CN202970935U

CN202970935U - Engine piston

Info

Publication number: CN202970935U
Application number: CN 201220568812
Authority: CN
Inventors: 田华清; 胡永安
Original assignee: Chongqing Push Mechanism Co Ltd
Current assignee: Chongqing Push Mechanism Co Ltd
Priority date: 2012-10-31
Filing date: 2012-10-31
Publication date: 2013-06-05
Anticipated expiration: 2022-10-31

Abstract

The utility model belongs to the technical field of pistons, and particularly discloses an engine piston. The engine piston comprises a piston top and a skirt part fixedly connected with the piston top, wherein a deep-basin combustion chamber is arranged at the piston top, and an outer wall of the skirt part, which is a minor axis in an axial direction of a piston pin hole of the outer wall and a major axis in a radial direction of the piston pin hole of the outer wall is elliptic. According to the engine piston, a shallow-basin combustion chamber at the piston top is improved to the deep-basin combustion chamber; mixed gas of a spiral gas flow flows more smoothly in the combustion chamber, and can be combusted fully; carbon deposition on a top face of the piston is reduced; discharge of an engine reaches a higher discharge requirement; environmental pollution is reduced; a compression ratio is reduced effectively; combustion detonation pressure of the engine is reduced; the operation of the engine is more stable; and combustion noises of the engine are reduced. In addition, a convex elliptic structure of an outer circle of the skirt part effectively overcomes the defect due to the fact that the skirt part expands when being heated; oil distribution can be conducted on a gas cylinder sleeve effectively during up and down operation of the piston; and the service life of the piston is prolonged.

Description

Engine piston

Technical field

The utility model belongs to the piston technical field, is specifically related to a kind of middling speed gas engine piston.

Background technique

Present medium speed diesel engines adopts integral body or the built-up piston of tubular more, and cooling oil duct or oil pocket are established in inside, and piston top adopts the shallow basin of " W " type firing chamber.Because protrude at the center, firing chamber, the heat maximum region that causes jetting out flames is annular, and the burning molecule can't be concentrated, and molecule is difficult to interconnect burning, and velocity of combustion slows down, and has increased thermal loss.Because piston need to move back and forth in cylinder barrel, this just needs to guarantee the structure of whole piston simultaneously.Yet the high temperature thermal conductance causes working life and utilization efficiency that the meetings such as the stress of skirt section or piston steel top expands, is heated reduce whole piston.

Summary of the invention

For above-mentioned deficiency of the prior art, the utility model aims to provide a kind of engine piston, improved the mobility of mixed gas in the firing chamber, make mixture combustion more abundant, reduced the carbon distribution of piston-top surface, reduce the pollution to environment, simultaneously, improved the working life of whole piston.

To achieve these goals, the technical solution of the utility model: a kind of engine piston, it comprises piston head and the skirt section that is connected with it, described piston head is established dark basin shaped combustion chamber; Described skirt section outer wall be one along its piston pin hole axially for minor axis, radially be the elliptical shape of major axis.

Further, described piston head is steel roof construction and one forging forming; Have some cooling oil chambers in this piston head, these some cooling oil chambers are symmetrical along its medial axis at piston head; Be provided with in position, described piston medial axis and be communicated with cooling oil chamber and provide the cooling lubricating oil pipeline of cooling lubricating oil for it.

Described skirt section is the moulding of spheroidal graphite cast iron integrally casting; On this skirt section, the ovality of the end of close piston head is 0.2mm; Ovality away from the end of piston head is 0.4mm.

The beneficial effects of the utility model: " W " shallow basin type firing chamber of piston head is improved to dark basin shaped combustion chamber, the mixed gas that makes spiral air flow flowing in the firing chamber is more smooth and easy, mixed gas can burn fully, reduced the carbon distribution of piston-top surface, allow the discharging of motor reach higher emission request, reduced the pollution to environment; Simultaneously effectively reduce compression ratio, reduced the burning detonation pressure of motor, made the operation of motor more steady, also reduced the combustion noise of motor.Simultaneously to adopt cylindrical be the oval structure of convexity in the skirt section, effectively avoided the adverse effect brought because of its expanded by heating, can effectively carry out cloth oil to cylinder liner the in service of piston up and down, extended the working life of piston, cylinder liner and piston ring.

Description of drawings

In order to be illustrated more clearly in the utility model embodiment or technological scheme of the prior art, the below will do to introduce simply to the accompanying drawing of required use in embodiment or description of the Prior Art, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.

Fig. 1 is structural representation of the present utility model;

Fig. 2 is the structural representation in skirt section in Fig. 1.

Embodiment

Further describe the utility model below in conjunction with specific embodiment and accompanying drawing.

A kind of engine piston as depicted in figs. 1 and 2 comprises piston head 1 and the skirt section 2 that is connected with it, and described piston head 1 is established dark basin shaped combustion chamber 3; Described skirt section 2 outer walls be one along its piston pin hole axially for minor axis, radially be the elliptical shape of major axis.

The utility model has the advantage of the dark basin shaped combustion chamber 3 of design and be designed to elliptical shape at the skirt section of piston 2 cylindricals.Improve the abundant burning of mixed gas, reduced the carbon distribution of piston-top surface, allow the discharging of motor reach higher emission request, reduced the pollution to environment; Simultaneously effectively reduce compression ratio, reduced the burning detonation pressure of motor, made the operation of motor more steady, also reduced the combustion noise of motor.Adopting simultaneously cylindrical is the oval structure of convexity, has effectively avoided the adverse effect brought because of its expanded by heating, can effectively carry out cloth oil to cylinder liner the in service of piston up and down, has extended the working life of piston, cylinder liner and piston ring.

Described piston head 1 is steel roof construction and one forging forming, and through heat treatment and accurate machining, allows it have good intensity, stiffness and size, accuracy to shape.Have some cooling oil chambers 4 in described piston head 1, vibration by cooling lubricating oil is cooling, lubricating oil is taken away most of heat that piston top is passed in combustion gas, reduce piston top and passed to the heat of piston ring, extend the working life of piston ring, and symmetrical along its medial axis at piston head 1 by these some cooling oil chambers 4, make the temperature of piston head 1 own consistent.Be provided with in position, described piston medial axis and be communicated with cooling oil chamber 4 and provide the cooling lubricating oil pipeline 5 of cooling lubricating oil for it.

In addition, described skirt section 2 is the moulding of spheroidal graphite cast iron integrally casting, and the ellipsoidal structure on cylindrical has been avoided the adverse effect of bringing because of its expanded by heating effectively, can effectively carry out cloth oil to cylinder liner the in service of piston up and down, extend the working life of piston, cylinder liner and piston ring.Particularly, the ovality n of the end of close piston head 1 on described skirt section 2 ₁Be 0.2mm; Ovality n away from the end of piston head 1 ₂Be 0.4mm.

The above technological scheme that the utility model embodiment is provided is described in detail, used specific case herein the utility model embodiment's principle and mode of execution are set forth, above embodiment's explanation is only applicable to help to understand the utility model embodiment's principle; Simultaneously, for one of ordinary skill in the art, according to the utility model embodiment, all will change on embodiment and application area, in sum, this description should not be construed as restriction of the present utility model.

Claims

1. engine piston is characterized in that: comprise piston head and the skirt section that is connected with it, described piston head is established dark basin shaped combustion chamber; Described skirt section outer wall be one along its piston pin hole axially for minor axis, radially be the elliptical shape of major axis.

2. engine piston according to claim 1, it is characterized in that: described piston head is steel roof construction and one forging forming.

3. engine piston according to claim 1 and 2, it is characterized in that: have some cooling oil chambers in described piston head, these some cooling oil chambers are symmetrical along its medial axis at piston head.

4. engine piston according to claim 3, is characterized in that: be provided with the connection cooling oil chamber in position, described piston medial axis and provide the cooling lubricating oil pipeline of cooling lubricating oil for it.

5. engine piston according to claim 1, it is characterized in that: described skirt section is the moulding of spheroidal graphite cast iron integrally casting.

6. engine piston according to claim 1 or 5 is characterized in that: the ovality near the end of piston head on described skirt section is 0.2mm; Ovality away from the end of piston head is 0.4mm.