KR20160128068A - Piston for internal combustion engine - Google Patents

Piston for internal combustion engine Download PDF

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Publication number
KR20160128068A
KR20160128068A KR1020150059820A KR20150059820A KR20160128068A KR 20160128068 A KR20160128068 A KR 20160128068A KR 1020150059820 A KR1020150059820 A KR 1020150059820A KR 20150059820 A KR20150059820 A KR 20150059820A KR 20160128068 A KR20160128068 A KR 20160128068A
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KR
South Korea
Prior art keywords
piston
piston pin
pin boss
respect
rib portion
Prior art date
Application number
KR1020150059820A
Other languages
Korean (ko)
Inventor
양준규
류관호
남현우
전상혁
유인철
Original Assignee
동양피스톤 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 동양피스톤 주식회사 filed Critical 동양피스톤 주식회사
Priority to KR1020150059820A priority Critical patent/KR20160128068A/en
Publication of KR20160128068A publication Critical patent/KR20160128068A/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F3/0076—Pistons  the inside of the pistons being provided with ribs or fins
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J1/00—Pistons; Trunk pistons; Plungers
    • F16J1/001—One-piece pistons
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
    • F02F3/00—Pistons 
    • F02F2003/0007—Monolithic pistons; One piece constructions; Casting of pistons

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston for an internal combustion engine that reciprocates in a cylinder of an internal combustion engine and receives power of explosion at high temperature and high pressure in a combustion stroke and transmits power to a crankshaft through a connecting rod. A piston pin boss portion formed on the body to support the piston pin on the body; A first rib portion extending from the piston pin boss portion to one side of the body; And a second rib portion extending from the piston pin boss portion toward the other side of the body, wherein the first rib portion is inclined at a first angle with respect to a reference plane perpendicular to the longitudinal direction of the piston pin, Outboard side portion; And an inner side portion inclined at a second angle with respect to the outer side portion.

Description

[0001] The present invention relates to a piston for internal combustion engine,

More particularly, the present invention relates to a piston for an internal combustion engine that reciprocates in a cylinder of an internal combustion engine and receives a high-temperature, high-pressure explosion pressure in a combustion stroke to transmit power to a crankshaft through a connecting rod .

In general, the piston for the internal combustion engine is designed considering the influence of the load applied to the piston, and is manufactured in various ways depending on the shape, structure, material, and the like. For example, a full-skit piston having a high mechanical strength is used for an engine having a severe operating condition, and a slipper piston, which is a piston having a part of a skirt portion removed, is used for an engine requiring a high rotation speed. The slipper piston can increase the rotational speed of the engine as the weight of the piston decreases, reduce the contact area with the cylinder wall, reduce the frictional force, and lessen the interference with the counterweight of the crankshaft when the piston is lowered The piston stroke can be made longer.

However, the conventional slipper piston has a weak skirt strength compared to the full skirt piston, and cracks may occur at the lower end of the skirt when the stress acting on the lower end of the skirt is increased during piston operation. Such a crack lowers the reliability of the entire piston there was. In order to prevent such a problem, a method of designing a pressure side skirt portion in which more stress is generated is designed to be thicker than a skirt portion in back pressure side is used, but there is a problem that cracks are generated in the piston due to insufficient stiffness.

Disclosure of Invention Technical Problem [8] Accordingly, the present invention has been made to solve the above-mentioned problems, and it is an object of the present invention to provide a skirt portion having a slope to reinforce rigidity of a piston, And it is an object of the present invention to provide a piston for an internal combustion engine capable of reducing a friction loss. However, these problems are exemplary and do not limit the scope of the present invention.

According to one aspect of the present invention, there is provided a piston for an internal combustion engine. The piston for an internal combustion engine includes: a body; A piston pin boss portion formed on the body to support the piston pin on the body; A first rib portion extending from the piston pin boss portion to one side of the body; And a second rib portion extending from the piston pin boss portion toward the other side of the body, wherein the first rib portion is inclined at a first angle with respect to a reference plane perpendicular to the longitudinal direction of the piston pin, Outboard side portion; And an inner side portion inclined at a second angle with respect to the outer side portion.

In the piston for the internal combustion engine, the second rib may include an outer side portion inclined at a third angle with respect to a reference plane perpendicular to the longitudinal direction of the piston pin.

In the piston for the internal combustion engine, the first angle may be 3 degrees to 10 degrees, the second angle may be 2 degrees to 8 degrees, and the third angle may be 5 degrees to 12 degrees.

In the piston for the internal combustion engine, the first rib portion may be a pressure side, the second rib portion may be a back pressure side, and the third angle may be larger than the first angle.

A first skirt wall portion formed on a pressure side of the body and having a first cross-sectional area with respect to the piston pin boss portion in the piston for the internal combustion engine; And a second skirt wall portion formed on the back pressure side of the body opposite to the first skirt wall portion and having a second cross-sectional area with respect to the piston pin boss portion, wherein the first area is larger than the second area It could be wider.

In the internal combustion engine piston, the first rib portion and the second rib portion may be arcuate in vertical cross section with respect to the piston pin boss portion.

In the piston for the internal combustion engine, the first rib portion may have an outer surface of a convex shape having a rounded longitudinal section with respect to the piston pin boss portion, and an inner surface of a round concave shape.

In the piston for the internal combustion engine, the first rib portion may have an outer surface of a linear shape in longitudinal section with respect to the piston pin boss portion and an inner surface of a round concave shape.

In the piston for an internal combustion engine, the first rib portion may have a convex outer surface with a rounded longitudinal section with respect to the piston pin boss portion, and may have a straight inner surface.

Wherein the first rib portion has a third cross sectional area with respect to the piston pin boss portion and the second rib portion has a fourth cross sectional area with respect to the piston pin boss portion, May be wider than the fourth area.

According to one embodiment of the present invention as described above, a rib having a slope is formed to reinforce the rigidity of the piston, the piston is prevented from cracking to improve reliability, and the skirt portion with a small area is provided, The present invention has the effect of realizing a piston for an internal combustion engine. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view showing a piston for an internal combustion engine according to an embodiment of the present invention.
2 is a bottom perspective view showing the piston for the internal combustion engine of Fig. 1;
3 is a bottom view of the piston for the internal combustion engine of Fig. 1;
Fig. 4 is a cross-sectional view showing a cross section taken along the line I-I of the piston for the internal combustion engine of Fig. 3;
5 is a sectional view showing a piston for an internal combustion engine according to another embodiment of the present invention.
6 is a cross-sectional view showing a piston for an internal combustion engine according to another embodiment of the present invention.
7A is a stress distribution diagram showing a result of stress transfer simulation of a conventional piston for an internal combustion engine.
7B is a stress distribution diagram showing a result of stress transfer simulation of a piston for an internal combustion engine according to an experimental example of the present invention.
8A is a photograph showing a skirt rib crack in a conventional piston for an internal combustion engine.
8B is a photograph of a piston for an internal combustion engine according to an experimental example of the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are described in order to more fully explain the present invention to those skilled in the art, and the following embodiments may be modified in various other forms, The present invention is not limited to the embodiment. Rather, these embodiments are provided so that this disclosure will be more thorough and complete, and will fully convey the concept of the invention to those skilled in the art. In the drawings, the thickness and size of each layer are exaggerated for convenience and clarity of explanation.

The piston for the internal combustion engine referred to in the present invention performs a linear reciprocating motion in the cylinder to generate a rotational force on the crankshaft through the connecting rod and a power received from the gas of high temperature and pressure in the explosion stroke, It can act by receiving force from the crankshaft.

FIG. 1 is a perspective view showing a piston 100 for an internal combustion engine according to an embodiment of the present invention, FIG. 2 is a rear perspective view showing a piston 100 for an internal combustion engine of FIG. 1, and FIG. 3 is a cross- 100).

1 to 3, a piston 100 for an internal combustion engine according to an embodiment of the present invention includes a body 10, a piston pin boss portion 20, a first rib portion 30, A first skirt wall portion 50, and a second skirt wall portion 60. The first skirt wall portion 50,

1 to 3, the piston pin boss portion 20 may be formed on the body 10 so as to support the piston pin on the body 10. The piston pin is a pin that connects the small end of the connecting rod of the piston pin boss portion 20 and transmits a large force received by the piston to the crankshaft through the connecting rod, It is possible to reciprocate.

3, the first rib portion 30 is formed so as to extend from the piston pin boss portion 20 in one direction of the body 10, that is, in the pressure side direction about the piston pin, The two rib portions 40 may extend from the piston pin boss portion 20 in the other direction of the body 10, that is, in the direction of the back pressure side with respect to the piston pin. At this time, the first rib portion 30 and the second rib portion 40 quickly transmit the heat of the piston head portion to the ring portion or the skirt portion, and can particularly play a role of reinforcing the piston.

For example, the first rib portion 30 and the second rib portion 40 are formed to extend from the piston pin boss portion 20 to the piston skirt portion so as to support the skirt portion, and the piston pin boss portion 20 Since the skirt portion is supported in a direction having a tilt rather than an orthogonal direction, the rigidity of the piston is reinforced by serving to disperse the side pressure.

3, the cross-sectional surface of the first rib portion 30 has an outer side surface portion having a slope downward at a first angle A1 with respect to a plane L perpendicular to the longitudinal direction of the piston pin And an inner side portion 30b having a slope downward to a second angle A2 with respect to the first angle A1 of the outer side surface portion 30a. The second rib portion 40 may include an outer side portion 40a having a slope downward at a third angle A3 with respect to a plane L perpendicular to the longitudinal direction of the piston pin. The third angle A3 is between 5 degrees and 12 degrees and the third angle A3 is between 3 degrees and 8 degrees; the second angle A2 is between 2 degrees and 5 degrees; the third angle A3 is between 5 degrees and 12 degrees; Is greater than one angle (A1).

Therefore, the first rib portion 30 can support the piston pin boss portion 20 in an inclined manner with respect to the direction in which the pressure or back pressure of the internal combustion engine piston 100 acts, The pressure can be distributed not only in the inclined direction but also in the vicinity of the body 10 because cracks can be prevented from being generated.

The first skirt wall portion 50 preferably has a length in the longitudinal direction of the cross-section with respect to the piston pin boss portion 20 being 40 to 60 percent of the diameter of the piston 100 for the internal combustion engine. These slope values and the longitudinal length values of the cross section are the values shown in the experimental examples in which the maximum stress value at the lower end of the skirt is small based on the result of the stress transfer simulation obtained through the experimentally repeated simulation.

The first skirt wall portion 50 is formed on the pressure side of the body 10 and has a first cross-sectional area with respect to the piston pin boss portion 20. The second skirt wall portion 60 has a first cross- Pressure side of the body 10 facing the piston pin boss portion 50 and having a second cross-sectional area with respect to the piston pin boss portion 20. [ At this time, the first area is formed larger than the two areas.

For example, as shown in FIG. 3, the first thickness t1 of the first skirt wall portion 50, which is formed on the side of the pressure receiving the pressure strongly during the reciprocating movement of the piston, Is designed to be thicker than the second thickness (t2) of the second skirt wall portion (60) formed on the back pressure side, a more rigid piston is realized.

In the case of the piston, pressure is alternately applied to the side wall of the cylinder during up and down movement, and a thrust acts on the piston and the skirt portion. The side pressure is due to the piston hitting the cylinder wall while not tilting up and down vertically but tilting toward the cylinder wall, resulting in side pressure and noise. The portion where the side pressure acts strongly is the pressure side, and the portion that acts relatively small corresponds to the back pressure side.

Accordingly, the piston 100 for an internal combustion engine according to an embodiment of the present invention enhances the stiffness on the pressure side, secures only the necessary stiffness on the back pressure side, reduces the skirt area, and reduces the frictional loss economically .

Fig. 4 is a cross-sectional view showing a cross section taken along the line I-I of the piston for the internal combustion engine of Fig. 3;

As shown in FIG. 4, the first rib portion 30 and the second rib portion 40 are formed in an arcuate profile with respect to the piston pin boss portion 20. For example, the first rib portion 30 and the second rib portion 40 have convex outer surfaces 31 and 41 having a rounded longitudinal section with respect to the piston pin boss portion 20, Side surfaces 32 and 42, respectively.

4, the first rib portion 30 has a third surface area in a longitudinal section with respect to the piston pin boss portion 20, and the second rib portion 40 has a piston pin boss portion 20 ), And the third area is wider than the fourth area.

For example, the first rib portion 30 has a third thickness t3 on the vertical plane with respect to the piston pin boss portion 20, and the second rib portion 40 has a vertical thickness t2 on the basis of the piston pin boss portion 20, Has a fourth thickness t4, and the third thickness t3 is preferably larger than the fourth thickness t4.

As described above, the pistons 100, 200, and 300 for the internal combustion engine according to the embodiment of the present invention are configured such that the first rib portion 30 and the second rib portion 40 have the shape of an inner mold support portion having an arch- The first rib portion 30 is designed to be thicker than the second rib portion 40 to further secure the rigidity of the piston.

5 is a sectional view showing a piston 200 for an internal combustion engine according to another embodiment of the present invention.

5, the first rib portion 30 and the second rib portion 40 have outer side surfaces 33 and 43 having a straight longitudinal section with respect to the piston pin boss portion 20, And may have a rounded concave inner surface 34 (44).

Therefore, the piston 200 for an internal combustion engine according to another embodiment of the present invention is formed in an arcuate inner side so as to be resistant to vertical pressure and formed of a straight line having an inclined outer surface, It is possible to realize a piston having a high durability.

6 is a cross-sectional view showing a piston 300 for an internal combustion engine according to another embodiment of the present invention.

6, the first rib portion 30 and the second rib portion 40 have convex outer surfaces 35 and 45 having a rounded vertical section with respect to the piston pin boss portion 20 , And a straight inner side surface (36) (46).

Accordingly, the piston 300 for an internal combustion engine according to another embodiment of the present invention is formed by a straight line having an inclination on the inner side and is resistant to horizontal pressure and has an outer side formed in an arcuate shape, It is possible to realize a piston having a high durability.

Therefore, the pistons 100, 200, 300 for the internal combustion engine according to the embodiment of the present invention prevent the piston from cracking and provide the skirt portion with a small area, thereby reducing the friction loss and improving the reliability of the internal combustion engine A piston can be realized.

Hereinafter, in order to facilitate understanding of the present invention, an example of an analysis experiment to which the above-described technical idea is applied will be described. It should be noted that the following analysis examples are only for the purpose of helping understanding the present invention, and the present invention is not limited by the following analysis examples.

[Analysis Experimental Example]

In the present embodiment, the first rib portion is formed by an outer side portion having a slope downward by 8 degrees with respect to a plane perpendicular to the longitudinal direction of the piston pin, and an inner side portion having a slope downward by 5 degrees with respect to the outer side portion, A piston formed by a side portion having a slope downward by 10 degrees with respect to a plane perpendicular to the longitudinal direction of the piston pin.

An engine durability test was conducted for 500 hours using the piston, and maximum output and maximum explosion pressure were applied. That is, the durability test was performed by allowing the maximum temperature and the maximum lateral pressure to be applied to the piston.

FIG. 7A is a stress distribution diagram showing a result of stress transfer simulation of a conventional internal combustion engine piston, and FIG. 7B is a stress distribution diagram showing a result of stress transfer simulation of a piston for an internal combustion engine according to an experimental example of the present invention.

For example, as shown in FIGS. 7A and 7B, when a conventional piston having a tilt angle of 0 degree is subjected to stress transfer simulation, it is confirmed that the maximum stress appears at 267.1 MPa at the lower end of the skirt portion. In the experimental example of the present invention It was confirmed that the maximum stress of the piston was 150.3 MPa.

Therefore, it can be confirmed that it is possible to realize a piston with 44% higher rigidity than the conventional piston.

Fig. 8A is a photograph of a piston for a conventional internal combustion engine showing a skirt rib crack (C), and Fig. 8B is a photograph of a piston for an internal combustion engine according to an experimental example of the present invention.

8A to 8B are photographs showing the result after the piston is subjected to the 500-hour engine durability test. In the conventional piston in which the inclination angle of the rib portion is 0 degree, a crack C is generated in the skirt rib portion, And it can be confirmed that the piston according to the experimental example of the present invention does not crack.

Therefore, as shown in FIGS. 8A to 8B, the piston of the experimental example designed to have the slope of the cross section of the rib portion has an improved rigidity as compared with the conventional piston, so that it is possible to realize a piston with high durability.

While the present invention has been described with reference to exemplary embodiments, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Body
20: Piston pin boss portion
30: first rib portion
30a:
30b: inner side portion
40: second rib portion
40a:
50: first skirt wall portion
60: second skirt wall portion

Claims (10)

Body;
A piston pin boss portion formed on the body to support the piston pin on the body;
A first rib portion extending from the piston pin boss portion to one side of the body; And
And a second rib portion extending from the piston pin boss portion toward the other side of the body,
Wherein the first rib portion
An outer side surface inclined at a first angle with respect to a reference plane perpendicular to the longitudinal direction of the piston pin; And
And an inner side surface inclined at a second angle with respect to the outer side surface portion. The method according to claim 1,
The second rib portion
And an outer side surface inclined at a third angle with respect to a reference plane perpendicular to the longitudinal direction of the piston pin. 3. The method of claim 2,
Wherein the first angle is from 3 degrees to 10 degrees,
The second angle is between 2 degrees and 8 degrees,
And the third angle is 5 to 12 degrees. The method of claim 3,
Wherein the first rib portion is on the pressure side and the second rib portion is on the back pressure side,
And the third angle is greater than the first angle. The method according to claim 1,
A first skirt wall portion formed on the pressure side of the body and having a first cross-sectional area based on the piston pin boss portion; And
And a second skirt wall portion formed on the back pressure side of the body opposite to the first skirt wall portion and having a second cross-sectional area based on the piston pin boss portion,
Wherein the first area is wider than the second area. The method according to claim 1,
Wherein the first rib portion and the second rib portion are arcuate in vertical cross section with respect to the piston pin boss portion. The method according to claim 1,
Wherein the first rib portion has an outer surface of a convex shape whose longitudinal section is rounded with respect to the piston pin boss portion, and has an inner surface of a round concave shape. The method according to claim 1,
Wherein the first rib portion has an outer surface of which a longitudinal section is linear with respect to the piston pin boss portion, and has an inner surface of a round concave shape. The method according to claim 1,
Wherein the first rib portion has an outer surface of a convex shape whose longitudinal section is rounded with respect to the piston pin boss portion and has a straight inner surface. The method according to claim 1,
Wherein the first rib portion has a third surface area in the longitudinal direction with respect to the piston pin boss portion,
Wherein the second rib portion has a fourth surface area in the longitudinal direction with respect to the piston pin boss portion,
And the third area is wider than the fourth area.
KR1020150059820A 2015-04-28 2015-04-28 Piston for internal combustion engine KR20160128068A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111287937A (en) * 2018-12-07 2020-06-16 安徽美芝制冷设备有限公司 Piston and manufacturing method thereof, compressor and refrigeration equipment

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111287937A (en) * 2018-12-07 2020-06-16 安徽美芝制冷设备有限公司 Piston and manufacturing method thereof, compressor and refrigeration equipment

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