CN2100493U

CN2100493U - Convex elliptic piston in 95 series diesel engine

Info

Publication number: CN2100493U
Application number: CN 91211668
Authority: CN
Inventors: 王锡纯
Original assignee: XIXIA PISTON FACTORY SHANDONG
Current assignee: XIXIA PISTON FACTORY SHANDONG
Priority date: 1991-05-13
Filing date: 1991-05-13
Publication date: 1992-04-01

Abstract

The utility model discloses a piston for 95 type diesel engine can be used to single cylinder diesel engine, also can be used to multi-cylinder diesel engine. The piston skirt is in a structural shape of a convex reducing ellipse, and the rule is that the major diameter is changed from small to large and then becomes small from the bottom end of the skirt to the upper part, the minor diameter is changed from large to small, and the gap between the piston and the cylinder is reduced. The piston skirt part has uniform contact surface, enough bearing area bears the side thrust force applied to the piston to ensure the stable motion of the piston, and can form a uniform oil film, reduce the resistance and reduce the unnecessary power loss.

Description

Projected elliptical piston of 95 series diesel engines

The utility model relates to 95 type used for diesel engine pistons.Can be used for single cylinder diesel engine, also can be used for the multiple cylinder diesel motor.

This assembly of piston and cylinder is the critical piece that diesel engine produces power.Diesel oil burns under the inner high voltage of the chamber of this assembly, under the combustion gas high pressure effect of generation, promotes piston motion, by connecting rod, bent axle, thermal power transfer is become mechanical energy, reaches the purpose of work done.Present 95 serial diesel motor piston skirt sections are the right cone ellipse.People reduce oil consumption and noise in order to improve the performance of diesel engine, have done a large amount of improvement design works.From the change of cylinder head and piston head shape, improve combustion position and compression ratio, to the shape that changes piston ring, improve sealability.But the performance of diesel engine changes not quite always, though through trial in many ways, this traditional structural type of piston never has great improvement.People generally believe the change of shape may cause piston under high pressure, high heat, work the distortion stuck in cylinder.Be difficult to break through the shape and the structure that have now reached.

The purpose of this utility model is to change the structure shape and the size of piston skirt, to reach the performance that changes diesel engine, to improve power, to reduce oil consumption, to reduce noise.

The utility model is achieved in that with the piston skirt cross section it is the structure shape of reducing ellipse, the major diameter of each cross section ellipse and minor axis are not wait respectively, its rule is from the bottom, skirt section, the major diameter that makes progress changes from small to big and diminishes, minor axis is for from large to small, and, reach the piston skirt and the cylinder surface of contact is even to reduce the method for cylinder prepareding gap, there are enough bearing areas to bear the side-thrust that piston is subjected to.Owing to be the reducing ellipse, when the piston thermal expansion, bulk deformation is even.The piston skirt section leading role that keeps positive treadle-operated tilt hammer for hulling rice at the volley guarantees that motion steadily.And can form uniform oil film, and having reduced friction, resistance is little, has reduced unnecessary power loss.

The oval maximum diameter of its skirt section reducing optimum position is at the 18 millimeters places that made progress by the bottom, skirt section.

The vertical profilogram of periphery that its skirt section major diameter end points forms, coordinate is numerical value in tabulating down.The bottom, skirt section is 0 point.

Horizontal ordinate	Ordinate	Horizontal ordinate	Ordinate
				－0.14	63.5	0.0238	28
－0.084	56.5	0.03	18
				－0.036	46.5	0	0
－0.002	36.5

When its skirt section major diameter is selected optimum size.Because cylinder bore is constant, cylinder prepareding gap of the present utility model reduces, and piston wall changes greatly at oval minor axis place when the piston material thermal expansion, makes piston descend diameter even in working order, has reduced the consumption of machine oil.

Be illustrated as embodiment of the present utility model.

Fig. 1: 95 serial diesel engine motor middle-bulged varying ellipse pistons;

Fig. 2: the skirt section becomes the major diameter end points and forms the skirt section profilogram.

Piston top is the groove of dress piston ring, is the upper end, piston skirt since 63.5 mm sizes, and the skirt section cross section is some oval compositions.And major diameter that each is oval and minor axis are all unequal respectively.Maximum major diameter is at 18 millimeters places, bottom, distance skirt section, and maximum minor axis is in the bottom, skirt section.Skirt section profilogram and piston that the major diameter end points forms, Xiao hole is vertical.Thick-walled structures such as the skirt section is, its concrete size is as follows

The position	The major diameter size	The minor axis size	The position	The major diameter size	The minor axis size
						d1	d-0.170±0.005	94.56±0.01	d5	d-0.0062±0.005	94.777±0.01
d2	d-0.114±0.005	94.624±0.01	d	-	94.798±0.01
						d3	d-0.066±0.005	94.687±0.01	d6	d-0.030±0.005	94.784±0.01
d4	d-0.028±0.005	94.74±0.01

The bottom, skirt section is the curve of 120 millimeters of radiuses at place, minor axis orientation, and this structure has been saved used material, does not influence usability.

Claims

1, a kind of 95 serial diesel engine motor middle-bulged varying ellipse pistons, it is characterized by the structure shape that the piston skirt cross section is the reducing ellipse, the major diameter of each cross section ellipse and minor axis are not wait respectively, its rule is from the bottom, skirt section upwards, major diameter changes from small to big and diminishes, minor axis and reduces cylinder prepareding gap from large to small.

2,, it is characterized by the oval maximum diameter of skirt section reducing optimum position at the 18 millimeters places that make progress by the bottom, skirt section according to claim 1 described 95 serial diesel engine middle-bulged varying ellipse pistons.

3, according to claim 1 described 95 serial diesel engine middle-bulged varying ellipse pistons, when it is characterized by skirt section major diameter selection optimum size, cylinder prepareding gap reduces.

4, according to claim 1 described 95 serial diesel engine middle-bulged varying ellipse pistons, the vertical profilogram of periphery, the coordinate that it is characterized by skirt section major diameter end points formation are numerical value in tabulating down.(bottom, skirt section is 0 point)