CN106014676A

CN106014676A - Piston of engine

Info

Publication number: CN106014676A
Application number: CN201610630987.4A
Authority: CN
Inventors: 邓远海
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 2016-08-04
Filing date: 2016-08-04
Publication date: 2016-10-12

Abstract

The invention discloses a piston of an engine. A combustion chamber is formed in the head of the piston; at least one bulge is formed on the top surface of the piston, and between the top surface edge of the combustion chamber and the outer edge on the top surface of the piston. As the structure of the top surface of the piston is optimized, when the structure of an air inlet passage and the oil-air mixing effect are kept unchanged, the squeezing and disturbing intensity of air flow in a cylinder and near the compression top dead center can be improved, the tubulence energy of air in the cylinder is increased, flame propagation speeds in the ignition delay period and the main combustion period are improved, and the duration of combustion is shortened. Therefore, the thermal efficiency and the performance of the engine are improved, and the emission of unburned hydrocarbons is reduced; moreover, the structure optimization method can adapt to pistons and combustion chambers of different structural forms.

Description

The piston of electromotor

Technical field

The present invention relates to engine art, particularly to the piston of a kind of electromotor.

Background technology

Along with the Abgasgesetz increasingly stringent to unburned hydrocarbons emission limit, and Fuel Consumption Become the emphasis that industry is paid close attention to, reduce the discharge of electromotor unburned hydrocarbons and Fuel Consumption is the heaviest Want, this target can be realized by the way of optimizing electromotor in-cylinder combustion at present.Piston is that electromotor is the heaviest One of burning parts wanted, its version affects the flow distribution of air-flow in engine cylinder, thus shadow Ring engine combustion.By piston combustion chamber shape, structure are optimized design, can reasonably group Knit In Cylinder Flow, improve the average tubulence energy of air-flow, improve rate of flame propagation, increase burning speed Rate, improves engine performance.

Electromotor realizes the motion of air-flow in cylinder by the coupling of air intake duct and piston combustion chamber structure.Cylinder The liquid form of interior air-flow is eddy current and squeezes stream, at engine induction stroke and compression initial stage, air-flow in cylinder Liquid form be eddy current, upon compression in phase cylinder the liquid form of air-flow be eddy current and squeeze stream, Qi Zhong It is the strongest that compression top center squeezes stream.Eddy current is formed by helical intake, forms turbulent flow in compression process, along with work The upper shifting eddy current of plug gradually dissipates；Crowded stream is clamp-oned piston combustion indoor by air-flow and is formed, and along combustor Wall forms inverse squeezing and flows, and forms turbulent flow.Therefore tubulence energy intensity is relevant with eddy current and crowded intensity of flow.? In the case of inlet structure is constant, optimization piston chamber structure can be passed through, improve compression top center The crowded intensity of flow of neighbouring gas in the jar, increases gas disturbance, increases the tubulence energy of gas in the jar, improves fire The propagation rate of flame, thus improve the thermal efficiency of electromotor, improve engine performance and reduce unburned hydrocarbon Compound emission.

As Figure 1-3, the head of piston is provided with combustor 2, piston to the piston of the electromotor of prior art End face 1 be to squeeze stream in plane, therefore delay period and main combustion period to be quickly converted to turbulent flow, gas in cylinder The Turbulent Kinetic of stream is little, and flame transmission speed is slow, so that engine thermal efficiency reduces, is unfavorable for sending out The performance of motivation, improves QI consumed and unburned hydrocarbons discharge.

The information being disclosed in this background section is merely intended to increase the reason of the general background to the present invention Solve, and be not construed as recognizing or imply in any form that this information structure is for this area general technology Prior art well known to personnel.

Summary of the invention

It is an object of the invention to provide the piston of a kind of electromotor, thus in overcoming existing engine cylinder The Turbulent Kinetic of air-flow is little, and flame transmission speed is slow, QI consumed and high the lacking of unburned hydrocarbons discharge Point.

For achieving the above object, the invention provides the piston of a kind of electromotor, the head of piston is provided with combustion Burn room, on the end face of piston, be provided with at least between top edge and the outward flange of piston-top surface of combustor One projection.

Preferably, in technique scheme, between top edge and the outward flange of piston-top surface of combustor Being provided with the convex sets that at least two is radially arranged, each convex sets circumferentially arranges.

Preferably, in technique scheme, convex sets is an annular projection.

Preferably, in technique scheme, convex sets includes the spaced projection of at least two.

Preferably, in technique scheme, protruding cross section is rectangle, square, circle or many Limit shape.

Preferably, in technique scheme, between top edge and the outward flange of piston-top surface of combustor It is provided with a convex sets circumferentially arranged.

Preferably, in technique scheme, convex sets is an annular projection.

Compared with prior art, there is advantages that

The application structure by optimization piston end face, is keeping inlet structure constant and air-fuel mixture effect Improve the crowded stream of air-flow, strength of turbulence near cylinder in the case of the most constant, increase The tubulence energy of gas in the jar, improves flame transmission speed in delay period and main combustion period, shortens combustion The duration burnt, thus improve the thermal efficiency of electromotor, improve engine performance, and reduce not Combustion hydrocarbon emission；Further, this structure optimization mode be applicable to different structure form piston and Combustor.

Accompanying drawing explanation

Fig. 1 is the front view of the piston of prior art.

Fig. 2 is the top view of the piston of prior art.

Fig. 3 is the axonometric chart of the piston of prior art.

Fig. 4 is the front view of the piston according to the present invention.

Fig. 5 is the top view of the piston according to the present invention.

Fig. 6 is the three-dimensional cutaway view of the piston according to the present invention.

Fig. 7 is the axonometric chart of the piston according to the present invention.

Fig. 8 is the comparison diagram of average tubulence energy in the air-flow of cylinder in prior art and the application.

Fig. 9 is the graph of a relation of tubulence energy and flame propagation velocity.

Main Reference Numerals illustrates:

1-piston-top surface, 2-combustor, 3-is protruding.

Detailed description of the invention

Below in conjunction with the accompanying drawings, the detailed description of the invention of the present invention is described in detail, it is to be understood that this The protection domain of invention is not limited by detailed description of the invention.

Explicitly indicate that unless otherwise other, otherwise in entire disclosure and claims, term " bag Include " or its conversion as " comprising " or " including " etc. will be understood to comprise stated element or Ingredient, and do not get rid of other element or other ingredient.

As shown in figs. 4-7, it is provided with combustor 2 according to the head of the piston of the specific embodiment of the invention, lives On plug end face 1, between top edge and the outward flange of piston-top surface 1 of combustor 2, it is provided with at least one Projection, between protruding inward flange and the top edge of combustor and the outward flange of projection with end face outside A certain distance it is respectively provided with between edge.

As an embodiment, projection can be with piston integrally casting or be welded on piston-top surface.

Embodiment 1

It is provided with one between top edge and the outward flange of piston-top surface 1 of combustor 2 circumferentially to arrange Convex sets.

As an embodiment, as shown in figs. 4-7, this convex sets is an annular projection 3, and this is ring-type convex Playing 3 can be concentric with combustor 2, it is also possible to eccentric relative to combustor 2.In this embodiment, ring The cross section of shape projection 3 can be regular shape, as being rectangle, square, circular or polygon etc., Can also be irregularly shaped.This annular projection 3 can closer to the top edge of combustor or closer to The outward flange of piston-top surface 1.

As another embodiment, this convex sets includes the spaced projection of at least two, such as, is somebody's turn to do Convex sets can be uniformly distributed in combustor 2 around, forms an annulus, and this annulus can be with combustion Burn room 2 concentric, it is also possible to eccentric relative to combustor 2.In this embodiment, protruding cross section can To be regular shape, as being rectangle, square, circular or polygon etc., it is also possible to be irregular shape Shape.

Embodiment 2

It is provided with at least two between top edge and the outward flange of piston-top surface 1 of combustor 2 radially to arrange The convex sets of row, each convex sets circumferentially arranges.

As an embodiment, it is provided with between top edge and the outward flange of piston-top surface 1 of combustor 2 At least two annular projection, this annular projection can be concentric with combustor 2, it is also possible to relative to combustor 2 Eccentric.In this embodiment, the cross section of annular projection can be regular shape, as being rectangle, just Square, circular or polygon etc., it is also possible to be irregularly shaped.

As another embodiment, each convex sets can include the projection that at least two circumferentially arranges, For example, it is possible to be uniformly distributed in combustor 2 around, forming an annulus, this annulus can be with combustion Burn room 2 concentric, it is also possible to eccentric relative to combustor 2.The circumferential position of the respective bump in two groups can With identical or mutually stagger.In this embodiment, the cross section of each projection can be regular shape, as Be rectangle, square, circular or polygon etc., it is also possible to be irregularly shaped.

As another embodiment, often the projection in group can be arranged in combustor 2 around unevenly.

Fig. 8 is the comparison diagram of the average tubulence energy of air-flow (in cylinder in cylinder in prior art and the application Flowing result of calculation).As can be seen from Figure 7, processing bulge-structure on the end face 1 of piston can be to a certain degree The average tubulence energy of air-flow in upper raising cylinder.Fig. 9 is the graph of a relation of tubulence energy and flame propagation velocity, turbulence Can be the biggest, flame propagation velocity is the fastest.Therefore, the end face 1 of piston is processed bulge-structure can carry High flame transmission speed.

The aforementioned description to the specific illustrative embodiment of the present invention illustrates that and the purpose of illustration. These descriptions are not wishing to limit the invention to disclosed precise forms, and it will be apparent that according to above-mentioned Teaching, can much change and change.The purpose selected exemplary embodiment and describe exists In explaining the certain principles of the present invention and actual application thereof, so that those skilled in the art can be real Now and utilize the various different exemplary of the present invention and various different selection and change. The scope of the present invention is intended to be limited by claims and equivalents thereof.

Claims

1. a piston for electromotor, the head of described piston is provided with combustor, it is characterised in that described On the end face of piston, between top edge and the outward flange of piston-top surface of described combustor, it is provided with at least one Individual projection.

The piston of electromotor the most according to claim 1, it is characterised in that the top of described combustor The convex sets that at least two is radially arranged it is provided with, often between the outward flange of edge, face and described piston-top surface Individual convex sets circumferentially arranges.

The piston of electromotor the most according to claim 2, it is characterised in that described convex sets is one Individual annular projection.

The piston of electromotor the most according to claim 2, it is characterised in that described convex sets includes The spaced projection of at least two.

5. according to the piston of the electromotor described in claim 3 or 4, it is characterised in that described projection Cross section is rectangle, square, circular or polygon.

The piston of electromotor the most according to claim 1, it is characterised in that the top of described combustor A convex sets circumferentially arranged it is provided with between the outward flange of edge, face and described piston-top surface.

The piston of electromotor the most according to claim 6, it is characterised in that described convex sets is one Individual annular projection.

The piston of electromotor the most according to claim 6, it is characterised in that described convex sets includes The spaced projection of at least two.

9. according to the piston of the electromotor described in claim 7 or 8, it is characterised in that described projection Cross section is rectangle, square, circular or polygon.