CN203285561U

CN203285561U - Engine piston

Info

Publication number: CN203285561U
Application number: CN2013203164589U
Authority: CN
Inventors: 方珞妃
Original assignee: Individual
Current assignee: Individual
Priority date: 2013-06-01
Filing date: 2013-06-01
Publication date: 2013-11-13
Anticipated expiration: 2023-06-01

Abstract

The utility model provides an engine piston, and belongs to the technical field of engines. The engine piston solves the technical problems that an existing engine is low in heat efficiency and the like. The engine piston comprises a head portion and a skirt portion. The head portion is provided with a combustion chamber. An yttrium oxide heat insulation coating electrically coats the inner wall of the combustion chamber. The thickness of the heat insulation coating is 80nm-300nm. The engine piston has the advantages of being high in heat efficiency and the like.

Description

A kind of engine piston

Technical field

The utility model belongs to technical field of engines, relates to a kind of engine piston.

Background technique

The function of piston is to bear gas pressure, and passes to connecting rod by wrist pin and order about crankshaft rotating, piston head or the constituent element of firing chamber.Piston at high temperature, high pressure, at a high speed, work under the condition of insufficient lubrication, piston directly contacts with high-temperature gas, more than transient temperature can reach 2500K, therefore is heated serious, and radiating condition is very poor, top is up to 600～700K, and temperature distribution is very inhomogeneous, and it is very large that piston head bears gas pressure, particularly expansion space stroke pressure is maximum, petrol engine is up to 3～5MPa, and diesel engine is up to 6～9MPa, and its working environment is extremely abominable.

In sum, for the requirement of piston, mainly contain two, the one, make as much as possible the heat in firing chamber outer loose; The 2nd, piston only needs good heat dissipation, and these two conditions cause in the design process of piston and have contradiction, and good heat dissipation may cause heat loss, and the heat insulation piston radiating effect that may cause is poor.

Novel piston with cast-iron structure is disclosed in patent (CN201650483U), its structure is: it comprises piston skirt and piston head, described piston head is connected by muscle with piston skirt, it can simplify the piston manufacturing process, reduce the weight of piston group, improve the performance of motor, particularly reduce noxious emission, but, because the place, firing chamber does not have the structure that how to prevent heat loss is set, cause the engine thermal efficiency at this piston place lower.

Summary of the invention

The purpose of this utility model is the problems referred to above that exist for existing technology, and a kind of engine piston is provided, and technical problem to be solved in the utility model is how to improve engine thermal efficiency.

The purpose of this utility model can realize by following technical proposal: a kind of engine piston, comprise head and skirt section, it is characterized in that, described head has a firing chamber, described Inner Wall of Combustion Chamber powers on and is coated with the yttrium dioxide heat insulating coat, described heat insulating coat thickness be 80nm～300nm.

Working principle of the present utility model is: the yttrium dioxide that EFI is coated on Inner Wall of Combustion Chamber has excellent heat insulation and heat reflection effect, make the heat in firing chamber as much as possible for acting, and, owing to being provided with heat insulating coat, the heat that is dispersed into piston crown and skirt section is relative less, can greatly reduce the heat radiation pressure of piston, thereby need to the radiation hole of various abnormal shapes be set when making piston, also can save cost of production and enhance productivity; Chinese Academy of Sciences Microelectronics Institute's microelectronic component and integrated technology key lab disclose in periodical [heat processing technique] 20 interim technology that EFI of yttrium dioxide have been coated with in the 2011st, and the piston that EFI scribbles this coating is particularly useful in powerful diesel generator.

In above-mentioned a kind of engine piston, described skirt section is provided be used to the pin-and-hole that plugs wrist pin, and the two ends of described pin-and-hole have respectively a step hole.Wrist pin is plugged in this pin-and-hole and is connected with the connecting rod that is set on bent axle; The setting of this step hole, be conducive to the dismounting (the wrist pin two ends could meet the demand of pistons work lower than the piston outer ring, thereby cause wrist pin to be difficult to dismounting) of wrist pin.

In above-mentioned a kind of engine piston, be provided with a loss of weight chamber between described skirt section and head.Piston lightweight degree is to affect the direct factor of engine power; Owing to being provided with heat insulating coat in this piston, the size in this loss of weight chamber can larger than general piston loss of weight chamber (certainly, the size in this loss of weight chamber still needs to consider engine displacement and engine type), thereby the lightweight degree is higher.

In above-mentioned a kind of engine piston, described head outer ring is provided with two sealing gland annular grooves and an oil sealing annular groove.In the sealing gland annular groove, compression ring is installed, is used for the sealing of gas between piston and cylinder body, in the oil sealing annular groove, oil ring is installed, be used for barrier machine oil etc., avoid firing chamber the phenomenon of burn oil to occur.

In above-mentioned a kind of engine piston, be provided with the heat radiation chamber of annular in described head.Heat radiation is the basic demand of engine piston, and the heat radiation chamber is set can under the effect of machine oil, partly leave the heat on piston only.

Compared with prior art, the utlity model has following advantage:

1, the inwall of this engine piston in firing chamber powers on and is coated with one deck yttrium dioxide heat insulating coat, can carry out barrier and reflection to the heat in firing chamber, thereby improves the thermal efficiency of motor.

2, be provided with the loss of weight chamber between the head of this piston and skirt section, can improve the lightweight degree of piston.

Description of drawings

Fig. 1 is the sectional view of this piston.

In figure, 11, head; 12, skirt section; 2, firing chamber; 3, heat insulating coat; 4, pin-and-hole; 41, step hole; 5, loss of weight chamber; 61, sealing gland annular groove; 62, oil sealing annular groove; 7, heat radiation chamber.

Embodiment

Be below specific embodiment of the utility model and by reference to the accompanying drawings, the technical solution of the utility model is further described, but the utility model be not limited to these embodiments.

as shown in Figure 1, a kind of engine piston, comprise head 11 and skirt section 12, head 11 has a firing chamber 2, firing chamber 2 inwalls power on and are coated with yttrium dioxide heat insulating coat 3, heat insulating coat 3 thickness be 80nm～300nm, skirt section 12 is provided be used to the pin-and-hole 4 that plugs wrist pin, the two ends of pin-and-hole 4 have respectively a step hole 41, and wrist pin is plugged in this pin-and-hole 4 and is connected with the connecting rod that is set on bent axle, the setting of this step hole 41, (the wrist pin two ends could meet the demand of pistons work lower than the piston outer ring to be conducive to the dismounting of wrist pin, thereby cause wrist pin to be difficult to dismounting), be provided with a loss of weight chamber 5 between skirt section 12 and head 11, piston lightweight degree is to affect the direct factor of engine power, owing to being provided with heat insulating coat 3 in this piston, the size in this loss of weight chamber 5 can be larger (certainly than general piston loss of weight chamber 5, the size in this loss of weight chamber 5 still needs to consider engine displacement and engine type), thereby the lightweight degree is higher, head 11 outer rings are provided with two loss of weight chambeies 5 and an oil sealing annular groove 62, in loss of weight chamber 5, compression ring is installed, be used for the sealing of gas between piston and cylinder body, in oil sealing annular groove 62, oil ring is installed, be used for barrier machine oil etc., avoid firing chamber 2 phenomenon of burn oil to occur, be provided with the heat radiation chamber 7 of annular in head 11, heat radiation is the basic demand of engine piston, heat radiation chamber 7 is set can be under the effect of machine oil, heat on piston only is partly left.

Working principle of the present utility model is: the yttrium dioxide that EFI is coated on 2 inwalls of firing chamber has excellent heat insulation and heat reflection effect, make the heat in firing chamber 2 as much as possible for acting, and, owing to being provided with heat insulating coat 3, the heat that is dispersed into piston crown 11 and skirt section 12 is relative less, can greatly reduce the heat radiation pressure of piston, thereby need to the radiation hole of various abnormal shapes be set when making piston, also can save cost of production and enhance productivity; Chinese Academy of Sciences Microelectronics Institute's microelectronic component and integrated technology key lab disclose in periodical [heat processing technique] 20 interim technology that EFI of yttrium dioxide have been coated with in the 2011st, and the piston that EFI scribbles this coating is particularly useful in powerful diesel generator.

Specific embodiment described herein is only to the explanation for example of the utility model spirit.The utility model person of ordinary skill in the field can make various modifications or supplements or adopt similar mode to substitute described specific embodiment, but can't depart from spirit of the present utility model or surmount the defined scope of appended claims.

Claims

1. engine piston, comprise head (11) and skirt section (12), it is characterized in that, described head (11) has a firing chamber (2), described firing chamber (2) inwall powers on and is coated with yttrium dioxide heat insulating coat (3), and the thickness of described heat insulating coat (3) is 80nm～300nm.

2. a kind of engine piston according to claim 1, is characterized in that, described skirt section (12) are provided be used to the pin-and-hole that plugs wrist pin (4), and the two ends of described pin-and-hole (4) have respectively a step hole (41).

3. a kind of engine piston according to claim 1 and 2, is characterized in that, is provided with a loss of weight chamber (5) between described skirt section (12) and head (11).

4. a kind of engine piston according to claim 1 and 2, is characterized in that, described head (11) outer ring is provided with two sealing gland annular grooves (61) and an oil sealing annular groove (62).

5. a kind of engine piston according to claim 1 and 2, is characterized in that, is provided with the heat radiation chamber (7) of annular in described head (11).