CN202531300U

CN202531300U - Direct injection piston top structure

Info

Publication number: CN202531300U
Application number: CN2012201530374U
Authority: CN
Inventors: 胡景彦; 洪进
Original assignee: NINGBO YINZHOU DELIGHT TECHNOLOGY CO LTD
Current assignee: NINGBO YINZHOU DELIGHT TECHNOLOGY CO LTD
Priority date: 2012-04-12
Filing date: 2012-04-12
Publication date: 2012-11-14
Anticipated expiration: 2022-04-12

Abstract

The utility model discloses a direct injection piston top structure. The direct injection piston top structure comprises a piston top surface (1) and a groove (2) which is formed on the piston top surface (1), wherein a bottom surface of the groove (2) is a plane. Because the bottom surface of the groove is the plane, compression ratio which is formed is less than 10, so the self radiation area of a piston top is relatively increased, thermal stress is difficult to concentrate, and under the conditions that the compression ratio is further improved and thermal load is increased, the piston top is difficult to erode, and thermal fatigue failure is avoided; and fuel wall wetting cannot be caused by the plane, a risk on engine oil dilution is reduced, the thermal efficiency of an engine can be improved, the economical performance of the engine is improved, and the thermal fatigue risk of the piston top is reduced.

Description

In-cylinder direct injection piston head structure

Technical field

The utility model relates to a kind of piston, particularly relates to a kind of in-cylinder direct injection piston head structure.

Background technique

At present; Along with closing on of fuel economy regulation execution date phase III; Each company is all at the exploitation direct spray petrol engine in cylinder both at home and abroad; Wherein the piston head structure Design is very big for engine combustion efficiency and air-flow fuel oil sense of organization coherence, and the piston head structure also has very big influence to piston heat fatigue simultaneously; So the piston head structural design is mainly considered two aspects: first air-flow and fuel oil mixed performance; The piston head structure will match with the air flue air-flow; Let fuel oil better entrainmented by air-flow; Form more rational mixed gas mixture ratio of fuel to oil example and distribute, the piston head structure will cooperate secondary fuel injection simultaneously, lets the wet wall of oil spout reach minimumization; Second aspect is when directly jetting gasoline engine cylinder temperature heat load promotes, and piston head satisfies the thermal stress requirement, and reasonably the piston head structure can reduce thermal fatigue, improves safety coefficient.

The piston head structure of existing technology all compares point, and the bottom surface of end face upper groove is cambered surface, and the compression ratio of formation is all bigger; Generally all more than 11; So just make the heat diffusion area of piston head own relatively also diminish, thermal stress is also concentrated easily simultaneously, and further improves under the aggravation heat load condition at compression ratio; This piston head causes the piston ablation easily and suffers the situation that thermal fatigue is destroyed; Moreover this piston head structure causes the fuel oil wall that wets easily, increases the risk of oil dilution, even the situation that piston is scrapped occurs.

The model utility content

The utility model to above problem provide that a kind of heat diffusion area is relatively large, thermal stress is difficult for concentrating, be not prone to the ablation situation and be not prone to the in-cylinder direct injection piston head structure of the wet wall situation of fuel oil.

The utility model overcomes the above problems used technological scheme: a kind of in-cylinder direct injection piston head structure with following structure is provided, and it comprises piston-top surface and is arranged on the groove on the piston-top surface that the bottom surface of described groove is the plane.

After adopting above structure, compared with prior art, the utility model is because the bottom surface of groove is the plane; The compression ratio that then forms is all less relatively, generally all below 10, so just makes the heat diffusion area of piston head own relatively also increase; Thermal stress is also concentrated with regard to being difficult for simultaneously, and further improves and aggravate under the condition of heat load at compression ratio, and piston head is not prone to the situation that piston is ablated and suffered thermal fatigue destruction; Moreover the plane is difficult for causing the fuel oil wall that wets, and reduces the risk of oil dilution, helps further improving the thermal efficiency of motor; And the Economy of raising motor, and the thermal fatigue risk of piston head reduces.Therefore the utlity model has that heat diffusion area is relatively large, thermal stress is difficult for concentrating, be not prone to the ablation situation and be not prone to the characteristics of the wet wall situation of fuel oil.

As improvement; The bottom surface of described groove is the triangle structure; And three the sideline on limit is camber line, and then the groove of this structure makes the heat diffusion area of piston head own relatively further increase, and thermal stress also just more is difficult for concentrating; The utility model reduces the risk of wet wall of fuel oil and oil dilution simultaneously, so can make the thermal efficiency of motor and the Economy of motor further improve.

As further improvement, have two limits to be symmetrically distributed in described three limits, and three limits are round-corner transition each other; Between two limits of described symmetrical distribution farthest be 31.45mm apart from a, the perpendicular distance b between three limits of the transition position to the on two limits of described symmetrical distribution is 35.34mm; Be provided with the transitional surface of arc between the bottom surface of described groove and the piston-top surface, the radius of a circle that described transitional surface is corresponding is 6mm; The bottom surface of described groove is 6.37mm to the distance between the piston-top surface highest point; Make the shape of groove more be applicable to motor, help fuel oil and mix, improve combustion efficiency, and can adopt the common designations fuel oil, further improve the Economy of motor, thereby save user cost with the air-flow assembling.

Description of drawings

Fig. 1 is the structural representation of the utility model in-cylinder direct injection piston head structure.

Fig. 2 is the plan view of the utility model in-cylinder direct injection piston head structure.

Fig. 3 is the sectional view along A-A line among Fig. 2.

As shown in the figure: 1, piston-top surface, 2, groove, 2.1, first sideline, 2.2, second sideline, the 2.3, the 3rd sideline, 3, transitional surface.

Embodiment

Below in conjunction with accompanying drawing and embodiment, the utility model done further describing.

Like Fig. 1, Fig. 2 and a kind of in-cylinder direct injection piston head structure shown in Figure 3, it comprises piston-top surface 1 and is arranged on the groove 2 on the piston-top surface 1 that the bottom surface of described groove 2 is the plane.

The bottom surface of described groove 2 is the triangle structure; And three the sideline on limit is camber line; Article three, the limit is respectively first sideline 2.1, second sideline 2.2 and the 3rd sideline 2.3; The bottom surface that is to say groove 2 is made up of first sideline 2.1, second sideline 2.2 and the 3rd sideline 2.3, and first sideline 2.1, second sideline 2.2 and the 3rd sideline 2.3 are camber line.

Have two limits to be symmetrically distributed in described three limits, and three limits be round-corner transition each other, i.e. first sideline 2.1 and 2.2 symmetrical distributions of second sideline, first sideline 2.1, second sideline 2.2 and the 3rd sideline 2.3 are mutual to be round-corner transition.

Between two limits of described symmetrical distribution farthest be 31.45mm apart from a; Be 31.45mm apart from a between first sideline 2.1 and the 3rd sideline 2.3 connecting ends and second sideline 2.2 and the 3rd sideline 2.3 connecting ends promptly; Perpendicular distance b between three limits of the transition position to the on two limits of described symmetrical distribution is 35.34mm, and promptly the perpendicular distance b between the joint in first sideline 2.1 and second sideline 2.2 and the 3rd sideline 2.3 is 35.34mm.

Be provided with the transitional surface 3 of arc between the bottom surface of described groove 2 and the piston-top surface 1; Described transitional surface 3 corresponding radius of a circles are 6mm, also can be regarded as first sideline 2.1, second sideline 2.2 and the 3rd sideline 2.3 and all carry out the transition to piston-top surface 1 through transitional surface 3.

The bottom surface of described groove 2 is 6.37mm to the distance between piston-top surface 1 highest point.

Above embodiment is merely the preferred embodiment of the utility model, and the utility model is not limited only to above embodiment and also allows other structural change, allly in the utility model rights to independence claimed range, changes, and all belongs to the utility model protection domain.

Claims

1. in-cylinder direct injection piston head structure, it comprises piston-top surface (1) and is arranged on the groove (2) on the piston-top surface (1) that it is characterized in that: the bottom surface of described groove (2) is the plane.

2. in-cylinder direct injection piston head structure according to claim 1 is characterized in that: the bottom surface of described groove (2) is the triangle structure, and the sideline on three limits is camber line.

3. in-cylinder direct injection piston head structure according to claim 2 is characterized in that: have two limits to be symmetrically distributed in described three limits, and three limits are round-corner transition each other.

4. in-cylinder direct injection piston head structure according to claim 3; It is characterized in that: between two limits of described symmetrical distribution farthest be 31.45mm apart from a, the perpendicular distance b between three limits of the transition position to the on two limits of described symmetrical distribution is 35.34mm.

5. in-cylinder direct injection piston head structure according to claim 1 is characterized in that: be provided with the transitional surface (3) of arc between the bottom surface of described groove (2) and the piston-top surface (1), the radius of a circle that described transitional surface (3) is corresponding is 6mm.

6. in-cylinder direct injection piston head structure according to claim 1 is characterized in that: the bottom surface of described groove (2) is 6.37mm to the distance between piston-top surface (1) highest point.