JPS627958A - Piston of internal-combustion engine - Google Patents

Piston of internal-combustion engine

Info

Publication number
JPS627958A
JPS627958A JP14417385A JP14417385A JPS627958A JP S627958 A JPS627958 A JP S627958A JP 14417385 A JP14417385 A JP 14417385A JP 14417385 A JP14417385 A JP 14417385A JP S627958 A JPS627958 A JP S627958A
Authority
JP
Japan
Prior art keywords
oil
piston
recess
skirt
ring
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.)
Pending
Application number
JP14417385A
Other languages
Japanese (ja)
Inventor
Hiroshi Horiuchi
大資 堀内
Yusuke Kinoshita
裕介 木下
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
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 Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP14417385A priority Critical patent/JPS627958A/en
Publication of JPS627958A publication Critical patent/JPS627958A/en
Pending legal-status Critical Current

Links

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16JPISTONS; CYLINDERS; SEALINGS
    • F16J1/00Pistons; Trunk pistons; Plungers
    • F16J1/02Bearing surfaces

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • Pistons, Piston Rings, And Cylinders (AREA)

Abstract

PURPOSE:To prevent counterflow of oil and reduce oil consumption by forming a recess in those parts of the side face of a skirt which are oriented in the axial direction of a piston pin, wherein the recess is continued to a ring-shaped groove and extends till the bottom of the skirt. CONSTITUTION:A ring-shaped groove 13 is formed at the upper periphery of a skirt 8 below a groove 12 for fitting of oil ring 11 formed at the outside surface of a piston 4. A recess 14, whose top is continued to said ring-shaped groove 13, is formed at those parts of side face of skirt 8 which are oriented in the axial direction of a piston pin 5. The oil which has flowed into the groove 13, sinks along a passage 16 and an oil sump 15 in said recess 14 to drop into the crank case from the bottom of the oil passage 16. This can prevent counterflow of the oil to contribute to reduction of oil consumption.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は内燃機関用ピストンのうち、特にオイルの戻し
に特徴をもたせたものに関する。
DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a piston for an internal combustion engine, particularly one having a feature of oil return.

(従来の技術) ガソリンエンジン等の内燃機関にあっては、シリンダス
リーブの内周面にピストンを摺動自在に配設し、このピ
ストンの摺動をコンロッドを介してクランク軸に伝達す
るようにしている。
(Prior art) In internal combustion engines such as gasoline engines, a piston is slidably disposed on the inner peripheral surface of a cylinder sleeve, and the sliding motion of the piston is transmitted to the crankshaft via a connecting rod. ing.

そして、ピストンがスリーブ内面を摺動する際に、スリ
ーブとピストンとの焼付きを防Iトしスムーズな摺動を
確保すべく、スリーブ内面とピストン外面との間にはオ
イル膜を介在せしめるようにしている。このオイルはピ
ストン下方のオイルパン等から供給されるのであるが、
スリーブ内周面に多量に付着すると、燃焼室内で焼失す
るオイルの量が多くなり、オイル消費の面で好ましくな
い。そこで従来にあっては第4図に示す如くピストン(
100)のヘッド部(101)外周に形成したオイルリ
ング嵌着用溝(402)よりも若干下方位置に環状溝(
103)を形成し、この環状溝(+03)とピストン内
側部とを貫通孔(100で連通し、オイルリングによっ
て掻き落としたオイルを環状溝(103)及び貫通孔(
104)を通して、ピストン下方のオイルパン内に落下
せしめるようにしている。
When the piston slides on the inner surface of the sleeve, an oil film is interposed between the inner surface of the sleeve and the outer surface of the piston to prevent seizure between the sleeve and piston and ensure smooth sliding. I have to. This oil is supplied from the oil pan below the piston,
If a large amount of oil adheres to the inner circumferential surface of the sleeve, a large amount of oil will be burned away in the combustion chamber, which is undesirable in terms of oil consumption. Therefore, in the past, the piston (
An annular groove (
This annular groove (+03) and the inner side of the piston are connected through a through hole (100), and the oil scraped off by the oil ring is transferred to the annular groove (103) and the through hole (100).
104) and fall into the oil pan below the piston.

(発明が解決しようとする問題点) 上述したオイル戻し構造によると、ピストン内側部と環
状溝(103)とが貫通孔を介して直結しているため、
環状溝(103)内のオイルに直接クランクケース内の
圧力が作用し、燃焼室内にオイルの一部が逆流し、オイ
ル消費の改善を十分に達成することができない。特にス
トロークが長い高出力エンジンのい高回転域ではオイル
消費の増加が問題となっている。
(Problems to be Solved by the Invention) According to the above-described oil return structure, since the inner side of the piston and the annular groove (103) are directly connected through the through hole,
The pressure in the crankcase acts directly on the oil in the annular groove (103), and a portion of the oil flows back into the combustion chamber, making it impossible to sufficiently improve oil consumption. Particularly in the high rotation range of high-output engines with long strokes, increased oil consumption is a problem.

(問題点を解決するための手段) 上記問題点を解決すべく本発明は、ピストン外周のオイ
ルリング嵌着用溝よりも下方に形成した環状溝とピスト
ン内側部とを連通せず、ピストンスカート部のうちピス
トンピンの軸方向側面に凹部を形成し、この凹部を前記
環状溝に連続し、この凹部下端をスカート部下端まで伸
ばすことで環状溝内のオイルにクランクケース内の圧力
が大きく作用しないようにした。
(Means for Solving the Problems) In order to solve the above problems, the present invention does not communicate the annular groove formed below the oil ring fitting groove on the outer periphery of the piston with the inner side of the piston, and the piston skirt portion A recess is formed on the axial side surface of the piston pin, this recess is continuous with the annular groove, and the lower end of the recess is extended to the lower end of the skirt so that the pressure inside the crankcase does not act greatly on the oil in the annular groove. I did it like that.

(作用) オイルリングによって掻き落とされたオイルは、環状溝
に入り、この環状溝に入ったオイルはスカート部側面に
形成した凹部をったって下方に落下する。
(Function) The oil scraped off by the oil ring enters the annular groove, and the oil that enters the annular groove falls downward through the recess formed on the side surface of the skirt portion.

(実施例) 以下に本発明の実施例を添付図面に基づいて説明する。(Example) Embodiments of the present invention will be described below based on the accompanying drawings.

第1図は本発明に係るピストンを適用したエンジンの要
部縦断面図、第2図は第1図のA方向から見たピストン
の正面図、第3図は第2図のB−B線断面図である。
Fig. 1 is a vertical cross-sectional view of a main part of an engine to which the piston according to the present invention is applied, Fig. 2 is a front view of the piston seen from direction A in Fig. 1, and Fig. 3 is a line BB in Fig. 2. FIG.

エンジン(+)はシリンダブロック(2)のシリンダ部
(2a)にスリーブ(3)を一体重に設け、このスリー
ブ(3)内周面に本発明に係るピストン(4)を摺動自
在に配設している。
In the engine (+), a sleeve (3) is integrally provided in the cylinder portion (2a) of the cylinder block (2), and a piston (4) according to the present invention is slidably disposed on the inner peripheral surface of the sleeve (3). It is set up.

ピストン(4)はピストンピン(5)を介してコンロッ
ド(6)の小端部に取付けられ、このコンロッド(6)
の大端部は図示しないクラクシャフトに連結している。
The piston (4) is attached to the small end of the connecting rod (6) via a piston pin (5), and the connecting rod (6)
The large end of is connected to a crankshaft (not shown).

またピストン(4)は−]一部のヘッド部(7)と下部
のスカート部(8)とからなり、ヘッド部(7)の外周
面にはコンプレッションリング(9)。
The piston (4) consists of a part of the head part (7) and a lower skirt part (8), and a compression ring (9) is provided on the outer peripheral surface of the head part (7).

(8)を嵌着する溝(10) 、(10)及びオイルリ
ング(ll)を嵌着する溝(12)が形成されている。
Grooves (10), (10) into which the oil ring (8) is fitted, and a groove (12) into which the oil ring (ll) is fitted are formed.

そして、オイルリング(11)を嵌着する溝(12)の
直下にはオイルリング(11)によって掻き落とされた
オイルを受は取る環状溝(13)を形成している。
Immediately below the groove (12) into which the oil ring (11) is fitted, an annular groove (13) is formed to catch the oil scraped off by the oil ring (11).

この環状溝(13)は第3図にも示す如く、上面(13
a)がピストン外側から内側に向って下向きとなった傾
斜面とされ、下面(13b)がピストン内側から外側に
向って下向きとなった傾斜面とされ、オイルを下方に導
きやすくしている。
This annular groove (13) is formed on the upper surface (13) as shown in FIG.
A) is an inclined surface that faces downward from the outside of the piston to the inside, and the lower surface (13b) is an inclined surface that faces downward from the inside of the piston to the outside, making it easier to guide the oil downward.

またスカート部(8)のピストンピン(5)の軸方向側
面にはその上端部が前記環状溝(13)に連続する凹部
(14)が形成されている。この凹部(14)は上部の
オイル溜部(15)と下部のオイル戻し通路(lfl)
 。
Further, a recess (14) whose upper end is continuous with the annular groove (13) is formed on the axial side surface of the piston pin (5) of the skirt portion (8). This recess (14) is connected to an oil reservoir (15) in the upper part and an oil return passage (LFL) in the lower part.
.

(16)とからなり、オイル溜部(15)はその側面(
15a)、(15a)を下方に向って絞られる傾斜面と
し、オイル溜部(15)内に流入したオイルがオイル戻
し通路(1B) 、(1B)に向って流れるようにして
いる。
(16), and the oil reservoir (15) is located on its side (
15a) and (15a) are sloped surfaces that narrow downward, so that the oil flowing into the oil reservoir (15) flows toward the oil return passages (1B) and (1B).

一方、オイル戻し通路(18)、(1B)はピストンピ
ン(5)の軸を中心として左右に一対形成され上端部は
オイル溜部(15)に連続し、下端部はスカート部(8
)の下端面に開口し各オイル戻し通路(1B)の両側面
(lfla)、(lea)は下方に向って絞られた傾斜
面とされ、スリーブ(3)と対向する面(18b)は第
2図に示すように下方に向って徐々にその深さが浅くな
る傾斜面とされ、オイル戻し通路(16)全体の深さは
オイル溜部(15)の深さよりも浅くなっている結果と
してオイル戻し通路の断面積が徐々に絞られオイル溜部
(15)内のオイルが戻りゃすく且つ逆流しに〈〈なっ
ている。また、オイル戻し通路(1B)、(113)の
間にはスカート部(8)の一部をそのまま残している。
On the other hand, a pair of oil return passages (18) and (1B) are formed on the left and right sides around the axis of the piston pin (5), and the upper end portions are continuous with the oil reservoir portion (15), and the lower end portions are connected to the skirt portion (8).
), and both side surfaces (lfla) and (lea) of each oil return passage (1B) are sloped surfaces that are narrowed downward, and the surface (18b) facing the sleeve (3) is an inclined surface. As shown in Figure 2, the oil return passage (16) has an inclined surface whose depth gradually becomes shallower toward the bottom, and as a result, the entire depth of the oil return passage (16) is shallower than the depth of the oil reservoir (15). The cross-sectional area of the oil return passage is gradually narrowed down so that the oil in the oil reservoir (15) returns and flows backwards. Furthermore, a portion of the skirt portion (8) is left as is between the oil return passages (1B) and (113).

一方、スカート部(8)は全体が若干の楕円形状をなし
、その長径方向はピストンピン(5)の軸と直行する方
向とし、短径方向はピストンピン(5)の軸と一致する
方向とし、前記凹部(14)を形成したスカートa側面
とスリーブ(3)内周面との間にクリアランスを形成し
、凹部(14)を形成しないスカート部側面がスリーブ
(3)内周面に密接するようにしている。このようにピ
ストンピン(5)の軸と直行する側面をスリーブ(3)
内周面に密接することでエンジン駆動時のフラッタリン
グを防止でき、また凹部(14)を形成した側面とスリ
ーブ(3)内周面との間に若干のクリアランスを形成す
ることで、オイルリング(11)によって掻き落とされ
たオイルが凹部(14)へ流れ易くなる。
On the other hand, the skirt portion (8) has a slightly elliptical shape as a whole, and its major axis is perpendicular to the axis of the piston pin (5), and its minor axis is aligned with the axis of the piston pin (5). , a clearance is formed between the side surface of the skirt a where the recess (14) is formed and the inner peripheral surface of the sleeve (3), and the side surface of the skirt portion where the recess (14) is not formed is in close contact with the inner peripheral surface of the sleeve (3). That's what I do. In this way, attach the side surface perpendicular to the axis of the piston pin (5) to the sleeve (3).
By being in close contact with the inner circumferential surface, it is possible to prevent fluttering when the engine is running, and by forming a slight clearance between the side surface where the recess (14) is formed and the inner circumferential surface of the sleeve (3), the oil ring The oil scraped off by (11) becomes easier to flow into the recess (14).

以−1−において、ピストン(4)がスリーブ(3)内
周面を摺動すると、スリーブ(3)内周面に付着してい
るオイルは、オイルリング(11)によって1蚤き落と
され環状溝(13)内に入り、この環状溝(13)内に
入ったオイルは凹部(14)のオイル溜部(15)及び
通路(16)をったって下降し、オイル通路(1B)の
下端からクランクケース内に落下する。
In -1- below, when the piston (4) slides on the inner circumferential surface of the sleeve (3), the oil adhering to the inner circumferential surface of the sleeve (3) is removed by the oil ring (11) and becomes annular. The oil that has entered the groove (13) descends through the oil reservoir (15) of the recess (14) and the passage (16), and exits from the lower end of the oil passage (1B). Fall into the crankcase.

(発明の効果) 以上に説明した如く本発明によれば、オイルリングより
も下方に形成し′たオイル戻し用の環状溝とピストン内
側部とを連通せず、環状溝とスカート部側面に形成した
凹部とを連続し、この凹部な介して環状溝内に入ったオ
イルをクランクケース内に戻すようにしたので、オイル
の逆流を防止でき8特にストロークが長い高出力エンジ
ンの高回転域でのオイル消費を低減せしめることができ
、且つ凹部はスカート部側面のうちピストンピン軸方向
側面に形成したので、フラッタリングも発生しない等多
くの効果を発揮する。
(Effects of the Invention) As explained above, according to the present invention, the annular groove for oil return formed below the oil ring does not communicate with the inner side of the piston, and the annular groove is formed on the side surface of the skirt portion. The groove is continuous with the groove, and the oil that has entered the annular groove is returned to the crankcase through the groove, preventing oil backflow. Oil consumption can be reduced, and since the concave portion is formed on the side surface of the skirt portion in the axial direction of the piston pin, there are many effects such as no fluttering.

【図面の簡単な説明】[Brief explanation of drawings]

第1図は本発明に係かるピストンを適用したエンジンの
要部縦断面図、第2図は第1図のA方向から見たピスト
ンの正面図、第3図は第2図のB−B線断面図、第4図
は従来のピストンの断面図である。 尚、図面中、(3)はスリーブ、(4)はピストン、(
5)はピストンピン、(8)はスカート部、(9)はコ
ンプレッションリング、(11)はオイルリング、(1
3)は環状溝、(14)は凹部、(15)はオイル溜部
、(1B)はオイル戻し通路である。
FIG. 1 is a vertical cross-sectional view of a main part of an engine to which a piston according to the present invention is applied, FIG. 2 is a front view of the piston seen from direction A in FIG. 1, and FIG. 3 is a line BB in FIG. 2. A line sectional view, FIG. 4 is a sectional view of a conventional piston. In addition, in the drawing, (3) is a sleeve, (4) is a piston, (
5) is the piston pin, (8) is the skirt part, (9) is the compression ring, (11) is the oil ring, (1
3) is an annular groove, (14) is a recess, (15) is an oil reservoir, and (1B) is an oil return passage.

Claims (1)

【特許請求の範囲】[Claims] ピストン外周に形成したオイルリング嵌着用溝よりも下
方のスカート部の上部外周に環状溝を形成し、この環状
溝に連続するとともにスカート部下端まで伸びる凹部を
スカート部側面のうちピストンピンの軸方向側面に形成
したことを特徴とする内燃機関用ピストン。
An annular groove is formed on the upper outer periphery of the skirt portion below the oil ring fitting groove formed on the outer periphery of the piston, and a recess that is continuous with the annular groove and extends to the lower end of the skirt is formed on the side surface of the skirt portion in the axial direction of the piston pin. A piston for an internal combustion engine characterized by having a side surface formed.
JP14417385A 1985-07-01 1985-07-01 Piston of internal-combustion engine Pending JPS627958A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14417385A JPS627958A (en) 1985-07-01 1985-07-01 Piston of internal-combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14417385A JPS627958A (en) 1985-07-01 1985-07-01 Piston of internal-combustion engine

Publications (1)

Publication Number Publication Date
JPS627958A true JPS627958A (en) 1987-01-14

Family

ID=15355901

Family Applications (1)

Application Number Title Priority Date Filing Date
JP14417385A Pending JPS627958A (en) 1985-07-01 1985-07-01 Piston of internal-combustion engine

Country Status (1)

Country Link
JP (1) JPS627958A (en)

Similar Documents

Publication Publication Date Title
JP2005520082A (en) Integrated casting piston with oil drain groove and closed passage
US10927787B2 (en) Piston for internal combustion engine
JPS627958A (en) Piston of internal-combustion engine
JPH0424539B2 (en)
JPH0649745U (en) Piston for internal combustion engine
JP3108903B2 (en) Piston engine
JPH0219531Y2 (en)
JP2003286816A (en) Internal combustion engine
JP2002013441A (en) Piston for internal combustion engine
JPS6126565Y2 (en)
JPH0415969Y2 (en)
JPS6329166Y2 (en)
JPH0746836Y2 (en) Connection structure of piston and connecting rod
JP2008240718A (en) Piston structure of two cycle internal combustion engine
JPS6224019Y2 (en)
JPS603927Y2 (en) Lubrication system for horizontally opposed internal combustion engines
JPH0320522Y2 (en)
SU1521891A1 (en) Crank-piston assembly
JPH0734201Y2 (en) Internal combustion engine pistons
JPS5933881Y2 (en) Piston for internal combustion engine
JPH021466Y2 (en)
JPH0430360Y2 (en)
KR20050034785A (en) Piston skirt structure
JPH0484744U (en)
JPS6240083Y2 (en)