaust valve 3 in the cylinder head body 1, and intake duct 4 that links to each other with (air) intake valve 2, the exhaust passage 5 that links to each other with exhaust valve 3, be provided with hemispherical combustion chamber 6 in the cylinder head body 1, intake valve 2 and exhaust valve 3 lie in combustion chamber 6 with one side, spark plug mounting hole 7 sets up the opposite side at

combustion chamber

6, 6 bottoms in the combustion chamber of

intake valve

2 and 3 one sides of exhaust valve are provided with burning

step

8, 6 bottoms in the combustion chamber of spark plug mounting hole 7 one side are provided with little camber transition surface 9, and transition surface 9 makes combustion chamber 6 form a kind of hemispherical structure.

Referring to fig. 5, the height of the combustion step 8 is a distance a shown in the drawing. The combustion step 8 is provided to reduce incomplete combustion of the mixture in the piston land clearance.

Referring to fig. 4, the intake valve 2 is sleeved with an intake valve seat ring 10, the exhaust valve 3 is sleeved with an exhaust valve seat ring 11, and the outer rings of the intake valve seat ring 10 and the exhaust valve seat ring 11 are intersected with the circumferential contour line of the combustion chamber 6 at the bottom cylinder surface. The diameter of the combustion chamber 6 at the bottom cylinder surface is 85-95% of the diameter of the cylinder, so that dead combustion angles between the cylinder head combustion chamber 6 and the cylinder end surface are avoided.

Compared with the attached figure 2, the inlet valve seat ring 10 and the exhaust valve seat ring 11 are arranged at intervals, the distance between the axes of the inlet valve 2 and the exhaust valve 3 is set as the distance c, and the requirement that the cylinder head wall thickness between the inlet valve seat ring 10 and the exhaust valve seat ring 11 is larger than 2mm is met, so that the gasoline engine is less in deformation in operation, the air valves are not air-tight, and the gasoline engine is reliable in operation. The junction between the air inlet channel 4 and the combustion chamber 6 is tangent and transited, the blocking effect on air inlet is reduced, and the effects of increasing air inlet amount, forming air inlet vortex and optimizing air inlet are achieved.

Referring to fig. 6, rocker shaft mounting holes 12 are arranged below the intake valve 2 and the exhaust valve 3, the mounted push rod 13, the rocker shaft 14 and the valve shaft center 15 are in the same straight line, and form an included angle α with the vertical direction, wherein the included angle α is 3-10 degrees, so as to ensure that the contact point of the rocker and the valve (or the top cap) is on the valve shaft center 15, so that the operation is more stable, and the control of the rocker is more reliable.

The cylinder head body is provided with four mounting and fixing holes 16 which are fastened and connected with a box body of the gasoline engine through bolts, and positioning pins are placed in two of the mounting and fixing holes 16 for positioning.

The above-mentioned embodiment is only the preferred embodiment of the present invention, and does not limit the protection scope of the present invention according to this, so: all equivalent changes made according to the structure, shape and principle of the utility model are covered within the protection scope of the utility model.

Claims

1. The utility model provides a gasoline engine contains hemisphere combustion chamber of burning step, includes cylinder head body (1), is provided with (2) intake valve and exhaust valve (3) in the cylinder head body (1), and intake duct (4) that link to each other with intake valve (2), exhaust passage (5) that link to each other with exhaust valve (3), its characterized in that, be provided with hemisphere combustion chamber (6) in cylinder head body (1), intake valve (2) and exhaust valve (3) are located combustion chamber (6) with one side, and spark plug mounting hole (7) set up the opposite side at combustion chamber (6), combustion chamber (6) bottom of intake valve (2) and exhaust valve (3) one side is provided with burning step (8), combustion chamber (6) bottom of spark plug mounting hole (7) one side is provided with little camber transition face (9).

2. The semispherical combustion chamber containing the combustion step of the gasoline engine as defined in claim 1, wherein an intake valve seat ring (10) is sleeved on the intake valve (2), an exhaust valve seat ring (11) is sleeved on the exhaust valve (3), and the outer rings of the intake valve seat ring (10) and the exhaust valve seat ring (11) intersect with the circumferential contour line of the combustion chamber (6) at the bottom cylinder surface.

3. The semispherical combustion chamber with combustion steps of a gasoline engine as recited in claim 2, characterized in that the diameter of the combustion chamber (6) at the bottom cylinder surface is 85% -95% of the cylinder diameter.

4. The semispherical combustion chamber with combustion steps of a gasoline engine as set forth in claim 2, characterized in that the intake valve seat ring (10) and the exhaust valve seat ring (11) are spaced apart from each other with a cylinder head wall thickness greater than 2 mm.

5. The semispherical combustion chamber with combustion steps for a gasoline engine as set forth in claim 1, characterized in that the junction between the intake port (4) and the combustion chamber (6) is tangent.

6. The semispherical combustion chamber with the combustion steps of the gasoline engine as recited in claim 1, characterized in that rocker shaft mounting holes (12) are arranged below the intake valve (2) and the exhaust valve (3), and the mounted push rod (13), rocker shaft (14) and valve shaft center (15) are in the same straight line and form an included angle α with the vertical direction.

7. The semispherical combustion chamber with the combustion step of the gasoline engine as recited in claim 1, characterized in that the cylinder head body (1) is provided with four mounting and fixing holes (16) which are fastened and connected with a tank body of the gasoline engine through bolts, and positioning pins are placed in two of the mounting and fixing holes (16).