CN217632697U

CN217632697U - Novel air inlet tumble structure of engine

Info

Publication number: CN217632697U
Application number: CN202221738105.3U
Authority: CN
Inventors: 沈捷; 覃壮革; 覃文; 左俊杰; 廖升友
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2022-07-07
Filing date: 2022-07-07
Publication date: 2022-10-21
Anticipated expiration: 2032-07-07

Abstract

The utility model discloses a novel intake tumble structure of engine, include: the engine cylinder comprises an engine cylinder body, an air inlet channel, an exhaust valve, an air inlet 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 inlet passage is arranged on the top of the cylinder body of the engine cylinder. The exhaust passage is arranged on the top of the cylinder body of the engine cylinder, and the exhaust passage and the air inlet passage are symmetrically arranged. The exhaust valve is arranged at the end part of the exhaust passage. The intake valve sets up in the tip of intake duct, and the intake valve is higher than the exhaust valve. And the eccentric counter bore is arranged below the air inlet valve. Therefore, the utility model discloses a novel intake tumble flow structure of engine, simple structure is reasonable, has improved the tumble effect, and can not lead to the high increase of cylinder head, and then can not arrange the valve timing mechanism at cylinder head top and cause difficulty or influence.

Description

Novel air inlet tumble structure of engine

Technical Field

The utility model relates to a piston internal-combustion engine technical field especially relates to a novel intake tumble flow structure of engine.

Background

The piston type internal combustion engine pushes a piston to reciprocate in a cylinder hole by means of the explosion pressure of fuel, and then converts linear motion into rotary motion through a crank mechanism to output torque. In order to improve the performance of the piston type internal combustion engine, the inlet air flow needs to be organized, and the air flow movement mode in the cylinder is divided into a vortex mode and a tumble mode. Organized airflow movement about the cylinder axis, known as swirl, created during intake is commonly used in diesel engines; the air flow is one of the air flow movements in the cylinder, and the air flow direction is vertical to the axis of the cylinder, so the air flow is called tumble flow and is mostly used for gasoline engines and gas engines.

As shown in fig. 1, at present, tumble flow is mainly obtained by means of a roof combustion chamber, that is, the top of the combustion chamber (an engine cylinder block 1) is made into a reversed bowl-shaped space, an intake valve 6 is obliquely arranged, intake air mainly passes through the intake valve 6, then downwards flows along the cylinder wall on the intake side, returns to the exhaust side after reaching the top of a piston 2, upwards flows along the cylinder wall on the exhaust side, and flows to an exhaust valve 5; and a small amount of intake air forms micro-tumble and then directly flows to the exhaust valve 5. And an air guide screen or an air guide edge is arranged on the air inlet valve 6 or the top surface of the piston 2 to enhance the tumble effect, but the key is that a combustion chamber is required to be topped, and the air inlet valve 6 is arranged obliquely. Although a good tumble effect can be obtained by the structure, the air inlet tends to be downwards inclined, the air inlet channel needs to be closer to a vertical angle than the air inlet channel of the vortex, so that the height of the cylinder cover is increased, and the arrangement of a valve mechanism and the like at the top of the cylinder cover is difficult or influenced due to the high inlet position of the air inlet channel 3 and the obliquely arranged air inlet valve 6.

The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information constitutes prior art already known to a person skilled in the art.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a novel admit air of engine rolls a class structure, its simple structure is reasonable, has improved and has rolled a class effect, and can not lead to the high increase of cylinder head, and then can not arrange the valve timing mechanism at cylinder head top and cause difficulty or influence.

In order to achieve the above object, the utility model provides a novel inflow tumble structure of engine, include: the engine comprises an engine cylinder body, an air inlet channel, an exhaust valve, an inlet 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 inlet channel is arranged on the top of the cylinder body of the engine cylinder. The exhaust passage is arranged on the top of the cylinder body of the engine cylinder, and the exhaust passage and the air inlet passage are symmetrically arranged. The exhaust valve is arranged at the end part of the exhaust passage. The intake valve sets up in the tip of intake duct, and the intake valve is higher than the exhaust valve. And the eccentric counter bore is arranged below the inlet valve.

In an embodiment of the present invention, an eccentric chamfer is provided at an outlet of the eccentric counterbore.

The utility model discloses an among the embodiment, the novel intake tumble structure of engine still includes the (air) intake valve seat circle, sets up on the tip of intake duct.

In an embodiment of the present invention, the intake valve seat ring is located above the eccentric counterbore.

The utility model discloses an in an embodiment, the novel intake tumble structure of engine still includes the exhaust valve seat circle, sets up on the tip of exhaust passage.

In one embodiment of the present invention, the exhaust valve seat ring is lower than the intake valve seat ring.

In one embodiment of the present invention, the top surface of the piston is a flat surface.

In an embodiment of the present invention, the eccentric counterbore is used to allow the intake air to move down along the cylinder wall, thereby forming a tumble flow.

Compared with the prior art, according to the utility model discloses a novel intake tumble structure of engine, simple structure is reasonable, has improved the tumble effect, and can not lead to the high increase of cylinder head, and then can not arrange the valve mechanism at cylinder head top and cause difficulty or influence.

Drawings

Fig. 1 is a front view structural schematic diagram of a conventional intake tumble structure.

Fig. 2 is a schematic structural view of a novel intake tumble structure of an engine according to an embodiment of the present invention.

Description of the main reference numerals:

1-an engine cylinder body, 2-a piston, 3-an air inlet channel, 4-an exhaust channel, 5-an exhaust valve, 6-an air inlet valve, 7-an eccentric counter bore, 8-an eccentric oblique chamfer, 9-an air inlet valve seat ring and 10-an exhaust valve seat ring.

Detailed Description

The following detailed description of the present invention is provided in conjunction with the accompanying drawings, but it should be understood that the scope of the present invention is not limited by the following detailed description.

Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.

Fig. 2 is a schematic structural view of a novel intake tumble structure of an engine according to an embodiment of the present invention. As shown in fig. 2, the novel intake tumble structure of the engine according to the preferred embodiment of the present invention includes: the engine cylinder comprises an engine cylinder body 1, an air inlet channel 3, an exhaust channel 4, an exhaust valve 5, an air inlet valve 6 and an eccentric counterbore 7. A piston 2 is arranged in the engine cylinder body, and the top of the engine cylinder body 1 is a plane. The inlet channel 3 is arranged on top of the engine cylinder block 1. The exhaust passage 4 is arranged on the top of the engine cylinder body 1, and the exhaust passage 4 and the air inlet passage 3 are symmetrically arranged. An exhaust valve 5 is provided at the end of the exhaust passage 4. The intake valve 6 is provided at an end of the intake passage 3, and the intake valve 6 is higher than the exhaust valve 5. And an eccentric counterbore 7 is provided below the intake valve 6.

In an embodiment of the present invention, an eccentric chamfer 8 is provided at an outlet of the eccentric counterbore 7.

The utility model discloses an in an embodiment, the novel intake tumble structure of engine still includes intake valve seat circle 9, sets up on the tip of intake duct 3.

In one embodiment of the present invention, the intake valve seat ring 9 is located above the eccentric counterbore 7.

In an embodiment of the present invention, the novel intake tumble structure of the engine further includes an exhaust valve seat ring 10, which is disposed on the end of the exhaust passage 4.

In one embodiment of the invention, the exhaust valve seat insert 10 is lower than the intake valve seat insert 9.

In one embodiment of the present invention, the top surface of the piston 2 is a flat surface.

In an embodiment of the present invention, the eccentric counterbore 7 is used to allow the intake air to move down along the cylinder wall, thereby forming a tumble flow.

In practical application, the utility model discloses a novel intake tumble structure of engine raises (air) intake valve 6 and (air) intake valve seat circle 9 in the 3 exits of intake duct, simultaneously in (air) intake valve 6 below, processes out an eccentric counter bore 7. When air is fed, the air is guided and shielded by the air inlet valve 6 and the eccentric counterbore 7 below the air inlet valve, so that the air is enabled to move downwards along the cylinder wall, and tumble flow is formed. In addition, an eccentric bevel chamfer 8 can be arranged at the outlet of the eccentric counterbore 7, so that the tumble effect is further enhanced. The ideal tumble effect can be obtained by properly adjusting the eccentric position, the eccentric amount, the eccentric chamfer and the gas distribution phase, and the performance of the engine is improved.

In a word, the utility model discloses a novel tumble flow structure that admits air of engine, simple structure is reasonable, on 3 bases of the intake duct of traditional diesel engine cylinder head, only raises (air) intake valve 6 positions, and 3 total heights of intake duct are unchangeable, and intake valve 6 is still vertical arranging, and the height of cylinder head and valve mechanism can all be unchangeable, can realize the effect of tumble scavenging, are applicable to the engine that adopts tumble to admit air such as gas machine, two-stroke diesel engine. And the structure parameters can be flexibly adjusted, different tumble effects can be obtained, and different performance development requirements can be met.

The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.

Claims

1. A novel intake tumble structure of an engine is characterized by comprising:

the piston-type engine comprises an engine cylinder body, wherein a piston is arranged in the engine cylinder body, and the top of the engine cylinder body is a plane;

the air inlet channel is arranged on the top of the engine cylinder body;

the exhaust passage is arranged on the top of the cylinder body of the engine cylinder, and the exhaust passage and the air inlet passage are symmetrically arranged;

the exhaust valve is arranged at the end part of the exhaust passage;

the intake valve is arranged at the end part of the air inlet channel and is higher than the exhaust valve; and

and the eccentric counter bore is arranged below the inlet valve.

2. The novel intake tumble structure of engine as set forth in claim 1, characterized in that an eccentric chamfer is provided at the outlet of said eccentric counterbore.

3. The novel intake tumble structure of engine as set forth in claim 1, further comprising an intake valve seat ring provided on an end portion of said intake passage.

4. The novel intake tumble flow structure of engine according to claim 3, characterized in that said intake valve seat ring is located above said eccentric counterbore.

5. The novel intake tumble flow structure of engine as set forth in claim 3, further comprising an exhaust valve seat ring provided on an end portion of said exhaust passage.

6. The novel intake tumble flow structure of engine as set forth in claim 5, characterized in that said exhaust valve seat ring is lower than said intake valve seat ring.

7. The novel intake tumble structure of engine as set forth in claim 1, characterized in that the top surface of said piston is flat.

8. The novel intake tumble structure of the engine according to claim 1, characterized in that said eccentric counterbore is used to let the intake air move down the cylinder wall, thereby forming a tumble flow.