JPS6350440Y2 - - Google Patents
Info
- Publication number
- JPS6350440Y2 JPS6350440Y2 JP14914882U JP14914882U JPS6350440Y2 JP S6350440 Y2 JPS6350440 Y2 JP S6350440Y2 JP 14914882 U JP14914882 U JP 14914882U JP 14914882 U JP14914882 U JP 14914882U JP S6350440 Y2 JPS6350440 Y2 JP S6350440Y2
- Authority
- JP
- Japan
- Prior art keywords
- wall
- mouthpiece
- bore
- cylinder block
- thickness
- 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
Links
- 238000002485 combustion reaction Methods 0.000 claims description 6
- 238000007789 sealing Methods 0.000 description 10
- 238000005452 bending Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【考案の詳細な説明】
本考案は渦流式燃焼室を備えたエンジン（以下
渦室式エンジンという）において、シリンダボア
の変形を減少せしめるシリンダブロツクのトツプ
デツキ形状の改良に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in the top deck shape of a cylinder block that reduces deformation of the cylinder bore in an engine equipped with a swirl combustion chamber (hereinafter referred to as a swirl chamber engine).
前記シリンダのボア壁の変形は、シリンダヘツ
ドをシリンダブロツクに締着した際に、主として
トツプデツキ部の曲げ変形によつて起きるもの
で、ボア壁の変形量は、トツプデツキ部でボア壁
とシリンダブロツクの外壁とを連結したクローズ
ドデツキのものが、ボア壁と外壁とを連結しない
オープンデツキのものより多い。これは第１図に
示すように、シリンダヘツドボルト締付けによつ
て、外壁側のシリンダヘツドボルトボス部に軸力
Ｆが作用し、軸力Ｆとは相対方向に、ボア壁周り
にボアグロメツトＧを介しての押付け力Ｐが作用
しているため、クローズドデツキのものは橋梁部
Ｈが曲り、これに連れてボア壁が変形するためで
ある。よつて、ボア壁の変形量を少なくするには
オープンデツキの方が好ましいが、渦室式エンジ
ンでは、燃焼室の口金が部分的にボア壁の外側に
配置されているため、ガスシール性の問題から口
金に相対するトツプデツキ部はボア壁と外壁とを
連結しなければならず、完全なオープンデツキに
はできない。 The deformation of the cylinder bore wall occurs mainly due to bending deformation of the top deck when the cylinder head is fastened to the cylinder block. There are more closed decks that connect the outer wall than open decks that do not connect the bore wall and the outer wall. This is because, as shown in Fig. 1, when the cylinder head bolt is tightened, an axial force F acts on the cylinder head bolt boss on the outer wall side, and a bore grommet G is applied around the bore wall in a direction relative to the axial force F. This is because the bridge portion H of the closed deck is bent due to the pressing force P acting through the bridge, and the bore wall is accordingly deformed. Therefore, an open deck is preferable in order to reduce the amount of deformation of the bore wall, but in a swirl chamber engine, the combustion chamber mouthpiece is partially located outside the bore wall, so gas sealing performance is reduced. Due to the problem, the top deck part facing the cap must connect the bore wall and the outer wall, and it cannot be made into a completely open deck.
クローズドデツキのボア壁の変形量を少なくす
るには、橋梁部Ｈの肉厚を厚くして橋梁部Ｈを曲
げないようにすればよいが、ボアグロメツトＧを
介してシリンダヘツドを変形させることになり、
シリンダヘツドの信頼性を低させることになる。 In order to reduce the amount of deformation of the bore wall of a closed deck, the wall thickness of the bridge section H can be made thicker to prevent the bridge section H from bending, but this would require deforming the cylinder head via the bore grommet G. ,
This will reduce the reliability of the cylinder head.
一方、第１図に示すような問題については、例
えば実開昭56−71936号公報には、ピストンのオ
イルリング上死点位置近傍にシリンダヘツドボル
トボス部とボア間連接部とを連結する連結部材が
設けられ、またトツプデツキ面近傍でシリンダヘ
ツドボルト軸の中間位置近傍にボア壁を外壁とを
連結する連結部材が設けられ、ボア壁の変形量を
少なくする技術が開示されているが、渦室式エン
ジンの構造については考慮されていない。 On the other hand, regarding the problem shown in Fig. 1, for example, Japanese Utility Model Application No. 56-71936 discloses a connection that connects the cylinder head bolt boss section and the inter-bore connection section near the top dead center position of the oil ring of the piston. A connecting member is provided near the top deck surface and near the intermediate position of the cylinder head bolt axis to connect the bore wall to the outer wall, thereby reducing the amount of deformation of the bore wall. The structure of the indoor engine is not considered.
そこで、本考案はガスシール性を損うことなく
且つシリンダヘツドの変形を抑制して、ボア壁の
変形量を少なくする渦室式エンジンのシリンダブ
ロツク構造を提供するものである。すなわち渦流
式燃焼室の口金に相対するトツプデツキ部のボア
壁と外壁とが連結された橋梁部において、橋梁部
の肉厚を、口金の外周外側で且つ該外周近傍のガ
スシール部と、このガスシール部を除く口金の下
側とで異ならせ、口金の下側部肉厚をガスシール
部肉厚より薄くし、ガスシール性を損うことなく
ボア壁の変形量を少なくするようにしたことを特
徴とするものである。 Therefore, the present invention provides a cylinder block structure for a swirl chamber engine that suppresses deformation of the cylinder head and reduces the amount of deformation of the bore wall without impairing gas sealing performance. In other words, in the bridge section where the bore wall and outer wall of the top deck part facing the mouthpiece of the swirl combustion chamber are connected, the wall thickness of the bridge part is determined by the thickness of the bridge part on the outside of the mouthpiece's outer periphery and the gas seal part near the outer periphery, The lower part of the mouthpiece, excluding the sealing part, is made different, and the thickness of the lower part of the mouthpiece is made thinner than that of the gas seal part, thereby reducing the amount of deformation of the bore wall without impairing gas sealing performance. It is characterized by:
以下、本考案の実施例を図面に基き説明する。 Embodiments of the present invention will be described below with reference to the drawings.
渦流式燃焼室１の口金２が相対するシリンダブ
ロツク３のトツプデツキ部は、ガスシールのた
め、ボア壁４と外壁５とが橋梁部６によつて連結
されており、橋梁部６の肉厚を、シリンダヘツド
ガスケツトのボアグロメツト７が当接する口金２
の外周外側で且つ該外周近傍のガスシール部６ａ
と、ガスシール部６ａを除く口金２の下側部６ｂ
とで異ならせ、口金２の下側部６ｂの肉厚T2を
ガスシール部６ａの肉厚T1より薄くしている。
ガスシール部６ａには、シリンダヘツドボルト８
の締付けによりシリンダブロツク３にシリンダヘ
ツド９が締着され、ボアグロメツト７を介して押
付け力Ｐが作用しており、外壁５側のシリンダヘ
ツドボルトボス部１０には軸力Ｆが作用してい
る。ガスシール部６ａの肉厚T1は、ガスシール
性を確保し得る面圧が確保できる肉厚であり、口
金２の下側部６ｂの肉厚T2は、軸力Ｆと、軸力
Ｆとは相対方向に作用する押付け力Ｐを、曲げ変
形によつて吸収し、ボア壁の変形量を少なくする
肉厚である。 In the top deck part of the cylinder block 3, which the mouthpiece 2 of the swirl combustion chamber 1 faces, the bore wall 4 and the outer wall 5 are connected by a bridge part 6 for gas sealing. , the base 2 that the bore grommet 7 of the cylinder head gasket comes into contact with.
a gas seal portion 6a on the outside of the outer periphery and near the outer periphery;
and a lower part 6b of the cap 2 excluding the gas seal part 6a.
The wall thickness T 2 of the lower side portion 6b of the cap 2 is made thinner than the wall thickness T 1 of the gas seal portion 6a.
A cylinder head bolt 8 is attached to the gas seal portion 6a.
By tightening, the cylinder head 9 is fastened to the cylinder block 3, a pressing force P is applied via the bore grommet 7, and an axial force F is applied to the cylinder head bolt boss portion 10 on the outer wall 5 side. The wall thickness T 1 of the gas seal portion 6a is a wall thickness that can ensure a surface pressure that can ensure gas sealing performance, and the wall thickness T 2 of the lower side portion 6b of the mouthpiece 2 is a wall thickness that is equal to the axial force F and the axial force F. is a wall thickness that absorbs the pressing force P acting in the relative direction through bending deformation and reduces the amount of deformation of the bore wall.
従つて、口金２が相対するトツプデツキ部のボ
ア壁４を外壁５とが連結される橋梁部６におい
て、ガスシール部６ａの肉厚T1をシール面圧を
確保できる肉厚にすることによつて、ガスシール
性を保証し、ガスシール部６ａを除く口金２の下
側部６ｂの肉厚T2を前記肉厚T1より薄くするこ
とによつて、ボア壁の変形量を少なくすることが
できる。 Therefore, in the bridge section 6 where the bore wall 4 of the top deck section, which the mouthpiece 2 faces, is connected to the outer wall 5, the wall thickness T1 of the gas seal section 6a is set to a thickness that can ensure the sealing surface pressure. In this way, the amount of deformation of the bore wall is reduced by ensuring gas sealing performance and making the wall thickness T2 of the lower side part 6b of the mouthpiece 2, excluding the gas sealing part 6a , thinner than the above-mentioned wall thickness T1. I can do it.
なお、前記実施例では口金２が相対する部分の
トツプデツキ部形状のみ説明していが、その他の
トツプデツキ部については、ボア壁４の変形量を
少なくするために極力ボア壁４と外壁５とを連結
しないようにし、連結する箇所では橋梁部の肉厚
を口金の下側部６ｂの肉厚T2並みに薄くするこ
とが好ましい。 In the above embodiment, only the shape of the top deck portion where the mouthpiece 2 faces is explained, but for other top deck portions, the bore wall 4 and the outer wall 5 are connected as much as possible in order to reduce the amount of deformation of the bore wall 4. It is preferable that the wall thickness of the bridge portion be as thin as the wall thickness T 2 of the lower side portion 6b of the cap at the connecting portion.
以上のように本考案は、渦室式エンジンにおい
て、口金が相対するトツプデツキ部のボア壁と外
壁とを連結する橋梁部を、ガスシール部の肉厚を
厚くし、その他の部分をこの肉厚より薄くするこ
とによつて、ガスシール性を損うことなくボア壁
の変形量を少なくする効果を有するものである。 As described above, in the present invention, in a vortex chamber engine, the gas seal part of the bridge part connecting the bore wall and the outer wall of the top deck part where the mouthpiece faces each other is made thicker, and the other parts are made thicker. By making it thinner, it has the effect of reducing the amount of deformation of the bore wall without impairing gas sealing properties.
第１図は従来のシリンダヘツド締着によるボア
壁変形状態を示すシリンダブロツクの要部の断面
図、第２図は本考案の一実施例を示すシリンダブ
ロツクの平面図、第３図は第２図の−断面
図、第４図は本考案のボア壁変形状態を示すもの
で第２図の−断面図である。
１……渦流式燃焼室、２……口金、３……シリ
ンダブロツク、４……シリンダボア壁、５……シ
リンダブロツク外壁、６……橋梁部、６ａ……ガ
スシール部、６ｂ……口金の下側部、７……ボア
グロメツト、９……シリンダヘツド、T1……ガ
スシール部肉厚、T2……口金の下側部肉厚、Ｆ
……シリンダヘツドボルト軸力、Ｐ……押付け
力。
Fig. 1 is a cross-sectional view of the main part of a cylinder block showing the deformed state of the bore wall due to conventional cylinder head tightening, Fig. 2 is a plan view of the cylinder block showing an embodiment of the present invention, and Fig. FIG. 4 is a cross-sectional view of FIG. 2 showing the deformed state of the bore wall of the present invention. DESCRIPTION OF SYMBOLS 1... Whirlpool combustion chamber, 2... Mouthpiece, 3... Cylinder block, 4... Cylinder bore wall, 5... Cylinder block outer wall, 6... Bridge portion, 6a... Gas seal portion, 6b... Mouthpiece. Lower part, 7...Bore grommet, 9...Cylinder head, T1 ...Gas seal part wall thickness, T2 ...Lower part wall thickness of mouthpiece, F
... Cylinder head bolt axial force, P ... Pressing force.
Claims (1)
の外側に配置されたシリンダヘツドを備え、シリ
ンダブロツクトツプデツキ部の前記口金と相対す
る部分に、シリンダボア壁とシリンダブロツク外
壁とが連結される橋梁部を備えたシリンダブロツ
ク構造において、前記橋梁部の肉厚を、前記口金
の外周外側で且つ該外周近傍のガスシール部と、
このガスシール部を除く口金の下側部とで異なら
せ、口金の下側部肉厚をガスシール部肉厚より薄
くしたことを特徴とするエンジンのシリンダブロ
ツク構造。 A bridge section in which the mouthpiece of the swirl combustion chamber includes a cylinder head partially disposed outside the cylinder bore wall, and the cylinder bore wall and the outer wall of the cylinder block are connected to a portion of the cylinder block tread portion facing the mouthpiece. In the cylinder block structure, the wall thickness of the bridge portion is set such that the thickness of the bridge portion is equal to that of the gas seal portion outside the outer periphery of the mouthpiece and near the outer periphery;
A cylinder block structure for an engine, characterized in that the lower part of the mouthpiece, excluding the gas seal part, is different in thickness, and the lower part of the mouthpiece is thinner than the gas seal part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14914882U JPS5952151U (en) | 1982-09-30 | 1982-09-30 | Engine cylinder block structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14914882U JPS5952151U (en) | 1982-09-30 | 1982-09-30 | Engine cylinder block structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5952151U JPS5952151U (en) | 1984-04-05 |
| JPS6350440Y2 true JPS6350440Y2 (en) | 1988-12-26 |
Family
ID=30331165
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14914882U Granted JPS5952151U (en) | 1982-09-30 | 1982-09-30 | Engine cylinder block structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952151U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1089144A (en) * | 1996-09-20 | 1998-04-07 | Mazda Motor Corp | Cylinder block structure of indirect injection diesel engine |
-
1982
- 1982-09-30 JP JP14914882U patent/JPS5952151U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5952151U (en) | 1984-04-05 |
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