CN217270506U

CN217270506U - Diesel engine cylinder

Info

Publication number: CN217270506U
Application number: CN202221627020.8U
Authority: CN
Inventors: 蔡志勇; 李武鹏; 李万里; 周鹏
Original assignee: Weichai Power Co Ltd
Current assignee: Weichai Power Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-08-23
Anticipated expiration: 2032-06-28

Abstract

The utility model relates to a diesel engine technical field, more specifically says, relates to a diesel engine cylinder, and this diesel engine cylinder includes cylinder liner, cylinder cap and sets up the piston in the cylinder liner, and cylinder cap, piston and cylinder liner enclose to close and form the combustion chamber, and the bottom of cylinder cap is provided with supplementary lug, and supplementary lug is used for filling the burning blind spot at combustion chamber top to ensure that the air in the combustion chamber can with fuel intensive mixing, make the burning more abundant, with the dynamic nature that improves the diesel engine and reduce harmful substance's emission. The utility model provides an auxiliary bump includes first lug portion, and first lug portion forms the toper region around the axis of sprayer mounting hole. The tapered region provides a guide for fuel injected by the injector to ensure that the fuel is dispersed into the combustion chamber. The auxiliary projection further includes a second projection portion having a guide surface which has an effect of guiding gas in the combustion chamber from an edge portion to a middle portion of the combustion chamber, so that the heat load of the cylinder liner can be reduced.

Description

Diesel engine cylinder

Technical Field

The utility model relates to a diesel engine technical field, more specifically say, relate to a diesel engine cylinder.

Background

For diesel engines, the purpose of the combustion chamber is to organize the reasonable gas movement, thereby providing a place and space for the mixing and combustion of the combustible gases. The combustion chamber is enclosed by the top of the piston, the bottom of the cylinder cover and the cylinder sleeve. The cylinder cover is provided with an oil sprayer which is used for spraying fuel oil into the combustion chamber. A large number of numerical simulation and experimental researches show that only a small part of fuel can enter a region close to the bottom of a cylinder cover, and the region is a combustion dead zone. In the combustion dead zone, air cannot be fully utilized, so that the thermal efficiency of the diesel engine is reduced, and the combustion economy is reduced.

SUMMERY OF THE UTILITY MODEL

The utility model aims at making the air in the combustion chamber fully utilized to improve the dynamic property of the diesel engine and reduce the emission of harmful substances. In order to achieve the above purpose, the utility model provides a following technical scheme:

the utility model provides a diesel engine cylinder, includes cylinder liner, cylinder cap and sets up piston in the cylinder liner, the cylinder cap the piston and the cylinder liner encloses to close and forms the combustion chamber, the bottom of cylinder cap is provided with supplementary lug, supplementary lug is used for filling the burning blind spot at combustion chamber top.

Preferably, a fuel injector mounting hole is formed in the cylinder cover, the auxiliary protruding block is arranged around the fuel injector mounting hole, and the auxiliary protruding block and the fuel injector mounting hole are coaxially arranged.

Preferably, the auxiliary projection includes a first projection portion forming a tapered region around an axis of the injector mounting hole, the tapered region guiding fuel injected from the injector.

Preferably, the auxiliary protruding block further includes a second protruding block portion, the second protruding block portion is disposed on a side of the first protruding block portion away from the injector mounting hole, the second protruding block portion has a guide surface, one side of the guide surface is connected to a bottom of a tapered surface of the tapered region, the other side of the guide surface extends in a direction away from the injector mounting hole and is finally connected to a bottom of the cylinder head, and the guide surface gradually descends from an edge portion of the cylinder head to the first protruding block portion.

Preferably, the guide surface is an arc surface which is concave upwards, and the arc surface is in smooth transition connection with the bottom of the conical surface through an arc surface.

Preferably, the first projection portion and the second projection portion are integrally molded as the auxiliary projection.

Preferably, the top of the piston is provided with a cavity for forming the combustion chamber, and the bottom of the cavity is provided with a first bulge protruding upwards and used for filling a combustion dead zone at the bottom of the combustion chamber.

Preferably, the side wall of the cavity is provided with a second protruding portion, and the second protruding portion is used for enabling the combustible gas to form turbulent flow.

Preferably, the cylinder cover is provided with an air inlet hole and an air outlet hole, a part of the air inlet hole penetrates through the auxiliary projection, and a part of the air outlet hole penetrates through the auxiliary projection.

It can be seen from the above technical solution that: the utility model discloses set up supplementary lug in the bottom of cylinder cap, this supplementary lug is used for filling the burning blind spot at combustion chamber top to ensure that the air in the combustion chamber can with the fuel intensive mixing, make the burning more abundant, with the dynamic nature that improves the diesel engine and reduce harmful substance's emission.

The utility model provides an auxiliary convex block includes first lug portion, and the characteristic of this first lug portion lies in that first lug portion forms the toper region around the axis of sprayer mounting hole. The conical area has a guiding effect on fuel sprayed by the fuel injector to ensure that the fuel is dispersed into the combustion chamber, so that the uniform mixing of the fuel and air is facilitated, and the combustion efficiency is improved. The auxiliary lug further includes a second lug portion having a guide surface which has a function of guiding gas in the combustion chamber from an edge portion to a middle portion of the combustion chamber, so that a heat load of the cylinder liner can be reduced.

Drawings

In order to illustrate the embodiments of the present invention more clearly, the drawings used in the description of the embodiments will be briefly described, it is obvious that the drawings in the description below are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained without inventive work.

Fig. 1 is a cross-sectional view of a cylinder of a diesel engine according to an embodiment of the present invention;

FIG. 2 is an enlarged view taken at A in FIG. 1;

fig. 3 is a top view of a cylinder head according to an embodiment of the present invention.

Wherein, 1 is a cylinder cover, 2 is a piston, 21 is a first lug, 22 is a second lug, 3 is a fuel injector mounting hole, 4 is an auxiliary lug, 41 is a first lug, 42 is a second lug, 411 is a conical surface, 412 is a conical area, 421 is a guide surface, 5 is an air inlet, and 6 is an air outlet.

Detailed Description

The utility model discloses a diesel engine cylinder, this diesel engine cylinder can make the air obtain make full use of to improve the dynamic property of diesel engine and reduce harmful substance's emission.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "upper", "lower", "top", "bottom", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element 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.

The utility model discloses a diesel engine cylinder, this diesel engine cylinder include cylinder liner, cylinder cap 1 and set up piston 2 in the cylinder liner. The cylinder cover 1, the piston 2 and the cylinder sleeve enclose to form a combustion chamber. The applicant has found that in the combustion chamber enclosed by the cylinder head 1, the piston 2 and the cylinder liner, there is a combustion dead zone in the region close to the cylinder head 1, or in the region of the top of the combustion chamber. Only a small portion of the fuel injected from the injector into the combustion chamber can reach the combustion dead space at the top, and therefore air is not fully utilized in the combustion dead space, resulting in insufficient fuel combustion.

Therefore, the utility model discloses set up supplementary lug 4 in the bottom of cylinder cap 1, this supplementary lug 4 is used for filling the burning blind spot at combustion chamber top to ensure that the air in the combustion chamber can with the fuel intensive mixing, make the burning more abundant, with the dynamic nature that improves the diesel engine and reduce harmful substance's emission.

The utility model discloses be provided with sprayer mounting hole 3 on well cylinder cap 1, the supplementary lug 4 of 1 bottom of cylinder cap sets up around sprayer mounting hole 3, and supplementary lug 4 and 3 coaxial settings of sprayer mounting hole. Because the combustion dead zone of cylinder cap 1 bottom is for the axis symmetrical arrangement about sprayer mounting hole 3, consequently set up supplementary lug 4 and sprayer mounting hole 3 coaxial arrangement and can ensure supplementary lug 4 and the combustion dead zone phase-match at combustion chamber top to do benefit to supplementary lug 4 and effectively fill the combustion dead zone.

The utility model provides an auxiliary bump 4 includes first bump portion 41, and the characterized in that of this first bump portion 41 lies in that first bump portion 41 forms cone region 412 around the axis of sprayer mounting hole 3, and the aperture end of this cone region 412 communicates with each other with the combustion chamber with the spout switch-on of sprayer, cone region 412's big footpath end. The tapered region 412 provides a guide for the fuel from the fuel injector to ensure that the fuel is dispersed into the combustion chamber, thereby facilitating even mixing of the fuel with air and improving combustion efficiency.

The auxiliary projection 4 includes a second projection portion 42 in addition to the first projection portion 41, and the second projection portion 42 is provided on a side of the first projection portion 41 away from the injector mounting hole 3. The second projection 42 is circumferentially provided around the axis of the injector mounting hole 3. The second projection 42 is characterized in that the second projection 42 has a guide surface 421. The guide surface 421 has one side connected to the bottom of the tapered surface 411 of the tapered region 412 and the other side extending away from the injector mounting hole 3 and eventually connected to the bottom of the cylinder head 1. And, the guide surface 421 gradually descends from a connection portion where the guide surface 421 is connected to the bottom of the cylinder head 1 to a connection portion where the guide surface 421 is connected to the tapered surface 411.

Since the guide surface 421 is a surface gradually descending, the guide surface 421 has a function of guiding the gas in the combustion chamber, and has a function of guiding the gas in the combustion chamber from the edge portion to the middle portion of the combustion chamber, so that the thermal load on the bottom portion of the cylinder head 1 and the liner can be reduced.

Further, the guiding surface 421 is an arc surface concave upwards, and is configured to be smoothly connected with the tapered surface 411 of the tapered region 412 through an arc surface. Thus, the auxiliary bump 4 forms a smooth surface inside the combustion chamber, and avoids sharp dead angles, thereby avoiding thermal stress concentration.

The first bump portion 41 and the second bump portion 42 are integrally molded as the auxiliary bump 4. Further, the auxiliary projection 4 is integrally molded with the cylinder head 1.

The utility model discloses in, the top of piston 2 has the cavity, and this cavity has formed the combustion chamber with cylinder cap 1, cylinder liner. The bottom of the cavity is provided with a first boss 21 protruding upward, and the first boss 21 is used for filling a combustion dead zone at the bottom of the combustion chamber. Thus, the air in the combustion chamber is further fully utilized, and the combustion efficiency is improved.

The utility model discloses still set up second bellying 22 on the lateral wall of cavity, second bellying 22 protrusion in the lateral wall of cavity, combustible gas in the combustion chamber can form the vortex after bumping and touching second bellying 22, so just so do benefit to the intensive mixing of fuel and air.

The utility model discloses set up intercommunication combustion chamber and external inlet port 5 on cylinder cap 1 to and intercommunication combustion chamber and external exhaust hole 6. The inlet 5 and outlet 6 ports are located close to the injector mounting hole 3 or close to the centre of the combustion chamber. A portion of the air intake hole 5 penetrates the auxiliary protrusion 4, and a portion of the air discharge hole 6 penetrates the auxiliary protrusion 4.

Finally, it should be further noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diesel engine cylinder comprises a cylinder sleeve, a cylinder cover and a piston arranged in the cylinder sleeve, wherein the cylinder cover, the piston and the cylinder sleeve enclose to form a combustion chamber;

the cylinder cover is provided with an oil sprayer mounting hole, the auxiliary lug is arranged around the oil sprayer mounting hole, and the auxiliary lug and the oil sprayer mounting hole are coaxially arranged;

the auxiliary lug comprises a first lug part, and a tapered area is formed by the first lug part around the axis of the fuel injector mounting hole and guides fuel sprayed by the fuel injector.

2. The diesel cylinder as claimed in claim 1, wherein the auxiliary protrusion further includes a second protrusion portion provided on a side of the first protrusion portion away from the injector mounting hole, the second protrusion portion having a guide surface, one side of the guide surface being connected to a bottom of the tapered surface of the tapered region, and the other side thereof extending away from the injector mounting hole and finally being connected to a bottom of the cylinder head, the guide surface gradually descending from an edge portion of the cylinder head to the first protrusion portion.

3. The diesel engine cylinder of claim 2, wherein the guide surface is an arc surface which is concave upwards, and the arc surface is connected with the bottom of the conical surface through a circular arc surface in a smooth transition manner.

4. The diesel cylinder of claim 2, wherein the first tab portion and the second tab portion are integrally molded as the auxiliary tab.

5. The cylinder of claim 1, wherein the top of the piston has a cavity for forming the combustion chamber, and the bottom of the cavity is provided with a first protrusion protruding upward for filling a dead zone of combustion at the bottom of the combustion chamber.

6. The diesel cylinder of claim 5, wherein the side wall of the cavity is provided with a second protrusion for disturbing the combustible gas.

7. The diesel cylinder as set forth in claim 1, wherein said cylinder head is provided with an intake hole and an exhaust hole, a portion of said intake hole penetrates said auxiliary projection, and a portion of said exhaust hole penetrates said auxiliary projection.