CN201110231Y - Integral marine engine piston - Google Patents

Abstract

The utility model provides an integral marine engine piston, the piston is composed of an integral head, a ring bank and a skirt, wherein the skirt has a pin hole, a shrink mouth type omega-shaped combustion chamber is arranged on the top of the head, a ring-shaped cooling oil cavity is arranged between the combustion chamber and the ring bank and is communicated with a piston inner cavity through an oil inlet and outlet hole, the ring bank adopts a four ring groove structure, a first ring groove is welded with a wear-resistant cast iron ring carrier, the piston adopts an integral structure, a piston roughcast can be once casted, the manufacture is convenient, the production cost is low, the shrink mouth type omega-shaped combustion chamber on the head of the piston is beneficial for improving combustion, the four ring groove structure of the ring bank intensifies the sealing performance, the oil consumption, the air leakage volume and the exhaust emission are lowered, and the using performance is increased. The piston can be used on engines of marine main engines, hull auxiliaries, marine generators and the like.

Description

Integrated type marine engine piston

Technical field

The utility model provides a kind of piston, the piston on especially a kind of marine engine.

Background technique

Marine engine and diesel generating set are all developing to high-power, high load, lightweight direction, and reinforcing degree improves constantly, and emission request is more and more stricter.At present, for marine diesel engine piston high-power, high load, the someone adopts the fabricated structure of steel top aluminium apron, and promptly piston head and piston skirt separate machined are made, and couple together by bolt.Piston head adopts cast iron or forged steel material, and piston skirt adopts the aluminium material manufacturing.This piston has increased processing cost because piston head separates manufacturing with piston skirt, because need long high-strength bolt to connect, overall weight also increases to some extent.

Summary of the invention

Technical problem to be solved in the utility model is, a kind of integrated type marine engine piston is provided, and convenience and usability to improve its manufacturing reduce production costs.

The utility model is to realize like this, integrated type marine engine piston, described piston is made of all-in-one-piece head, ring bank, skirt section, there is pin-and-hole in the skirt section, reducing type ω shape firing chamber is arranged at the top of head, have between the bank annular cooling oil pocket to communicate with piston cavity by the turnover oilhole in the firing chamber with ring, described ring bank adopts Fourth Ring groove structure, and the first annular groove castingin has the wear resisting cast iron edge to enclose.

Adopt the marine engine piston of said structure, adopted monolithic construction, the piston blank one-step casting can be finished, easily manufactured, cost of production is low, and the reducing type ω shape firing chamber of piston crown helps improving burning, the Fourth Ring groove structure of ring bank, strengthen sealability, reduced engine oil consumption, air leakage and toxic emission, improved usability.This piston can be used on the motor of marine engine, hull auxiliaries and marine generator group etc.

Description of drawings

Fig. 1 is the schematic representation of the utility model structure.

Fig. 2 is the A-A sectional drawing of Fig. 1.

Fig. 3 is the plan view of Fig. 1.

Fig. 4 is the rear view of Fig. 1.

Embodiment

The embodiment who provides below in conjunction with accompanying drawing further specifies concrete structure of the present utility model.

As shown in drawings, the integrated type marine engine piston of the utility model, described piston is made of all-in-one-piece head 1, ring bank 9, skirt section 8, there is pin-and-hole 6 in the skirt section, reducing type ω shape firing chamber 2 is arranged at the top of head, have between the bank annular cooling oil pocket 3 to communicate with piston cavity by turnover oilhole 7 in the firing chamber with ring, described ring bank adopts Fourth Ring groove structure, and the first annular groove castingin has the wear resisting cast iron edge to enclose 4.

Groove 4-1 on described wear resisting cast iron edge circle 4 is a dovetail groove.Can improve sealing effect like this.

Having the oil ring groove on oil return blind hole 10 and the ring bank 9 to be connected above the pin-and-hole of described skirt section 8 outer surfaces, the diameter of the face-port 11 around the pin-and-hole is wide at the top and narrow at the bottom less than outside piston and its shape.Like this, both help the machine oil that oil ring scrapes in the piston using process and be back to crankcase, also helped alleviating the overall weight of piston.

The cooling oil pocket communicates with piston cavity by turnover oilhole 7, when piston is worked in motor, machine oil sprays into from the turnover oilhole, and in the cooling oil pocket of annular, shake, flow out from the turnover oilhole again, take away the heat of piston only,, guarantee the functional reliability of piston and piston ring to reduce the operating temperature of piston only.

Two thin oil outlets 5 communicate with the cooling oil pocket.In the using process, the machine oil that flows back to can be delivered in the oilhole of connecting rod small end, be lubricated by oil outlet.

The piston-top surface design has two tapped holes 13, is used for taking out easily when the dismounting piston piston.Piston-top surface has also designed four valve pits 12.

Pin-and-hole can adopt profiled holes, the close outer skirt surface end flare in this hole.Like this, help reducing the mechanical fatigue at piston pin boss position, reduce the generation of fatigue crack, thereby strengthen the intensity at piston pin boss position.

Dodge the oil nozzle of installing on the engine body as need, can design a breach in the lower end, piston skirt, when preventing that piston motion from arriving lower dead center and oil nozzle interfere.

This piston becomes blank through gravity casting, again through the machining moulding of ageing treatment and a plurality of operations.

The whole phosphatization that adopts of piston is handled and the skirt section graphitization processing, helps strengthening the surface strength of piston and the greasy property of skirt section fitting surface.

Accompanying drawing of the present utility model has only shown its structural type, and concrete structure shape, size can be made variation and adjustment under the situation that does not break away from spirit and scope of the present utility model.Can in the 140-190mm scope, adjust as outside diameter.

Claims (3)

1, integrated type marine engine piston, it is characterized in that, described piston is made of all-in-one-piece head (1), ring bank (9), skirt section (8), there is pin-and-hole (6) in the skirt section, top end at head has reducing type ω shape firing chamber (2), have between the bank annular cooling oil pocket (3) to communicate with piston cavity by turnover oilhole (7) in the firing chamber with ring, described ring bank adopts Fourth Ring groove structure, and the first annular groove castingin has wear resisting cast iron to inlay to enclose (4).

2, integrated type marine engine piston as claimed in claim 1 is characterized in that, the groove (4-1) on described wear resisting cast iron edge circle (4) is a dovetail groove.

3, integrated type marine engine piston as claimed in claim 1 or 2, it is characterized in that, have the oil ring groove on oil return blind hole (10) and the ring bank (9) to be connected in the top of the pin-and-hole of described skirt section (8) outer surface, the diameter of the face-port (11) around the pin-and-hole is wide at the top and narrow at the bottom less than outside piston and its shape.

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