Novel intake tumble flow structure for engine

Abstract

The application discloses a novel engine air intake rolling flow structure, which comprises an engine cylinder body, an air intake passage, an exhaust passage, an exhaust valve, an air intake valve and an eccentric counterbore. A piston is arranged in the engine cylinder body, and the top of the engine cylinder body is a plane. The air intake passage is arranged on the top of the engine cylinder body. The exhaust passage is arranged on the top of the engine cylinder body, and the exhaust passage and the air intake passage are symmetrically arranged. The exhaust valve is arranged at the end of the exhaust passage. The air intake valve is arranged at the end of the air intake passage, and the air intake valve is higher than the exhaust valve. The eccentric counterbore is arranged below the air intake valve. Therefore, the novel engine air intake rolling flow structure is simple and reasonable in structure, the rolling flow effect is improved, the height of the cylinder cover is not increased, and the arrangement of the valve mechanism on the top of the cylinder cover is not affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of piston internal combustion engine, in particular to a new type of intake tumble flow structure of engine. BACKGROUND

[0002] Piston internal combustion engine relies on the explosion pressure of fuel to push the piston reciprocating in the cylinder hole, and then converts the linear motion into rotary motion through the crank mechanism to output torque. In order to improve the performance of piston internal combustion engine, it is necessary to organize the intake flow, and the cylinder flow movement is divided into two forms: vortex and tumble. The organized flow movement around the cylinder axis generated during the intake process is called vortex, which is mainly used in diesel engine; it is a kind of cylinder flow movement, and the flow direction is perpendicular to the cylinder axis, which is called tumble, which is mainly used in gasoline engine and gas engine.

[0003] As shown in Figure 1 , the current tumble flow is mainly obtained by relying on the dome combustion chamber, that is, the top of the combustion chamber (engine cylinder body 1) is made into a bowl-shaped space with a reverse buckle, the intake valve 6 is inclined, and the intake mainly passes through the intake valve 6, then flows down along the intake side cylinder wall, and then flows back to the exhaust side after reaching the top of the piston 2, and then flows up along the exhaust side cylinder wall to the exhaust valve 5; a small amount of intake forms a micro-tumble flow and directly flows to the exhaust valve 5. There are also air guide screens or air guide rails on the intake valve 6 or the top surface of the piston 2 to enhance the tumble effect, but the key is still the dome combustion chamber and the inclined intake valve 6. Although such structure can obtain good tumble effect, because the intake needs to have a downward trend, the intake port needs to be more close to the vertical angle than the vortex intake port, which leads to the increase of the height of the cylinder head, and the high inlet of the intake port 3 and the inclined intake valve 6 cause difficulties or influence on the arrangement of the valve mechanism on the top of the cylinder head.

[0004] The information disclosed in this BACKGROUND section is only for the purpose of increasing the understanding of the background of the present application and should not be taken as admitting that the information forms prior art that is already known to those of ordinary skill in the art. SUMMARY

[0005] The present application aims to provide a new type of intake tumble flow structure of engine, which has simple and reasonable structure, improves the tumble effect, and does not increase the height of the cylinder head, thereby avoiding the difficulties or influence on the arrangement of the valve mechanism on the top of the cylinder head.

[0006] To achieve the above object, the present application provides a novel engine intake tumble flow structure, comprising: an engine cylinder block, an intake port, an exhaust port, an exhaust valve, an intake valve and an eccentric sink hole. The engine cylinder block is provided with a piston, and the top of the engine cylinder block is flat. The intake port is arranged on the top of the engine cylinder block. The exhaust port is arranged on the top of the engine cylinder block, and the exhaust port is symmetrically arranged with the intake port. The exhaust valve is arranged at the end of the exhaust port. The intake valve is arranged at the end of the intake port, and the intake valve is higher than the exhaust valve. The eccentric sink hole is arranged below the intake valve.

[0007] In an embodiment of the present application, an eccentric bevel chamfer is arranged at the outlet of the eccentric sink hole.

[0008] In an embodiment of the present application, the novel engine intake tumble flow structure further comprises an intake valve seat ring arranged on the end of the intake port.

[0009] In an embodiment of the present application, the intake valve seat ring is located above the eccentric sink hole.

[0010] In an embodiment of the present application, the novel engine intake tumble flow structure further comprises an exhaust valve seat ring arranged on the end of the exhaust port.

[0011] In an embodiment of the present application, the exhaust valve seat ring is lower than the intake valve seat ring.

[0012] In an embodiment of the present application, the top surface of the piston is flat.

[0013] In an embodiment of the present application, the eccentric sink hole is used to make the intake air move downward along the cylinder wall to form a tumble flow.

[0014] Compared with the prior art, the novel engine intake tumble flow structure according to the present application has a simple and reasonable structure, improves the tumble flow effect, and does not cause the height of the cylinder head to increase, thereby not causing difficulties or affecting the arrangement of the valve mechanism on the top of the cylinder head. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 is a front view structural schematic diagram of the prior intake tumble flow structure.

[0016] Figure 2 is a front view structural schematic diagram of the novel engine intake tumble flow structure according to an embodiment of the present application.

[0017] MAIN REFERENCE MARK EXPLANATION:

[0018] 1-engine cylinder block, 2-piston, 3-intake port, 4-exhaust port, 5-exhaust valve, 6-intake valve, 7- eccentric sink hole, 8-eccentric bevel chamfer, 9-intake valve seat ring, 10-exhaust valve seat ring. DETAILED DESCRIPTION

[0019] The specific embodiments of the present application will be described in detail below with reference to the drawings, but the scope of protection of the present application is not limited by the specific embodiments.

[0020] Unless otherwise clearly indicated, throughout the specification and claims, the terms "comprise", "comprising", "include", "including", "contain", "containing", "have", "having" or the like are understood to be open-ended terms that do not exclude additional elements or components.

[0021] Figure 2 is a front view structural schematic diagram of a novel engine intake tumble flow structure according to an embodiment of the present application. As shown, a novel engine intake tumble flow structure according to a preferred embodiment of the present application comprises an engine cylinder block 1, an intake port 3, an exhaust port 4, an exhaust valve 5, an intake valve 6, and an eccentric counterbore 7. A piston 2 is arranged in the engine cylinder block, and the top of the engine cylinder block 1 is flat. The intake port 3 is arranged on the top of the engine cylinder block 1. The exhaust port 4 is arranged on the top of the engine cylinder block 1, and the exhaust port 4 is symmetrically arranged with the intake port 3. The exhaust valve 5 is arranged at the end of the exhaust port 4. The intake valve 6 is arranged at the end of the intake port 3, and the intake valve 6 is higher than the exhaust valve 5. The eccentric counterbore 7 is arranged below the intake valve 6. Figure 2

[0022] In an embodiment of the present application, an eccentric bevel chamfer 8 is arranged at the outlet of the eccentric counterbore 7.

[0023] In an embodiment of the present application, the novel engine intake tumble flow structure further comprises an intake valve seat ring 9 arranged at the end of the intake port 3.

[0024] In an embodiment of the present application, the intake valve seat ring 9 is above the eccentric counterbore 7.

[0025] In an embodiment of the present application, the novel engine intake tumble flow structure further comprises an exhaust valve seat ring 10 arranged at the end of the exhaust port 4.

[0026] In an embodiment of the present application, the exhaust valve seat ring 10 is lower than the intake valve seat ring 9.

[0027] In an embodiment of the present application, the top surface of the piston 2 is flat.

[0028] In an embodiment of the present application, the eccentric counterbore 7 is used to make the intake air move downward along the cylinder wall, thereby forming a tumble flow.

[0029] ​In practical application, the new intake rolling flow structure of the engine of the present application lifts the intake valve 6 and the intake valve seat ring 9 at the outlet of the intake port 3, and processes an eccentric counterbore 7 below the intake valve 6. When the air is taken in, the intake air is guided and shielded by the intake valve 6 and the eccentric counterbore 7 below the intake valve 6, so that the intake air forms a downward movement along the cylinder wall, thereby forming rolling flow. In addition, an eccentric bevel chamfer 8 can be further provided at the outlet of the eccentric counterbore 7 to further strengthen the rolling flow effect. The ideal rolling flow effect can be obtained by proper adjustment of the eccentric position, eccentric amount, eccentric chamfer and valve timing, and the performance of the engine is improved.

[0030] In summary, the new intake rolling flow structure of the engine of the present application is simple and reasonable. On the basis of the traditional diesel engine cylinder head intake port 3, only the position of the intake valve 6 is lifted, the total height of the intake port 3 is unchanged, the intake valve 6 is still vertically arranged, the height of the cylinder head and the valve timing mechanism can be unchanged, and the effect of rolling flow scavenging can be achieved. The engine is suitable for engines using rolling flow intake, such as gas engines and two-stroke diesel engines. And the structure parameters can be flexibly adjusted to obtain different rolling flow effects and meet different performance development needs.

[0031] The foregoing description of specific exemplary embodiments of the present application is intended to be illustrative only and is not intended to limit the present application to the precise forms described. Many modifications and variations are possible in light of the above teachings without departing from the spirit or essential characteristics of the present application. The particular exemplary embodiments were chosen and described in order to explain the principles of the present application and its practical application to thereby enable others skilled in the art to best utilize the present application and various embodiments with various modifications as are suited to the particular use contemplated. It is intended that the scope of the present application be defined by the claims and their equivalents.

Claims

1. A novel intake tumble structure for an engine, characterized in that, include: An engine cylinder block, wherein a piston is disposed within the engine cylinder block, and the top of the engine cylinder block is a flat surface; An air intake manifold is located on the top of the engine cylinder block; An exhaust manifold is located on the top of the engine cylinder block, and the exhaust manifold is symmetrically arranged with the intake manifold. An exhaust valve is located at the end of the exhaust duct; An intake valve is located at the end of the intake duct, and the intake valve is higher than the exhaust valve; as well as An eccentric countersunk hole is located below the intake valve; The top surface of the piston is flat. The eccentric countersunk hole is used to allow the intake air to move downward along the cylinder wall, thereby forming a tumble flow.

2. The novel intake tumble structure for engines as described in claim 1, characterized in that, An eccentric chamfer is provided at the outlet of the eccentric countersunk hole.

3. The novel intake tumble structure for engines as described in claim 1, characterized in that, It also includes an intake valve seat ring, which is disposed at the end of the intake duct.

4. The novel intake tumble structure for an engine as described in claim 3, characterized in that, The intake valve seat is located above the eccentric countersunk hole.

5. The novel intake tumble structure for an engine as described in claim 3, characterized in that, It also includes an exhaust valve seat ring, which is disposed on the end of the exhaust passage.

6. The novel intake tumble structure for an engine as described in claim 5, characterized in that, The exhaust valve seat is lower than the intake valve seat.

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