CN2742164Y

CN2742164Y - Piston having improved skirt structure

Info

Publication number: CN2742164Y
Application number: CNU2004201051233U
Authority: CN
Inventors: 邓伟; 卿辉斌
Original assignee: Changan Automobile Group Co Ltd
Current assignee: Chongqing Changan Automobile Co Ltd
Priority date: 2004-11-13
Filing date: 2004-11-13
Publication date: 2005-11-23
Anticipated expiration: 2014-11-13

Abstract

The utility model relates to a piston with an improved skirt structure, which comprises a piston head and a piston skirt, the bottom of which is designed to shrink inwards. Thus, the bottom of the piston skirt is avoided scraping the edge of the bottom of a cylinder sleeve, and the piston skirt is avoided damaging. Sequentially, the possibility of the occurrence of cylinder scoring of a motor is reduced. The length of the middle of the shaped conductor of the piston skirt, which is the length of the detection part of the diameter of an auxiliary cylinder, is lengthened, and the contact area of the piston and an inner surface of an air cylinder is enhanced. Thus, the stress of the unit area of the piston skirt and the inner surface of the air cylinder is reduced, and the possibility of the occurrence of cylinder scoring of the motor is reduced. Simultaneously, the smoothness of the movement of the piston is also improved.

Description

A kind of piston with improvement skirt section structure

Technical field

The utility model belongs to technical field of engines, relates to the improvement to the piston of gasoline engine molded lines, specifically is a kind of piston that improves the skirt section structure that has.

Background technique

Existing piston of gasoline engine molded lines is considered the robust motion of piston in cylinder barrel, the maximum diameter of piston is controlled at the lower edge of piston skirt.But piston is when lower dead center, and the piston skirt can move to the cylinder barrel outside, thereby makes the piston skirt can not get next support to cylinder barrel; When piston continued to move upward, the piston skirt can be swung, and at this moment, meeting surface, scratch piston skirt, cylinder barrel bottom makes motor that the possibility that scuffing of cylinder bore takes place be arranged.See Fig. 1,1 is cylinder barrel among the figure, the 2nd, and piston, the 22nd, the skirt section of piston.Referring to Fig. 2, the part that dotted line pulls out among the figure is the enlarged view of skirt section molded lines, and as can be seen from the figure, the lower edge of this skirt section molded lines is straight.

Summary of the invention

The purpose of this utility model is to overcome the defective that existing piston skirt molded line exists, a kind of piston that improves the skirt section structure that has is provided, reduce the possibility of motor generation scuffing of cylinder bore by the shape that changes piston skirt molded line, reduce the stressed of piston skirt and cylinder barrel internal surface unit area, improve the robust motion of piston.

The technical solution of the utility model is as follows:

A kind of piston with improvement skirt section structure includes piston head and piston skirt, and inwardly shrink the bottom of piston skirt, with the piston skirt molded line middle part, promptly joins the length lengthening that cylinder diameter detects the position.

Be designed to inside contraction by bottom molded lines, can avoid the bottom, piston skirt to swipe, damage piston skirt, thereby the possibility of reduction motor generation scuffing of cylinder bore with the cylinder sleeve bottom margin with the piston skirt; By increasing molded lines middle part (join cylinder diameter and detect the position) length, can increase the area of contact of piston and cylinder barrel internal surface, thereby reduce the stressed of piston skirt and cylinder barrel internal surface unit area, reduce the possibility of motor generation scuffing of cylinder bore, also can improve the robust motion of piston simultaneously.

Description of drawings

Fig. 1 is the phase diagram of piston in cylinder;

Fig. 2 is the skirt section conventional structure figure of existing piston;

Fig. 3 is the piston skirt structural drawing after the utility model improves.

Embodiment

Referring to Fig. 3,2 is pistons among the figure, the 21st, piston head, the 22nd, the piston skirt, the utility model improves the skirt section structure of piston, and its molded lines amplifies sees the part that dotted line pulls out among the figure, as can be seen from the figure, inwardly shrink the bottom 221 of piston skirt, piston skirt molded line middle part 222, and the length of promptly joining cylinder diameter detection position is lengthened out.

Claims

1, a kind of piston with improvement skirt section structure includes piston head and piston skirt, and be characterised in that: inwardly shrink the bottom of piston skirt, and the length lengthening that cylinder diameter detects the position is promptly joined at the piston skirt molded line middle part.