CN215804866U

CN215804866U - Gasoline engine EGR system

Info

Publication number: CN215804866U
Application number: CN202121933330.8U
Authority: CN
Inventors: 尤涛; 岳开国
Original assignee: Wuxi Wolfe Autoparts Co ltd; Kunming Yunnei Power Co Ltd
Current assignee: Wuxi Wolfe Autoparts Co ltd; Kunming Yunnei Power Co Ltd
Priority date: 2021-08-18
Filing date: 2021-08-18
Publication date: 2022-02-11
Anticipated expiration: 2031-08-18

Abstract

The utility model relates to a gasoline engine EGR system, which belongs to the technical field of gasoline engines and comprises a cylinder cover (1), an EGR valve (2) and an EGR outlet pipe (3); the EGR valve (2) is sealed and fixed with the cylinder cover (1) through an EGR valve seat (4); an EGR air passage A (5) and an EGR air passage B (6) are arranged in a water jacket of the cylinder cover (1); the cylinder cover (1) is also provided with an air passage groove (8) communicated with the cylinder cover exhaust passage (7); the air passage groove (8), the EGR air passage A (5), the EGR air passage B (6) and an air inlet passage of the EGR valve (2) are communicated in sequence; an inlet of the EGR gas outlet pipe (3) is communicated with a gas outlet channel of the EGR valve (2), and an outlet of the EGR gas outlet pipe (3) is communicated to the side of an inlet (9) of a throttle valve of the intake manifold; the utility model can improve the cooling efficiency of the EGR gas and solve the problem of uneven distribution of the EGR gas in each cylinder.

Description

Gasoline engine EGR system

Technical Field

The utility model belongs to the technical field of gasoline engines, and particularly relates to an EGR (exhaust gas recirculation) system of a gasoline engine.

Background

With the increasing prominence of global environmental pollution and energy shortage pressure problems, countries have set up increasingly strict emission regulations and oil consumption regulations in succession. To cope with the pressure of emission and fuel consumption regulations, EGR technology is increasingly being used on modern engines.

In the use process of the EGR technology, in order to obtain better oil consumption and emission effect, EGR cooler parts are used for reducing the temperature of EGR gas, so that the cost pressure of parts brought by the popularization of the technology is increased; meanwhile, when EGR gas is introduced into an engine intake manifold, the condition of uneven distribution of EGR gas in each cylinder often occurs, the combustion stability of the engine during working is influenced, and the performance of the engine is reduced.

Disclosure of Invention

In order to overcome the problems in the prior art, the utility model provides an EGR system of a gasoline engine, which can improve the cooling efficiency of EGR gas and solve the problem of uneven distribution of the EGR gas in each cylinder.

In order to realize the purpose, the utility model is realized by the following technical scheme:

the gasoline engine EGR system comprises a cylinder cover, an EGR valve and an EGR outlet pipe; the EGR valve is sealed and fixed with the cylinder cover through an EGR valve seat; an EGR air passage A and an EGR air passage B are arranged in the water jacket of the cylinder cover; the cylinder cover is also provided with an air passage groove communicated with the cylinder cover exhaust passage; the air passage groove is communicated with an air passage of an EGR air passage A, EGR air passage B, EGR valve in sequence; and the inlet of the EGR gas outlet pipe is communicated with the gas outlet channel of the EGR valve, and the outlet of the EGR gas outlet pipe is communicated to the inlet or the side of the throttle valve of the gas inlet manifold.

Preferably, the EGR air passage A is arranged close to the water outlet of the cylinder cover.

Preferably, the EGR outlet pipe is a metal corrugated pipe.

The utility model has the beneficial effects that:

according to the utility model, the air passage of the EGR gas is embedded into the cylinder cover cooling water jacket and is arranged close to the water outlet of the cylinder cover, so that the EGR gas is cooled by utilizing the cooling water in the cylinder cover and the higher water flow speed of the water outlet of the cylinder cover. Meanwhile, the EGR outlet pipe is made of a metal corrugated pipe, the pipe body is long and thin, the pipe wall is thin, the heat exchange between the EGR gas in the pipe and the external air is facilitated to dissipate the heat, the two measures are implemented simultaneously, the EGR cooler parts required by a conventional EGR system can be reduced, and the system cost is reduced.

The EGR gas is introduced into the intake manifold through the EGR gas outlet pipe and is close to the inlet of the throttle valve of the intake manifold, so that the EGR gas can be fully mixed with fresh air, and the phenomenon of uneven distribution of the EGR gas in each cylinder is solved.

Drawings

FIG. 1 is a front view of the present invention;

FIG. 2 is a left side view of the present invention;

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

FIG. 4 is an intake manifold throttle inlet facing view of the present invention;

in the figure, 1-cylinder cover, 2-EGR valve, 3-EGR outlet pipe, 4-EGR valve seat, 5-EGR air passage A, 6-EGR air passage B, 7-cylinder cover exhaust passage, 8-air passage groove, 9-inlet manifold throttle inlet, 10-cylinder cover water outlet, 11-sealing pad and 12-inlet manifold.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings to facilitate understanding of the skilled person.

As shown in fig. 1-3, the EGR system of the gasoline engine comprises a cylinder head 1, an EGR valve 2 and an EGR outlet pipe 3. The EGR valve 2 is sealed and fixed to the cylinder head 1 by an EGR valve seat 4, and a seal gasket 11 is provided on a sealing surface between the EGR valve seat 4 and the cylinder head 1.

An EGR air passage A5 and an EGR air passage B6 are embedded in a water jacket of the cylinder head 1, and the EGR air passage A5 is arranged close to a cylinder head water outlet 10. After the EGR air passage A5 is arranged close to the cylinder cover water outlet 10, the cooling water flows rapidly and is at low temperature, and the cooling water and the gas in the EGR air passage A5 indirectly exchange heat to cool the EGR gas.

The cylinder cover 1 is provided with an air passage groove 8 communicated with the cylinder cover exhaust passage 7; the air passage groove 8, the EGR air passage A5, the EGR air passage B6 and the air inlet passage of the EGR valve 2 are communicated in sequence. The inlet of the EGR outlet pipe 3 is communicated with the outlet channel of the EGR valve 2, and the outlet of the EGR outlet pipe 3 is communicated to the side of the inlet 9 of the air intake manifold throttle valve.

Waste gas in the cylinder cover exhaust passage 7 sequentially enters the inlet 9 of the intake manifold throttle valve through the air passage groove 8, the EGR air passage A5, the EGR air passage B6, the EGR valve 2 and the EGR air outlet pipe 3, and is fully mixed and dispersed with cooling air in the intake manifold throttle valve, so that the problem of uneven distribution of EGR gas in each cylinder is solved.

As a preferred technical scheme, the EGR outlet pipe 3 is a metal corrugated pipe, the pipe body is slender, the pipe wall is thin, and the heat exchange between the EGR gas in the pipe and the external air is convenient for heat dissipation.

The inventor proves through a large number of experiments that the following two measures are implemented simultaneously: (1) an EGR air passage A5 and an EGR air passage B6 are embedded in a water jacket of the cylinder head 1, and the EGR air passage A5 is arranged close to a water outlet 10 of the cylinder head; (2) the EGR outlet pipe 3 is made of the metal corrugated pipe, so that EGR cooler parts required by a conventional EGR system can be omitted, and the system cost is reduced.

Finally, it is noted that the above-mentioned preferred embodiments illustrate rather than limit the utility model, and that, although the utility model has been described in detail with reference to the above-mentioned preferred embodiments, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the scope of the utility model as defined by the appended claims.

Claims

1. A gasoline engine EGR system is characterized in that: comprises a cylinder cover (1), an EGR valve (2) and an EGR outlet pipe (3); the EGR valve (2) is sealed and fixed with the cylinder cover (1) through an EGR valve seat (4); an EGR air passage A (5) and an EGR air passage B (6) are arranged in a water jacket of the cylinder cover (1); the cylinder cover (1) is also provided with an air passage groove (8) communicated with the cylinder cover exhaust passage (7); the air passage groove (8), the EGR air passage A (5), the EGR air passage B (6) and an air inlet passage of the EGR valve (2) are communicated in sequence; and the inlet of the EGR outlet pipe (3) is communicated with the outlet channel of the EGR valve (2), and the outlet of the EGR outlet pipe (3) is communicated to the side of the inlet (9) of the air intake manifold throttle valve.

2. The EGR system for a gasoline engine as defined in claim 1, wherein: the EGR air passage A (5) is arranged close to the water outlet (10) of the cylinder cover.

3. The EGR system for a gasoline engine according to claim 1 or 2, wherein: the EGR gas outlet pipe (3) is a metal corrugated pipe.