CN217380736U

CN217380736U - Low air leakage micro-nose conical surface cast iron piston ring

Info

Publication number: CN217380736U
Application number: CN202221073782.8U
Authority: CN
Inventors: 邱营贵; 张大圣
Original assignee: HUAMIN NANPING AUTOMOBILE FITTINGS GROUP CO Ltd
Current assignee: HUAMIN NANPING AUTOMOBILE FITTINGS GROUP CO Ltd
Priority date: 2022-05-07
Filing date: 2022-05-07
Publication date: 2022-09-06
Anticipated expiration: 2032-05-07

Abstract

The utility model relates to a little nose shape conical surface cast iron piston ring of low air leakage is applied to and installs on two ring grooves of piston, plays supplementary seal and frizing effect. The low air leakage micro-nose-shaped conical surface cast iron piston ring comprises a free opening conical surface ring body, wherein the lower end surface of the free opening conical surface ring body is provided with a rotary cutting micro-nose-shaped groove and a rotary cutting cylinder annular space; it is characterized in that homogeneous cylinder rings are arranged in the annular space of the rotary cutting cylinder; the homogeneous cylindrical ring and the free opening conical ring are integrally connected, and the lower end surfaces of the homogeneous cylindrical ring and the free opening conical ring are flush; the rotary cutting micro-nose-shaped groove is positioned on the lower end surfaces of the two. The abrasion speed of the ring is slowed down in the reciprocating motion of the piston, so that the ring can keep an initial high-elasticity state for a long time, and gas leaked by the ring is effectively prevented from passing through the contact surface again; the gas leaked by one piston ring passes through the closed gap and meets the resistance of the partial pressure of the gas-liquid two-phase engine oil in the small space, and the gas leakage is reduced.

Description

Low air leakage micro-nose conical surface cast iron piston ring

Technical Field

The utility model relates to a little nose shape conical surface cast iron piston ring of low air leakage is applied to and installs on two ring grooves of piston, plays supplementary seal and frizing effect.

Background

Automobile engines are now developing towards high power, high torque, low fuel consumption and long life. The piston ring as the most important core moving part of the engine has higher performance requirement. The piston ring has the main sealing function of an air ring which can be divided into a first air ring and a second air ring. Wherein, the two gas rings play the roles of auxiliary sealing and oil scraping.

The two gas rings on the high-power and high-torque engine adopt the national standard' internal combustion engine piston ring part 6: cast iron scraper ring (GB/T1149.6-2008/ISO 6623: 2004)4.3.1 conical nose ring (undercut platform) structure. The structure is a free-opening conical ring body, the outer edge of the lower end surface of the free-opening conical ring body is a rotary cutting cylinder annular space, and a rotary cutting cross section table is provided with a rotary cutting micro-nose-shaped groove. The rotary-cut cylinder annular space and the rotary-cut micro-nose-shaped groove are used as oil storage tanks in oil scraping and are used for accumulating or collecting scraped liquid engine oil. Bench experiments show that the air leakage generated by the two air rings when the rotating speed of the engine is higher than 2000 revolutions per minute is basically more than 57L/min on average, and the air leakage is relatively large.

Disclosure of Invention

The utility model aims to solve the technical problem that a little nose shape conical surface cast iron piston ring of low air leakage that effectively reduces air leakage is provided, and it is installed and is used as two gas rings on high-power, high torque engine.

The technical scheme of the utility model is that: (a) the low air leakage micro-nose-shaped conical surface cast iron piston ring comprises a free opening conical surface ring body, wherein the lower end surface of the free opening conical surface ring body is provided with a rotary cutting micro-nose-shaped groove and a rotary cutting cylinder annular space; it is characterized in that homogeneous cylinder rings are arranged in the annular space of the rotary cutting cylinder; the homogeneous cylindrical ring and the free opening conical ring are integrally connected, and the lower end surfaces of the homogeneous cylindrical ring and the free opening conical ring are flush; the rotary cutting micro-nose-shaped groove is positioned on the lower end surfaces of the two.

(b) a the low air leakage micro-nose cone cast iron piston ring is characterized in that the radial distance between the nearest point of the rotary cutting micro-nose groove and the outer side surface of the homogeneous cylinder ring is 0.1 mm.

Compared with the prior art, the utility model has the following advantages:

1. because the outer side surface of the homogeneous cylinder ring is a cylindrical surface and is arranged in the two annular grooves of the piston and uses the contact with the cylinder wall as surface contact, the abrasion speed of the ring is slowed down in the reciprocating motion of the piston, the ring can keep an initial high-elasticity state for a long time, and the gas leaked by the ring is effectively prevented from passing through the contact surfaces again.

2. The annular space of the rotary cutting cylinder is filled with homogeneous cylinder rings, so that the storage space of engine oil scraped from the wall of the cylinder is reduced, gas leaked by one piston ring penetrates through the closed gap and meets the resistance of partial pressure of gas-liquid two-phase engine oil in the small space, and the air leakage is reduced.

Drawings

FIG. 1 is a schematic cross-sectional view of a conventional tapered nose ring.

In the figure, 1 is a conical surface, 3 is a rotary-cut micro-nose-shaped groove, and 5 is a rotary-cut cylinder annular space.

Fig. 2 is a schematic cross-sectional structure of the present invention.

In the figure, 1 is a tapered surface, and 7 is a figure enlarged region.

Fig. 3 is a schematic diagram of the enlarged structure of the graph in the graph enlargement area in fig. 2.

In the figure, 1 is a conical surface, 7 is the outer side surface of a homogeneous cylinder ring, 9 is the nearest point of a rotary-cut micro-nose-shaped groove, 11 is the homogeneous cylinder ring, and 3 is the rotary-cut micro-nose-shaped groove.

Fig. 4 is a schematic structural view of the present invention installed on the piston in the cylinder.

In the figure, 13 is a piston, 15 is a cylinder wall, 17 is a piston ring, 19 is the present invention, and 21 is a combined oil ring.

Detailed Description

The low air leakage micro-nose-shaped conical surface cast iron piston ring comprises a free opening conical surface ring body, wherein the lower end surface of the free opening conical surface ring body is provided with a rotary cutting micro-nose-shaped groove (3) and a rotary cutting cylinder annular space (5). The utility model has the improvement that homogeneous cylinder rings (11) are arranged in the annular space of the rotary cutting cylinder, the homogeneous cylinder rings are connected with the free opening conical surface rings in an integrated way, and the two rings are parallel and level with each other at the lower end surface. The term "ring" is understood to mean a closed free opening. The material of the 'homogeneous cylindrical ring' is the same as that of the free opening conical ring body, and the 'homogeneous cylindrical ring' is integrally connected with the free opening conical ring body, so that the 'homogeneous cylindrical ring' can be cast by using the same pair of female dies in a casting process together with the free opening conical ring body during manufacturing, and the shape of a cavity of each female die can be changed. The outer side surface of the homogeneous cylindrical ring is a cylindrical surface and is not a conical surface. Therefore, the bus of the homogeneous column ring is not the extension of the free opening conical ring bus, the bus starting end of the homogeneous column ring is connected with the tail end of the free opening conical ring bus, and then the direction of the bus starting end is changed to be vertical to the lower end face. The "lower end face" refers to the end face of the end mounted on the piston, remote from the combustion chamber. The outer side surface of the homogeneous cylinder ring is used for contacting with the cylinder wall in work, the existing line contact of the conical surface is changed into surface contact, the line seal is changed into surface seal on the performance of sealing air leakage, and the sealing performance is naturally improved. The surface contact also enhances wear resistance of the ring during reciprocation within the cylinder, maintaining stability of the ring with the cylinder wall with the initial design spring force. The rotary cutting micro-nose-shaped groove (3) is positioned on the lower end surfaces of the two. The rotary cutting micro-nose-shaped groove (3) is an annular groove and is used for storing engine oil scraped from the cylinder wall. The position of the rotary-cut micro-nose-shaped groove (3) in the lower end surface can be that the radial distance between the closest point (9) of the rotary-cut micro-nose-shaped groove and the outer side surface of the homogeneous cylinder ring is between 0 mm and the maximum value. The radial distance between the closest point (9) of the rotary cutting micro-nose-shaped groove and the outer side surface of the homogeneous cylinder ring is 0.1 mm, so that the contact surface is endowed with a certain thickness, meanwhile, a 90-degree corner is formed between the lower end surface and the cylinder wall, a small amount of engine oil is adsorbed at the corner, the contact surface is convenient to lubricate and does not enter the rotary cutting micro-nose-shaped groove (3), and the adsorbed engine oil is small in amount, so that the engine oil is favorably and uniformly distributed between the contact surfaces, and the resistance of high-pressure airflow passing through the rotary cutting micro-nose-shaped groove is increased.

The utility model (19) is installed on the piston (13) to be used as a secondary piston ring. The high-pressure airflow from the combustion chamber pushes the piston to do work, and simultaneously, a small amount of gas flow passes through one piston ring (17) to reach the upper end surface of the two piston rings; then, the lower end face of the two piston rings is reached through two ways. One approach is between the contact surfaces of the two piston rings and the cylinder wall. Another approach is a gap closed by a free opening of the two piston rings. After the line contact between the two piston rings and the cylinder wall is improved into the surface contact, and the oil is distributed between the surface contacts, the resistance of high-pressure air flow passing through is increased. The gas flow that tries to pass through the free opening closing slit path is also resisted by the further reduced space between the lower end surface and the annular groove of the piston. Both approaches increase resistance to air leakage and greatly reduce air leakage.

Claims

1. The low air leakage micro-nose-shaped conical surface cast iron piston ring comprises a free opening conical surface ring body, wherein the lower end surface of the free opening conical surface ring body is provided with a rotary cutting micro-nose-shaped groove (3) and a rotary cutting cylinder annular space (5); it is characterized in that a homogeneous cylinder ring (11) is arranged in the annular space of the rotary cutting cylinder; the homogeneous cylindrical ring and the free opening conical ring are integrally connected, and the lower end surfaces of the homogeneous cylindrical ring and the free opening conical ring are flush; the rotary cutting micro-nose-shaped groove (3) is positioned on the lower end surfaces of the two.

2. The low air leakage micro-nose cone cast iron piston ring as claimed in claim 1, wherein the radial distance between the closest point (9) of the rotary-cut micro-nose groove and the outer side surface of the homogeneous cylinder ring is 0.1 mm.