KR101730820B1 - Piston for internal combustion engine and manufacturing method of piston using the same - Google Patents

Piston for internal combustion engine and manufacturing method of piston using the same Download PDF

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Publication number
KR101730820B1
KR101730820B1 KR1020150059822A KR20150059822A KR101730820B1 KR 101730820 B1 KR101730820 B1 KR 101730820B1 KR 1020150059822 A KR1020150059822 A KR 1020150059822A KR 20150059822 A KR20150059822 A KR 20150059822A KR 101730820 B1 KR101730820 B1 KR 101730820B1
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KR
South Korea
Prior art keywords
piston
cooling channel
protrusion
friction welding
internal combustion
Prior art date
Application number
KR1020150059822A
Other languages
Korean (ko)
Other versions
KR20160128070A (en
Inventor
양준규
류관호
이정근
선주현
전상혁
박상빈
지정훈
이홍익
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.)
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Priority to KR1020150059822A priority Critical patent/KR101730820B1/en
Publication of KR20160128070A publication Critical patent/KR20160128070A/en
Application granted granted Critical
Publication of KR101730820B1 publication Critical patent/KR101730820B1/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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
    • B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
    • 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 
    • F02F3/16—Pistons  having cooling means
    • 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 
    • F02F3/28—Other pistons with specially-shaped head
    • 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 
    • F02F3/0015—Multi-part pistons
    • F02F3/003—Multi-part pistons the parts being connected by casting, brazing, welding or clamping
    • F02F2003/0061—Multi-part pistons the parts being connected by casting, brazing, welding or clamping by welding

Abstract

The present invention relates to a piston for an internal combustion engine, in which a cooling channel free of flash is formed, thereby improving reliability, and a method of manufacturing the piston, comprising: a first member in which a part of a cooling channel is formed; A second member on which another portion of the cooling channel is formed; And a friction welding protrusion formed on the second member so that the first member and the second member can be engaged and can be melted and filled in the form of wrapping at least a part of the first member by a friction tool .

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a piston for an internal combustion engine,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a piston for an internal combustion engine and, more particularly, to a piston for an internal combustion engine which reciprocates in a cylinder of an internal combustion engine and receives explosion pressure of high temperature and high pressure in a combustion stroke, And a method of manufacturing the same.

2. Description of the Related Art Generally, an automobile is an internal combustion engine (hereinafter referred to as " engine ") equipped with a cylinder for compressing a mixture of fuel and air and combusting the same by burning gasoline, diesel, liquefied natural gas, etc. and using the explosive force to rotate the crankshaft. Quot;).

Here, the engine includes a cylinder block having a plurality of cylinders formed therein, a cylinder head provided at an upper portion of the cylinder block to provide a combustion chamber, and a cylinder head which is mounted in the cylinder and performs a reciprocating motion to / And a piston for receiving the generated high-temperature and high-pressure gas pressure to transmit the power to the crankshaft through the connecting rod.

A cooling channel for cooling the piston is formed in the piston to prevent the piston from being deteriorated by thermal fatigue stress during engine operation. Since the cooling channel has to be annularly formed in the middle portion of the piston, the crown portion and the skirt portion of the piston, in which the cooling channel is usually formed, are manufactured and then joined together by friction welding to form the cooling channel.

However, in the conventional piston joining technique, a flash is generated in a portion where the crown portion and the skirt portion are joined at the time of friction welding, thereby narrowing the space of the cooling channel, which makes it difficult to move the cooling fluid.

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 cooling channel free of flash, And an object of the present invention is to provide an improved piston for an internal combustion engine and a method of manufacturing the same. 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 internal combustion engine piston includes: a first member in which a part of the cooling channel is formed; A second member on which another portion of the cooling channel is formed; And a friction welding protrusion formed on the second member so that the first member and the second member can be engaged and can be melted and filled in the form of wrapping at least a part of the first member by a friction tool .

In the internal combustion engine piston, the first member may include at least a portion of the piston crown portion, and the second member may include at least a portion of the piston skirt portion.

In the piston for the internal combustion engine, the first member is formed with a receiving portion capable of receiving a hardened portion of the friction welding protrusion on one side thereof, the receiving portion including: a neck portion to which the friction welding protrusion is fitted; And a widening portion in which the friction welding protrusion is melted and filled, the neck portion having a first width, the widening portion having a second width, and the second width being larger than the first width .

In the piston for an internal combustion engine, the friction welding protrusions may include: a frictional portion formed on the neck; And a fused portion melted by the friction tool and formed in the wider portion.

In the piston for an internal combustion engine, the first member is a ring-shaped insertion member in which a part of a cooling channel is formed downward, and the friction welding protrusion has: an inner protrusion having a first radius; And an outer protrusion having a second radius larger than the first radius.

In the piston for an internal combustion engine, the first member may further include a combustion chamber portion formed on an upper surface thereof.

According to another aspect of the present invention, there is provided a piston manufacturing method. The piston manufacturing method includes the steps of: preparing a first member in which a part of a cooling channel is formed; Preparing a second member in which another portion of the cooling channel is formed; Assembling the first member and the second member; Melting the friction welding protrusions formed on the second member such that the first member and the second member are engaged by wrapping at least a part of the first member with a friction tool; And cutting at least a portion of at least one of the first member, the second member, and the friction welding protrusions.

In the piston manufacturing method, the cutting step may be to form a ring groove on a side surface of the first member so that a ring capable of holding airtightness can be received when the first member is inserted into the cylinder.

In the piston manufacturing method, the cutting step may further include forming an upper surface or a combustion chamber part of the first member.

Wherein in the piston manufacturing method, the first member preparation step is to prepare a first member which is a ring-shaped insertion member in which a part of a cooling channel is formed downward, and the melting step includes: An inner protrusion melting step of melting an inner protrusion having a first radius and formed on the second member such that the inner protrusion is surrounded by at least a part of the first member by a friction tool so that the member can be engaged; And an outer protrusion melting step having an outer protrusion formed on the second member and having a second radius so that the first member and the second member can be engaged by being melted by a friction tool to cover at least a part of the first member ; ≪ / RTI >

In the piston manufacturing method, the inner protrusion melting step and the outer protrusion melting step may be simultaneously performed.

According to an embodiment of the present invention as described above, it is possible to form a cooling channel without a flash, to secure a space of the cooling channel to smooth the movement of the cooling fluid, And methods of making the same. Of course, the scope of the present invention is not limited by these effects.

1 is a sectional view showing a piston for an internal combustion engine according to an embodiment of the present invention.
2 is a sectional view showing a piston for an internal combustion engine according to another embodiment of the present invention.
3 is a cross-sectional view showing a piston for an internal combustion engine according to another embodiment of the present invention.
4 is a flowchart illustrating a method of manufacturing a piston according to an embodiment of the present invention.
Figs. 5 to 10 are cross-sectional views showing steps of the piston manufacturing method of Fig.
11 is a flowchart showing a method of manufacturing a piston according to another embodiment of the present invention.
12 is a flowchart showing a method of manufacturing a piston according to another embodiment of the present invention.
Figs. 13 to 19 are perspective views showing the piston manufacturing method of Fig. 12 step by step.

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 into various other forms, It 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.

1 is a cross-sectional view showing a piston 100 for an internal combustion engine according to an embodiment of the present invention.

1, a piston 100 for an internal combustion engine according to an embodiment of the present invention may include a first member 10, a second member 20, and a friction welding protrusion 30. As shown in Fig. For example, the first member 10 may be formed with a portion 11 of the cooling channel, and the second member 20 may be formed with the other portion 21 of the cooling channel.

In addition, the portion 11 of the cooling channel and the other portion 21 of the cooling channel may be joined together to form a cooling channel. The cooling channel may be located in the cooling channel to reduce the thermal fatigue stress of the piston. At this time, the friction welding protrusions 30 are formed on the second member 20 so that the first member 10 and the second member 20 can be engaged with each other, and the frictional welding protrusions 30 of the first member 10 And is melted and filled in the form of wrapping at least a part thereof.

The friction tool F is a device for melting the second member 20 by friction, and generates a frictional heat by rotating in a state in which the tip directly contacts the second member to melt the second member 20.

1, the piston 100 for an internal combustion engine can be divided into a crown portion C and a skirt portion S, and the first member 10 includes at least a portion of the piston crown portion C , The second member 20 may include at least a portion of the piston skirt portion S. The skirt portion S is formed with a piston pin boss portion 80 capable of supporting a piston pin. The piston pin is a pin connecting the small end of the connecting rod of the piston pin boss portion 20, The large force received by the piston can be transmitted to the crankshaft through the connecting rod and the piston can reciprocate at high speed in the cylinder.

1, the piston 100 for an internal combustion engine according to the embodiment of the present invention is formed by melting a friction welding protrusion 30 on one side of a first member 10 to receive a hardened portion 30b Can be formed. The accommodating portion includes a neck portion 12 and a friction welding protrusion 30 that are fitted with the friction welding protrusions 30 so as to be able to receive at least a portion of the fused portion 30a and the fused portion 30b of the friction welding protrusions 30. [ And the wider portion 14 is filled with molten material.

The neck portion 12 has a first width W1 and the wider portion 14 has a second width W2 and the second width W2 has a first width W1, . The friction welding protrusions 30 may be formed so that their thickness becomes thinner toward the upper side, and the thickness of the thickest lower side is preferably equal to or smaller than the thickness of the first width W1.

Therefore, at least a portion of the neck portion 12 is accommodated with the non-melted friction welding protrusion 30, and at least a portion of the wider portion 14 can be filled with the melted and hardened friction welding protrusion 30b. The molten and cured friction welding protrusions 30b are formed to extend from the first member 10 and can serve to join the first member 10 and the second member 20 together. The friction welding protrusion 30 may be made of the same material as that of the first member 10 or may be formed of a material that is hardened after the first member 10 is melted.

Therefore, the first member 10 and the second member 20 can be firmly coupled without a flash generated at the time of welding.

On the other hand, the remaining joint surfaces of the first member 10 and the second member 20 can be joined by simple butt contact. In addition, the joint surfaces between the first member 10 and the second member 20 can be joined by brazing welding for a more rigid fixation. In addition, the first member 10 and the second member 20 can be more firmly fixed by using various fasteners such as screws, bolts, rivets, and welding materials.

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

2, the piston 200 for an internal combustion engine includes a first member 10, a second member 20, a friction welding protrusion 30, a ring groove portion 40, and a combustion chamber portion 50 .

The first member 10, the second member 20 and the friction welding protrusions 30 are constituted by the components of the piston 100 for an internal combustion engine according to the embodiment of the present invention shown in FIG. 1, Can be the same. Therefore, detailed description is omitted.

The ring groove portion 40 is formed on the side surfaces of the first member 10 and the second member 20 and includes a first ring groove portion 40a and a second ring groove portion 40a for accommodating the top ring, 40b and the third ring groove portion 40c. The top ring serves to keep the piston hermetically with the inner wall of the cylinder to prevent the combustion gas from flowing out to the outside. Since the top ring may be directly influenced by the combustion gas, the first ring groove portion 40a, . The oil ring scrapes the oil remaining on the inner wall of the cylinder to prevent oil from entering the combustion chamber.

The combustion chamber portion 50 may be formed on the upper surface of the first member 10 and may be formed by cutting at least a portion of the friction welding protrusion 30. The combustion chamber portion 50 is formed in the piston crown portion C and can be formed in a structure capable of improving the engine output and reducing the generation of exhaust gas by increasing the utilization rate of the air introduced into the combustion chamber and the combustion efficiency.

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

3, the piston 300 for an internal combustion engine may include a first member 10, a second member 20, and a friction welding protrusion 30. As shown in Fig. The first member 10 is a ring-shaped insertion member in which a part 11 of the cooling channel is formed below and the friction welding protrusion 30 has an inner protrusion 32 having a first radius and an inner protrusion 32 having a first radius And an outer protruding portion 34 having a large second radius.

3, an inner protruding portion 32 is formed inside the piston crown portion C, and the inner protruding portion 32 includes an inner protruding portion 32a and a friction tool F, and then cured to form an inner protrusion molten portion 32b. The outer claw portion 34 is formed on the outer side of the piston crown portion C. The outer claw portion 34 is formed by melting the outer crown portion 34a which is not melted and the friction tool F, And a melted portion 34b.

Accordingly, the piston 300 for the internal combustion engine can be firmly engaged and engaged with the first member 10 and the second member 20 without a flash generated at the time of welding. Therefore, it is possible to realize a piston in which securing the space of the cooling channel is easy, the fluidity of the cooling medium is secured, and the reliability is improved.

FIG. 4 is a flowchart showing a method of manufacturing a piston according to an embodiment of the present invention, and FIGS. 5 to 10 are cross-sectional views showing steps of a method of manufacturing the piston of FIG.

4 to 10, a method of manufacturing a piston according to an embodiment of the present invention includes preparing a first member 10 in which a part 11 of a cooling channel is formed, (S12) of assembling the first member 10 and the second member 20 (S13); preparing the second member 20 in which the other member 21 of the first member 10 is formed Wherein the friction welding protrusion 30 formed on the second member 20 is melted in the form of wrapping at least a part of the first member 10 with the friction tool F so that the second member 20 can be engaged with the second member 20 (S14) cutting at least a part of at least one of the first member 10, the second member 20 and the friction welding protrusion 30 (S15). More specifically, the cutting step S15 includes the steps of forming a ring groove 40 on the side surface of the first member 10 so that a ring capable of maintaining airtightness can be received when the first member 10 is inserted into the cylinder S15-1).

6 to 7, the step (S13) of assembling the first member 10 and the second member 20 is performed such that the portion 11 of the cooling channel and the other portion 21 of the cooling channel It may be to assemble the first member 10 and the second member 20 so that they are joined to each other to form a cooling channel. At this time, the friction welding protrusion 30 can be fitted to the neck 12 of the receiving portion formed in the first member.

8, the fusing step S14 is performed while the friction tool F is in a state of being in direct contact with the friction welding protrusions 30 of the second member 20 to generate frictional heat, 20). 9, the friction welding protrusions 30 may be composed of the unmelted portion 30a and the molten portion 30b that melts in a manner to surround a portion of the second member 20, as shown in Fig. Of course, the friction welding protrusions 30 may be formed by melting all of them and wrapping a part of the second member 20.

Accordingly, the piston manufacturing method according to an embodiment of the present invention can firmly connect the first member 10 and the second member 20 without flashing occurring at the time of welding.

11 is a flowchart showing a method of manufacturing a piston according to another embodiment of the present invention.

11, the method for manufacturing a piston according to an embodiment of the present invention includes preparing the first member 10 (S21), preparing the second member 20 (S22), forming the first member 10 , A second member 20 assembling step S23, a friction welding protrusion 30 melting step S24, and a cutting step S25. Specifically, the cutting step S25 may include a ring groove portion forming step S25-1 and a surface machining or combustion chamber forming step S25-2.

Specifically, the step of machining or forming the combustion chamber 50 (S25-2) includes a step of machining the surface of the piston after the friction welding or a step of forming the combustion chamber 50 on the upper surface of the first member 10 . ≪ / RTI > The combustion chamber portion (50) is formed at one side of the piston crown portion (C).

Therefore, the utilization rate of the air introduced into the combustion chamber and the combustion efficiency can be increased, the engine output can be improved, and the generation of exhaust gas can be reduced.

FIG. 12 is a flowchart showing a method of manufacturing a piston according to another embodiment of the present invention, and FIGS. 13 to 19 are perspective views showing steps of a piston manufacturing method of FIG.

12, the method for manufacturing a piston according to an embodiment of the present invention includes preparing the first member 10 (S31), preparing the second member 20 (S32), forming the first member 10 , A second member 20 assembling step S33, a friction welding protrusion 30 melting step S34, and a cutting step S35. Specifically, the first member 10 preparation step S31 is to prepare the first member 10 which is a ring-shaped insertion member in which a part 11 of the cooling channel is formed downward, and the melting step S34 An inner protrusion 32 formed on the second member 20 with a first radius so that the first member 10 and the second member 20 can be engaged with each other by the friction member F1, And a second member having a second radius so that the first member 10 and the second member 20 can be engaged with each other, The outer protruding portion 34 formed in the outer member 20 may be melted in the form of wrapping at least a part of the first member 10 with the friction tool F2. Of course, the melting step S34-1 of the inner protruding portion 32 and the melting step S34-2 of the outer protruding portion can be performed at the same time.

16 to 17, the inner protruding portion 32 includes a molten portion 32b which is melted by the friction tool F1 and melted and hardened in the outer direction of the piston, and a molten portion 32b which melts in the direction of the center of the piston, A non-melting portion 32c and a non-melting portion 32a.

The outer protruding portion 34 is composed of a molten portion 34b which is melted by the friction tool F2 and melted and hardened in the outer direction of the piston, a molten portion 32c which melts and hardens in the piston inner direction, ).

In order to prevent the outer projected molten portion 34b, which melts and flows outwardly, from flowing downward through the piston when the outer projected portion 34 is melted in the outer projected portion melting step S34-2, The guide part 36 may be formed on one side of the guide part 36. [

Therefore, the piston for the internal combustion engine manufactured by the piston manufacturing method according to the embodiment of the present invention can be firmly engaged with the first member 10 and the second member 20 according to the melting of the friction welding protrusion, Flash does not form on the channel. Therefore, the space of the cooling channel is advantageously ensured, whereby the fluidity of the cooling medium is ensured and a piston with improved reliability can be realized.

While the present invention has been described with reference to exemplary embodiments thereof, 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 appended claims. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: first member
20: second member
30: Friction welding projection
40: ring groove
80: Piston pin boss portion
C: Crown part
S: Skirt section
F: Friction tool

Claims (11)

A first member in which a part of the cooling channel is formed;
A second member on which another portion of the cooling channel is formed; And
And a friction welding protrusion formed on the second member such that the first member and the second member can be engaged and can be melted and filled in the form of wrapping at least a part of the first member by a friction tool,
Wherein the first member comprises:
Shaped insertion member in which a part of the cooling channel is formed in the lower part,
The friction welding protrusions,
An inner protrusion having a first radius; And
And an outer protrusion having a second radius larger than the first radius. The method according to claim 1,
Wherein the first member includes at least a portion of a piston crown portion,
And the second member includes at least a portion of the piston skirt portion. delete delete delete delete Preparing a first member in which a portion of the cooling channel is formed;
Preparing a second member in which another portion of the cooling channel is formed;
Assembling the first member and the second member;
Melting the friction welding protrusions formed on the second member such that the first member and the second member are engaged by wrapping at least a part of the first member with a friction tool; And
Cutting at least a part of at least one of the first member, the second member and the friction welding protrusion,
Wherein the first member preparation step comprises:
And a first member, which is a ring-shaped insertion member in which a part of the cooling channel is formed below,
Wherein the melting step comprises:
An inner protrusion melting step of melting an inner protrusion formed on the second member with a first radius so that the first member and the second member can be engaged by a friction tool to cover at least a part of the first member; And
An outer protrusion melting step of melting an outer protrusion formed on the second member with a second radius so that the first member and the second member can be engaged by a friction tool to cover at least a part of the first member; ≪ / RTI > delete delete delete 8. The method of claim 7,
Wherein the inner protrusion melting step and the outer protrusion melting step comprise:
Wherein said step (c) is carried out simultaneously.
KR1020150059822A 2015-04-28 2015-04-28 Piston for internal combustion engine and manufacturing method of piston using the same KR101730820B1 (en)

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KR102384278B1 (en) * 2019-10-01 2022-04-12 동양피스톤 주식회사 Gasoline engine piston having remelting part in piston head and its manufacturing method

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002096597A1 (en) 2001-05-24 2002-12-05 Federal-Mogul Technology Limited Manufacturing pistons

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2002096597A1 (en) 2001-05-24 2002-12-05 Federal-Mogul Technology Limited Manufacturing pistons
JP2004532372A (en) 2001-05-24 2004-10-21 フェデラル−モウガル テクノロジー リミテッド Manufacture of piston

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