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Pressurizing oil-saving type piston of diesel engine

A diesel engine and piston technology, applied in the field of Aeolus 4H supercharged fuel-saving diesel engine pistons, can solve the problems of noise, aggravate hazards, and impair the durability of pistons, so as to reduce wear, prolong piston life, and reduce oil consumption. Effect

Active Publication Date: 2013-09-04
石家庄金刚内燃机零部件集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This is because, if the central axis of the piston pin intersects with the piston axis, when the piston crosses the top dead center and the direction of the side thrust changes, the piston suddenly changes laterally from the side of the secondary thrust surface against the cylinder liner to the side close to the main thrust surface. The other side of the cylinder wall, "slapping" with the cylinder, causing noise and impairing the durability of the piston
Because the moment of impact happens to act on the highest combustion pressure, this increases the hazard.

Method used

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  • Pressurizing oil-saving type piston of diesel engine
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  • Pressurizing oil-saving type piston of diesel engine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Supercharged and fuel-efficient diesel engine pistons, such as figure 1 As shown, including head, skirt 5 and piston pin seat 10. The head is composed of a piston top and a ring groove, that is, the head includes figure 1 From the top down to the third ring groove 8. The skirt refers to the downward part of the third ring groove 8 . The piston pin seat 10 is used to install the connecting rod. A hollow cavity 9 is provided inside the piston.

[0046] The total height of the piston is 113 mm, and the ratio of the total height of the piston to the inner diameter of the cylinder is 1.028. Such as figure 2 As shown, the minimum diameter of the top of the piston head is 107.8mm, and the maximum gap between the head and the inner diameter of the cylinder after installation is 2.2mm.

[0047] Such as image 3 As shown, the top surface of the head of the piston is provided with a pit-shaped top combustion chamber 11, and the cross-section of the pit is in a shape simila...

Embodiment 2

[0054] The structure of this embodiment is the same as that of Embodiment 1 except that the dimensions are slightly changed.

[0055] The total height of the piston is 112.6mm, the height of the fire bank is 13.9mm, the height of the second ring bank is 9.9mm, and the height of the third ring bank is 5.4mm.

[0056] The rounded chamfer at the junction of the side wall of the top combustion chamber 11 and the top surface of the piston is R0.95mm, and the inner arc of R1.2mm is at a position above 2.05mm vertically downward from the top surface of the piston. The position below 2.05mm is a convex arc of R2.2mm. The inner arc with a radius of R1.2mm is connected to the outer convex arc with a radius of R2.2mm by a downwardly inclined tangent line forming an angle of 15°30' with the horizontal line.

[0057] The diameter of the skirt changes from 109.85mm at the 0mm position at the lower end of the skirt to 109.017mm at 48mm upward from the 0mm position at the lower end of the sk...

Embodiment 3

[0061] The structure of this embodiment is the same as that of Embodiment 1 except that the dimensions are slightly changed.

[0062] The total height of the piston is 112.8mm, the height of the fire power bank is 14.0mm, the height of the second ring bank is 10.1mm, and the height of the third ring bank is 5.6mm.

[0063] The rounded chamfer at the intersection of the side wall of the top combustion chamber 11 and the top surface of the piston is R0.55mm, and the position above 1.95mm vertically downward from the top surface of the piston is an inner arc of R0.8mm, vertically downward from the top surface of the piston The position below 1.95mm is a convex arc of R1.8mm. The inner arc with a radius of R0.8mm is connected to the outer convex arc with a radius of R1.8mm by a downwardly inclined tangent line forming an angle of 14°30' with the horizontal line.

[0064]The diameter of the skirt changes from 109.83 mm at the 0mm position to 109.015mm at the 48mm upward position f...

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Abstract

The invention discloses a pressurizing oil-saving type piston of a diesel engine, which comprises a piston pin boss, a skirt portion and a head portion, wherein the head portion is composed of a piston top end and a ring groove, the ratio of the total height of the piston to the cylinder diameter is from 1.024 to 1.028, the ratio of the height of a piston junk to the cylinder diameter is from 12.6% to 12.8%, and the largest point gap between the head portion of the piston and the inner diameter of the cylinder is 2.2mm. A top end combustion chamber in a shape of a w-shaped pit is arranged at the head portion of the piston, a cooling oil cavity composed of a cooling oil channel, an oil inlet hole and an oil outlet hole is arranged in the head portion of the piston below the top end combustion chamber, and the oil inlet hole and the oil outlet hole are located at two ends of the cooling oil channel and communicated with a cavity inside the piston. The skirt portion is a variable elliptic type surface with the middle portion protruding outwards and both the ellipticity and the diameter variable. The pressurizing oil-saving type piston of the diesel engine can reduce inertia force of reciprocating movement, friction contact area and invalid friction work loss and can reduce clearance of cylinder matching by means of optimizing piston structure, and achieve the purposes of improving valid power and reducing consumption of fuel oil and lubricating oil and environment pollution.

Description

technical field [0001] The invention relates to a piston, in particular to a piston for an Fengshen 4H supercharged fuel-saving diesel engine with a working cylinder diameter of 110 mm, a number of cylinders of 4 cylinders and a displacement of 4.75 L. Background technique [0002] The piston is one of the most critical parts in the engine and is the "heart" of the diesel engine. It converts the high explosion pressure generated by the combustion of fuel in high-pressure air into power and transmits it to the crankshaft to do work. [0003] Generally, pistons are approximately cylindrical. According to the working conditions and requirements of different engines, the structure of the piston itself is various. However, generally speaking, the piston is divided into three parts: the head, the skirt and the piston pin seat. [0004] The head refers to the top of the piston and the ring groove part. The top of the piston depends entirely on the requirements of the combustion ch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F02F3/00F02F3/26F02F3/16F02F3/10
Inventor 王季明刘献丰李树林魏情
Owner 石家庄金刚内燃机零部件集团有限公司
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