阅读说明：本技术 发动机进气系统 (Engine air intake system ) 是由 陈伟国 王伟 金晖 李玉琦 于 2019-09-26 设计创作，主要内容包括：本发明公开了一种发动机进气系统,所述发动机进气系统包括进气歧管和气缸盖,所述进气歧管包括内插气道及进气歧管本体,所述内插气道的第一端与所述进气歧管本体的出气口连通,所述内插气道的第二端密封插装在所述气缸盖的进气道内,所述内插气道的材料为导热系数低的材料,所述进气歧管本体固定在所述气缸盖的外壁上。本发明中通过使用导热系数低的内插气道作为发动机气缸盖进气道的一部分,由于内插气道的导热系数低,这样便可降低发动机气缸盖进气道对气体的加热效应,进而提升发动机容积效率。(The invention discloses an engine air inlet system which comprises an air inlet manifold and an air inlet manifold body, wherein the air inlet manifold comprises an inserted air passage and an air inlet manifold body, the first end of the inserted air passage is communicated with an air outlet of the air inlet manifold body, the second end of the inserted air passage is inserted into an air inlet passage of the air inlet manifold body in a sealing mode, the inserted air passage is made of a material with a low heat conductivity coefficient, and the air inlet manifold body is fixed on the outer wall of the air inlet manifold body. According to the invention, the inserted air passage with low heat conductivity coefficient is used as a part of the air inlet passage of the engine cylinder head, and the heat conductivity coefficient of the inserted air passage is low, so that the heating effect of the air inlet passage of the engine cylinder head on gas can be reduced, and the volumetric efficiency of the engine is further improved.)

1. An engine air inlet system comprises an air inlet manifold (1) and an air cylinder cover (2), and is characterized in that the air inlet manifold comprises an inserted air passage (11) and an air inlet manifold body, a first end of the inserted air passage (11) is communicated with an air outlet of the air inlet manifold body, a second end of the inserted air passage (11) is inserted into an air inlet passage (21) of the air cylinder cover (2) in a sealing mode, the inserted air passage (11) is made of a material with a low heat conduction coefficient, and the air inlet manifold body is fixed on the outer wall of the air cylinder cover (2).

2. The engine intake system according to claim 1, characterized in that the interposed air duct includes an interposed tube (111) and a seal (112), a first end of the interposed tube (111) communicates with the outlet port of the intake manifold body, a second end of the interposed tube (111) is sealingly inserted into the intake passage of the cylinder head (2), the seal (112) is fitted over an outer wall of the interposed tube (111) near the second end, and the seal (112) is interposed between the interposed tube (111) and the intake passage (21) of the cylinder head.

3. The engine air intake system of claim 2, characterized in that the inner insert tube (111) is provided with a groove (1111) on an outer wall thereof, and the seal (112) is installed in the groove (1111).

4. The engine intake system according to claim 2, characterized in that an inner insertion hole (22) is provided in the cylinder head (2) on a side close to the intake manifold, the inner insertion hole (22) communicates with the intake port (21) of the cylinder head, and an outer diameter of the inner insertion hole (22) is larger than an outer diameter of the intake port (21) of the cylinder head, and a second end of the inner insertion tube (111) is inserted into the inner insertion hole (22).

5. The engine air intake system according to claim 4, characterized in that a positioning hole (1112) is provided in a position on the outer wall of the inner insert tube (111) near the second end, and a positioning member (1113) is mounted on the positioning hole (1112), and the positioning member (1113) is used for positioning the inner insert tube (111) in the inner insert hole (22).

6. The engine air intake system of claim 5, characterized in that the locating hole (1112) is a threaded hole, the locating member (1113) is a pin, and the locating member (1113) is threadedly mounted in the locating hole (1112).

7. The engine air intake system of claim 4, characterized in that the inner insert (111) is a clearance fit with the cylinder head inner insert bore (22).

8. The engine intake system of claim 4, wherein an outer diameter of the inner insert hole (22) at an end thereof close to the intake manifold body is larger than an outer diameter of the inner insert hole (22) at an end thereof remote from the intake manifold body.

9. The engine intake system according to any one of claims 1 to 7, characterized in that the first end of the inner gas duct (11) has a larger outer diameter than the second end of the inner gas duct (11).

10. The engine air intake system according to any one of claims 1 to 7, characterized in that the interposed air duct (11) is injection molded of plastic.

Technical Field

The invention belongs to the technical field of engines, and particularly relates to an engine air inlet system.

Background

With the increasingly strict fuel consumption and emission regulations in China, the improvement of the output performance of the engine becomes the key point of research of various automobile manufacturers, and among various means for improving the output performance of the engine, the improvement of the volumetric efficiency of the engine is one of the most important means. Generally, one of the most important factors affecting the volumetric efficiency of the engine is the temperature of the gas at the intake valve of the cylinder. Generally, the higher the gas temperature at the intake valve and the lower the gas density, the lower the mass flow of gas into the cylinder and the less the amount of oxygen entering the cylinder.

Disclosure of Invention

The embodiment of the invention provides an engine air inlet system which can reduce the influence of high temperature at an air inlet channel of an engine cylinder cover on the volumetric efficiency of an engine. The technical scheme is as follows:

the embodiment of the invention provides an engine air inlet system which comprises an air inlet manifold and an air inlet manifold body, wherein the air inlet manifold comprises an inserted air passage and an air inlet manifold body, the first end of the inserted air passage is communicated with an air outlet of the air inlet manifold body, the second end of the inserted air passage is inserted into an air inlet passage of the air inlet manifold body in a sealing mode, the inserted air passage is made of a material with a low heat conductivity coefficient, and the air inlet manifold body is fixed on the outer wall of the air inlet manifold body.

In one embodiment of the present invention, the air duct includes an inner duct and a seal, a first end of the inner duct communicates with the air outlet of the intake manifold body, a second end of the inner duct is sealingly inserted into the intake port of the cylinder head, the seal is fitted to an outer wall of the inner duct near the second end, and the seal is interposed between the inner duct and the intake port of the cylinder head.

In yet another embodiment of the present invention, the outer wall of the inner insert tube is provided with a groove, and the sealing member is mounted in the groove.

In still another implementation manner of the present invention, an inner insertion hole is provided at a side of the cylinder head close to the intake manifold, the inner insertion hole is communicated with the intake passage of the cylinder head, an outer diameter of the inner insertion hole is larger than an outer diameter of the intake passage of the cylinder head, and a second end of the inner insertion tube is inserted into the inner insertion hole.

In yet another embodiment of the present invention, a positioning hole is formed on the outer wall of the inner insert tube near the second end, and a positioning member is mounted on the positioning hole and used for positioning the inner insert tube in the inner insert hole.

In another implementation manner of the present invention, the positioning hole is a threaded hole, the positioning element is a pin, and the positioning element is threadedly mounted in the positioning hole.

In yet another embodiment of the present invention, the inner insert tube is a clearance fit with the inner insert hole of the cylinder head.

In still another mode of carrying out the present invention, an outer diameter of an end of the inner insert hole close to the intake manifold body is larger than an outer diameter of an end of the inner insert hole remote from the intake manifold body.

In yet another implementation of the present invention, the first end of the internal gas passageway has an outer diameter that is greater than an outer diameter of the second end of the internal gas passageway.

In another implementation manner of the present invention, the inner air duct is formed by plastic injection molding.

The technical scheme provided by the embodiment of the invention has the following beneficial effects:

when the engine air inlet system provided by the embodiment of the invention is used, the inserted air channel is directly inserted into the air inlet channel of the cylinder cover, so that air directly enters the cylinder from the inserted air channel. And because the inserted air channel is made of a material with low heat conductivity coefficient, the temperature of the inner wall of the inserted air channel is far lower than the temperature of an air inlet channel of the engine cylinder cover, so that the temperature of the air rises slowly when the air flows through the inserted air inlet channel, the heating effect of the air inlet channel of the cylinder cover on the air is greatly reduced, and the volumetric efficiency of the engine is further improved. Especially when the engine is running at low speed, the flow speed of the gas is slow, and the gas is heated by the air inlet passage of the cylinder head for a long time. The air inlet channel with the inserted air passage can effectively reduce the heating of the air inlet channel of the air cylinder cover to the air, so that the initial temperature of the air entering the air cylinder is low, the temperature of working medium at the moment of compressing a top dead center in the air cylinder is reduced, and the knocking tendency of the engine at a low speed is also reduced.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.

FIG. 1 is a schematic illustration of an engine air intake system provided by an embodiment of the present invention;

FIG. 2 is an enlarged view of an internal insert tube in an intake system of an engine provided by an embodiment of the present invention;

FIG. 3 is an enlarged view of an intake air passage of the engine provided by an embodiment of the present invention.

The symbols in the drawings represent the following meanings:

1. an intake manifold; 11. interpolating an airway; 111. inserting a tube; 1111. a groove; 112. a seal member; 1112. positioning holes; 1113. a positioning member;

2. a cylinder head; 21. an air inlet channel; 22. an inner inserting hole;

3. a spark plug hole; 4. valve guide rod hole.

Detailed Description

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

An intake system of an engine according to an embodiment of the present invention is shown in fig. 1, and the intake system of the engine includes an intake manifold 1 and a cylinder head 2, where the intake manifold 1 includes an inserted air duct 11 and an intake manifold body (not shown), a first end of the inserted air duct 11 is communicated with an air outlet of the intake manifold body, a second end of the inserted air duct 11 is hermetically inserted into an air inlet duct 21 of the cylinder head 2 of the engine, the inserted air duct 11 is made of a material with a low thermal conductivity, and the intake manifold body is fixed on an outer wall of the cylinder head.

When the engine air inlet system provided by the embodiment of the invention is used, firstly, the inserted air passage of the inserted air inlet manifold is inserted into the air inlet passage of the engine cylinder head, then the air inlet manifold body of the inserted air inlet manifold is fixed on the flange surface of the engine cylinder head, and the air correspondingly enters the inserted air passage and the air inlet passage of the engine cylinder head after being divided by the air inlet manifold body. Because the inserted air passage is directly inserted in the air inlet passage of the cylinder cover, air directly enters the cylinder through the inserted air passage, and because the inserted air passage is made of a material with low heat conductivity coefficient, the temperature of the inner wall of the inserted air passage is far lower than the temperature of the air inlet passage of the cylinder cover of the engine, so that the temperature of the air rises slowly when the air flows through the inserted air passage, the heating effect of the air inlet passage of the cylinder cover on the air is greatly reduced, and the volumetric efficiency of the engine is further improved. Especially when the engine is running at low speed, the flow speed of the gas is slow, and the gas is heated by the air inlet passage of the cylinder head for a long time. The air inlet channel with the inserted air passage can effectively reduce the heating of the air inlet channel of the air cylinder cover to the air, so that the initial temperature of the air entering the air cylinder is low, the temperature of working medium at the moment of compressing a top dead center in the air cylinder is reduced, and the knocking tendency of the engine at a low speed is also reduced.

Illustratively, as shown in fig. 1, the cylinder head 2 in the present embodiment further includes a plug hole 3 and a valve guide hole 4, the plug hole 3 is disposed in the middle of the cylinder head 2, the plug hole 3 is used for installing a plug, the valve guide hole 4 is disposed at a position deviated from the middle of the cylinder head 2, the valve guide hole 4 is used for installing a valve guide, an intake passage 21 of the cylinder head 2 is disposed on the side of the valve guide hole 4, and an outlet end of the intake passage 21 of the cylinder head 2 communicates with the valve guide hole 4.

Optionally, the inserted air duct 11 is made of plastic, which is high temperature resistant plastic.

In the above implementation, the cylinder head 2 is generally made of metal, the inner wall of the intake duct 21 of the cylinder head 2 is also made of metal, and the inserted air duct 11 is made of high-temperature-resistant plastic, because the heat conductivity coefficient of the high-temperature-resistant plastic is only 1/500-1/600 of metal, the heating effect of the intake duct 21 of the cylinder head 2 on gas can be greatly reduced, and the volumetric efficiency of the engine is further improved.

Optionally, the outer diameter of the first end of the insertion air passage 11 is larger than the outer diameter of the second end of the insertion air passage 11.

In the above implementation manner, the outer diameter of the first end of the inserted air passage 11 is larger than the outer diameter of the second end of the inserted air passage 11, so that the first end of the inserted air passage 11 is connected with the air outlet of the intake manifold body, and the second end of the inserted air passage 11 is inserted into the intake passage 21 of the cylinder head 2, on the other hand, the inserted tube 111 is matched with the intake passage 21 of the cylinder head 2, so that the air can smoothly pass through the inlet 21 of the cylinder head 2, and further the intake flow is increased.

With continued reference to fig. 1, optionally, the inserted air duct 11 includes an inserted tube 111 and a sealing member 112, a first end of the inserted tube 111 is communicated with the air outlet of the intake manifold body, a second end of the inserted tube 111 is inserted into the intake duct 21 of the cylinder head 2 in a sealing manner, the sealing member 112 is fitted on an outer wall of the inserted tube 111 near the second end, and the sealing member 112 is interposed between the inserted tube 111 and the intake duct 21 of the cylinder head.

In the above implementation manner, the arrangement of the inner insertion tube 111 can simply and conveniently realize the insertion fit between the inner insertion air passage 11 and the air inlet passage 21 of the cylinder head 2, and the insertion manner between the inner insertion tube 111 and the air inlet passage 21 of the cylinder head 2 ensures good fit between the air inlet manifold and the air inlet passage 21 of the cylinder head 2, and meanwhile, the heating effect of the air inlet passage 21 of the cylinder head 2 on the air in the related art can be reduced by arranging the inner insertion tube with low heat conductivity coefficient, so that the volumetric efficiency of the engine is improved. The sealing element 112 can ensure good sealing between the inner insert tube 111 and the air inlet channel 21 of the cylinder head 2, and ensure that gas leakage does not occur when the gas in the engine cylinder passes through the joint between the inner insert tube 111 and the air inlet channel 21 of the cylinder head 2.

Referring again to fig. 1, optionally, inner insert 111 is a radiused bend.

In the above implementation, the inner insert tube 111 is a circular arc bent tube, which facilitates the smooth gas entering the air inlet channel 21 of the cylinder head 2 from the air outlet of the intake manifold body, and prevents the gas from staying in the air inlet channel 21 of the cylinder head 2 and affecting the volumetric efficiency of the engine.

Illustratively, in this embodiment, the inner insert tube 111 is a high temperature resistant plastic tube, the outer wall of the inner insert tube 111 near the second end is provided with a sealing member 112, and the sealing member 112 and the intake port 21 of the cylinder head 2 are in interference fit, so as to ensure that the inner insert tube 111 and the intake port 21 of the cylinder head 2 are in close contact, and have good air tightness and no gas leakage.

Illustratively, the inner insert tube 111 has a circular cross-section, and the sealing member 112 may be an O-ring, which may simply and conveniently seal the inner insert tube 111 with the intake port 21 of the cylinder head 2, thereby ensuring good air tightness therebetween.

Fig. 2 is an enlarged view of an inner insert tube in an engine intake system according to an embodiment of the present invention, and in conjunction with fig. 2, optionally, a groove 1111 is formed on an outer wall of the inner insert tube 111 near a second end thereof, and a sealing member 112 is installed in the groove 1111.

In the above implementation, the groove 1111 is disposed to ensure that the sealing member 112 is firmly fixed on the outer wall of the inner insert tube 111, so that the sealing member 112 is not displaced or dropped due to some accident, and the air tightness between the inner insert tube 111 and the intake port 21 of the cylinder head 2 is good without air leakage.

Alternatively, an inner insertion hole 22 is provided at a side of the cylinder head 2 close to the intake manifold, the inner insertion hole 22 communicates with the intake passage 21 of the cylinder head 2, and an outer diameter of the inner insertion hole 22 is larger than an outer diameter of the intake passage 21 of the cylinder head 2, a second end of the inner insertion tube 111 is inserted into the inner insertion hole 22, and the inner insertion tube 111 communicates with the intake passage 21 of the cylinder head 2.

In the above implementation, the inner insertion hole 22 is provided to facilitate a good assembly between the cylinder head 2 and the inner insertion tube 111, ensure a positional accuracy between the second end of the inner insertion tube 111 and the intake passage 21 of the cylinder head 2, reduce a loss of gas along the way into the cylinder of the engine, and further improve the volumetric efficiency of the engine.

Alternatively, the inner insert tube 111 is provided with a positioning hole 1112 on the outer wall near the second end thereof, and a positioning member 1113 is mounted on the positioning hole 1112, and the positioning member 1113 positions the inner insert tube 111 on the inner insert hole 22 of the cylinder head 2.

In the above implementation, the positioning holes 1112 and the positioning members 1113 are provided to facilitate the secure fitting of the inner insert 111 to the inner insert bore 22 of the cylinder head 2, avoiding disengagement thereof due to unpredictable factors during use.

Alternatively, the positioning hole 1112 is a bolt hole, the positioning member 1113 is a pin, and the positioning member 1113 is screwed into the positioning hole 1112.

In the above implementation, the inner insert tube 111 can be simply and conveniently fixed in the inner insert hole 22 through the matching between the bolt hole and the pin, and the fixed assembly of the inner insert tube 111 and the air inlet passage 21 of the cylinder head 2 is ensured.

Fig. 3 is an enlarged view of an engine intake air duct provided by an embodiment of the present invention, and optionally, the inner duct 111 is in clearance fit with the engine inner plug 22.

In the above embodiment, a certain gap is ensured between the inner insert tube 111 and the inner insert hole 22 without direct contact, so that the arrangement can effectively insulate the air in the inner insert tube 111 from the intake passage 21 of the cylinder head 2, and the air can serve as a natural heat insulating layer because the heat capacity of the air is small, thereby preventing the high temperature in the cylinder head of the engine from being rapidly transmitted to the inner insert tube 111.

Optionally, the outer diameter of the end of the inner insert 22 proximate the intake manifold body is greater than the outer diameter of the end of the inner insert 22 distal the intake manifold body.

In the above implementation manner, the outer diameter of the inner insertion hole 22 near the end of the intake manifold body is larger than the outer diameter of the end of the inner insertion hole far from the intake manifold body, so that smooth passage of gas at the inlet of the intake passage 21 of the cylinder head 2 can be ensured, further, the intake flow is improved, and further, the volumetric efficiency of the engine is prevented from being affected due to the fact that the gas cannot smoothly enter the intake passage 21 of the cylinder head 2.

The operation of the engine intake system provided by the embodiment of the invention is described as follows:

when gas enters an engine cylinder after passing through the intake manifold body, the gas firstly passes through an internal air inserting passage of the intake manifold, then passes through an air inlet passage of an engine cylinder cover, and then passes through an air inlet valve to enter the cylinder of the engine; because the inserted air passage of the air inlet manifold is made of a material with low heat conductivity coefficient, the temperature of the inner wall of the inserted air passage is far lower than the temperature in the air inlet passage of the engine cylinder cover, so that the temperature of the air rises slowly when the air flows through the inserted air passage, the heating effect of the air inlet passage of the engine cylinder cover on the air in the related technology is greatly reduced, and the volumetric efficiency of the engine is further improved.

The present invention is not limited to the above preferred embodiments, and any modifications, equivalent replacements, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention.