CN215595740U

CN215595740U - Engine cylinder cover

Info

Publication number: CN215595740U
Application number: CN202121407714.6U
Authority: CN
Inventors: 何龙龙; 王家武; 陈良
Original assignee: Guangzhou Automobile Group Co Ltd
Current assignee: Guangzhou Automobile Group Co Ltd
Priority date: 2021-06-23
Filing date: 2021-06-23
Publication date: 2022-01-21
Anticipated expiration: 2031-06-23

Abstract

The utility model relates to the technical field of motor vehicle engines, and discloses an engine cylinder cover which comprises a cylinder cover body, wherein a plurality of cylinder inlet channels are arranged on one side of the cylinder cover body, a waste gas recirculation main channel is arranged in the cylinder cover body, one end of the waste gas recirculation main channel is opened and used for introducing waste gas, the other end of the waste gas recirculation main channel is closed, a plurality of waste gas recirculation channel branches which correspond to the cylinder inlet channels one to one are also arranged in the cylinder cover body, and the waste gas recirculation main channel is communicated with the cylinder inlet channels through the waste gas recirculation channel branches. The utility model solves the problem of more uniform distribution of the waste gas introduced into each cylinder of the engine, thereby ensuring the combustion consistency of each cylinder of the engine.

Description

Engine cylinder cover

Technical Field

The utility model relates to the technical field of motor vehicle engines, in particular to an engine cylinder cover.

Background

The cylinder head is an important component of the engine, a valve train and necessary lubricating oil passages of the engine are generally arranged on the cylinder head, and meanwhile, the cylinder head provides mounting supports for other parts, such as an air inlet manifold, a cylinder head cover, an exhaust gas recirculation valve, an exhaust gas recirculation cooler and the like. In general, exhaust gas in an exhaust gas recirculation system is connected to an engine intake manifold through an external connecting pipeline and then distributed to an intake passage of each cylinder of a cylinder head through the intake manifold, but when the exhaust gas is distributed to the intake passage of each cylinder through the intake manifold, the distribution quantity consistency of the exhaust gas of each cylinder is difficult to control, the exhaust gas distribution of each cylinder is uneven, and the combustion consistency of each cylinder of an engine is further influenced.

SUMMERY OF THE UTILITY MODEL

The technical problem to be solved by the utility model is as follows: how to make the distribution of the waste gas introduced into each cylinder of the engine more uniform and further ensure the combustion consistency of each cylinder of the engine.

In order to solve the technical problem, the utility model provides an engine cylinder cover which comprises a cylinder cover body, wherein a plurality of cylinder inlet channels are arranged on one side of the cylinder cover body, a waste gas recirculation main channel is arranged in the cylinder cover body, one end of the waste gas recirculation main channel is opened and used for introducing waste gas, the other end of the waste gas recirculation main channel is closed, a plurality of waste gas recirculation channel branches which correspond to the cylinder inlet channels one to one are further arranged in the cylinder cover body, and the waste gas recirculation main channel is communicated with the cylinder inlet channels through the waste gas recirculation channel branches.

Further, the exhaust gas recirculation main channel penetrates through the cylinder head body, and the opening end of the exhaust gas recirculation main channel is positioned at the rear end of the cylinder head body; the closed end of the exhaust gas recirculation main passage is located at the front end of the cylinder head body.

Furthermore, the closed end of the exhaust gas recirculation main channel is provided with a sealing piece for sealing the closed end, and the sealing piece is a steel ball, a bowl-shaped plug or a bolt plug.

Further, the engine cylinder head further comprises an exhaust gas recirculation valve which is arranged on the cylinder head body and communicated with the opening end of the exhaust gas recirculation main channel.

Further, the exhaust gas recirculation valve and the cylinder head body are both provided with flange surfaces, the exhaust gas recirculation valve is connected with the cylinder head body in a mode of flange surface fitting, and the exhaust gas recirculation valve is fixed with the cylinder head body through fixing bolts.

Further, a sealing ring or a plane flange gasket is arranged between the exhaust gas recirculation valve and the cylinder cover body.

Further, the shell of the exhaust gas recirculation valve and the cylinder cover body are both made of aluminum alloy materials.

Further, the cylinder head body, the cylinder inlet channel, the exhaust gas recirculation main channel and the exhaust gas recirculation channel branch are of an integrally formed structure.

Further, the exhaust gas recirculation main passage is arranged above the cylinder inlet passage.

Furthermore, one end of the exhaust gas recirculation passage branch is connected with the exhaust gas recirculation main passage, and the other end of the exhaust gas recirculation passage branch is connected with the air inlet passage of the air cylinder.

Compared with the prior art, the engine cylinder cover provided by the technical scheme has the beneficial effects that: through with the exhaust gas recirculation main entrance and exhaust gas recirculation passageway branch road integrated to the cylinder head body inside, waste gas directly gets into the cylinder intake duct after exhaust gas recirculation main entrance passes through exhaust gas recirculation passageway branch road, consequently can control the distribution volume of the waste gas of each jar through the machining dimension size of controlling each exhaust gas recirculation passageway branch road, makes the distribution of the waste gas of each cylinder more even, and then guarantees the uniformity of each cylinder burning of engine.

Drawings

FIG. 1 is a schematic block diagram of a prior art cylinder head incorporating an exhaust gas recirculation passage;

FIG. 2 is a schematic block diagram of a cylinder head of an engine according to an embodiment of the present invention;

FIG. 3 is a cross-sectional view of FIG. 2 along section line A-A;

FIG. 4 is a cross-sectional view of FIG. 2 taken along section line B-B;

fig. 5 is a schematic flow direction diagram of the air flow when the engine cylinder head of the embodiment of the utility model is introduced with the exhaust gas, and in the diagram, arrows indicate the flow direction of the air flow.

The device comprises a cylinder cover 1, an air inlet manifold 2, an exhaust gas recirculation outlet pipe 3, an exhaust gas recirculation valve 4, an exhaust gas recirculation cooler 5, a cylinder cover body 10, a cylinder air inlet pipe 11, an exhaust gas recirculation main channel 12, an exhaust gas recirculation channel branch 13, a sealing piece 14, a fixing bolt 15 and a sealing ring 16.

Detailed Description

The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.

In the description of the present invention, it should be understood that the terms "central", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., used herein are used in the orientation or positional relationship indicated in the drawings, which are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

As shown in fig. 1, a conventional cylinder head 1 is provided with an intake manifold 2, an exhaust gas recirculation outlet pipe 3, an exhaust gas recirculation valve 4, an exhaust gas recirculation cooler 5 and other components, gas in the exhaust gas recirculation system is connected to the intake manifold 2 of the engine through the exhaust gas recirculation outlet pipe 3 outside the cylinder head 1, and then is distributed to an intake duct of each cylinder of the cylinder head by the intake manifold 2, the consistency of the exhaust gas distribution amount of each cylinder is difficult to control, the combustion consistency of each cylinder of the engine is affected, the required arrangement space is large, the cost is high, meanwhile, due to the reasons of cost and arrangement, the exhaust gas recirculation valve 4 has no heat preservation or heating device, under the condition of extreme low temperature, condensed water in the exhaust gas recirculation channel is concentrated at the exhaust gas recirculation valve and freezes, so that the exhaust gas recirculation valve 4 is difficult to normally open or close, and the exhaust gas recirculation system and the engine cannot normally operate, thereby affecting the performances of oil consumption, emission and the like of the whole engine.

As shown in fig. 2 to 5, an embodiment of the present invention provides an engine cylinder head, which includes a cylinder head body 10, a plurality of cylinder inlet channels 11 arranged along a front-back direction of the cylinder head body 10 are disposed on one side of the cylinder head body 10, a main exhaust gas recirculation channel 12 extending along the front-back direction of the cylinder head body 10 is disposed inside the cylinder head body 10, one end of the main exhaust gas recirculation channel 12 is open and used for introducing exhaust gas, the other end of the main exhaust gas recirculation channel 12 is closed, a plurality of exhaust gas recirculation channel branches 13 corresponding to the cylinder inlet channels 11 one by one are further disposed inside the cylinder head body 10, and the main exhaust gas recirculation channel 12 is communicated with the cylinder inlet channels 11 through the exhaust gas recirculation channel branches 13.

Based on the above scheme, through integrating inside cylinder head body 10 with exhaust gas recirculation main channel 12 and exhaust gas recirculation channel branch road 13, waste gas directly gets into cylinder intake duct 11 behind exhaust gas recirculation channel branch road 13 from exhaust gas recirculation main channel 12, consequently can control the distribution volume of the waste gas of each jar through the machining dimension size of controlling each exhaust gas recirculation channel branch road 13, makes the distribution of the waste gas of each cylinder more even, and then guarantees the uniformity of each cylinder burning of engine.

Specifically, the exhaust gas recirculation channel branch 13 corresponding to each cylinder air inlet channel 11 is formed by machining, and the diameter of the exhaust gas recirculation channel branch can be optimized according to the performance requirement of the engine through gas flow simulation calculation or an actual test result, so that the circulating exhaust gas distributed to each cylinder is equivalent, and the combustion consistency of each cylinder is good.

In addition, the exhaust gas recirculation main channel 12 and the exhaust gas recirculation channel branch 13 are integrated in the cylinder cover body 10, so that the structure is compact, and the layout space of the engine is reduced; the scheme cancels an external pipeline (the exhaust gas recirculation outlet pipe 3), reduces the leakage risk of multi-flange connection, and prevents the risks of exhaust gas leakage and environmental pollution caused by aging or poor sealing of the external connecting pipeline; the number of connecting and fixing parts is reduced, the process is simple, and the cost is low.

As shown in fig. 2 and 3, the exhaust gas recirculation main passage 12 penetrates the cylinder head body 10, and an open end of the exhaust gas recirculation main passage 12 is located at a rear end of the cylinder head body 10 and receives the gas discharged from the exhaust gas recirculation valve 4; the closed end of the exhaust gas recirculation main passage 12 is located at the front end of the cylinder head body 10. The exhaust gas recirculation main passage 12 penetrates the cylinder head body 10 to facilitate the machining.

Specifically, the cylinder head body 10 is a casting forming piece, the cylinder air inlet 11 and the cylinder head body 10 are cast and formed together, the exhaust gas recirculation main channel 12 and the exhaust gas recirculation channel branch 13 are machined and formed, the cylinder head body 10, the cylinder air inlet 11, the exhaust gas recirculation main channel 12 and the exhaust gas recirculation channel branch 13 are of an integrally formed structure, the machining process is simple, and the occupied space of the engine is reduced.

As shown in fig. 2 and 5, the closed end of the exhaust gas recirculation main channel 12 is provided with a sealing member 14 for sealing the closed end, in this embodiment, the sealing member 14 is a steel ball, specifically, a solid steel ball, and the steel ball is pressed into the exhaust gas recirculation main channel 12 on the cylinder head body 10 by interference, so as to plug the processing hole and form a closed passage.

In other embodiments, the seal 14 may be a bowl plug or bolt plug, which provides the same sealing function as a steel ball.

As shown in fig. 2 to 5, the engine cylinder head of the present embodiment further includes an exhaust gas recirculation valve 4 disposed on the cylinder head body 10 and communicated with an opening end of the exhaust gas recirculation main channel 12, and the exhaust gas enters from an inlet of the exhaust gas recirculation valve 4, passes through the exhaust gas recirculation valve 4, enters the exhaust gas recirculation main channel 12 in the cylinder head body 10, and is guided to flow into the intake duct 11 of each cylinder through the exhaust gas recirculation channel branch 13.

The exhaust gas recirculation valve 4 and the cylinder head body 10 are both provided with flange surfaces, the exhaust gas recirculation valve 4 and the cylinder head body 10 are connected in a flange surface attaching mode, and the exhaust gas recirculation valve 4 and the cylinder head body 10 are fixed through a fixing bolt 15. The mode of flange face laminating can increase area of contact, improves heat conduction speed, has solved under the extreme low temperature condition, and the condensate water in the exhaust gas recirculation passageway freezes, blocks up the passageway or bonds exhaust gas recirculation valve 4's valve, causes exhaust gas recirculation valve 4 to be difficult to normally open or the technical problem who closes.

Specifically, in this embodiment, the egr valve 4 is directly assembled to the cylinder head body 10, and the egr valve 4 is equivalent to the cylinder head body 10 in temperature field, so that even under extreme low temperature conditions, the cylinder head body 10 can also form a heating effect on the egr valve 4, thereby preventing the condensed water in the egr passage from freezing to affect the normal operation of the egr system.

Further, as shown in fig. 3, a seal ring 16 is provided between the exhaust gas recirculation valve 4 and the cylinder head body 10, and specifically, the seal ring 16 is a rubber O-ring 16 for reinforcing the seal of the connection between the opening end of the exhaust gas recirculation main passage 12 and the exhaust gas recirculation valve 4. In other embodiments, a flat flange gasket may be used instead of the sealing ring 16 to achieve the same effect.

Wherein, the shell of exhaust gas recirculation valve 4 and cylinder head body 10 all adopt aluminum alloy material to make, and aluminum alloy material's heat conductivity is good, and cylinder head body 10 is heated fast under the engine operation condition, and exhaust gas recirculation valve 4 is also heated correspondingly in time, has avoided under extreme low temperature condition that the condensate water in the exhaust gas recirculation passageway freezes, blocks up the route or bonds the valve, avoids exhaust gas recirculation valve 4 to open the difficulty or can't open the condition, reduces engine fault.

As shown in fig. 2 to 5, the exhaust gas recirculation main passage 12 is disposed above the cylinder inlet 11 and arranged in the front and rear end directions of the cylinder head body 10, so that the machining process is simple and the layout is reasonable.

As shown in fig. 4 and 5, one end of the exhaust gas recirculation passage branch 13 is connected to the exhaust gas recirculation main passage 12, and the other end of the exhaust gas recirculation passage branch 13 is connected to the cylinder inlet 11, so that the exhaust gas recirculation passage branch 13 is short in length and easy to machine, and the uniformity of the exhaust gas distributed to each cylinder can be adjusted by controlling the machining aperture.

It should be noted that, as shown in fig. 2 to fig. 5, the engine cylinder head of the present embodiment is a four-cylinder engine, that is, the engine cylinder head has four cylinder intake ports 11 and four exhaust gas recirculation passage branches 13, but the engine cylinder head of the present invention may also be applied to engines with other number of cylinders, and the number of the cylinder intake ports 11 and the number of the exhaust gas recirculation passage branches 13 may be adjusted accordingly.

In summary, according to the cylinder head of the engine provided by the embodiment of the present invention, the exhaust gas recirculation main channel 12 and the exhaust gas recirculation channel branch 13 are integrated inside the cylinder head body 10, and the exhaust gas recirculation channel branch 13 directly connects to the intake port 11 of each cylinder, and the exhaust gas distribution amount of each cylinder is controlled by the aperture size of the exhaust gas recirculation channel branch 13 of each cylinder on the cylinder head body 10, so that the exhaust gas distribution of each cylinder is more uniform.

In addition, the exhaust gas recirculation valve 4 of the engine cylinder head is directly assembled on the cylinder head body 10, the air outlet of the exhaust gas recirculation valve 4 is communicated with the exhaust gas recirculation main channel 12 on the cylinder head body 10, so that the exhaust gas recirculation valve 4 is directly contacted with the cylinder head body 10, heat is conducted to the exhaust gas recirculation valve 4 through the cylinder head body 10, and the problem that the valve is difficult to open or is frozen and adhered due to freezing of the exhaust gas recirculation valve 4 under the extremely low temperature condition is avoided.

Compared with the prior art, the cylinder cover of the engine cancels an external exhaust gas recirculation pipeline, an installation sealing structure of the cylinder cover and an intake manifold and the like, reduces the overall dimension of the engine, and reduces the connection cost and the external leakage risk.

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides an engine cylinder head, its characterized in that, includes the cylinder head body, one side of cylinder head body is equipped with a plurality of cylinder intake duct, the inside of cylinder head body is equipped with exhaust gas recirculation main entrance, exhaust gas recirculation main entrance's one end opening is used for letting in waste gas, exhaust gas recirculation main entrance's the other end is sealed, the inside of cylinder head body still be equipped with a plurality of with the exhaust gas recirculation passageway branch road of cylinder intake duct one-to-one, exhaust gas recirculation main entrance passes through exhaust gas recirculation passageway branch road with the cylinder intake duct is linked together.

2. The engine cylinder head according to claim 1, characterized in that the exhaust gas recirculation main passage extends through the cylinder head body, an open end of the exhaust gas recirculation main passage being located at a rear end of the cylinder head body; the closed end of the exhaust gas recirculation main passage is located at the front end of the cylinder head body.

3. The engine cylinder head according to claim 2, wherein the closed end of the exhaust gas recirculation main passage is provided with a sealing member for sealing the closed end, the sealing member being a steel ball, a bowl plug, or a bolt plug.

4. The engine cylinder head according to claim 1, further comprising an exhaust gas recirculation valve provided on the cylinder head body and communicating with an open end of the exhaust gas recirculation main passage.

5. The engine cylinder head according to claim 4, wherein the exhaust gas recirculation valve and the cylinder head body are provided with flange surfaces, the exhaust gas recirculation valve and the cylinder head body are connected by means of flange surface fitting, and the exhaust gas recirculation valve and the cylinder head body are fixed by fixing bolts.

6. The engine cylinder head according to claim 5, wherein a sealing ring or a flat flange gasket is provided between the exhaust gas recirculation valve and the cylinder head body.

7. The engine cylinder head according to claim 5, wherein the housing of the exhaust gas recirculation valve and the cylinder head body are both made of an aluminum alloy material.

8. The engine cylinder head according to any one of claims 1 to 7, characterized in that the cylinder head body, the cylinder intake port, the exhaust gas recirculation main passage, and the exhaust gas recirculation passage branch are of an integrally formed structure.

9. The engine cylinder head according to any one of claims 1 to 7, characterized in that the exhaust gas recirculation main passage is provided above the cylinder intake passage.

10. The engine cylinder head according to any one of claims 1 to 7, characterized in that one end of the exhaust gas recirculation passage branch is connected to the exhaust gas recirculation main passage, and the other end of the exhaust gas recirculation passage branch is connected to the cylinder intake passage.