JP2019056308A - Cylinder block - Google Patents

Cylinder block Download PDF

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Publication number
JP2019056308A
JP2019056308A JP2017179678A JP2017179678A JP2019056308A JP 2019056308 A JP2019056308 A JP 2019056308A JP 2017179678 A JP2017179678 A JP 2017179678A JP 2017179678 A JP2017179678 A JP 2017179678A JP 2019056308 A JP2019056308 A JP 2019056308A
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cylinder
metal
deck
head
cylinder block
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真人 澤下
Masato Sawashita
真人 澤下
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Daihatsu Motor Co Ltd
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Daihatsu Motor Co Ltd
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Abstract

To suppress the number of part items, and to reduce an anxiety that the seal performance of a fuel gas is lowered.SOLUTION: A cylinder head is placed on a metal-made deck part 20, and a head bolt for fastening the cylinder head to a cylinder main body 12 is screwed into a metal-made boss part 22. A resin-made external wall part 24 is hybrid-joined to metal, and forms a water jacket 18 for surrounding a cylinder part 16 together with the cylinder part 16.SELECTED DRAWING: Figure 1

Description

この発明は、シリンダブロックに関し、特に、金属を主体たる素材とし、気筒部と外壁部との間にウォータージャケットを形成してなる、シリンダブロックに関する。   The present invention relates to a cylinder block, and more particularly to a cylinder block made of a material mainly made of metal and having a water jacket formed between a cylinder portion and an outer wall portion.

この種のシリンダブロックの一例が、特許文献１に開示されている。この文献によれば、シリンダブロックに設けられたウォータージャケットの外壁部が、樹脂材料で形成される。外壁部は、金属を材料としかつ外壁部とは別に準備されたシリンダブロック本体およびシリンダヘッドによって挟み込まれる。   An example of this type of cylinder block is disclosed in Patent Document 1. According to this document, the outer wall portion of the water jacket provided in the cylinder block is formed of a resin material. The outer wall portion is sandwiched between a cylinder block body and a cylinder head which are made of metal and are prepared separately from the outer wall portion.

特開２００５−１４６８８０号公報JP 2005-146880 A

しかし、特許文献１の技術では、外壁部がシリンダブロック本体およびシリンダヘッドとは別体であるため、部品点数が増大してしまう。また、外壁部の樹脂化はシリンダブロックの軽量化に貢献するものの、シリンダヘッドをヘッドボルトでシリンダブロックに締め付ける際に外壁部が圧縮変形し、これによって水、燃料ガスのシール性能が低下するおそれがある。   However, in the technique of Patent Document 1, the outer wall portion is separate from the cylinder block main body and the cylinder head, so that the number of parts increases. In addition, the resinization of the outer wall contributes to the weight reduction of the cylinder block, but when the cylinder head is tightened to the cylinder block with the head bolt, the outer wall is compressed and deformed, which may reduce the sealing performance of water and fuel gas. There is.

それゆえに、この発明の主たる目的は、部品点数を抑制でき、かつ水、燃料ガスのシール性能が低下する懸念を軽減することができる、シリンダブロックを提供することである。   Therefore, a main object of the present invention is to provide a cylinder block capable of suppressing the number of parts and reducing the concern that the sealing performance of water and fuel gas is reduced.

この発明に係るシリンダブロックは、シリンダヘッドが載置される金属製のデッキ部、シリンダヘッドを締め付けるヘッドボルトが螺入される金属製のボス部、および金属とハイブリッド接合され、気筒部を囲むウォータージャケットを気筒部とともに形成する樹脂製の外壁部を備える。   A cylinder block according to the present invention includes a metal deck portion on which a cylinder head is placed, a metal boss portion into which a head bolt for tightening the cylinder head is screwed, and a water that is hybrid-bonded to the metal and surrounds the cylinder portion. A resin-made outer wall portion that forms the jacket together with the cylinder portion is provided.

樹脂製の外壁部は金属とハイブリッド接合されるため、デッキ部，ボス部および外壁部を一体的に成形することができ、これによって部品点数を抑えることができる。また、デッキ部およびボス部は金属製であるため、シリンダヘッドをヘッドボルトで締め付ける際に圧縮変形が生じる懸念、ひいては燃料ガスのシール性能が低下する懸念を軽減することができる。   Since the resin-made outer wall portion is hybrid-bonded to the metal, the deck portion, the boss portion, and the outer wall portion can be integrally formed, thereby reducing the number of parts. Further, since the deck portion and the boss portion are made of metal, it is possible to reduce the concern that compression deformation will occur when the cylinder head is tightened with the head bolt, and that the fuel gas sealing performance will be reduced.

この発明の上述の目的，その他の目的，特徴および利点は、図面を参照して行う以下の実施例の詳細な説明から一層明らかとなろう。   The above object, other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments with reference to the drawings.

この実施例のシリンダブロックの外観を示す斜視図である。It is a perspective view which shows the external appearance of the cylinder block of this Example.

図１を参照して、この実施例のシリンダブロック１０は、ブロック本体１２とその下部に設けられたスカート部１４とを備える。また、ブロック本体１２は、金属（厳密には、アルミ）を材料とする単一のデッキ部２０と、同じ金属を材料とする複数のボス部２２，２２，…と、樹脂を材料とする複数の外壁部２４，２４，…とを備え、さらに各々が上下方向に延在する複数の気筒部１６，１６，…を有する。   Referring to FIG. 1, a cylinder block 10 of this embodiment includes a block main body 12 and a skirt portion 14 provided at the lower portion thereof. The block body 12 includes a single deck portion 20 made of metal (strictly, aluminum), a plurality of boss portions 22, 22,... Made of the same metal material, and a plurality of resins made of material. Are provided with a plurality of cylinder parts 16, 16,... Each extending in the vertical direction.

デッキ部２０は、主面が上方または下方を向くように板状に形成される。上方から眺めたとき、デッキ部２０の外縁は角丸長方形をなす。また、デッキ部２０の主面中央には、気筒部１６の上部外周面との間で空隙が形成される大きさの貫通孔ＨＬ１が形成される。   The deck portion 20 is formed in a plate shape so that the main surface faces upward or downward. When viewed from above, the outer edge of the deck portion 20 forms a rounded rectangle. Further, a through hole HL <b> 1 is formed in the center of the main surface of the deck portion 20 so as to form a gap with the upper outer peripheral surface of the cylinder portion 16.

外壁部２４もまた板状に形成され、デッキ部２０の主面に対して直交するようにデッキ部２０とスカート部１４との間に設けられる。外壁部２４の内側面と気筒部１６の外周面との間には空隙が形成され、この空隙は貫通孔ＨＬ１の内側面と気筒部１６の上部外周面との間に形成された空隙と連通する。こうして形成された空隙は、冷却水が注入されることでウォータージャケット１８として機能する。   The outer wall portion 24 is also formed in a plate shape, and is provided between the deck portion 20 and the skirt portion 14 so as to be orthogonal to the main surface of the deck portion 20. A gap is formed between the inner side surface of the outer wall portion 24 and the outer peripheral surface of the cylinder portion 16, and this gap communicates with the gap formed between the inner side surface of the through hole HL 1 and the upper outer peripheral surface of the cylinder portion 16. To do. The gap formed in this way functions as a water jacket 18 by injecting cooling water.

なお、外壁部２４の内側面には凹凸が形成され、ウォータージャケット１８の断面積は、気筒部１６の位置，深さ，方向に応じて適宜変化する。この結果、冷却水の容量，冷却部位，冷却水の流量がコントロールされ、シリンダボアの保温性や気筒部１６間の冷却バランスが確保される（つまり、別体のウォータージャケットスペーサを挿入する場合と同等の効果が、シリンダブロック１０単体で得られる）。   In addition, unevenness is formed on the inner side surface of the outer wall portion 24, and the cross-sectional area of the water jacket 18 appropriately changes according to the position, depth, and direction of the cylinder portion 16. As a result, the capacity of the cooling water, the cooling site, and the flow rate of the cooling water are controlled, and the heat retention of the cylinder bore and the cooling balance between the cylinder parts 16 are ensured (that is, equivalent to inserting a separate water jacket spacer). Is obtained with the cylinder block 10 alone).

ボス部２２はスティック状に形成され、上下方向に延在する姿勢でデッキ部２０とスカート部１４との間に設けられる。デッキ部２０とスカート部１４との間には外壁部２４も設けられるため、ブロック本体１２の外周方向に交互に配されることとなる。   The boss portion 22 is formed in a stick shape, and is provided between the deck portion 20 and the skirt portion 14 in a posture extending in the vertical direction. Since the outer wall portion 24 is also provided between the deck portion 20 and the skirt portion 14, they are alternately arranged in the outer peripheral direction of the block main body 12.

上方から眺めてデッキ部２０およびボス部２２が重なる位置には、デッキ部２０の厚みとボス部２２の全長との総和に相当する長さを有して上下方向に延在する孔ＨＬ２が形成される。   A hole HL2 having a length corresponding to the sum of the thickness of the deck portion 20 and the total length of the boss portion 22 and extending in the vertical direction is formed at a position where the deck portion 20 and the boss portion 22 overlap when viewed from above. Is done.

デッキ部２０には、シリンダヘッド（図示せず）が載置される。載置されたシリンダヘッドを上方から眺めたとき、デッキ部２０に形成された孔ＨＬ２と重なる位置には、図示しない貫通孔が形成される。ヘッドボルト（図示せず）は、この貫通孔を通して孔ＨＬ２に螺入される。これによって、シリンダヘッドがブロック本体１２に締め付けられる。   A cylinder head (not shown) is placed on the deck unit 20. When the mounted cylinder head is viewed from above, a through hole (not shown) is formed at a position overlapping with the hole HL2 formed in the deck portion 20. A head bolt (not shown) is screwed into the hole HL2 through this through hole. As a result, the cylinder head is fastened to the block body 12.

上述のように、デッキ部２０およびボス部２２は金属を材料とするが、これに加えて、スカート部１４，気筒部１６，シリンダヘッドおよびヘッドボルトもまた金属を材料とする。これに対して、外壁部２４は、上述のように樹脂を材料とする。これを踏まえて、外壁部２４は、スカート部１４，デッキ部２０，ボス部２２などの金属を材料とする部分とハイブリッド接合される。   As described above, the deck portion 20 and the boss portion 22 are made of metal. In addition, the skirt portion 14, the cylinder portion 16, the cylinder head, and the head bolt are also made of metal. In contrast, the outer wall portion 24 is made of resin as described above. Based on this, the outer wall portion 24 is hybrid-bonded to a portion made of a metal such as the skirt portion 14, the deck portion 20, and the boss portion 22.

以上の説明から分かるように、金属製のデッキ部２０にはシリンダヘッドが載置され、金属製のボス部２２にはシリンダヘッドをブロック本体１２に締め付けるためのヘッドボルトが螺入される。樹脂製の外壁部２４は、金属とハイブリッド接合され、気筒部１６を囲むウォータージャケット１８を気筒部１６とともに形成する。   As can be understood from the above description, a cylinder head is placed on the metal deck portion 20, and a head bolt for fastening the cylinder head to the block body 12 is screwed into the metal boss portion 22. The resin outer wall portion 24 is hybrid-bonded with a metal, and forms a water jacket 18 surrounding the cylinder portion 16 together with the cylinder portion 16.

樹脂製の外壁部２４は金属とハイブリッド接合されるため、シリンダブロック１０を一体成形することができ、これによって部品点数を抑えることができる。また、デッキ部２０およびボス部２２は金属製であるため、シリンダヘッドをヘッドボルトで締め付ける際に圧縮変形が生じる懸念、ひいては燃料ガスのシール性能が低下する懸念を軽減することができる。   Since the resin-made outer wall portion 24 is hybrid-bonded to the metal, the cylinder block 10 can be integrally formed, thereby reducing the number of parts. Further, since the deck portion 20 and the boss portion 22 are made of metal, it is possible to reduce the concern that compression deformation will occur when the cylinder head is tightened with the head bolt, and that the fuel gas sealing performance will be reduced.

また、外壁部２４を樹脂製とすることで、燃料によって生じた熱の大気への移動が抑制されるため、ウォータージャケット１８に注入された冷却水の温度が早期に上昇する。これによって、燃費の改善が図られる。   Moreover, since the movement of the heat generated by the fuel to the atmosphere is suppressed by making the outer wall portion 24 made of resin, the temperature of the cooling water injected into the water jacket 18 rises early. As a result, fuel consumption is improved.

さらに、別体のウォータージャケットスペーサを挿入する場合には、取り付け位置のばらつきに起因するシリンダボア温度のばらつきが生じるところ、シリンダブロック１０を一体成形することで、このようなばらつきを排除することができる。   Further, when a separate water jacket spacer is inserted, the cylinder bore temperature varies due to variations in the mounting position, and such variations can be eliminated by integrally forming the cylinder block 10. .

１０ …シリンダブロック
１２ …ブロック本体
１６ …気筒部
１８ …ウォータージャケット
２０ …デッキ部
２２ …ボス部
２４ …外壁部 DESCRIPTION OF SYMBOLS 10 ... Cylinder block 12 ... Block main body 16 ... Cylinder part 18 ... Water jacket 20 ... Deck part 22 ... Boss part 24 ... Outer wall part

Claims (1)

シリンダヘッドが載置される金属製のデッキ部、
前記シリンダヘッドを締め付けるヘッドボルトが螺入される金属製のボス部、および
前記金属とハイブリッド接合され、気筒部を囲むウォータージャケットを前記気筒部とともに形成する樹脂製の外壁部を備える、シリンダブロック。 A metal deck on which the cylinder head is placed,
A cylinder block comprising: a metal boss portion into which a head bolt for tightening the cylinder head is screwed; and a resin outer wall portion that is hybrid-bonded with the metal and forms a water jacket surrounding the cylinder portion together with the cylinder portion.
JP2017179678A 2017-09-20 2017-09-20 Cylinder block Pending JP2019056308A (en)

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JP2017179678A JP2019056308A (en) 2017-09-20 2017-09-20 Cylinder block

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01173363U (en) * 1988-05-17 1989-12-08
JPH11223153A (en) * 1998-02-05 1999-08-17 Nissan Motor Co Ltd Cylinder block for internal combustion engine
JP2000213409A (en) * 1999-01-21 2000-08-02 Hino Motors Ltd Seal structure
JP2008248738A (en) * 2007-03-29 2008-10-16 Toyoda Gosei Co Ltd Water jacket structure for engine

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH01173363U (en) * 1988-05-17 1989-12-08
JPH11223153A (en) * 1998-02-05 1999-08-17 Nissan Motor Co Ltd Cylinder block for internal combustion engine
JP2000213409A (en) * 1999-01-21 2000-08-02 Hino Motors Ltd Seal structure
JP2008248738A (en) * 2007-03-29 2008-10-16 Toyoda Gosei Co Ltd Water jacket structure for engine

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