JPH0723560Y2 - Struts for pistons for internal combustion engines - Google Patents
Struts for pistons for internal combustion enginesInfo
- Publication number
- JPH0723560Y2 JPH0723560Y2 JP1795288U JP1795288U JPH0723560Y2 JP H0723560 Y2 JPH0723560 Y2 JP H0723560Y2 JP 1795288 U JP1795288 U JP 1795288U JP 1795288 U JP1795288 U JP 1795288U JP H0723560 Y2 JPH0723560 Y2 JP H0723560Y2
- Authority
- JP
- Japan
- Prior art keywords
- strut
- internal combustion
- protrusion
- piston
- straight line
- Prior art date
- Legal status (The legal status 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 status listed.)
- Expired - Lifetime
Links
Landscapes
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
Description
【考案の詳細な説明】 〔発明の目的〕 （産業上の利用分野） 本考案は可溶性中子を保持するストラツトに関するもの
で、内燃機関用ピストンに利用される。DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a strut for holding a soluble core, and is used for a piston for an internal combustion engine.
（従来の技術） 本考案に係る従来技術としては、本願と同一出願人によ
つて先に特願昭62-057276号にて出願されたものがあ
る。(Prior Art) As a prior art related to the present invention, there is one previously filed in Japanese Patent Application No. 62-057276 by the same applicant as the present application.
この従来技術は、第６図〜第７図に示されるようにトツ
プリング溝41内方周辺を無機繊維集合体42にて複合強化
し、且つトツプリング溝41内方近傍に可溶性中子51を用
いて油冷却用空洞50が形成される内燃機関用ピストンの
製造方法において、可溶性中子51をピストン内部に鋳込
まれる熱膨張抑制用のストラツト60に設けた複数の突起
61,62により固定し、可溶性中子51を固定したストラツ
ト60をパンチ型外周に設けられたストラツト位置決め部
にセツトし、一方、前記無機繊維集合体42を下型の環状
溝にセツトすることにより、ストラツト60に固定された
前記可溶性中子51が前記下型にセツトされた無機繊維集
合体42の内側に非接触の状態で配置され、この状態にて
ピストンを鋳造して、トツプリング溝41の内方周辺を強
化し、且つ油冷却用空洞50が形成される、内燃機関用ピ
ストンの製造方法である。In this prior art, as shown in FIGS. 6 to 7, the inner periphery of the top ring groove 41 is composite reinforced with an inorganic fiber aggregate 42, and a soluble core 51 is formed in the inner periphery of the top ring groove 41. In a method for manufacturing a piston for an internal combustion engine in which an oil cooling cavity 50 is formed using a plurality of protrusions provided on a thermal expansion suppressing strut 60 in which a fusible core 51 is cast inside the piston.
Fixed by 61, 62, the strut 60 with the soluble core 51 fixed is set in the strut positioning portion provided on the outer periphery of the punch die, while the inorganic fiber aggregate 42 is set in the annular groove of the lower die. , The soluble core 51 fixed to the strut 60 is arranged in a non-contact state inside the inorganic fiber assembly 42 set in the lower mold, and in this state, the piston is cast to form the top ring groove 41. Is a method for manufacturing a piston for an internal combustion engine, in which the inner periphery of the is strengthened and an oil cooling cavity 50 is formed.
（考案が解決しようとする課題） 上記従来技術において、油冷却用空洞を形成する可溶性
中子は、ストラツトに設けられた複数の突起61,62によ
つて保持されるが、ピストンのスカート肩部に位置する
突起61を設けているため、スカート肩部にストラツトを
鋳込む必要がある。そのため、スカート肩部の部分に駄
肉をつける必要があり、その駄肉によつて重量増加、お
よび剛性があがることになる。その結果、ピストン上下
動の中でのスカート面圧の増大、およびこれに伴う潤滑
不良によつてスカツフイングが発生するという問題があ
つた。(Problems to be Solved by the Invention) In the above-mentioned conventional technique, the soluble core forming the oil cooling cavity is held by the plurality of projections 61 and 62 provided on the strut, but the skirt shoulder portion of the piston is held. Since the protrusion 61 located on the skirt is provided, it is necessary to cast the strut on the shoulder portion of the skirt. Therefore, it is necessary to attach a pad to the shoulder portion of the skirt, which increases the weight and increases the rigidity. As a result, there is a problem that scuffing occurs due to an increase in the skirt surface pressure during vertical movement of the piston and the resulting poor lubrication.
この問題を解決するためには、スカート方向の突起61を
無くすという方法が考えられるが、これによると、鋳造
時、或いは型セツト時に、可溶性中子51がストラツト60
に対しスカート方向にずれ、トツプリング溝41に対する
油冷却用空洞50の位置が不均一になるため、十分な冷却
効果が得られず、高温になつてトツプリングがステイツ
クする等の問題を生じることになる。In order to solve this problem, a method of eliminating the protrusion 61 in the skirt direction can be considered. However, according to this method, the soluble core 51 is made into the strut 60 at the time of casting or mold setting.
On the other hand, the position of the oil cooling cavity 50 with respect to the top ring groove 41 becomes non-uniform due to the shift in the skirt direction, so a sufficient cooling effect cannot be obtained, and problems such as stapling of the top ring due to high temperature occur. become.
本考案は、上記問題にかんがみ、スカート肩部に駄肉を
つけることなく、鋳造時、或いは型セツト時に位置ずれ
を生じない突起を備えたストラツトにすることを、その
技術的課題とするものである。In view of the above problems, it is a technical object of the present invention to provide a strut having a protrusion that does not cause a positional shift during casting or die setting without adding a pad to the shoulder portion of the skirt. is there.
（課題を解決するための手段） 上記技術的課題を解決するために講じた技術的手段は、
熱膨張抑制用のストラツトに設けた突起にて可溶性中子
を保持し鋳造することにより、トツプリング溝内方近傍
に油冷却用空洞が形成される内燃機関用のピストンにお
いて、前記ストラツトの形状は、相対向する平行な直線
部および円弧部とよりなり、前記直線部の略中央に相対
向する突起と、前記直線部と前記円弧部よりなるコーナ
部近傍の前記直線部側の突起を夫々設けた、内燃機関用
ピストンのストラツトである。(Means for Solving the Problems) Technical means taken for solving the above technical problems are
In a piston for an internal combustion engine in which an oil cooling cavity is formed in the vicinity of the inside of the tapping groove by holding and casting the soluble core with a projection provided on a strut for suppressing thermal expansion, the shape of the strut is , A parallel linear portion and a circular arc portion that face each other, and a protrusion that is substantially in the center of the linear portion and that faces each other, and a protrusion on the linear portion side near the corner portion formed by the linear portion and the circular arc portion, respectively. It is also a piston piston for an internal combustion engine.
（作用） 上記技術的手段により、ストラツトに設けられた突起
は、ピストンのスカート方向、即ち、円弧部には設けて
おらず、したがつて、ピストン鋳造時、スカート肩部に
駄肉をつける必要がなく、コーナ部近傍の直線部側に設
けた突起によつて、可溶性中子を位置ずれなく保持する
ことができ、従来の問題は解消される。(Operation) By the above technical means, the projection provided on the strut is not provided in the skirt direction of the piston, that is, in the arc portion, and therefore, it is necessary to add a pad to the shoulder portion of the skirt when casting the piston. In addition, the soluble core can be held without displacement by the protrusion provided on the linear portion side near the corner, and the conventional problem is solved.
（実施例） 以下、本考案の実施例について図面に基づき説明する。(Embodiment) An embodiment of the present invention will be described below with reference to the drawings.
第１図において、ピストン10は頂部11,スカート部12を
有し、頂部11の外周周縁にはトツプリング溝13,セカン
ドリング溝14,オイルリング溝15を形成し、頂部11のト
ツプリング溝13の内方周辺には油冷却用空洞20が形成さ
れている。油冷却用空洞20には冷却油を循環させるため
の油流入穴22,油流出穴23が設けられている。In FIG. 1, a piston 10 has a top portion 11 and a skirt portion 12. A top ring groove 13, a second ring groove 14, and an oil ring groove 15 are formed on the outer peripheral edge of the top portion 11, and the top ring groove 13 of the top portion 11 is formed. An oil cooling cavity 20 is formed around the inner side of the. The oil cooling cavity 20 is provided with an oil inflow hole 22 and an oil outflow hole 23 for circulating cooling oil.
前記油冷却用空洞20はピストン本体鋳造時、鋳込まれた
熱膨張抑制用のストラツト30に可溶性中子21を保持して
鋳造することにより形成される。The oil cooling cavity 20 is formed by holding the soluble core 21 in the cast strut 30 for suppressing thermal expansion during casting of the piston body and casting.
ストラツト30は鋼板材料からなり、相対向する平行な直
線部30aと円弧部30bとが形成されると共に、直線部30a
の中央部には突起31が形成され、直線部30aと円弧部30b
からなるコーナ部近傍の直線部30a側には、対角線上の
位置に突起32,突起33が形成されている。前記突起31は
先端に曲げ部31aを有し、可溶性中子21のＡ方向（前後
方向）の位置、およびＣ方向（上下方向）への位置を規
制する。突起32は湾曲保持部32aを有し、該湾曲保持部3
2aの垂直部32b面にてＢ方向（横方向）の位置を規制
し、水平部32c面にてＣ方向（上下方向）の位置を規制
する。また突起33はＣ方向の下方への位置を規制する。The strut 30 is made of a steel plate material, and is formed with a parallel straight line portion 30a and a circular arc portion 30b facing each other.
A protrusion 31 is formed at the center of the linear portion 30a and arc portion 30b.
Protrusions 32 and 33 are formed at diagonal positions on the side of the straight line portion 30a near the corner portion. The protrusion 31 has a bent portion 31a at its tip, and restricts the position of the fusible core 21 in the A direction (front-back direction) and the C direction (vertical direction). The protrusion 32 has a curved holding portion 32a, and the curved holding portion 3a
The vertical portion 32b surface of 2a regulates the position in the B direction (lateral direction), and the horizontal portion 32c surface regulates the position in the C direction (vertical direction). Further, the protrusion 33 regulates the downward position in the C direction.
上記ストラツト30に形成された突起31,32,33によつて、
可溶性中子21は、スナツプフイツトにてストラツト30に
保持され、かつ前後方向、横方向、上下方向への位置を
規制される。可溶性中子21を保持したストラツト30はこ
の状態にてパンチ型に位置決めされセツトされた後、鋳
造されて油冷却用空洞20が形成される。By the projections 31, 32, 33 formed on the above-mentioned Strat 30,
The soluble core 21 is held by the strut 30 by a snap fit, and its position in the front-rear direction, the lateral direction, and the vertical direction is restricted. In this state, the strat 30 holding the soluble core 21 is positioned in a punch die and set, and then cast to form the oil cooling cavity 20.
以上の如く、ストラツトの直線部略中央に相対向する突
起、および直線部と円周部よりなるコーナ部の直線部側
に突起を夫々設け、該突起に可溶性中子を保持して鋳造
するようにしたことから位置ずれなく、ピストンスカー
ト部肩部に駄肉をつける必要がなく、且つスカート肩部
の剛性が下がるため、耐スカツフ性が向上する。As described above, the protrusions are provided at the substantially straight center of the strut facing each other, and the protrusions are provided on the straight-line side of the corner portion composed of the straight-line portion and the circumferential portion, respectively. As a result, there is no need to shift the position, it is not necessary to attach a pad to the shoulder portion of the piston skirt, and the rigidity of the shoulder portion of the skirt is reduced, so the scuff resistance is improved.
第１図は本考案実施例によるストラツトを用いて油冷却
用空洞が形成されたピストンの断面図、第２図はストラ
ツトの平面図、第３図は第２図の正面図、第４図は第２
図のＡ−Ａ断面図、第５図は第３図のＢ−Ｂ断面図、第
６図は従来技術におけるストラツトを用いて油冷却用空
洞が形成されたピストンの断面図、第７図は従来技術に
おけるストラツト（可溶性中子を保持した状態）の平面
図である。 10……ピストン,13……トツプリング溝,20……油冷却用
空洞,21……可溶性中子,30……ストラツト,30a……スト
ラツトの直線部,30b……ストラツトの円弧部,31,32,33
……突起。FIG. 1 is a sectional view of a piston in which an oil cooling cavity is formed using a strut according to an embodiment of the present invention, FIG. 2 is a plan view of the stratum, FIG. 3 is a front view of FIG. 2, and FIG. Second
FIG. 5 is a cross-sectional view taken along the line AA of FIG. 5, FIG. 5 is a cross-sectional view taken along the line BB of FIG. 3, FIG. FIG. 6 is a plan view of a strut (a state in which a soluble core is held) in the conventional technique. 10 ...... Piston, 13 ...... Top ring groove, 20 ...... Oil cooling cavity, 21 ...... Soluble core, 30 ...... Strate, 30a ...... Strate straight part, 30b ...... Struct arc part, 31, 32,33
...... Protrusion.
Claims (1)
て可溶性中子を保持し鋳造することによりトツプリング
溝内方近傍に油冷却用空洞が形成される内燃機関用のピ
ストンにおいて、前記ストラツトの形状は、相対向する
平行な直線部および円弧部とよりなり、前記直線部の略
中央に相対向する突起と、前記直線部と前記円弧部より
なるコーナ部近傍の前記直線部側に突起を夫々設けた、
内燃機関用ピストンのストラツト。1. A piston for an internal combustion engine in which an oil cooling cavity is formed in the vicinity of the inside of a tapping groove by holding and casting a soluble core by a protrusion provided on a strut for suppressing thermal expansion, The shape of the strut is composed of parallel straight line portions and arc portions that are opposed to each other, and a protrusion that is opposed to each other at approximately the center of the straight line portion, and on the straight line portion side near the corner portion that is formed by the straight line portion and the arc portion. Each has a protrusion,
Strategies for pistons for internal combustion engines.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1795288U JPH0723560Y2 (en) | 1988-02-12 | 1988-02-12 | Struts for pistons for internal combustion engines |
| DE3831285A DE3831285A1 (en) | 1987-09-17 | 1988-09-14 | METHOD FOR PRODUCING A PISTON OF AN INTERNAL COMBUSTION ENGINE |
| US07/245,899 US4891875A (en) | 1987-09-17 | 1988-09-19 | Method for manufacturing a piston for an internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1795288U JPH0723560Y2 (en) | 1988-02-12 | 1988-02-12 | Struts for pistons for internal combustion engines |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01124058U JPH01124058U (en) | 1989-08-23 |
| JPH0723560Y2 true JPH0723560Y2 (en) | 1995-05-31 |
Family
ID=31232171
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1795288U Expired - Lifetime JPH0723560Y2 (en) | 1987-09-17 | 1988-02-12 | Struts for pistons for internal combustion engines |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0723560Y2 (en) |
-
1988
- 1988-02-12 JP JP1795288U patent/JPH0723560Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01124058U (en) | 1989-08-23 |
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