CN2390012Y

CN2390012Y - Piston combustion chamber of YC 4108 Q diesel engine

Info

Publication number: CN2390012Y
Application number: CN99238192U
Authority: CN
Inventors: 黄镇平
Original assignee: Guangxi Yuchai Machinery Co Ltd
Current assignee: Guangxi Yuchai Machinery Co Ltd
Priority date: 1999-07-23
Filing date: 1999-07-23
Publication date: 2000-08-02
Anticipated expiration: 2009-07-23

Abstract

The utility model discloses a piston combustion chamber of a YC 4108 Q diesel engine, comprising a piston body, a ring groove, a wearproof inlaid ring, a combustion chamber and pits. The utility model is characterized in that the volume of the combustion chamber (8) containing the pits (3) measured by a burette through water-fluid measurement is 45.7 mL plus or minus 0.8 mL, and the combustion chamber (8) is composed of main chamber circles (16) and the pits (3); the main circles (16) are omega-shaped combustion chambers, and top circles of the main circles (16) are crossed with the circular diameter of the pits (3); more than one main chamber circle (16) and pits (3) are arranged, and the compressed height (22) between the central line of a piston pin hole and the top surface of a piston is 65.4 mm minus or plus 0.05 mm. A diesel engine using the piston has the advantages of low noise, large horsepower, low oil consumption, light weight, low exhaust smoke degree, large compression ratio, etc. The utility model is suitable for various diesel engines having four cylinders.

Description

YC4108Q diesel engine piston firing chamber

The utility model relates to a kind of diesel engine piston, particularly a kind of YC4108Q diesel engine piston firing chamber.

Mostly used diesel engine piston is that deepening laminar surface with casting handles at present, the annular groove pot type piston ring of packing into, also have and in annular groove, be bumped into wear-resisting circle, the firing chamber is to dig low plane to form in the end face center portion, these pistons can not satisfy diesel engine often far away to be used, and there is heaviness, defectives such as noise is big, exhaust smoke is high, oil consumption height.

The purpose of this utility model is that big of former existing piston structure is constant, mainly be to open a toroidal combustion chamber at the center of piston-top surface, and open two valves hole of stepping down at the firing chamber end face, reach like this and make piston organize intake swirl good, fuel combustion is abundant, reduce environmental pollution, reach in light weight, noise is low, horsepower is big, cost is low, is applicable to the YC4108Q diesel engine piston firing chamber of four cylinder series models.

Technical solution of the present utility model is such.Big of structure of piston is constant, but transforms in the piston-top surface center portion.The volume of firing chamber (contain valve step down hole) is 45.7 ± 0.5ml, and the firing chamber is made of main chamber's circle and pit, and main chamber's circle is a toroidal combustion chamber, and dome face circle in main chamber's intersects with pit, and the main chamber is round, pit respectively has more than one.The bottom surface, firing chamber is the R7 transition arc, the top margin angle is the R1 transition arc, the top angle is 140 at the bottom of the firing chamber, distance to the piston head upper thread at the bottom of the firing chamber is 17.5mm, piston-top surface is 30mm to piston cavity end face distance, and piston pin hole center line to the compression height of piston-top surface is 65.4 ± 0.05mm.The anodization thickness of piston head, combustion recess is 〉=30 μ m, and the piston skirt is coated with the 0.02mm graphite layer.

The utility model has the advantages that the diesel engine pressure that assembles with this piston is big, in light weight, cost is low, power is big, moment of torsion is big, it is little to reach volume, boundary dimension 870 * 670 * 780mm, nt wt net weight≤350Kg, noise level limit≤115dB (A), delivery temperature≤650 ℃, exhaust smoke≤4.0FSN, the minimum fuel oil consumption of external characteristics 228g/kw.h, Maximum Torque/rotating speed 268N.m/1900-2200r/min, nominal power 75kw/3000r/min, total displacement 4.214L.

It is such that structure of the present utility model constitutes.

Fig. 1 looks sectional view for overall structure master of the present utility model.

Fig. 2 looks whole-cutaway view for an overall structure of the present utility model left side.

Fig. 3 is an overall structure plan view of the present utility model.

Fig. 1, Fig. 2, among Fig. 3, piston body (1), piston-top surface (2), valve pit (3), base, firing chamber (4), piston cavity end face (5), firing chamber center line (6), piston center line (7), firing chamber (8), abrasion-proof inserted ring (9), piston ring groove (10), piston ring land (11), piston-top surface is to inner chamber end face distance (12), piston-top surface is to base, firing chamber distance (13), firing chamber closing in angle (14), projection angle (15) at the bottom of the firing chamber, main chamber, firing chamber circle (16), convex top transition arc (17), circular arc at the bottom of the firing chamber (18), piston cavity (19), piston pin hole eccentric distance (20), key seat home position (21), piston compression height (22), the valve pit is to the eccentric coordinate (29 in piston center, 23,24), the diameter (25 of valve pit, 26), the center, firing chamber is to the eccentric coordinate (27 in piston center, 28).

Most preferred embodiment of the present utility model is such, with reference to Fig. 1, Fig. 2, shown in Figure 3, the cylindrical of piston body, annular groove, pin-and-hole, endoporus, bottom surface, end face etc. are all close with existing piston body, are that its bond quality of high-nickel austenitic cast iron (ZBL2003-87) should meet ZBJ12006-89 (pressure ratio＞2) but annular groove (10) pincers have the abrasion-proof inserted ring material.The core of the end face (2) of piston body (1) is firing chamber (8), firing chamber (8) adds pit by toroidal combustion chamber main chamber circle (16) and constitutes, the circle footpath (25) of pit (3) is Φ 44.5+0.5mm, dark 0.5+0.4mm, circle footpath (26) Φ 49+0.5mm, dark 0.5+0.5mm.The cylindrical line handing-over of the circular arc line of pit (3) and the main chamber of firing chamber circle (16).The external diameter of main chamber's circle (16) is wide to be Φ 62mm, the circular arc on base (4) is R7, base angle angle (15) is 140 °, end face (2) to the transition arc of firing chamber is R1, the topcross angle transition arc R7 of end angle (15), the oblique angle in point of contact between the R1 to R7 (14) is 10 °, main circle in firing chamber and piston are stopped the centre distance throw of eccentric: laterally be 4mm, be 2mm vertically, two pits (3) vertically are 9 ± 0.13mm to piston center throw of eccentric, horizontal sequence number (23) is 30 ± 0.15mm, dark is 0.5+0.5mm, sequence number (24) be 24.5 ± 0.15mm, dark is 0.5+0.4mm, and the base (4) of firing chamber (8) is 17.5mm to the distance of piston-top surface (2), and piston inner hole end face (5) to the distance of piston-top surface (2) is 30mm.Piston pin hole center line to the compression height (22) of piston-top surface is 65.4 ± 0.05mm.The technical requirements that piston is made is by as follows:

(1), materials chemistry composition (%): Ni0.8～1.3, Fe≤0.7, Mg0.8～1.3, Si11～13, Cu0.8～1.5, Ti≤0.2, Mn≤0.3, Zn≤0.3, AL surplus.

(2), heat treatment: twice heat treatment (being similar to SAE-76) hardness, 100～130HBS.

(3), the skirt section graphitization, coating thickness is 0.02.

(4), 20 ℃ the time, the mean specific gravity of aluminum alloy is 2.68-2.74g/cm ³

(5), piston head (comprising combustion recess) anodization thickness is 〉=30 μ m, the combustion recess volume is 45.7 ± 0.5mL (contains valve step down hole volume).

(6), on the same group piston mass poor≤5g.

Measure when (7), all sizes all should coating be handled preceding 21 ℃.

(8), do not annotate the curving of castings≤3, molding gradient≤3 °.

(9), the GB3508 regulation is pressed in metallographic structure.

(10), do not annotate the processing dimension tolerance and carry out by GB/T1804-92IT12, annotate the casting tolerance of size and press the GB6414-86CT6 execution.

(11), wear-resisting edge roundwood material is that its bond quality of nickelic Chou Shi body cast iron (ZBJ92003-87) should meet ZBJ12006-89 (pressure ratio＞2).

(12), all the other do not use up the regulation that technical specifications should meet GB/T1148-93.

(13), deburring.

Claims

1, a kind of YC4108Q diesel engine piston firing chamber, comprise by piston body, piston-top surface, base, firing chamber, piston inner hole end face, firing chamber, combustion recess, abrasion-proof inserted ring, piston ring groove, it is characterized in that it is 45.7 ± 0.5ml that firing chamber (8) contains the step down volume in hole (3) of valve, firing chamber (8) is made of main chamber's circle (16) and pit (3), main chamber's circle (16) is a toroidal combustion chamber, main chamber's circle (16) end face is round to intersect with pit (3) circle footpath, and more than one main chamber round (16) and pit are arranged.

2,, it is characterized in that the anodization thickness of piston head, combustion recess is 〉=30 μ m according to the described YC4108Q diesel engine piston of claim 1 firing chamber.