CN2329775Y

CN2329775Y - Piston device for internal combustion engine

Info

Publication number: CN2329775Y
Application number: CN 97251087
Authority: CN
Inventors: 李德民
Original assignee: Individual
Current assignee: Individual
Priority date: 1997-12-05
Filing date: 1997-12-05
Publication date: 1999-07-21
Anticipated expiration: 2007-12-05

Abstract

The utility model relates to a piston device which comprises a piston, a piston ring, etc., wherein the piston ring is provided with a radial staircase-shaped overlapping notch, the piston is only provided with a piston ring groove, and two radial staircase-shaped overlapping piston rings are arranged in the piston ring groove. The piston and a cylinder can be completely sealed by the piston device. The utility model has the characteristics of small axial structure size, small quality, small inertia and high-speed running adaptation. The utility model can be widely used for various internal-combustion engines.

Description

A kind of piston for IC engine device

The utility model relates to a kind of improved piston apparatus, belongs to internal combustion engine device technique field.

At present, it is multiple that the form of cut or cuts of piston ring has straight cut, angular cut, axial overlap joint etc. in the piston apparatus, the piston ring of straight cut, angular cut form wherein, because otch forms the leakage way of straight-through type, therefore the incision site that no matter several roads piston ring is set and each is encircled on piston interlaces to open and puts, and all can not realize the sealing fully between piston and the cylinder.And the increase of piston number of rings can cause the axial arrangement size of piston and the friction between piston ring and the cylinder to increase.In internal-combustion engine, the frictional work loss between piston ring and the cylinder accounts for the 60-70% of the whole frictional work losses of internal-combustion engine, and therefore, the simple sealing problem that relies on the number of rings that increases piston ring to solve piston apparatus is worthless.The piston ring of axial overlap joint type otch, two cut ends of its ring are the axial step shape and axially overlap mutually, though the otch of this form can not form direct leakage way, but the compressed gap that the overlap joint two ends is reserved can be communicated with each other by the gap at the piston ring back side and be formed leakage way, therefore can not realize the sealing fully of piston apparatus.In the operation of internal-combustion engine is used, the compressed gap of piston ring can constantly increase along with the increase in piston ring and cylinder wear gap, the sealability of piston apparatus is further descended, the bigger loss of outburst gas when pressurized gas and descent of piston in the time of can causing piston stroking upward when serious, cause internal-combustion engine because of air pressure starts difficulty inadequately, power reduces, also can cause the serious oil of scurrying simultaneously, oil consumption is increased significantly, and bring the carbon distribution that is stranded burning machine oil and causes to increase, make piston ring sticking, stuck and institute's discharge tail gas severe overweight problem of environment pollution caused.Therefore, improve the sealability of piston apparatus, be a key issue in the internal combustion (IC) Engine Design always.

The purpose of this utility model is to provide a kind of piston apparatus with better sealability, and this piston apparatus also should have the characteristics that required piston ring number of rings is few, the frictional work loss is little

The purpose of this utility model is achieved in that

A kind of piston for IC engine device, it comprises piston, piston ring etc., its improvement is, described piston ring 2 has radially stair-stepping overlap joint otch, two stepped otch overlap mutually, settle 2 piston rings with radial orders scalariform overlap joint otch in the piston ring groove 3 on the described piston 1, the dislocation of two-piston rings cut is placed.

Above-mentioned piston apparatus, the otch lap length of described piston ring and the pass between the piston ring diameter are: L=0.021D0.04D.

Above-mentioned piston apparatus, described piston ring otch overlap joint edge is the garden arc.

According to design of the present utility model, piston ring adopts the form of cut or cuts of radial orders scalariform overlap joint, after the sealing of the single groove dual-active plug ring of employing is provided with on the piston, the overlap joint otch that is positioned on the piston ring back side and the outer surface can not be linked up each other because of the obstruct of radial overlap face, the formed leakage way of otch on the piston ring face is protected by the tight envelope of seal ring institute that the dicyclo dislocation forms, thereby, this piston apparatus can be realized better sealing between piston and the cylinder, can reduce the fuel consumption of internal-combustion engine significantly, and internal combustion engine is started easily, the power foot, it is few also to have the piston ring number simultaneously, and the loss of piston apparatus frictional work is little, is suitable for the characteristics of high speed operation.

The utility model is described in further detail below in conjunction with accompanying drawing:

Fig. 1 is the structural representation of the utility model piston apparatus;

Fig. 2 is the A-A sectional view of Fig. 1;

Fig. 3 is the I portion partial enlarged drawing of Fig. 2.

As shown in the figure, radial thickness after two of piston ring 2 radial orders scalariform otch overlap mutually in this piston apparatus is the same with the radial thickness of whole piston ring, its length L that overlaps mutually is long more, sealing is good more, but the Installation Stress of piston ring also can correspondingly increase, this lap length L is advisable with 0.02D-0.04D, and wherein D is the piston ring diameter, like this, the length of overlap joint was bigger when the diameter of ring was big, otherwise less.Free clearance when the piston thermal expansion working clearance S that the cut ends that piston ring overlaps is mutually reserved, piston ring free state and other physical dimensions of piston ring and piston are as axial thickness, the radial thickness of ring, piston upper piston annular groove is to the top bank height of piston-top surface, the back of the body gap of piston ring and piston ring groove, end clearance etc. are consistent with the design and the value principle of prior art all, just give unnecessary details no longer one by one here.

Among Fig. 3, be provided with a transition between the ladder of radial orders scalariform overlap joint otch and connect the garden arc, adopt the arc-shaped transition purpose of connecting, the one, in order to reduce the stress of ladder joint, the 2nd, for the ease of processing.In the internal-combustion engine, piston ring is in high temperature, high pressure, under the abominable working environment of high speed operation, because high temperature, machine oil is easy to gel, knot carbon, thereby be easy to make piston ring stuck, fracture, too high temperature also can make the mechanical strength of ring itself descend simultaneously, joint, the right angle stress of stepped otch two adjacent ladders is concentrated, and radial wall is thinner, and is stressed, be easy to when being hit disconnect from here, the transition that therefore is provided with the garden arc herein connects, the termination of otch also is a corresponding garden arc, certainly, this transition connects other forms such as also can adopting slope shape, and role is the same.

In the utility model, the radial overlap face that two stepped cut ends of piston ring are overlapped mutually separately, on the back side that one is in piston ring, on outer surface that is in piston ring, can not communicate each other, can only on the back side of piston ring, set up back pressure by the gas that enters to the piston ring back side in the gap, piston ring upper and lower end face, make piston ring better tensioner on cylinder wall, and can't let out from the otch of another ring; In the piston ring groove 3 of single setting on the piston body 1; two end faces are in contact with one another, overlap complete sealing ring of piston ring formation that otch staggers mutually; the envelope that otch on the two-piston ring outer surface is tight is protected, thereby can guarantee the completeness sealing between piston and the cylinder.In general, this piston apparatus only need be provided with two piston rings, and two rings are to insert in the annular groove, thereby the axial arrangement size of piston is little, quality is also relative with inertia little, suitable high speed operation, therefore, this piston apparatus is not only applicable to general internal-combustion engine, is applicable to the internal-combustion engine of high-speed enhanced type yet.

Claims

1. piston for IC engine device, it comprises piston, piston ring etc., it is characterized in that, described piston ring [2] has radially stair-stepping overlap joint otch, two stepped otch overlap mutually, settle 2 piston rings with radial orders scalariform overlap joint otch in the piston ring groove [3] on the described piston [1], the dislocation of two-piston rings cut is placed.

2. piston apparatus according to claim 1 is characterized in that, the otch lap length of described piston ring and the pass between the piston ring diameter are: L=0.02D-0.04D.

3. piston apparatus according to claim 2 is characterized in that, described piston ring otch overlap joint edge is the garden arc.