CN201635825U

CN201635825U - Novel 'four-heart-valve' diesel engine combustion chamber

Info

Publication number: CN201635825U
Application number: CN2010201334007U
Authority: CN
Inventors: 刘永峰; 秦建军; 田洪森; 仇滔
Original assignee: Beijing University of Civil Engineering and Architecture
Current assignee: Beijing University of Civil Engineering and Architecture
Priority date: 2010-03-17
Filing date: 2010-03-17
Publication date: 2010-11-17
Anticipated expiration: 2020-03-17

Abstract

The utility model provides a piston for improving the compression ratio of an internal combustion engine; a combustion chamber on the top (3) of the piston comprises a pit (4), a first concave platform (5) and a second concave platform (6), wherein the first concave platform (5) and the second concave platform (6) are arranged on the upper edge of the pit (4); the outline area and depth of the pit (4) are respectively far smaller than those of the first concave platform (5) and the second concave platform (6); and a small offset distance is left between the axis of the pit (4) and the axis of the piston body so as to well ensuring the operation stability of the piston. The design of the utility model improves the shape of the combustion chamber, increases the size of the combustion chamber so as to increase the compression ratio and well improve the dynamic performance of the internal combustion engine, and in addition, can adapt to the use needs of different types of diesel engines through the angles, height (depth) between of the concave platforms, the axis of the pit and other sizes.

Description

A kind of novel " four heart lobes " diesel engine firing chamber

Affiliated technical field

The utility model relates to the diesel motor piston structure.

Background technique

Diesel motor piston is made up of piston head, piston crown and piston skirt.Piston head be the important component part that forms the firing chamber, generally can be divided into flat head piston according to its shape, shallow hole type and dell type piston three major types, if the upper surface of piston is provided with the shape of piston pit of concave crown and the burning that the position helps inflammable mixture, the combustion performance of internal-combustion engine will be improved greatly, at the fuel oil that sprays at a high speed under high pressure, by the particular concave structure of piston head in cylinder and the turbulent flow that forms together of air, and and air move to top of combustion chamber together, near cylinder cap, form mixture strength zone uniformly, the concentration of mixed gas and temperature are enough to guarantee that mixed gas catches fire herein, under the effect of turbulent flow, what flame was also very fast is diffused into the lower zone of concentration from the higher zone of mixture strength.Utilize this process, higher compression ratio and powerful turbulent flow just make thin mixed gas fully burn in cylinder, have improved combustion efficiency, reach the consumption of having saved fuel oil when increasing power again.

Summary of the invention

The technical problems to be solved in the utility model is: on the base of design of existing concave head piston, in the Position Design of pit mouth four outward extending step cutting patterns, increase the volume of partial combustion chamber thus, reach the purpose that improves combustion engine powered performance with this.

Piston skirt and piston crown and traditional diesel engine piston are similar, the piston head combuster, and the firing chamber is made up of pit, first concave station and second concave station; The profile line at the top of pit, first concave station and second concave station is linked to be an integral body, and wherein on the basis of traditional concave head piston, the oral area in hole has been designed four circular concave stations and pit and intersected, and non-intersect between first concave station and second concave station;

The center line of pit and the center line of piston body have an offset or dish, it is not steady to have guaranteed that piston can not cause owing to weight is unbalanced in running, first concave station and second concave station are each other along the axis arranged of pit at an angle, the firing chamber of piston head, height (deeply) degree of first concave station and second concave station is less than height (deeply) degree of pit.

The beneficial effects of the utility model are, can improve on the basis of combustion in IC engine performance well at original concave head piston, can further improve the shape of firing chamber, increased the volume of firing chamber, thereby on the basis that does not change the whole internal-combustion engine structure, can improve the power performance of internal-combustion engine well, can also adapt to the use needs of dissimilar internal-combustion engines in addition by the central axis equidimension of the angle between the concave station, height (deeply) degree and pit.

Description of drawings

Below in conjunction with drawings and Examples the utility model is further specified.

Fig. 1 is the utility model plan view;

Fig. 2 is a plan view of the present utility model;

Fig. 3 is a left view of the present utility model;

1. piston skirts among the figure, 2. piston crown, 3. piston head, 4. pit, 5. first concave station, 6. second concave station.

Embodiment

Below in conjunction with accompanying drawing the utility model is described in further detail:

In Fig. 2, internal combustion engine is made up of piston head 3, piston crown 2 and piston skirt 1, wherein piston skirt 1 and piston crown 2 are similar with traditional internal combustion engine, the external diameter of piston head is 186 millimeters, piston head 3 combusters, first concave station 5 becomes 90 degree along the axis arranged of pit 4 each other with second concave station 6; Height (deeply) degree of first concave station 5 and second concave station 6 is 2.1 millimeters, and the highest (deeply) degree of ω type pit 4 is 37 millimeters.

In Fig. 1, the firing chamber is made up of ω type pit 4, first concave station 5 and second concave station 6, first concave station, 5 diameters are 41.5 millimeters, the diameter of second concave station 6 is 47.5 millimeters, the external diameter of ω type pit 4 is 122 millimeters, and the distance at the center of first concave station 5 and second concave station 6 and ω type pit 4 centers is 80 millimeters; The profile line at the top of pit 4, first concave station 5 and second concave station 6 is linked to be an integral body, wherein first concave station 5 and second concave station 6 respectively with the roof intersection of pit 4, and non-intersect between first concave station 5 and second concave station 6; The central horizontal offset or dish of the center of pit 4 and piston body is 8 millimeters, and the vertical off setting distance is 2 millimeters.

Claims

1. novel " four heart lobes " diesel engine firing chamber, mainly form by piston head (3), piston crown (2) and piston skirt (1), wherein piston skirt (1) and piston crown (2) are similar with traditional internal combustion engine, piston head (3) combuster is characterized in that: the firing chamber is made up of pit (4), first concave station (5) and second concave station (6); The profile line at the top of pit (4), first concave station (5) and second concave station (6) is linked to be an integral body, wherein first concave station (5) and second concave station (6) respectively and the roof intersection of pit (4), and non-intersect between first concave station (5) and second concave station (6).

2. the firing chamber of described piston head according to claim 1 (3), the center line of pit (4) and the center line of piston body have an offset or dish.

3. the firing chamber of described piston head according to claim 1 (3), first concave station (5) and second concave station (6) are each other along the axis arranged of pit (4) at an angle.

4. the firing chamber of described piston head according to claim 1 (3), height (deeply) degree of first concave station (5) and second concave station (6) is less than height (deeply) degree of pit (4).