JP2000170603A - Cylinder block high rigidity structure - Google Patents
Cylinder block high rigidity structureInfo
- Publication number
- JP2000170603A JP2000170603A JP10351266A JP35126698A JP2000170603A JP 2000170603 A JP2000170603 A JP 2000170603A JP 10351266 A JP10351266 A JP 10351266A JP 35126698 A JP35126698 A JP 35126698A JP 2000170603 A JP2000170603 A JP 2000170603A
- Authority
- JP
- Japan
- Prior art keywords
- main bearing
- rigidity
- cylinder block
- partition
- 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.)
- Pending
Links
- 238000005192 partition Methods 0.000 claims abstract description 269
- 239000000463 material Substances 0.000 claims description 50
- 238000005266 casting Methods 0.000 claims description 41
- 230000013011 mating Effects 0.000 claims description 26
- 239000000470 constituent Substances 0.000 claims description 14
- 230000002093 peripheral effect Effects 0.000 abstract description 30
- 230000000452 restraining effect Effects 0.000 abstract 2
- 239000013585 weight reducing agent Substances 0.000 description 14
- 238000004519 manufacturing process Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
Landscapes
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、シリンダブロック
の軽量化に伴う剛性の低下を防止できる、シリンダブロ
ック高剛性構造に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a highly rigid structure for a cylinder block, which can prevent a reduction in rigidity due to a reduction in the weight of the cylinder block.
【０００２】[0002]
【従来の技術】自動車の燃費向上、生産コスト低減等の
ため、エンジンのシリンダブロックの軽量化が盛んに研
究されており、軽量化の一手段として、シリンダブロッ
クを構成する壁の薄肉化が図られている。2. Description of the Related Art In order to improve the fuel efficiency of automobiles and to reduce production costs, the weight of engine cylinder blocks has been actively studied. One way to reduce the weight is to reduce the wall thickness of the cylinder blocks. Have been.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、壁をむ
やみに薄肉化すると、機械的荷重に対するシリンダブロ
ックの剛性が低下し、そのために、運転中にシリンダブ
ロックが変形して、エンジンの停止、振動の増大、損傷
といった問題の生じる恐れがあった。特に、主軸受キャ
ップの上下方向の変形、主軸受キャップのクランク軸方
向の変形、操縦側と非操縦側との上下変形量の差に因っ
てシリンダブロックが操縦側に凸となる変形等が、目立
っていた。However, if the wall is thinned unnecessarily, the rigidity of the cylinder block with respect to the mechanical load is reduced, and as a result, the cylinder block is deformed during operation, causing the engine to stop and vibrate. Problems such as increase and damage may occur. In particular, deformation of the main bearing cap in the vertical direction, deformation of the main bearing cap in the crankshaft direction, deformation of the cylinder block protruding to the control side due to the difference in the amount of vertical deformation between the control side and the non-control side, etc. Was outstanding.
【０００４】本発明は、軽量化に伴う剛性低下を抑制で
き、シリンダブロックの種々の変形を抑制できる、シリ
ンダブロック高剛性構造を提供することを目的とする。An object of the present invention is to provide a cylinder block high rigidity structure capable of suppressing a reduction in rigidity due to weight reduction and suppressing various deformations of the cylinder block.
【０００５】[0005]
【課題を解決するための手段】請求項１記載の発明は、
シリンダブロックにおいて、次の(1)〜(3)の構造の内の
少なくとも２つを採用したことを特徴とするシリンダブ
ロック高剛性構造。 (1)主軸受回りの上部隔壁の内、少なくとも主軸受ボル
トボス部の剛性を、主軸受回りの上部隔壁の内の他の隔
壁に比して高めた。 (2)主軸受回りの隔壁の内、主軸受キャップ合わせ面か
らオイルパン合わせ面にかけての隔壁の剛性を、主軸受
回りの隔壁の内の他の隔壁に比して高めた。 (3)シリンダ部の操縦側の剛性を高めて、カム室及びそ
れを支持するリブを備えたシリンダ部の非操縦側の剛性
と同等とした。According to the first aspect of the present invention,
A high rigidity structure of a cylinder block, wherein at least two of the following structures (1) to (3) are adopted in the cylinder block. (1) The rigidity of at least the main bearing bolt boss portion of the upper partition wall around the main bearing is increased as compared with the other partition walls of the upper partition wall around the main bearing. (2) Among the bulkheads around the main bearing, the rigidity of the bulkhead from the mating surface of the main bearing cap to the mating surface of the oil pan is increased as compared with other bulkheads around the main bearing. (3) The rigidity on the control side of the cylinder is increased to be equal to the rigidity on the non-control side of the cylinder provided with the cam chamber and the rib supporting the cam chamber.
【０００６】まず、シリンダブロックにおいては、図１
における矢印に示すような下向きの機械的荷重がクラン
ク軸１から主軸受キャップに加わるため、図２における
矢印に示すように、主軸受キャップ２に上下方向の変形
が生じる。そこで、この変形と主軸受３回りの上部隔壁
との関係を調べた。即ち、主軸受３回りの上部隔壁を、
図２に示すように、外側隔壁Ａ、主軸受ボルトボス部
Ｂ、内側隔壁Ｃの３つの領域に分割し、各領域のみで主
軸受キャップ２を支持した場合における主軸受キャップ
２の上下方向変形量とジャーナル楕円変形比を求めた。
それによると、３つの場合を比較して両者が満足できる
低値であるのは、主軸受ボルトボス部Ｂのみで支持した
場合であった。即ち、３つの隔壁領域Ａ，Ｂ，Ｃの内、
主軸受キャップ２の上下方向の変形に最も影響する隔壁
領域は主軸受ボルトボス部Ｂであることがわかった。従
って、請求項１記載の発明において、構造(1)を採用し
て、主軸受ボルトボス部Ｂの剛性を他の隔壁Ａ，Ｃに比
して高めた場合には、主軸受キャップ２の上下方向の変
形が最も効果的に抑制される。なお、ジャーナル楕円変
形比は、次式で求めた。式中のｈ，ｖは図２に示す。 ジャーナル楕円変形比＝（｜水平方向成分ｈ｜＋｜垂直
方向成分ｖ｜）／ジャーナル径First, in the cylinder block, FIG.
2, a downward mechanical load is applied from the crankshaft 1 to the main bearing cap, so that the main bearing cap 2 is vertically deformed as shown by the arrow in FIG. Therefore, the relationship between this deformation and the upper partition around the main bearing 3 was examined. That is, the upper partition around the main bearing 3 is
As shown in FIG. 2, the vertical deformation amount of the main bearing cap 2 when the main bearing cap 2 is divided into three regions of the outer partition wall A, the main bearing bolt boss portion B, and the inner partition wall C, and the main bearing cap 2 is supported only in each region. And the journal elliptical deformation ratio were determined.
According to the results, the lower value satisfying both in comparison with the three cases was a case where the main bearing bolt boss B supported only. That is, of the three partition areas A, B, and C,
It was found that the partition wall region that most affected the vertical deformation of the main bearing cap 2 was the main bearing bolt boss portion B. Therefore, when the structure (1) is adopted and the rigidity of the main bearing bolt boss portion B is increased in comparison with the other partition walls A and C in the first aspect of the present invention, the vertical direction of the main bearing cap 2 is increased. Is most effectively suppressed. The journal elliptic deformation ratio was determined by the following equation. H and v in the equation are shown in FIG. Journal elliptical deformation ratio = (| horizontal component h | + | vertical component v |) / journal diameter
【０００７】また、シリンダブロックにおいては、図３
における矢印に示すようなクランク軸方向（図３の左右
方向）の機械的荷重がクランク軸１から主軸受キャップ
に加わるため、図４におけるＸ部分即ち主軸受３の周辺
部が奥（図４の紙面裏面側）へ凹むような変形即ち主軸
受キャップ２のクランク軸方向（図４の紙面に垂直な方
向）の変形が生じる。そこで、図５に示すように、主軸
受３回りの上部隔壁の内、主軸受キャップ２の上下方向
の変形に最も影響する隔壁領域である主軸受ボルトボス
部Ｂのみで主軸受キャップ２を支持した状態において、
主軸受キャップ２のクランク軸方向の変形と主軸受３回
りのリブ構造との関係を調べた。即ち、上向きリブＤ、
水平リブＥ、下向きリブＦの３つのリブをそれぞれ設
け、リブを設けない場合、上向きリブＤを設けた場合、
水平リブＥを設けた場合、下向きリブＦを設けた場合に
おける主軸受キャップ２のクランク軸方向変形量を求め
た。それによると、下向きリブＦを設けた場合が最も低
値であった。即ち、主軸受キャップ２のクランク軸方向
の変形に最も影響するリブ構造は下向きリブＦであるこ
とがわかった。従って、請求項１記載の発明において、
構造(2)を採用して、主軸受３回りの隔壁の内、主軸受
キャップ合わせ面からオイルパン合わせ面にかけての隔
壁の剛性、即ち下向きリブＦに相当する部分を含んだ隔
壁の剛性を、前記隔壁の内の他の隔壁に比して高めた場
合には、主軸受キャップ２のクランク軸方向の変形が効
果的に抑制される。In the cylinder block, FIG.
4 applies a mechanical load in the crankshaft direction (left-right direction in FIG. 3) from the crankshaft 1 to the main bearing cap. The main bearing cap 2 is deformed in the crankshaft direction (a direction perpendicular to the paper surface of FIG. 4) so as to be depressed toward the rear surface of the paper. Therefore, as shown in FIG. 5, the main bearing cap 2 is supported only by the main bearing bolt boss portion B, which is the partition region that most affects the vertical deformation of the main bearing cap 2 among the upper partition around the main bearing 3. In the state
The relationship between the deformation of the main bearing cap 2 in the crankshaft direction and the rib structure around the main bearing 3 was examined. That is, the upward rib D,
When three ribs, a horizontal rib E and a downward rib F, are provided, and no rib is provided, and when an upward rib D is provided,
The amount of deformation of the main bearing cap 2 in the crankshaft direction when the horizontal rib E was provided and when the downward rib F was provided was determined. The lowest value was obtained when the downward rib F was provided. That is, it was found that the rib structure that most affected the deformation of the main bearing cap 2 in the crankshaft direction was the downward rib F. Therefore, in the invention of claim 1,
By adopting the structure (2), the rigidity of the partition wall from the mating surface of the main bearing cap to the mating surface of the oil pan, that is, the rigidity of the partition wall including a portion corresponding to the downward rib F, among the partition walls around the main bearing 3, When the height is increased as compared with the other partition walls, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed.
【０００８】更に、シリンダブロックの各部において
は、加わる機械的荷重によって図６における矢印方向に
変形が生じる。そして、カム室８１及びそれを支持する
リブ８２が設けられているシリンダ部６２の非操縦側の
剛性がシリンダ部６２の操縦側の剛性より高いため、操
縦側の上下変形量が非操縦側より大きくなってシリンダ
ブロックが操縦側に凸となる変形が生じる。このこと
は、シリンダブロックの操縦側に凸となる変形と非操縦
側のカム室８１及びリブ８２との関係を調べたところ、
明らかであった。即ち、カム室８１及びリブ８２が共に
無い場合、カム室８１は有るがリブ８２が無い場合、カ
ム室８１及びリブ８２が共に有る場合の３つの場合につ
いて、操縦側と非操縦側との上下変形量の差を求めたと
ころ、３つの場合を比較して前記差が最小であるのは、
カム室８１及びリブ８２が共に無い場合であった。これ
は、シリンダブロックの操縦側に凸となる変形に対して
は、非操縦側のカム室８１及びリブ８２が大きく影響し
ていることを示している。ところで、カム室８１及びリ
ブ８２を共に無くすことは不可能である。そこで、シリ
ンダ部６２の操縦側の剛性を、カム室８１及びリブ８２
が設けられているシリンダ部６２の非操縦側の剛性と同
等とすることを考えた。従って、請求項１記載の発明に
おいて、構造(3)を採用して、シリンダ部６２の操縦側
の剛性を高めてシリンダ部６２の非操縦側の剛性と同等
とした場合には、操縦側の上下変形量と非操縦側の上下
変形量とが同等となり、シリンダブロックの操縦側に凸
となる変形が効果的に抑制される。Further, each part of the cylinder block is deformed in the direction of the arrow in FIG. 6 by the applied mechanical load. Since the rigidity on the non-steering side of the cylinder portion 62 provided with the cam chamber 81 and the rib 82 supporting the cam chamber 81 is higher than the rigidity on the steering side of the cylinder portion 62, the amount of vertical deformation on the steering side is greater than that on the non-steering side. As the cylinder block becomes larger, a deformation occurs in which the cylinder block becomes convex on the steering side. This was confirmed by examining the relationship between the deformation of the cylinder block that became convex on the control side and the cam chamber 81 and rib 82 on the non-control side.
It was clear. That is, in the three cases where the cam chamber 81 and the rib 82 are not provided, the case where the cam chamber 81 is provided but the rib 82 is not provided, and the case where the cam chamber 81 and the rib 82 are provided together, When the difference in the amount of deformation was determined, the difference between the three cases was the smallest,
This is the case where neither the cam chamber 81 nor the rib 82 is provided. This indicates that the cam chamber 81 and the rib 82 on the non-steering side have a great influence on the deformation of the cylinder block that is convex on the steering side. By the way, it is impossible to eliminate both the cam chamber 81 and the rib 82. Therefore, the rigidity of the cylinder portion 62 on the control side is reduced by the cam chamber 81 and the rib 82.
Is considered to be equivalent to the rigidity on the non-steering side of the cylinder portion 62 provided with. Therefore, in the first aspect of the present invention, when the structure (3) is adopted to increase the rigidity of the cylinder portion 62 on the control side to be equal to the rigidity of the cylinder portion 62 on the non-control side, The vertical deformation amount is equal to the vertical deformation amount on the non-steering side, and the deformation of the cylinder block that is convex on the steering side is effectively suppressed.
【０００９】以上のように、請求項１記載の発明におい
ては、構造(1)〜(3)の内の少なくとも２つを採用するの
で、主軸受キャップ２の上下方向の変形、主軸受キャッ
プ２のクランク軸方向の変形、シリンダブロックが操縦
側に凸となる変形の内の少なくとも２つが効果的に抑制
される。As described above, in the first aspect of the present invention, since at least two of the structures (1) to (3) are employed, the deformation of the main bearing cap 2 in the vertical direction, At least two of the deformation in the crankshaft direction and the deformation in which the cylinder block is convex on the steering side are effectively suppressed.
【００１０】請求項２記載の発明は、請求項１記載の発
明において、前記構造(1)を採用した場合において、主
軸受回りで主軸受ボルトボス部の外側の隔壁の内、ロア
デッキから主軸受キャップ合わせ面にかけての隔壁の剛
性を、前記外側の隔壁の内の他の隔壁に比して高めたも
のである。According to a second aspect of the present invention, in the first aspect of the present invention, when the structure (1) is employed, the main bearing cap is disposed between the lower deck and the lower deck around the main bearing and outside the main bearing bolt boss portion. The rigidity of the partition wall over the mating surface is increased as compared with the other partition walls of the outer partition wall.
【００１１】主軸受キャップ２の上下方向の変形と主軸
受３回りのリブ構造との関係を調べた。即ち、図７に示
すように、主軸受ボルトボス部Ｂのみで主軸受キャップ
２を支持した状態で、上向きリブＤ、水平リブＥ、下向
きリブＦの３つのリブをそれぞれ設け、リブを設けない
場合、上向きリブＤを設けた場合、水平リブＥを設けた
場合、下向きリブＦを設けた場合における主軸受キャッ
プ２の上下方向変形量とジャーナル楕円変形比を求め
た。それによると、４つの場合を比較して両者が満足で
きる低値であるのは、上向きリブＤを設けた場合であっ
た。即ち、主軸受キャップ２の上下方向の変形に最も影
響するリブ構造は上向きリブＤであることがわかった。
これに基づき、請求項２記載の発明では、主軸受３回り
で主軸受ボルトボス部Ｂの外側の隔壁の内、ロアデッキ
から主軸受キャップ合わせ面にかけての隔壁、即ち上向
きリブＤに相当する部分を含んだ隔壁の剛性を、前記外
側の隔壁の内の他の隔壁に比して高めたので、主軸受キ
ャップ２の上下方向の変形が更に効果的に抑制される。The relationship between the vertical deformation of the main bearing cap 2 and the rib structure around the main bearing 3 was examined. That is, as shown in FIG. 7, in a state where the main bearing cap 2 is supported only by the main bearing bolt boss B, three ribs of the upward rib D, the horizontal rib E, and the downward rib F are provided, and no rib is provided. The vertical deformation amount and the journal elliptical deformation ratio of the main bearing cap 2 when the upward rib D was provided, when the horizontal rib E was provided, and when the downward rib F was provided were obtained. According to the results, the case where the upward rib D is provided is a low value that can satisfy both of the four cases. That is, it was found that the rib structure that most affected the vertical deformation of the main bearing cap 2 was the upward rib D.
On the basis of this, the invention according to claim 2 includes a partition from the lower deck to the main bearing cap mating surface, that is, a portion corresponding to the upward rib D, of the partition around the main bearing 3 and outside the main bearing bolt boss portion B. Since the rigidity of the partition wall is increased as compared with the other partition walls of the outer partition wall, the deformation of the main bearing cap 2 in the vertical direction is more effectively suppressed.
【００１２】請求項３記載の発明は、請求項１記載の発
明において、前記構造(1)を採用した場合において、主
軸受回りで主軸受ボルトボス部の外側の隔壁の内、ロア
デッキから主軸受キャップ合わせ面にかけての隔壁であ
って、主軸受キャップ合わせ面から上向き４５度以上の
隔壁の剛性を、前記外側の隔壁の内の他の隔壁に比して
高めたものである。According to a third aspect of the present invention, in the first aspect of the present invention, when the structure (1) is employed, the main bearing cap is disposed between the lower deck and the lower deck around the main bearing and outside the main bearing bolt boss portion. The partition wall extending over the mating surface, wherein the rigidity of the partition wall upward by 45 degrees or more from the main bearing cap mating surface is increased as compared with the other partition walls among the outer partition walls.
【００１３】請求項３記載の発明においても、上向きリ
ブＤに実質的に相当する箇所の隔壁の剛性が高められて
いるので、請求項２記載の発明と同様に、主軸受キャッ
プ２の上下方向の変形が更に効果的に抑制される。しか
も、剛性を高める隔壁の領域が請求項２の場合より小さ
いので、肉厚を調節して剛性を高める場合には厚肉化す
る隔壁の領域が請求項２の場合より小さくなり、それ故
に、請求項２の場合より軽量化が図られる。Also in the third aspect of the invention, the rigidity of the partition wall substantially corresponding to the upward rib D is increased, so that the vertical direction of the main bearing cap 2 is the same as in the second aspect of the invention. Is more effectively suppressed. Moreover, since the area of the partition wall for increasing the rigidity is smaller than that of the second aspect, when the thickness is adjusted to increase the rigidity, the area of the partition wall to be thickened is smaller than that of the second aspect. Weight reduction is achieved compared to the case of claim 2.
【００１４】請求項４記載の発明は、請求項１記載の発
明において、前記構造(3)を採用した場合において、シ
リンダ部の操縦側の外壁に、トップデッキからスカート
部上部に至る上下方向のリブを設け、これによって剛性
を高めたものである。According to a fourth aspect of the present invention, in the first aspect of the invention, when the structure (3) is adopted, the vertical wall extending from the top deck to the upper part of the skirt portion is provided on the outer wall on the steering side of the cylinder portion. Ribs are provided to increase rigidity.
【００１５】請求項４記載の発明においては、リブによ
って剛性が高められるので、製造作業が容易である。According to the fourth aspect of the invention, the rigidity is enhanced by the ribs, so that the manufacturing operation is easy.
【００１６】請求項５記載の発明は、請求項１記載の発
明において、少なくとも前記構造(1)及び(3)を採用した
場合において、シリンダ部の操縦側の外壁に、トップデ
ッキからスカート部上部に至る上下方向のリブを設け、
これによって前記構造(3)における剛性を高め、該リブ
に繋げて操縦側の主軸受ボルトボス部を通って主軸受キ
ャップ合わせ面まで至るリブを設けるとともに、非操縦
側の主軸受ボルトボス部を通って主軸受キャップ合わせ
面まで至るリブを設け、これによって前記(1)における
剛性を高めたものである。According to a fifth aspect of the present invention, in the first aspect of the invention, when at least the structures (1) and (3) are adopted, the outer wall on the steering side of the cylinder portion is provided from the top deck to the upper portion of the skirt portion. Up and down ribs
This increases the rigidity of the structure (3), and provides a rib connected to the rib and extending to the mating surface of the main bearing cap through the main bearing bolt boss on the steering side, and through the main bearing bolt boss on the non-control side through the main bearing bolt boss. A rib extending to the main bearing cap mating surface is provided, thereby increasing the rigidity in the above (1).
【００１７】請求項５記載の発明においては、リブを形
成するだけで、前記構造(1)及び(3)を実現できるので、
製造作業が容易である。According to the fifth aspect of the present invention, the structures (1) and (3) can be realized only by forming the ribs.
Manufacturing work is easy.
【００１８】請求項６記載の発明は、請求項１記載の発
明において、前記構造(1)又は(2)を採用した場合におい
て、肉厚を調節することによって剛性を高めたものであ
る。According to a sixth aspect of the present invention, in the first aspect of the invention, when the structure (1) or (2) is adopted, the rigidity is increased by adjusting the thickness.
【００１９】請求項６記載の発明においては、肉厚の調
節によって剛性が高められるので、製造作業が容易であ
る。According to the sixth aspect of the present invention, since the rigidity is increased by adjusting the thickness, the manufacturing operation is easy.
【００２０】請求項７記載の発明は、請求項２又は３に
記載の発明において、前記構造(1)を採用した場合にお
いて、主軸受ボルトボス部の肉厚の０．５〜１．０倍の
肉厚とすることによって剛性を高めたものである。According to a seventh aspect of the present invention, when the structure (1) is employed in the second or third aspect, the thickness of the main bearing bolt boss is 0.5 to 1.0 times the wall thickness. The rigidity is enhanced by increasing the wall thickness.
【００２１】請求項７記載の発明においては、０．５倍
以上であるので、剛性は高くなり、１．０倍以下である
ので、軽量化も図られる。In the present invention, the rigidity is increased by 0.5 times or more, and the weight is reduced by 1.0 times or less.
【００２２】請求項８記載の発明は、請求項１記載の発
明において、前記構造(2)を採用した場合において、主
軸受キャップの肉厚の０．５〜１．０倍の肉厚とするこ
とによって剛性を高めたものである。According to an eighth aspect of the present invention, when the structure (2) is adopted in the first aspect, the thickness of the main bearing cap is 0.5 to 1.0 times the thickness of the main bearing cap. This increases the rigidity.
【００２３】請求項８記載の発明においては、０．５倍
以上であるので、剛性は高くなり、１．０倍以下である
ので、軽量化も図られる。According to the eighth aspect of the present invention, the rigidity is increased because it is 0.5 times or more, and the weight is reduced because it is 1.0 times or less.
【００２４】請求項９記載の発明は、請求項１記載の発
明において、前記構造(1)又は(2)を採用した場合におい
て、前記他の隔壁の構成材料よりヤング率の高い材料を
鋳込むことによって剛性を高めたものである。According to a ninth aspect of the present invention, in the first aspect of the present invention, when the structure (1) or (2) is employed, a material having a higher Young's modulus than the constituent material of the other partition wall is cast. This increases the rigidity.
【００２５】請求項９記載の発明においては、隔壁の構
成材料を変質させることによって剛性が高められるの
で、肉厚を調節することによって剛性を高める場合に比
して、軽量化が図られる。According to the ninth aspect of the present invention, since the rigidity is increased by altering the material of the partition wall, the weight can be reduced as compared with the case where the rigidity is increased by adjusting the wall thickness.
【００２６】請求項１０記載の発明は、請求項１記載の
発明において、前記構造(3)を採用した場合において、
シリンダ部の操縦側のトップデッキからスカート部上部
に至る壁部に、シリンダ部の他の部分の構成材料よりヤ
ング率の高い材料を鋳込むことによって剛性を高めたも
のである。According to a tenth aspect of the present invention, when the structure (3) is adopted in the first aspect,
The rigidity is increased by casting a material having a higher Young's modulus than the constituent material of the other parts of the cylinder portion into a wall portion extending from the top deck on the operation side of the cylinder portion to the upper portion of the skirt portion.
【００２７】なお、請求項９及び１０に記載の発明にお
いて、ヤング率の高い材料は、母材よりヤング率が高い
材料であり、例えば母材がＦＣ材の場合ではＦＣＤやＳ
ＵＳを用いる。In the inventions according to the ninth and tenth aspects, the material having a higher Young's modulus is a material having a higher Young's modulus than the base material. For example, when the base material is an FC material, FCD or SCD is used.
US is used.
【００２８】請求項１０記載の発明においては、シリン
ダ部の構成材料を変質させることによって剛性が高めら
れるので、リブを設けることによって剛性を高める場合
に比して、軽量化が図られる。According to the tenth aspect of the present invention, since the rigidity is increased by altering the constituent material of the cylinder portion, the weight can be reduced as compared with the case where the rigidity is increased by providing the ribs.
【００２９】請求項１１記載の発明は、請求項１記載の
発明において、前記構造(1)又は(2)を採用した場合にお
いて、前記他の隔壁の肉厚を、鋳物としての最低の肉厚
としたものである。According to an eleventh aspect of the present invention, when the structure (1) or (2) is adopted in the first aspect, the thickness of the other partition wall is set to a minimum thickness as a casting. It is what it was.
【００３０】請求項１１記載の発明においては、シリン
ダブロックの変形を抑制しながら、最大の軽量化が図ら
れる。According to the eleventh aspect of the invention, the maximum weight reduction is achieved while suppressing deformation of the cylinder block.
【００３１】[0031]
【発明の実施の形態】（実施形態１）図８は本実施形態
のシリンダブロック１０の横断面略図である。図におい
て、２は主軸受キャップ、３は主軸受、４はロアデッ
キ、５は主軸受キャップ合わせ面、６１はスカート部、
６２はシリンダ部、７はオイルパン合わせ面、８１はカ
ム室、８２はカム室８１を支持するリブ、９はトップデ
ッキである。また、カム室８１のある側が非操縦側、そ
の反対側が操縦側である。(Embodiment 1) FIG. 8 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. In the figure, 2 is a main bearing cap, 3 is a main bearing, 4 is a lower deck, 5 is a main bearing cap mating surface, 61 is a skirt portion,
62 is a cylinder portion, 7 is an oil pan mating surface, 81 is a cam chamber, 82 is a rib for supporting the cam chamber 81, and 9 is a top deck. The side with the cam chamber 81 is the non-control side, and the opposite side is the control side.
【００３２】本実施形態では、主軸受３回りの隔壁の
内、主軸受ボルトボス部Ｂのボス部隔壁１１と、外側隔
壁１２の内の主軸受キャップ合わせ面５からオイルパン
合わせ面７にかけての外側下部隔壁１２２の各剛性を、
外側隔壁１２の内のロアデッキ４から主軸受キャップ合
わせ面５にかけての外側上部隔壁１２１及び内側隔壁１
３に比して高めている。具体的には、外側上部隔壁１２
１及び内側隔壁１３の各肉厚を鋳物として最低の肉厚と
し、ボス部隔壁１１及び外側下部隔壁１２２の各肉厚を
それより厚くするとともに、外側下部隔壁１２２の肉厚
を主軸受キャップ２の肉厚の０．５〜１．０倍とした。In this embodiment, of the bulkheads around the main bearing 3, the boss partition walls 11 of the main bearing bolt bosses B and the outer walls 12 of the outer partition walls 12 from the main bearing cap mating surface 5 to the oil pan mating surface 7. Each rigidity of the lower partition 122 is
The outer upper partition 121 and the inner partition 1 from the lower deck 4 of the outer partition 12 to the main bearing cap mating surface 5.
It is higher than 3. Specifically, the outer upper partition 12
The thickness of each of the boss partition wall 11 and the outer lower partition wall 122 is made larger than that of the main bearing cap 2 and the thickness of the outer lower partition wall 122. 0.5 to 1.0 times the wall thickness of
【００３３】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保したので、主軸受キャップ２の上
下方向の変形が効果的に抑制され、しかも、主軸受キャ
ップ２のクランク軸方向の変形に最も影響する下向きリ
ブ構造（図５）に相当する部分を含んだ外側下部隔壁１
２２の剛性を確保したので、主軸受キャップ２のクラン
ク軸方向の変形が効果的に抑制される。即ち、主軸受キ
ャップ２の上下方向の変形及び同じくクランク軸方向の
変形が共に抑制される。更に、外側上部隔壁１２１及び
内側隔壁１３の肉厚を鋳物として最低の肉厚としたの
で、前記両変形を効果的に抑制しながら、最大の軽量化
が図られる。In the cylinder block 10 having the above structure, the rigidity of the boss partition wall 11, which most affects the vertical deformation of the main bearing cap 2, is ensured, so that the vertical deformation of the main bearing cap 2 is effectively suppressed. Moreover, the outer lower partition wall 1 including a portion corresponding to the downward rib structure (FIG. 5) that most affects the deformation of the main bearing cap 2 in the crankshaft direction.
Since the rigidity of the main bearing cap 22 is ensured, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed. That is, both the vertical deformation of the main bearing cap 2 and the deformation in the crankshaft direction are suppressed. Further, since the outer upper partition wall 121 and the inner partition wall 13 have the minimum thickness as a casting, the above-described deformation is effectively suppressed, and the maximum weight reduction is achieved.
【００３４】（実施形態２）図９は本実施形態のシリン
ダブロック１０の横断面略図である。図９において、図
８と同一符号は同じ又は相当するものを示す。本実施形
態では、ボス部隔壁１１と、外側隔壁１２全体即ち外側
上部隔壁１２１及び外側下部隔壁１２２の各剛性を、内
側隔壁１３に比して高めている。具体的には、内側隔壁
１３の肉厚を鋳物として最低の肉厚とし、ボス部隔壁１
１、外側上部隔壁１２１、及び外側下部隔壁１２２の各
肉厚をそれより厚くするとともに、外側上部隔壁１２１
の肉厚をボス部隔壁１１の肉厚の０．５〜１．０倍と
し、且つ外側下部隔壁１２２の肉厚を主軸受キャップ２
の肉厚の０．５〜１．０倍とした。(Embodiment 2) FIG. 9 is a schematic cross-sectional view of a cylinder block 10 of this embodiment. 9, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the rigidity of the boss partition 11 and the entire outer partition 12, that is, the rigidity of each of the outer upper partition 121 and the outer lower partition 122 is higher than that of the inner partition 13. Specifically, the thickness of the inner partition 13 is set to the minimum thickness as a casting, and
1. The thickness of each of the outer upper partition wall 121 and the outer lower partition wall 122 is made larger than that of the outer upper partition wall 121 and the outer upper partition wall 121.
Is 0.5 to 1.0 times the thickness of the boss partition 11, and the thickness of the outer lower partition 122 is the main bearing cap 2.
0.5 to 1.0 times the wall thickness of
【００３５】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造（図
７）に相当する部分を含んだ外側上部隔壁１２１の剛性
も確保したので、主軸受キャップ２の上下方向の変形が
実施形態１の場合に比してより効果的に抑制され、しか
も、主軸受キャップ２のクランク軸方向の変形に最も影
響する下向きリブ構造に相当する部分を含んだ外側下部
隔壁１２２の剛性を確保したので、主軸受キャップ２の
クランク軸方向の変形が効果的に抑制される。即ち、主
軸受キャップ２の上下方向の変形及び同じくクランク軸
方向の変形が共に抑制される。更に、内側隔壁１３の肉
厚を鋳物として最低の肉厚としたので、前記両変形を効
果的に抑制しながら、最大の軽量化が図られる。In the cylinder block 10 having the above structure, not only the rigidity of the boss partition wall 11 which most affects the vertical deformation of the main bearing cap 2 but also the vertical bearing deformation of the main bearing cap 2 is most affected. Since the rigidity of the outer upper partition wall 121 including the portion corresponding to the upward rib structure (FIG. 7) is also secured, the deformation of the main bearing cap 2 in the vertical direction is more effectively suppressed as compared with the first embodiment. In addition, since the rigidity of the outer lower partition wall 122 including the portion corresponding to the downward rib structure that most affects the deformation of the main bearing cap 2 in the crankshaft direction is secured, the deformation of the main bearing cap 2 in the crankshaft direction is effective. Is suppressed. That is, both the vertical deformation of the main bearing cap 2 and the deformation in the crankshaft direction are suppressed. Further, since the thickness of the inner partition wall 13 is set to the minimum thickness as a casting, the maximum weight reduction can be achieved while effectively suppressing the above-mentioned deformations.
【００３６】（実施形態３）図１０は本実施形態のシリ
ンダブロック１０の横断面略図である。図１０におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、ボス部隔壁１１と、外側上部隔壁１２１
であって主軸受キャップ合わせ面５から上向き４５度以
上の上部上半部隔壁１２１１と、外側下部隔壁１２２の
各剛性を、外側上部隔壁１２１であって主軸受キャップ
合わせ面５から上向き４５度未満の上部下半部隔壁１２
１２及び内側隔壁１３に比して高めている。具体的に
は、上部下半部隔壁１２１２及び内側隔壁１３の各肉厚
を鋳物として最低の肉厚とし、ボス部隔壁１１、上部上
半部隔壁１２１１、及び外側下部隔壁１２２の各肉厚を
それより厚くするとともに、上部上半部隔壁１２１１の
肉厚をボス部隔壁１１の肉厚の０．５〜１．０倍とし、
且つ外側下部隔壁１２２の肉厚を主軸受キャップ２の肉
厚の０．５〜１．０倍とした。(Embodiment 3) FIG. 10 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 10, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In this embodiment, the boss partition 11 and the outer upper partition 121 are provided.
The rigidity of the upper upper half partition 1211 and the outer lower partition 122 that is 45 degrees or more upward from the main bearing cap mating surface 5 and the outer upper partition 121 is less than 45 degrees upward from the main bearing cap mating surface 5. Upper lower half partition 12
12 and the inner partition wall 13. Specifically, each thickness of the upper lower half partition 1212 and the inner partition 13 is set to the minimum thickness as a casting, and each thickness of the boss partition 11, the upper upper half partition 1211 and the outer lower partition 122 is reduced. While making it thicker, the thickness of the upper upper half partition 1211 is set to 0.5 to 1.0 times the thickness of the boss partition 11,
The thickness of the outer lower partition wall 122 is set to 0.5 to 1.0 times the thickness of the main bearing cap 2.
【００３７】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造に相
当する部分を含んだ上部上半部隔壁１２１１の剛性も確
保したので、実施形態２と同様に主軸受キャップ２の上
下方向の変形がより効果的に抑制され、しかも、主軸受
キャップ２のクランク軸方向の変形に最も影響する外側
下部隔壁１２２の剛性を確保したので、主軸受キャップ
２のクランク軸方向の変形が効果的に抑制される。即
ち、主軸受キャップ２の上下方向の変形及び主軸受キャ
ップ２のクランク軸方向の変形が共に抑制される。更
に、上部下半部隔壁１２１２及び内側隔壁１３の各肉厚
を鋳物として最低の肉厚としたので、前記両変形を効果
的に抑制しながら、最大の軽量化が図られる。しかも、
上部上半部隔壁１２１１の領域は外側上部隔壁１２１よ
り小さいので、厚肉化する部分が実施形態２の場合より
少なく、その分だけ、実施形態２よりも軽量化が図られ
る。In the cylinder block 10 having the above structure, not only the rigidity of the boss partition wall 11, which most affects the vertical deformation of the main bearing cap 2, but also the vertical deformation of the main bearing cap 2 is most affected. Since the rigidity of the upper upper half partition 1211 including the portion corresponding to the upward rib structure is also ensured, the vertical deformation of the main bearing cap 2 is more effectively suppressed as in the second embodiment. Since the rigidity of the outer lower partition wall 122 that most affects the deformation of the cap 2 in the crankshaft direction is ensured, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed. That is, both the vertical deformation of the main bearing cap 2 and the deformation of the main bearing cap 2 in the crankshaft direction are suppressed. Furthermore, since the thickness of each of the upper and lower half partition walls 1212 and the inner partition wall 13 is set to the minimum thickness as a casting, maximum reduction in weight can be achieved while effectively suppressing both deformations. Moreover,
Since the region of the upper upper partition wall 1211 is smaller than the outer upper partition wall 121, the thickness of the portion is smaller than that of the second embodiment, and the weight is reduced by that much compared to the second embodiment.
【００３８】（実施形態４）本実施形態は、図１１に示
すように、実施形態１において、外側下部隔壁１２２全
体の剛性を高める代わりに、外側下部隔壁１２２の内側
周縁部１２２１のみの剛性を高め、その他は実施形態１
と同じとしたものである。具体的には、内側周縁部１２
２１の肉厚を主軸受キャップ２の肉厚の０．５〜１．０
倍とした。なお、外側下部隔壁１２２のその他の部分即
ち外側部１２２２の肉厚は鋳物として最低の肉厚とし
た。(Embodiment 4) In this embodiment, as shown in FIG. 11, instead of increasing the rigidity of the entire outer lower partition 122 in Embodiment 1, the rigidity of only the inner peripheral edge 1221 of the outer lower partition 122 is increased. High, others in the first embodiment
Is the same as Specifically, the inner peripheral portion 12
21 is 0.5 to 1.0 of the thickness of the main bearing cap 2.
Doubled. The thickness of the other portion of the outer lower partition wall 122, that is, the thickness of the outer portion 1222 was set to the minimum thickness as a casting.
【００３９】これによっても、主軸受キャップ２のクラ
ンク軸方向の変形に最も影響する下向きリブ構造に実質
的に相当する内側周縁部１２２１の剛性を確保したの
で、実施形態１と同様の作用効果が発揮される。しか
も、内側周縁部１２２１の領域は外側下部隔壁１２２よ
り小さいので、厚肉化する部分が実施形態１の場合より
少なく、その分だけ、実施形態１よりも軽量化が図られ
る。This also ensures the rigidity of the inner peripheral portion 1221 substantially corresponding to the downward rib structure that most affects the deformation of the main bearing cap 2 in the crankshaft direction. Be demonstrated. Moreover, since the area of the inner peripheral portion 1221 is smaller than the outer lower partition wall 122, the thickness of the portion is smaller than that of the first embodiment, and the weight is reduced by that much compared to the first embodiment.
【００４０】なお、外側下部隔壁１２２全体の代わりに
内側周縁部１２２１のみの剛性を高めるという前記構造
は、実施形態２，３においても適用できる。The above-described structure in which the rigidity of only the inner peripheral edge portion 1221 is increased instead of the entire outer lower partition wall 122 can be applied to the second and third embodiments.
【００４１】（実施形態５）本実施形態は、図１２に示
すように、実施形態３において、上部上半部隔壁１２１
１全体の剛性を高める代わりに、その下縁部１２１１ａ
のみの剛性を高め、外側下部隔壁１２２全体の剛性を高
める代わりに、その内側周縁部１２２１のみの剛性を高
め、その他は実施形態３と同じとしたものである。具体
的には、下縁部１２１１ａの肉厚をボス部隔壁１１の肉
厚の０．５〜１．０倍とし、内側周縁部１２２１の肉厚
を主軸受キャップ２の肉厚の０．５〜１．０倍とした。
なお、上部上半部隔壁１２１１のその他の部分即ち上側
部１２１１ｂ及び外側下部隔壁１２２の外側部１２２２
の各肉厚は鋳物として最低の肉厚とした。(Embodiment 5) In this embodiment, as shown in FIG.
1 Instead of increasing the overall rigidity, its lower edge 1211a
Instead of increasing the rigidity of only the outer lower partition wall 122 and the rigidity of the entire outer lower partition 122, the rigidity of only the inner peripheral edge portion 1221 is increased, and the other configuration is the same as that of the third embodiment. Specifically, the thickness of the lower edge portion 1211a is set to 0.5 to 1.0 times the thickness of the boss partition wall 11, and the thickness of the inner peripheral portion 1221 is set to 0.5 times the thickness of the main bearing cap 2. １．０1.0 times.
The other portions of the upper upper partition 1211, that is, the upper portion 1211 b and the outer portion 1222 of the outer lower partition 122.
Were made the minimum thickness as a casting.
【００４２】これによっても、主軸受キャップ２の上下
方向の変形に最も影響する上向きリブ構造に実質的に相
当する下縁部１２１１ａの剛性を確保し、また、主軸受
キャップ２のクランク軸方向の変形に最も影響する下向
きリブ構造に実質的に相当する内側周縁部１２２１の剛
性を確保したので、実施形態３と同様の作用効果が発揮
される。しかも、下縁部１２１１ａの領域は上部上半部
隔壁１２１１より小さく、また、内側周縁部１２２１の
領域は外側下部隔壁１２２より小さいので、厚肉化する
部分が実施形態３の場合より少なく、その分だけ、実施
形態３よりも軽量化が図られる。This also ensures the rigidity of the lower edge portion 1211a substantially corresponding to the upward rib structure that most affects the vertical deformation of the main bearing cap 2, and also allows the main bearing cap 2 to be moved in the crankshaft direction. Since the rigidity of the inner peripheral portion 1221 substantially corresponding to the downward rib structure that most affects the deformation is secured, the same operation and effect as in the third embodiment are exerted. Moreover, since the area of the lower edge 1211a is smaller than the upper upper partition 1211 and the area of the inner peripheral edge 1221 is smaller than the outer lower partition 122, the thickness of the portion is smaller than that of the third embodiment. For this reason, the weight can be reduced as compared with the third embodiment.
【００４３】なお、上部上半部隔壁１２１１全体の代わ
りに下縁部１２１１ａのみの剛性を高め、且つ外側下部
隔壁１２２全体の代わりに内側周縁部１２２１のみの剛
性を高めるという前記構造は、実施形態２においても適
用できる。The structure in which the rigidity of only the lower edge 1211a is increased instead of the entire upper upper half partition 1211 and the rigidity of only the inner peripheral edge 1221 is increased instead of the entire outer lower partition 122 is described in the embodiment. 2 can also be applied.
【００４４】（実施形態６）実施形態１〜５において、
剛性を高める隔壁の肉厚を調節することによってその隔
壁の剛性を高める代わりに、剛性を高める隔壁に、他の
隔壁の構成材料よりヤング率の高い材料を鋳込むことに
よって剛性を高めるようにしてもよい。ヤング率の高い
材料は、母材よりヤング率が高い材料であり、例えば母
材がＦＣ材の場合ではＦＣＤやＳＵＳを用いる。(Embodiment 6) In Embodiments 1 to 5,
Instead of increasing the rigidity of the bulkhead by adjusting the wall thickness of the bulkhead that increases the rigidity, the rigidity of the bulkhead is increased by casting a material having a higher Young's modulus than the constituent material of the other bulkheads. Is also good. The material having a higher Young's modulus is a material having a higher Young's modulus than the base material. For example, when the base material is an FC material, FCD or SUS is used.
【００４５】これによれば、実施形態１〜５と同様の作
用効果が発揮されるとともに、隔壁の構成材料を変質さ
せることによって剛性が高められるので、肉厚を調節す
ることによって剛性を高める実施形態１〜５の場合に比
して、軽量化が図られる。According to this, the same operation and effect as those of the first to fifth embodiments can be exhibited, and the rigidity can be increased by altering the constituent material of the partition walls. Therefore, the rigidity can be increased by adjusting the wall thickness. Weight reduction is achieved as compared with the cases of modes 1 to 5.
【００４６】（実施形態７）図１３は本実施形態のシリ
ンダブロック１０の横断面略図である。図１３におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、主軸受３回りの隔壁の内、主軸受ボルト
ボス部Ｂのボス部隔壁１１の剛性を、外側隔壁１２及び
内側隔壁１３に比して高めるとともに、シリンダ部６２
の操縦側の剛性を高めてシリンダ部６２の非操縦側の剛
性と同等としている。具体的には、外側隔壁１２及び内
側隔壁１３の各肉厚を鋳物として最低の肉厚とし、ボス
部隔壁１１の肉厚をそれより厚くするとともに、シリン
ダ部６２の操縦側の外壁にトップデッキ９からスカート
部６１上部に至るリブ１５を設けた。リブ１５は、ボア
間及びジャーナル間中心に、複数列設けられている。(Embodiment 7) FIG. 13 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 13, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the rigidity of the boss partition wall 11 of the main bearing bolt boss portion B of the partition wall around the main bearing 3 is increased as compared with the outer partition wall 12 and the inner partition wall 13, and the cylinder section 62.
The rigidity on the control side is increased to be equal to the rigidity on the non-control side of the cylinder portion 62. Specifically, the thickness of each of the outer partition wall 12 and the inner partition wall 13 is set to the minimum thickness as a casting, the thickness of the boss partition wall 11 is made larger than that, and the top deck is mounted on the outer wall of the cylinder section 62 on the control side. A rib 15 extending from 9 to the upper part of the skirt 61 is provided. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００４７】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保したので、主軸受キャップ２の上
下方向の変形が効果的に抑制され、しかも、リブ１５に
よってシリンダ部６２の操縦側の剛性を高めてシリンダ
部６２の非操縦側の剛性と同等としたので、シリンダブ
ロック１０の操縦側に凸となる変形が抑制される。即
ち、主軸受キャップ２の上下方向の変形及びシリンダブ
ロック１０の操縦側に凸となる変形が共に抑制される。
更に、外側隔壁１２及び内側隔壁１３の肉厚を鋳物とし
て最低の肉厚としたので、前記両変形を効果的に抑制し
ながら、最大の軽量化が図られる。In the cylinder block 10 having the above structure, the rigidity of the boss partition wall 11, which most affects the vertical deformation of the main bearing cap 2, is ensured, so that the vertical deformation of the main bearing cap 2 is effectively suppressed. In addition, since the rigidity of the cylinder portion 62 on the control side is increased by the ribs 15 to be equal to the rigidity of the cylinder portion 62 on the non-control side, deformation of the cylinder block 10 that is convex on the control side is suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction and the deformation of the cylinder block 10 that is convex on the steering side are both suppressed.
Furthermore, since the thickness of the outer partition 12 and the inner partition 13 is made the minimum thickness as a casting, the maximum weight reduction can be achieved while effectively suppressing both the deformations.
【００４８】（実施形態８）図１４は本実施形態のシリ
ンダブロック１０の横断面略図である。図１４におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、ボス部隔壁１１と、外側上部隔壁１２１
の各剛性を、外側下部隔壁１２２及び内側隔壁１３に比
して高めるとともに、シリンダ部６２の操縦側の剛性を
高めてシリンダ部６２の非操縦側の剛性と同等としてい
る。具体的には、外側下部隔壁１２２及び内側隔壁１３
の各肉厚を鋳物として最低の肉厚とし、ボス部隔壁１１
及び外側上部隔壁１２１の各肉厚をそれより厚くすると
ともに、外側上部隔壁１２１の肉厚をボス部隔壁１１の
肉厚の０．５〜１．０倍とし、更に、シリンダ部６２の
操縦側の外壁にトップデッキ９からスカート部６１上部
に至るリブ１５を設けた。リブ１５は、ボア間及びジャ
ーナル間中心に、複数列設けられている。(Eighth Embodiment) FIG. 14 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 14, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In this embodiment, the boss partition 11 and the outer upper partition 121 are provided.
Are increased in comparison with the outer lower partition wall 122 and the inner partition wall 13, and the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side. Specifically, the outer lower partition 122 and the inner partition 13
Of the boss partition 11
The thickness of the outer upper partition 121 is made larger than that, the thickness of the outer upper partition 121 is set to 0.5 to 1.0 times the thickness of the boss partition 11, and The ribs 15 extending from the top deck 9 to the upper part of the skirt portion 61 are provided on the outer wall of the. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００４９】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造に相
当する部分を含んだ外側上部隔壁１２１の剛性も確保す
るので、主軸受キャップ２の上下方向の変形が実施形態
７の場合に比してより効果的に抑制され、しかも、リブ
１５によってシリンダ部６２の操縦側の剛性を高めてシ
リンダ部６２の非操縦側の剛性と同等としたので、シリ
ンダブロック１０の操縦側に凸となる変形が抑制され
る。即ち、主軸受キャップ２の上下方向の変形及びシリ
ンダブロック１０の操縦側に凸となる変形が共に抑制さ
れる。更に、外側下部隔壁１２２及び内側隔壁１３の各
肉厚を鋳物として最低の肉厚としたので、前記両変形を
効果的に抑制しながら、最大の軽量化が図られる。In the cylinder block 10 having the above-described structure, not only the rigidity of the boss partition wall 11 which most affects the vertical deformation of the main bearing cap 2 is ensured, but also the vertical deformation of the main bearing cap 2 is most affected. Since the rigidity of the outer upper partition wall 121 including the portion corresponding to the upward rib structure is also ensured, the deformation of the main bearing cap 2 in the vertical direction is more effectively suppressed than in the case of the seventh embodiment. 15, the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side, so that deformation of the cylinder block 10 that is convex on the control side is suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction and the deformation of the cylinder block 10 that is convex on the steering side are both suppressed. Furthermore, since the thickness of each of the outer lower partition wall 122 and the inner partition wall 13 is set to the minimum thickness as a casting, maximum reduction in weight can be achieved while effectively suppressing both deformations.
【００５０】（実施形態９）図１５は本実施形態のシリ
ンダブロック１０の横断面略図である。図１５におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、ボス部隔壁１１と、上部上半部隔壁１２
１１の各剛性を、上部下半部隔壁１２１２、外側下部隔
壁１２２、及び内側隔壁１３に比して高めるとともに、
シリンダ部６２の操縦側の剛性を高めてシリンダ部６２
の非操縦側の剛性と同等としている。具体的には、上部
下半部隔壁１２１２、外側下部隔壁１２２、及び内側隔
壁１３の各肉厚を鋳物として最低の肉厚とし、ボス部隔
壁１１及び上部上半部隔壁１２１１の各肉厚をそれより
厚くするとともに、上部上半部隔壁１２１１の肉厚をボ
ス部隔壁１１の肉厚の０．５〜１．０倍とし、更に、シ
リンダ部６２の操縦側の外壁にトップデッキ９からスカ
ート部６１上部に至るリブ１５を設けた。リブ１５は、
ボア間及びジャーナル間中心に、複数列設けられてい
る。(Embodiment 9) FIG. 15 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 15, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the boss partition 11 and the upper upper half partition 12
11 while increasing the rigidity of each of the upper and lower halves 1212, the outer lower partition 122, and the inner partition 13,
By increasing the rigidity of the cylinder portion 62 on the control side,
The rigidity on the non-control side is the same. Specifically, each thickness of the upper lower half partition 1212, the outer lower partition 122, and the inner partition 13 is set to the minimum thickness as a casting, and the respective thicknesses of the boss partition 11 and the upper upper partition 1211 are reduced. The thickness of the upper upper partition 1211 is set to be 0.5 to 1.0 times the thickness of the boss partition 11, and the outer side wall of the cylinder portion 62 on the control side is further skirted from the top deck 9. The rib 15 reaching the upper part of the part 61 was provided. The rib 15
A plurality of rows are provided between the bores and between the journals.
【００５１】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造に実
質的に相当する上部上半部隔壁１２１１の剛性も確保す
るので、実施形態８と同様に主軸受キャップ２の上下方
向の変形がより効果的に抑制され、しかも、リブ１５に
よってシリンダ部６２の操縦側の剛性を高めてシリンダ
部６２の非操縦側の剛性と同等としたので、シリンダブ
ロック１０の操縦側に凸となる変形が抑制される。即
ち、主軸受キャップ２の上下方向の変形及びシリンダブ
ロック１０の操縦側に凸となる変形が共に抑制される。
更に、上部下半部隔壁１２１２、外側下部隔壁１２２、
及び内側隔壁１３の各肉厚を鋳物として最低の肉厚とし
たので、前記両変形を効果的に抑制しながら、最大の軽
量化が図られる。しかも、上部上半部隔壁１２１１の領
域は外側上部隔壁１２１より小さいので、厚肉化する部
分が実施形態８の場合より少なく、その分だけ、実施形
態８よりも軽量化が図られる。In the cylinder block 10 having the above-described structure, not only the rigidity of the boss partition wall 11, which most affects the vertical deformation of the main bearing cap 2, but also the vertical deformation of the main bearing cap 2 is most affected. Since the rigidity of the upper upper half partition wall 1211 substantially corresponding to the upward rib structure is also ensured, the vertical deformation of the main bearing cap 2 is more effectively suppressed as in the eighth embodiment. Since the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side, deformation of the cylinder block 10 that is convex on the control side is suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction and the deformation of the cylinder block 10 that is convex on the steering side are both suppressed.
Further, an upper lower half partition 1212, an outer lower partition 122,
In addition, since the thickness of each of the inner partition walls 13 is set to the minimum thickness as a casting, the maximum weight reduction can be achieved while effectively suppressing the above-mentioned deformations. In addition, since the region of the upper upper partition wall 1211 is smaller than the outer upper partition wall 121, the number of thickened portions is smaller than in the case of the eighth embodiment, and the weight is reduced as much as that of the eighth embodiment.
【００５２】（実施形態１０）図１６は本実施形態のシ
リンダブロック１０の横断面略図である。図１６におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、主軸受ボルトボス部Ｂの剛性を、外側隔
壁１２及び内側隔壁１３に比して高めるとともに、シリ
ンダ部６２の操縦側の剛性を高めてシリンダ部６２の非
操縦側の剛性と同等としている。具体的には、シリンダ
部６２の操縦側の外壁にトップデッキ９からスカート部
６１上部に至るリブ１５を設けるとともに、リブ１５に
繋げて、操縦側の主軸受ボルトボス部Ｂを通って主軸受
キャップ合わせ面５まで至るリブ１６１を設けた。リブ
１５は、ボア間及びジャーナル間中心に、複数列設けら
れており、リブ１６１と繋がっているリブ１５はジャー
ナル間中心に設けられたものである。また、非操縦側の
主軸受ボルトボス部Ｂにもリブ１６１と対称にリブ１６
２を設けた。更に、外側隔壁１２及び内側隔壁１３の各
肉厚を鋳物として最低の肉厚とした。(Embodiment 10) FIG. 16 is a schematic cross-sectional view of a cylinder block 10 of this embodiment. In FIG. 16, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the rigidity of the main bearing bolt boss portion B is increased as compared with the outer partition wall 12 and the inner partition wall 13, and the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side. And Specifically, a rib 15 extending from the top deck 9 to the upper part of the skirt portion 61 is provided on the outer wall on the control side of the cylinder portion 62, and is connected to the rib 15 so as to pass through the main bearing bolt boss B on the control side and pass the main bearing cap. A rib 161 reaching the mating surface 5 was provided. The ribs 15 are provided in a plurality of rows at the center between the bores and between the journals, and the ribs 15 connected to the ribs 161 are provided at the center between the journals. Also, the ribs 16 are provided symmetrically with the rib 161 on the main bearing bolt boss portion B on the non-steering side.
2 were provided. Further, the thickness of each of the outer partition wall 12 and the inner partition wall 13 was set to the minimum thickness as a casting.
【００５３】上記構造のシリンダブロック１０では、リ
ブ１５によってシリンダ部６２の操縦側の剛性を高めて
シリンダ部６２の非操縦側の剛性と同等としたので、シ
リンダブロック１０の操縦側に凸となる変形が抑制さ
れ、しかも、主軸受キャップ２の上下方向の変形に最も
影響する主軸受ボルトボス部Ｂの剛性をリブ１６１，１
６２によって確保したので、主軸受キャップ２の上下方
向の変形が効果的に抑制される。即ち、シリンダブロッ
ク１０の操縦側に凸となる変形及び主軸受キャップ２の
上下方向の変形が共に抑制される。更に、外側隔壁１２
及び内側隔壁１３の各肉厚を鋳物として最低の肉厚とし
たので、前記両変形を効果的に抑制しながら、最大の軽
量化が図られる。しかも、リブ１５とリブ１６１とが繋
がって形成されるので、製造作業が容易である。In the cylinder block 10 having the above-described structure, the rigidity of the cylinder portion 62 on the control side is increased by the ribs 15 to be equal to the rigidity of the cylinder portion 62 on the non-control side. Deformation is suppressed, and the rigidity of the main bearing bolt boss portion B, which most affects the vertical deformation of the main bearing cap 2, is reduced by the ribs 161,1.
62, the deformation of the main bearing cap 2 in the vertical direction is effectively suppressed. That is, both the deformation of the cylinder block 10 that is convex on the steering side and the deformation of the main bearing cap 2 in the vertical direction are suppressed. Further, the outer partition 12
In addition, since the thickness of each of the inner partition walls 13 is set to the minimum thickness as a casting, the maximum weight reduction can be achieved while effectively suppressing the above-mentioned deformations. Moreover, since the ribs 15 and the ribs 161 are formed so as to be connected, the manufacturing operation is easy.
【００５４】（実施形態１１）本実施形態は、図１７に
示すように、実施形態７において、リブ１５を設けるこ
とによって剛性を高める代わりに、シリンダ部６２の操
縦側のトップデッキ９からスカート部６１上部に至る壁
部１７に、シリンダ部６２の他の部分の構成材料よりヤ
ング率の高い材料を鋳込むことによって剛性を高め、ボ
ス部隔壁１１の肉厚を調節することによって剛性を高め
る代わりに、ボス部隔壁１１に、主軸受３回りの他の隔
壁１２，１３の構成材料よりヤング率の高い材料を鋳込
むことによって剛性を高めたものである。ヤング率の高
い材料は、母材よりヤング率が高い材料であり、例えば
母材がＦＣ材の場合ではＦＣＤやＳＵＳを用いる。(Embodiment 11) In this embodiment, as shown in FIG. 17, instead of increasing the rigidity by providing the ribs 15 in the embodiment 7, instead of increasing the stiffness from the top deck 9 on the control side of the cylinder portion 62, Instead of increasing the rigidity by casting a material having a higher Young's modulus than the constituent material of the other part of the cylinder portion 62 into the wall portion 17 reaching the upper portion, and increasing the rigidity by adjusting the thickness of the boss portion partition wall 11. The rigidity is increased by casting a material having a higher Young's modulus than the constituent material of the other partitions 12 and 13 around the main bearing 3 into the boss partition 11. The material having a higher Young's modulus is a material having a higher Young's modulus than the base material. For example, when the base material is an FC material, FCD or SUS is used.
【００５５】これによれば、実施形態７と同様の作用効
果が発揮されるとともに、隔壁の構成材料を変質させる
ことによって剛性が高められるので、肉厚を調節するこ
とによって剛性を高める実施形態７の場合に比して、軽
量化が図られる。According to this, the same operation and effect as those of the seventh embodiment are exhibited, and the rigidity is enhanced by altering the constituent material of the partition walls. Therefore, the rigidity is enhanced by adjusting the wall thickness. Lightening is achieved as compared with the case of
【００５６】なお、ヤング率の高い材料を鋳込むことに
よって剛性を高めるという前記構造は、実施形態８，９
においても適用できる。The structure in which the rigidity is increased by casting a material having a high Young's modulus is described in the eighth and ninth embodiments.
Can be applied to
【００５７】（実施形態１２）図１８は本実施形態のシ
リンダブロック１０の横断面略図である。図１８におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、外側隔壁１２の内の外側下部隔壁１２２
の剛性を、ボス部隔壁１１、外側上部隔壁１２１、及び
内側隔壁１３に比して高めるとともに、シリンダ部６２
の操縦側の剛性を高めてシリンダ部６２の非操縦側の剛
性と同等としている。具体的には、ボス部隔壁１１、外
側上部隔壁１２１、及び内側隔壁１３の各肉厚を鋳物と
して最低の肉厚とし、外側下部隔壁１２２の肉厚をそれ
より厚くし且つ主軸受キャップ２の肉厚の０．５〜１．
０倍とし、更に、シリンダ部６２の操縦側の外壁にトッ
プデッキ９からスカート部６１上部に至るリブ１５を設
けた。リブ１５は、ボア間及びジャーナル間中心に、複
数列設けられている。(Embodiment 12) FIG. 18 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 18, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the outer lower partition 122 of the outer partition 12 is used.
The rigidity of the cylinder portion 62 is increased as compared with the boss portion partition wall 11, the outer upper partition wall 121, and the inner partition wall 13.
The rigidity on the control side is increased to be equal to the rigidity on the non-control side of the cylinder portion 62. Specifically, the thickness of each of the boss partition wall 11, the outer upper partition wall 121, and the inner partition wall 13 is set to the minimum thickness as a casting, the thickness of the outer lower partition wall 122 is made larger than that, and the thickness of the main bearing cap 2 is increased. 0.5-1.
The rib 15 is provided on the outer wall on the control side of the cylinder part 62 and extends from the top deck 9 to the upper part of the skirt part 61. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００５８】上記構造のシリンダブロック１０では、主
軸受キャップ２のクランク軸方向の変形に最も影響する
下向きリブ構造に相当する部分を含んだ外側下部隔壁１
２２の剛性を確保したので、主軸受キャップ２のクラン
ク軸方向の変形が効果的に抑制され、しかも、リブ１５
によってシリンダ部６２の操縦側の剛性を高めてシリン
ダ部６２の非操縦側の剛性と同等としたので、シリンダ
ブロック１０の操縦側に凸となる変形が抑制される。即
ち、即ち、主軸受キャップ２のクランク軸方向の変形及
びシリンダブロック１０の操縦側に凸となる変形が共に
抑制される。更に、ボス部隔壁１１、外側上部隔壁１２
１、及び内側隔壁１３の各肉厚を鋳物として最低の肉厚
としたので、前記両変形を効果的に抑制しながら、最大
の軽量化が図られる。In the cylinder block 10 having the above structure, the outer lower partition wall 1 includes a portion corresponding to the downward rib structure which most affects the deformation of the main bearing cap 2 in the crankshaft direction.
22, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed, and the ribs 15
As a result, the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side, so that deformation of the cylinder block 10 that is convex on the control side is suppressed. That is, both the deformation of the main bearing cap 2 in the crankshaft direction and the deformation of the cylinder block 10 protruding toward the steering side are suppressed. Further, the boss partition 11 and the outer upper partition 12
Since the thickness of each of the first and inner partition walls 13 is set to the minimum thickness as a casting, the maximum reduction in weight can be achieved while effectively suppressing the above-mentioned deformations.
【００５９】（実施形態１３）本実施形態は、図１９に
示すように、実施形態１２において、外側下部隔壁１２
２全体の剛性を高める代わりに、外側下部隔壁１２２の
内側周縁部１２２１のみの剛性を高め、その他は実施形
態１２と同じとしたものである。具体的には、内側周縁
部１２２１の肉厚を主軸受キャップ２の肉厚の０．５〜
１．０倍とした。なお、外側下部隔壁１２２の外側部１
２２２の肉厚は鋳物として最低の肉厚とした。(Embodiment 13) As shown in FIG. 19, this embodiment differs from Embodiment 12 in that
Instead of increasing the overall rigidity, the rigidity of only the inner peripheral edge 1221 of the outer lower partition wall 122 is increased, and the other components are the same as in the twelfth embodiment. Specifically, the thickness of the inner peripheral portion 1221 is set to 0.5 to the thickness of the main bearing cap 2.
1.0 times. The outer portion 1 of the outer lower partition 122
The thickness of 222 was the minimum thickness as a casting.
【００６０】これによっても、実施形態１２と同様の作
用効果が発揮されるとともに、主軸受キャップ２のクラ
ンク軸方向の変形に最も影響する下向きリブ構造に実質
的に相当する内側周縁部１２２１の剛性を確保したの
で、実施形態１２と同様の作用効果が発揮される。しか
も、内側周縁部１２２１の領域は外側下部隔壁１２２よ
り小さいので、厚肉化する部分が実施形態１２の場合よ
り少なく、その分だけ、実施形態１２よりも軽量化が図
られる。With this configuration, the same operation and effect as those of the twelfth embodiment are exhibited, and the rigidity of the inner peripheral edge portion 1221 substantially corresponding to the downward rib structure which most affects the deformation of the main bearing cap 2 in the crankshaft direction. Therefore, the same function and effect as those of the twelfth embodiment are exerted. In addition, since the area of the inner peripheral edge portion 1221 is smaller than the outer lower partition wall 122, the thickness of the portion is smaller than that of the twelfth embodiment, and the weight is reduced by that much compared to the twelfth embodiment.
【００６１】（実施形態１４）本実施形態は、図２０に
示すように、実施形態１３において、リブ１５を設ける
ことによって剛性を高める代わりに、シリンダ部６２の
操縦側のトップデッキ９からスカート部６１上部に至る
壁部１７に、シリンダ部６２の他の部分の構成材料より
ヤング率の高い材料を鋳込むことによって剛性を高め、
内側周縁部１２２１の肉厚を調節することによって剛性
を高める代わりに、内側周縁部１２２１に、主軸受３回
りの他の隔壁の構成材料よりヤング率の高い材料を鋳込
むことによって剛性を高め、その他は実施形態１３と同
じとしたものである。(Embodiment 14) In this embodiment, as shown in FIG. 20, instead of increasing the rigidity by providing the ribs 15 in the embodiment 13, instead of increasing the rigidity, the skirt portion is moved from the top deck 9 on the control side of the cylinder portion 62. The rigidity is increased by casting a material having a higher Young's modulus than the constituent material of the other part of the cylinder part 62 into the wall part 17 reaching the upper part of the cylinder part 61,
Instead of increasing the rigidity by adjusting the thickness of the inner peripheral portion 1221, the rigidity is increased by casting a material having a Young's modulus higher than that of the other partition walls around the main bearing 3 into the inner peripheral portion 1221. Others are the same as the thirteenth embodiment.
【００６２】これによれば、実施形態１３と同様の作用
効果が発揮されるとともに、隔壁の構成材料を変質させ
ることによって剛性が高められるので、肉厚を調節する
ことによって剛性を高める実施形態１３の場合に比し
て、軽量化が図られる。According to this, the same operation and effect as those of the thirteenth embodiment can be obtained, and the rigidity can be increased by altering the constituent material of the partition walls. Therefore, the thirteenth embodiment can increase the rigidity by adjusting the wall thickness. Lightening is achieved as compared with the case of
【００６３】なお、ヤング率の高い材料を鋳込むことに
よって剛性を高めるという前記構造は、実施形態１２に
おいても適用できる。The structure in which the rigidity is increased by casting a material having a high Young's modulus can be applied to the twelfth embodiment.
【００６４】（実施形態１５）図２１は本実施形態のシ
リンダブロック１０の横断面略図である。図２１におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、主軸受３回りの隔壁の内、主軸受ボルト
ボス部Ｂのボス部隔壁１１と、外側隔壁１２の外側下部
隔壁１２２の各剛性を、外側上部隔壁１２１及び内側隔
壁１３に比して高めるとともに、シリンダ部６２の操縦
側の剛性を高めてシリンダ部６２の非操縦側の剛性と同
等としている。具体的には、外側上部隔壁１２１及び内
側隔壁１３の各肉厚を鋳物として最低の肉厚とし、ボス
部隔壁１１及び外側下部隔壁１２２の各肉厚をそれより
厚くするとともに、外側下部隔壁１２２の肉厚を主軸受
キャップ２の肉厚の０．５〜１．０倍とし、シリンダ部
６２の操縦側の外壁にトップデッキ９からスカート部６
１上部に至るリブ１５を設けた。リブ１５は、ボア間及
びジャーナル間中心に、複数列設けられている。(Embodiment 15) FIG. 21 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 21, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the rigidity of the boss partition wall 11 of the main bearing bolt boss B and the outer lower partition wall 122 of the outer partition wall 12 among the partition walls around the main bearing 3 are compared with those of the outer upper partition wall 121 and the inner partition wall 13. And the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side. Specifically, the thickness of each of the outer upper partition 121 and the inner partition 13 is set to a minimum thickness as a casting, and the thickness of each of the boss partition 11 and the outer lower partition 122 is made larger. Of the main bearing cap 2 is 0.5 to 1.0 times the thickness of the main bearing cap 2, and the top deck 9 and the skirt 6
One rib 15 was provided to reach the upper part. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００６５】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保したので、主軸受キャップ２の上
下方向の変形が効果的に抑制され、また、主軸受キャッ
プ２のクランク軸方向の変形に最も影響する下向きリブ
構造に相当する部分を含んだ外側下部隔壁１２２の剛性
を確保したので、主軸受キャップ２のクランク軸方向の
変形が効果的に抑制され、しかも、リブ１５によってシ
リンダ部６２の操縦側の剛性を高めてシリンダ部６２の
非操縦側の剛性と同等としたので、シリンダブロック１
０の操縦側に凸となる変形が抑制される。即ち、主軸受
キャップ２の上下方向の変形、主軸受キャップ２のクラ
ンク軸方向の変形、及びシリンダブロック１０の操縦側
に凸となる変形が共に抑制される。更に、外側上部隔壁
１２１及び内側隔壁１３の各肉厚を鋳物として最低の肉
厚としたので、前記３種の変形を効果的に抑制しなが
ら、最大の軽量化が図られる。In the cylinder block 10 having the above-described structure, the rigidity of the boss partition wall 11, which most affects the vertical deformation of the main bearing cap 2, is ensured, so that the vertical deformation of the main bearing cap 2 is effectively suppressed. In addition, since the rigidity of the outer lower partition wall 122 including the portion corresponding to the downward rib structure that most affects the deformation of the main bearing cap 2 in the crankshaft direction is secured, the deformation of the main bearing cap 2 in the crankshaft direction is effective. The rigidity of the cylinder portion 62 on the control side is increased by the ribs 15 to be equal to the rigidity of the cylinder portion 62 on the non-control side.
Deformation that is convex on the steering side of 0 is suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction, the deformation of the main bearing cap 2 in the crankshaft direction, and the deformation of the cylinder block 10 that is convex on the steering side are all suppressed. Further, since the thickness of each of the outer upper partition 121 and the inner partition 13 is set to the minimum thickness as a casting, the maximum weight reduction is achieved while effectively suppressing the above three types of deformation.
【００６６】（実施形態１６）図２２は本実施形態のシ
リンダブロック１０の横断面略図である。図２２におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、ボス部隔壁１１と、外側隔壁１２全体即
ち外側上部隔壁１２１及び外側下部隔壁１２２の各剛性
を、内側隔壁１３に比して高めるとともに、シリンダ部
６２の操縦側の剛性を高めてシリンダ部６２の非操縦側
の剛性と同等としている。具体的には、内側隔壁１３の
肉厚を鋳物として最低の肉厚とし、ボス部隔壁１１、外
側上部隔壁１２１、及び外側下部隔壁１２２の各肉厚を
それより厚くするとともに、外側上部隔壁１２１の肉厚
をボス部隔壁１１の肉厚の０．５〜１．０倍とし、且つ
外側下部隔壁１２２の肉厚を主軸受キャップ２の肉厚の
０．５〜１．０倍とし、更に、シリンダ部６２の操縦側
の外壁にトップデッキ９からスカート部６１上部に至る
リブ１５を設けた。リブ１５は、ボア間及びジャーナル
間中心に、複数列設けられている。(Embodiment 16) FIG. 22 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 22, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In the present embodiment, the rigidity of the boss partition wall 11 and the entire outer partition wall 12, that is, the respective rigidities of the outer upper partition wall 121 and the outer lower partition wall 122 are increased as compared with the inner partition wall 13, and the rigidity of the cylinder portion 62 on the control side is increased. And the rigidity of the cylinder portion 62 on the non-steering side is the same. More specifically, the thickness of the inner partition wall 13 is set to the minimum thickness as a casting, and the thickness of each of the boss partition wall 11, the outer upper partition wall 121, and the outer lower partition wall 122 is made larger than that of the outer upper partition wall 121. Is 0.5 to 1.0 times the thickness of the boss partition 11, and the thickness of the outer lower partition 122 is 0.5 to 1.0 times the thickness of the main bearing cap 2. The rib 15 extending from the top deck 9 to the upper part of the skirt portion 61 is provided on the outer wall on the control side of the cylinder portion 62. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００６７】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造に相
当する部分を含んだ外側上部隔壁１２１の剛性も確保し
たので、主軸受キャップ２の上下方向の変形がより効果
的に抑制され、また、主軸受キャップ２のクランク軸方
向の変形に最も影響する下向きリブ構造に相当する部分
を含んだ外側下部隔壁１２２の剛性を確保したので、主
軸受キャップ２のクランク軸方向の変形が効果的に抑制
され、しかも、リブ１５によってシリンダ部６２の操縦
側の剛性を高めてシリンダ部６２の非操縦側の剛性と同
等としたので、シリンダブロック１０の操縦側に凸とな
る変形が抑制される。即ち、主軸受キャップ２の上下方
向の変形、主軸受キャップ２のクランク軸方向の変形、
及びシリンダブロック１０の操縦側に凸となる変形が共
に抑制される。更に、内側隔壁１３の肉厚を鋳物として
最低の肉厚としたので、前記３種の変形を効果的に抑制
しながら、最大の軽量化が図られる。In the cylinder block 10 having the above-described structure, not only the rigidity of the boss partition wall 11 which most affects the vertical deformation of the main bearing cap 2 is ensured, but also the vertical deformation of the main bearing cap 2 is most affected. Since the rigidity of the outer upper partition wall 121 including the portion corresponding to the upward rib structure is also ensured, the vertical deformation of the main bearing cap 2 is more effectively suppressed, and the deformation of the main bearing cap 2 in the crankshaft direction. The rigidity of the outer lower partition wall 122 including the portion corresponding to the downward rib structure that has the greatest influence on the axial direction is ensured, so that the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed. The rigidity on the control side is increased to be equal to the rigidity on the non-control side of the cylinder portion 62, so that the deformation of the cylinder block 10 that is convex on the control side is suppressed. . That is, the deformation of the main bearing cap 2 in the vertical direction, the deformation of the main bearing cap 2 in the crankshaft direction,
In addition, the deformation of the cylinder block 10 that is convex on the steering side is suppressed. Further, since the thickness of the inner partition wall 13 is made the minimum thickness as a casting, the maximum weight reduction is achieved while effectively suppressing the above three types of deformation.
【００６８】（実施形態１７）図２３は本実施形態のシ
リンダブロック１０の横断面略図である。図２３におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、ボス部隔壁１１と、外側上部隔壁１２１
の上部上半部隔壁１２１１と、外側下部隔壁１２２の各
剛性を、外側上部隔壁１２１の上部下半部隔壁１２１２
及び内側隔壁１３に比して高めるとともに、シリンダ部
６２の操縦側の剛性を高めてシリンダ部６２の非操縦側
の剛性と同等としている。具体的には、上部下半部隔壁
１２１２及び内側隔壁１３の各肉厚を鋳物として最低の
肉厚とし、ボス部隔壁１１、上部上半部隔壁１２１１、
及び外側下部隔壁１２２の各肉厚をそれより厚くすると
ともに、上部上半部隔壁１２１１の肉厚をボス部隔壁１
１の肉厚の０．５〜１．０倍とし、且つ外側下部隔壁１
２２の肉厚を主軸受キャップ２の肉厚の０．５〜１．０
倍とし、更に、シリンダ部６２の操縦側の外壁にトップ
デッキ９からスカート部６１上部に至るリブ１５を設け
た。リブ１５は、ボア間及びジャーナル間中心に、複数
列設けられている。(Embodiment 17) FIG. 23 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 23, the same reference numerals as those in FIG. 8 denote the same or corresponding components. In this embodiment, the boss partition 11 and the outer upper partition 121 are provided.
The rigidity of the upper upper partition wall 1211 and the outer lower partition wall 122 is determined by the upper lower partition wall 1212 of the outer upper partition wall 121.
And the rigidity of the cylinder portion 62 on the control side is increased to be equal to the rigidity of the cylinder portion 62 on the non-control side. Specifically, the thickness of each of the upper lower half partition 1212 and the inner partition 13 is set to the minimum thickness as a casting, and the boss partition 11, the upper upper partition 1211,
And the thickness of the outer lower partition wall 122 is made greater than that of the boss partition wall 1.
1 to 0.5 to 1.0 times the thickness of the outer partition wall 1
22 is 0.5 to 1.0 of the thickness of the main bearing cap 2.
The ribs 15 extending from the top deck 9 to the upper part of the skirt 61 are provided on the outer wall on the control side of the cylinder 62. A plurality of ribs 15 are provided in the center between the bores and between the journals.
【００６９】上記構造のシリンダブロック１０では、主
軸受キャップ２の上下方向の変形に最も影響するボス部
隔壁１１の剛性を確保するだけでなく、主軸受キャップ
２の上下方向の変形に最も影響する上向きリブ構造に相
当する部分を含んだ上部上半部隔壁１２１１の剛性も確
保したので、主軸受キャップ２の上下方向の変形がより
効果的に抑制され、また、主軸受キャップ２のクランク
軸方向の変形に最も影響する下向きリブ構造に相当する
部分を含んだ外側下部隔壁１２２の剛性を確保したの
で、主軸受キャップ２のクランク軸方向の変形が効果的
に抑制され、しかも、リブ１５によってシリンダ部６２
の操縦側の剛性を高めてシリンダ部６２の非操縦側の剛
性と同等としたので、シリンダブロック１０の操縦側に
凸となる変形が抑制される。即ち、主軸受キャップ２の
上下方向の変形、主軸受キャップ２のクランク軸方向の
変形、及びシリンダブロック１０の操縦側に凸となる変
形が共に抑制される。更に、上部下半部隔壁１２１２及
び内側隔壁１３の各肉厚を鋳物として最低の肉厚とした
ので、前記３種の変形を効果的に抑制しながら、最大の
軽量化が図られる。しかも、上部上半部隔壁１２１１の
領域は外側上部隔壁１２１より小さいので、厚肉化する
部分が実施形態１６の場合より少なく、その分だけ、実
施形態１６よりも軽量化が図られる。In the cylinder block 10 having the above structure, not only is the rigidity of the boss partition wall 11 most influential on the vertical deformation of the main bearing cap 2 secured, but also the most influential on the vertical deformation of the main bearing cap 2. Since the rigidity of the upper upper half partition 1211 including the portion corresponding to the upward rib structure is also ensured, the deformation of the main bearing cap 2 in the vertical direction is more effectively suppressed, and the main bearing cap 2 in the crankshaft direction. Since the rigidity of the outer lower partition wall 122 including the portion corresponding to the downward rib structure which most affects the deformation of the main bearing cap 2 is secured, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed. Part 62
The rigidity on the control side is increased to be equal to the rigidity on the non-control side of the cylinder portion 62, so that the deformation of the cylinder block 10 that is convex on the control side is suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction, the deformation of the main bearing cap 2 in the crankshaft direction, and the deformation of the cylinder block 10 that is convex on the steering side are all suppressed. Further, since the thickness of each of the upper and lower half partition walls 1212 and the inner partition wall 13 is the minimum thickness as a casting, the maximum weight reduction is achieved while effectively suppressing the above three types of deformation. In addition, since the region of the upper upper partition wall 1211 is smaller than the outer upper partition wall 121, the thickness of the portion is smaller than that of the sixteenth embodiment, and the weight is reduced by that much.
【００７０】（実施形態１８）本実施形態は、図２４に
示すように、実施形態１７において、上部上半部隔壁１
２１１全体の剛性を高める代わりに、その下縁部１２１
１ａのみの剛性を高め、外側下部隔壁１２２全体の剛性
を高める代わりに、その内側周縁部１２２１のみの剛性
を高め、その他は実施形態１７と同じとしたものであ
る。具体的には、下縁部１２１１ａの肉厚をボス部隔壁
１１の肉厚の０．５〜１．０倍とし、内側周縁部１２２
１の肉厚を主軸受キャップ２の肉厚の０．５〜１．０倍
とした。なお、上部上半部隔壁１２１１の上側部１２１
１ｂ及び外側下部隔壁１２２の外側部１２２２の各肉厚
は鋳物として最低の肉厚とした。(Embodiment 18) In this embodiment, as shown in FIG.
Instead of increasing the rigidity of the entire 211, its lower edge 121
Instead of increasing the rigidity of only 1a and increasing the rigidity of the entire outer lower partition 122, the rigidity of only the inner peripheral portion 1221 is increased, and the other configuration is the same as that of the seventeenth embodiment. Specifically, the thickness of the lower edge portion 1211a is set to 0.5 to 1.0 times the thickness of the boss partition wall 11, and the inner peripheral portion 122
1 was 0.5 to 1.0 times the thickness of the main bearing cap 2. The upper part 121 of the upper upper half partition 1211 is used.
The thicknesses of the outer wall 122b of the outer lower partition wall 1b and the outer lower partition wall 122 were set to the minimum thickness as a casting.
【００７１】これによっても、主軸受キャップ２の上下
方向の変形に最も影響する上向きリブ構造に実質的に相
当する下縁部１２１１ａの剛性を確保し、また、主軸受
キャップ２のクランク軸方向の変形に最も影響する下向
きリブ構造に実質的に相当する内側周縁部１２２１の剛
性を確保したので、実施形態１７と同様の作用効果が発
揮される。しかも、下縁部１２１１ａの領域は上部上半
部隔壁１２１１より小さく、また、内側周縁部１２２１
の領域は外側下部隔壁１２２より小さいので、厚肉化す
る部分が実施形態１７の場合より少なく、その分だけ、
実施形態１７よりも軽量化が図られる。This also ensures the rigidity of the lower edge portion 1211a substantially corresponding to the upward rib structure that most affects the vertical deformation of the main bearing cap 2 and also allows the main bearing cap 2 to move in the crankshaft direction. Since the rigidity of the inner peripheral portion 1221 substantially corresponding to the downward rib structure that most affects the deformation is secured, the same operation and effect as those of the seventeenth embodiment are exerted. Moreover, the area of the lower edge 1211a is smaller than the upper upper half partition 1211 and the inner peripheral edge 1221a.
Is smaller than the outer lower partition wall 122, so that the portion to be thickened is smaller than in the case of the seventeenth embodiment.
Lighter weight than the seventeenth embodiment is achieved.
【００７２】なお、外側上部隔壁１２１全体の代わりに
下縁部１２１１ａのみの剛性を高め、且つ外側下部隔壁
１２２全体の代わりに内側周縁部１２２１のみの剛性を
高めるという前記構造は、実施形態１６においても適用
できる。The structure in which the rigidity of only the lower edge 1211a is increased instead of the entire outer upper partition 121 and the rigidity of only the inner peripheral edge 1221 is increased instead of the entire outer lower partition 122 is the same as that of the sixteenth embodiment. Can also be applied.
【００７３】（実施形態１９）図２５は本実施形態のシ
リンダブロック１０の横断面略図である。図２５におい
て、図８と同一符号は同じ又は相当するものを示す。本
実施形態では、主軸受ボルトボス部Ｂ、上部上半部隔壁
１２１１の下縁部１２１１ａ、及び外側下部隔壁１２２
の内側周縁部１２２１の各剛性を、内側隔壁１３、上部
上半部隔壁１２１１の上側部１２１１ｂ、及び外側下部
隔壁１２２の外側部１２２２の各剛性に比して高めると
ともに、シリンダ部６２の操縦側の剛性を高めてシリン
ダ部６２の非操縦側の剛性と同等としている。具体的に
は、シリンダ部６２の操縦側の外壁にトップデッキ９か
らスカート部６１上部に至るリブ１５を設けるととも
に、リブ１５に繋げて操縦側の主軸受ボルトボス部Ｂを
通って主軸受キャップ合わせ面５まで至るリブ１６１を
設けた。リブ１５は、ボア間及びジャーナル間中心に、
複数列設けられており、リブ１６１と繋がっているリブ
１５はジャーナル間中心に設けられたものである。ま
た、非操縦側の主軸受ボルトボス部Ｂにもリブ１６１と
対称にリブ１６２を設けた。また、下縁部１２１１ａの
肉厚をボス部隔壁１１の肉厚の０．５〜１．０倍とし、
内側周縁部１２２１の肉厚を主軸受キャップ２の肉厚の
０．５〜１．０倍とした。なお、上部上半部隔壁１２１
１の上側部１２１１ｂ、外側下部隔壁１２２の外側部１
２２２、及び内側隔壁１３の各肉厚は鋳物として最低の
肉厚とした。(Embodiment 19) FIG. 25 is a schematic cross-sectional view of a cylinder block 10 of the present embodiment. 25, the same symbols as those in FIG. 8 indicate the same or corresponding elements. In the present embodiment, the main bearing bolt boss B, the lower edge 1211a of the upper upper half partition 1211 and the outer lower partition 122
And the rigidity of the inner peripheral portion 1221 of the cylinder portion 62, the upper portion 1211b of the upper upper half partition 1211 and the outer portion 1222 of the outer lower partition 122 are increased. And the rigidity of the cylinder portion 62 on the non-steering side is made equal. Specifically, a rib 15 extending from the top deck 9 to the upper part of the skirt portion 61 is provided on the outer wall on the control side of the cylinder portion 62, and is connected to the rib 15 to pass through the main bearing bolt boss portion B on the control side to fit the main bearing cap. The rib 161 reaching the surface 5 was provided. The rib 15 is located between the bores and between the journals.
The ribs 15 provided in a plurality of rows and connected to the rib 161 are provided at the center between the journals. The rib 162 is also provided symmetrically with the rib 161 on the main bearing bolt boss B on the non-steering side. Further, the thickness of the lower edge portion 1211a is set to 0.5 to 1.0 times the thickness of the boss partition wall 11,
The thickness of the inner peripheral portion 1221 is set to 0.5 to 1.0 times the thickness of the main bearing cap 2. In addition, the upper upper half partition 121
1 upper portion 1211b, outer portion 1 of outer lower partition wall 122
The thickness of each of the inner wall 222 and the inner partition 13 was set to the minimum thickness as a casting.
【００７４】上記構造のシリンダブロック１０では、リ
ブ１５によってシリンダ部６２の操縦側の剛性を高めて
シリンダ部６２の非操縦側の剛性と同等としたので、シ
リンダブロック１０の操縦側に凸となる変形が抑制さ
れ、また、主軸受キャップ２の上下方向の変形に最も影
響する主軸受ボルトボス部Ｂの剛性をリブ１６１，１６
２によって確保するとともに主軸受キャップ２の上下方
向の変形に最も影響する上向きリブ構造に実質的に相当
する下縁部１２１１ａの剛性を確保したので、主軸受キ
ャップ２の上下方向の変形が効果的に抑制され、しか
も、主軸受キャップ２のクランク軸方向の変形に最も影
響する下向きリブ構造に実質的に相当する内側周縁部１
２２１の剛性を確保したので、主軸受キャップ２のクラ
ンク軸方向の変形が効果的に抑制される。即ち、主軸受
キャップ２の上下方向の変形、主軸受キャップ２のクラ
ンク軸方向の変形、及びシリンダブロック１０の操縦側
に凸となる変形が共に抑制される。更に、上側部１２１
１ｂ、外側部１２２２、及び内側隔壁１３の各肉厚は鋳
物として最低の肉厚としたので、前記３種の変形を効果
的に抑制しながら、最大の軽量化が図られる。しかも、
リブ１５とリブ１６１とが繋がって形成されるので、製
造作業が容易である。In the cylinder block 10 having the structure described above, the rigidity of the cylinder portion 62 on the control side is increased by the ribs 15 so as to be equal to the rigidity of the cylinder portion 62 on the non-control side. Deformation is suppressed, and the rigidity of the main bearing bolt boss portion B, which most affects the vertical deformation of the main bearing cap 2, is reduced by ribs 161, 16
2 as well as the rigidity of the lower edge portion 1211a substantially corresponding to the upward rib structure that has the greatest influence on the vertical deformation of the main bearing cap 2, so that the vertical deformation of the main bearing cap 2 is effective. And the inner peripheral portion 1 substantially corresponding to the downward rib structure that most affects the deformation of the main bearing cap 2 in the crankshaft direction.
As a result, the deformation of the main bearing cap 2 in the crankshaft direction is effectively suppressed. That is, the deformation of the main bearing cap 2 in the vertical direction, the deformation of the main bearing cap 2 in the crankshaft direction, and the deformation of the cylinder block 10 that is convex on the steering side are all suppressed. Further, the upper part 121
Since the thickness of each of the outer wall 1b, the outer portion 1222, and the inner partition wall 13 is the minimum thickness as a casting, the maximum weight reduction is achieved while effectively suppressing the three types of deformation. Moreover,
Since the rib 15 and the rib 161 are formed so as to be connected, the manufacturing operation is easy.
【００７５】（実施形態２０）本実施形態は、図２６に
示すように、実施形態１９において、リブ１５を設ける
ことによって剛性を高める代わりに、シリンダ部６２の
操縦側のトップデッキ９からスカート部６１上部に至る
壁部１７に、シリンダ部６２の他の部分の構成材料より
ヤング率の高い材料を鋳込むことによって剛性を高め、
リブ１６１，１６２を設けることによって主軸受ボルト
ボス部Ｂの剛性を高める代わりに、及び下縁部１２１１
ａと内側周縁部１２２１の各肉厚を調節することによっ
て剛性を高める代わりに、ボス部隔壁１１、下縁部１２
１１ａ、及び内側周縁部１２２１に、主軸受３回りの他
の隔壁即ち上側部１２１１ｂ、外側部１２２２、及び内
側隔壁１３の構成材料よりヤング率の高い材料を鋳込む
ことによって剛性を高めたものである。ヤング率の高い
材料は、母材よりヤング率が高い材料であり、例えば母
材がＦＣ材の場合ではＦＣＤやＳＵＳを用いる。(Embodiment 20) In this embodiment, as shown in FIG. 26, instead of increasing the rigidity by providing the ribs 15 in the embodiment 19, instead of increasing the rigidity by providing the ribs 15 from the top deck 9 on the control side of the cylinder portion 62, The rigidity is increased by casting a material having a higher Young's modulus than the constituent material of the other part of the cylinder part 62 into the wall part 17 reaching the upper part of the cylinder part 61,
Instead of increasing the rigidity of the main bearing bolt boss portion B by providing the ribs 161 and 162, and the lower edge portion 1211
Instead of increasing the rigidity by adjusting the thickness of each of the inner peripheral portion 1221 and the inner peripheral portion 1221, the boss portion partition 11 and the lower
The rigidity is increased by casting a material having a higher Young's modulus than the constituent materials of the other partitions around the main bearing 3, that is, the upper portion 1211 b, the outer portion 1222, and the inner partition 13, into the inner peripheral portion 122 a and the inner peripheral portion 122 a. is there. The material having a higher Young's modulus is a material having a higher Young's modulus than the base material. For example, when the base material is an FC material, FCD or SUS is used.
【００７６】これによれば、実施形態１９と同様の作用
効果が発揮されるとともに、隔壁の構成材料を変質させ
ることによって剛性が高められるので、肉厚を調節する
ことによって剛性を高める実施形態１９の場合に比し
て、軽量化が図られる。According to this, the same operation and effect as those of the nineteenth embodiment are exhibited, and the rigidity is increased by altering the constituent material of the partition walls. Therefore, the rigidity is enhanced by adjusting the wall thickness. Lightening is achieved as compared with the case of
【００７７】（別の実施形態）実施形態１〜２０では、
剛性を高める壁以外の壁の肉厚を鋳物として最低の肉厚
としているが、必ずしも最低としなくてもよい。(Alternative Embodiment) In the first to twentieth embodiments,
Although the thickness of the wall other than the wall for increasing the rigidity is set to the minimum thickness as a casting, it is not always necessary to set the thickness to the minimum.
【００７８】[0078]
【発明の効果】請求項１記載の発明によれば、構造(1)
〜(3)の内の少なくとも２つを採用するので、主軸受キ
ャップの上下方向の変形、主軸受キャップ２のクランク
軸方向の変形、シリンダブロックが操縦側に凸となる変
形の内の少なくとも２つを抑制できる。According to the first aspect of the present invention, the structure (1)
Since at least two of (3) are adopted, at least two of the deformation of the main bearing cap in the vertical direction, the deformation of the main bearing cap 2 in the crankshaft direction, and the deformation of the cylinder block protruding toward the control side are adopted. Can be suppressed.
【００７９】請求項２記載の発明によれば、主軸受キャ
ップの上下方向の変形を更に効果的に抑制できる。According to the second aspect of the invention, the deformation of the main bearing cap in the vertical direction can be more effectively suppressed.
【００８０】請求項３記載の発明によれば、主軸受キャ
ップの上下方向の変形を更に効果的に抑制できる。しか
も、剛性を高める隔壁の領域が請求項２の場合より小さ
いので、肉厚を調節して剛性を高める場合には厚肉化す
る隔壁の領域が請求項２の場合より小さくなり、それ故
に、請求項２の場合より軽量化を図ることができる。According to the third aspect of the invention, the deformation of the main bearing cap in the vertical direction can be more effectively suppressed. Moreover, since the area of the partition wall for increasing the rigidity is smaller than that of the second aspect, when the thickness is adjusted to increase the rigidity, the area of the partition wall to be thickened is smaller than that of the second aspect. The weight can be reduced as compared with the case of the second aspect.
【００８１】請求項４記載の発明によれば、リブによっ
て剛性を高めるので、製造作業を容易なものにできる。According to the fourth aspect of the present invention, since the rigidity is increased by the rib, the manufacturing operation can be simplified.
【００８２】請求項５記載の発明によれば、リブを形成
するだけで、前記構造(1)及び(3)を実現できるので、製
造作業を容易なものにできる。According to the fifth aspect of the present invention, since the structures (1) and (3) can be realized only by forming the ribs, the manufacturing operation can be simplified.
【００８３】請求項６記載の発明によれば、肉厚の調節
によって剛性を高めるので、製造作業を容易なものにで
きる。According to the sixth aspect of the invention, since the rigidity is increased by adjusting the thickness, the manufacturing operation can be simplified.
【００８４】請求項７記載の発明によれば、剛性を高く
できるとともに軽量化も図ることができる。According to the seventh aspect of the invention, the rigidity can be increased and the weight can be reduced.
【００８５】請求項８記載の発明によれば、剛性を高く
できるとともに軽量化も図ることができる。According to the eighth aspect of the invention, the rigidity can be increased and the weight can be reduced.
【００８６】請求項９記載の発明によれば、隔壁の構成
材料を変質させることによって剛性を高めるので、肉厚
を調節することによって剛性を高める場合に比して、軽
量化を図ることができる。According to the ninth aspect of the present invention, since the rigidity is increased by altering the material of the partition walls, the weight can be reduced as compared with the case where the rigidity is increased by adjusting the wall thickness. .
【００８７】請求項１０記載の発明によれば、シリンダ
部の構成材料を変質させることによって剛性を高めるの
で、リブを設けることによって剛性を高める場合に比し
て、軽量化を図ることができる。According to the tenth aspect of the present invention, since the rigidity is increased by altering the material of the cylinder portion, the weight can be reduced as compared with the case where the rigidity is increased by providing the ribs.
【００８８】請求項１１記載の発明によれば、シリンダ
ブロックの変形を抑制しながら、最大の軽量化を図るこ
とができる。According to the eleventh aspect, maximum weight reduction can be achieved while suppressing deformation of the cylinder block.
【図１】 クランク軸から加わる機械的荷重を示すクラ
ンク軸方向断面図である。FIG. 1 is a sectional view in the crankshaft direction showing a mechanical load applied from a crankshaft.
【図２】 主軸受回りの上部隔壁を説明するためのシリ
ンダブロックの模式横断面図である。FIG. 2 is a schematic cross-sectional view of a cylinder block for explaining an upper partition wall around a main bearing.
【図３】 クランク軸から加わる機械的荷重を示すクラ
ンク軸方向断面図である。FIG. 3 is a sectional view in the direction of the crankshaft showing a mechanical load applied from the crankshaft.
【図４】 主軸受キャップのクランク軸方向の変形を説
明するためのシリンダブロックの模式横断面図である。FIG. 4 is a schematic cross-sectional view of a cylinder block for explaining deformation of a main bearing cap in a crankshaft direction.
【図５】 主軸受回りのリブ構造を説明するためのシリ
ンダブロックの模式横断面図である。FIG. 5 is a schematic cross-sectional view of a cylinder block for explaining a rib structure around a main bearing.
【図６】 シリンダブロックの操縦側及び非操縦側にお
ける上下変形量の差を説明するためのシリンダブロック
の横断面図である。FIG. 6 is a cross-sectional view of the cylinder block for explaining a difference in vertical deformation between the control side and the non-control side of the cylinder block.
【図７】 主軸受回りのリブ構造を説明するためのシリ
ンダブロックの模式横断面図である。FIG. 7 is a schematic cross-sectional view of a cylinder block for explaining a rib structure around a main bearing.
【図８】 実施形態１のシリンダブロックの横断面略図
である。FIG. 8 is a schematic cross-sectional view of the cylinder block of the first embodiment.
【図９】 実施形態２のシリンダブロックの横断面略図
である。FIG. 9 is a schematic cross-sectional view of a cylinder block according to a second embodiment.
【図１０】 実施形態３のシリンダブロックの横断面略
図である。FIG. 10 is a schematic cross-sectional view of a cylinder block according to a third embodiment.
【図１１】 実施形態４のシリンダブロックの横断面略
図である。FIG. 11 is a schematic cross-sectional view of a cylinder block according to a fourth embodiment.
【図１２】 実施形態５のシリンダブロックの横断面略
図である。FIG. 12 is a schematic cross-sectional view of a cylinder block according to a fifth embodiment.
【図１３】 実施形態７のシリンダブロックの横断面略
図である。FIG. 13 is a schematic cross-sectional view of a cylinder block according to a seventh embodiment.
【図１４】 実施形態８のシリンダブロックの横断面略
図である。FIG. 14 is a schematic cross-sectional view of a cylinder block according to an eighth embodiment.
【図１５】 実施形態９のシリンダブロックの横断面略
図である。FIG. 15 is a schematic cross-sectional view of a cylinder block according to a ninth embodiment.
【図１６】 実施形態１０のシリンダブロックの横断面
略図である。FIG. 16 is a schematic cross-sectional view of a cylinder block according to a tenth embodiment.
【図１７】 実施形態１１のシリンダブロックの横断面
略図である。FIG. 17 is a schematic cross-sectional view of a cylinder block according to an eleventh embodiment.
【図１８】 実施形態１２のシリンダブロックの横断面
略図である。FIG. 18 is a schematic cross-sectional view of a cylinder block according to a twelfth embodiment.
【図１９】 実施形態１３のシリンダブロックの横断面
略図である。FIG. 19 is a schematic cross-sectional view of a cylinder block according to a thirteenth embodiment.
【図２０】 実施形態１４のシリンダブロックの横断面
略図である。FIG. 20 is a schematic cross-sectional view of a cylinder block according to a fourteenth embodiment.
【図２１】 実施形態１５のシリンダブロックの横断面
略図である。FIG. 21 is a schematic cross-sectional view of a cylinder block according to a fifteenth embodiment.
【図２２】 実施形態１６のシリンダブロックの横断面
略図である。FIG. 22 is a schematic cross-sectional view of a cylinder block according to a sixteenth embodiment.
【図２３】 実施形態１７のシリンダブロックの横断面
略図である。FIG. 23 is a schematic cross-sectional view of a cylinder block according to a seventeenth embodiment.
【図２４】 実施形態１８のシリンダブロックの横断面
略図である。FIG. 24 is a schematic cross-sectional view of a cylinder block according to an eighteenth embodiment.
【図２５】 実施形態１９のシリンダブロックの横断面
略図である。FIG. 25 is a schematic cross-sectional view of a cylinder block according to a nineteenth embodiment.
【図２６】 実施形態２０のシリンダブロックの横断面
略図である。FIG. 26 is a schematic cross-sectional view of a cylinder block according to a twentieth embodiment.
２ 主軸受キャップ ３ 主軸受 ４ ロアデッキ ５ 主軸受キャップ合わせ面 ６１ スカート部 ６２ シリンダ部 ７ オイルパン合わせ面 ８１ カム室 ８２ リブ ９ トップデッキ １０ シリンダブロック １１ ボス部隔壁 １２ 外側隔壁 １２１ 外側上部隔壁 １２１１ 上部上半部隔壁 １２１１ａ 下縁部 １２１１ｂ 上側部 １２１２ 上部下半部隔壁 １２２ 外側下部隔壁 １２２１ 内側周縁部 １２２２ 外側部 １３ 内側隔壁 １５ リブ １６１，１６２ リブ １７ 壁部 2 Main bearing cap 3 Main bearing 4 Lower deck 5 Main bearing cap mating surface 61 Skirt portion 62 Cylinder portion 7 Oil pan mating surface 81 Cam chamber 82 Rib 9 Top deck 10 Cylinder block 11 Boss partition 12 Outer partition 121 Outer upper partition 1211 Upper part Upper half partition 1211a Lower edge 1211b Upper part 1212 Upper lower half partition 122 Outer lower partition 1221 Inner peripheral part 1222 Outer part 13 Inner partition 15 Ribs 161 and 162 Ribs 17 Wall
Claims (11)
とを特徴とするシリンダブロック高剛性構造。 (1)主軸受回りの上部隔壁の内、少なくとも主軸受ボル
トボス部の剛性を、主軸受回りの上部隔壁の内の他の隔
壁に比して高めた。 (2)主軸受回りの隔壁の内、主軸受キャップ合わせ面か
らオイルパン合わせ面にかけての隔壁の剛性を、主軸受
回りの隔壁の内の他の隔壁に比して高めた。 (3)シリンダ部の操縦側の剛性を高めて、カム室及びそ
れを支持するリブを備えたシリンダ部の非操縦側の剛性
と同等とした。1. A highly rigid structure for a cylinder block, wherein at least two of the following structures (1) to (3) are employed in the cylinder block. (1) The rigidity of at least the main bearing bolt boss portion of the upper partition wall around the main bearing is increased as compared with the other partition walls of the upper partition wall around the main bearing. (2) Among the bulkheads around the main bearing, the rigidity of the bulkhead from the mating surface of the main bearing cap to the mating surface of the oil pan is increased as compared with the other bulkheads around the main bearing. (3) The rigidity of the cylinder section on the control side is increased to be equal to the rigidity of the cylinder section having the cam chamber and the rib supporting the cam chamber on the non-control side.
主軸受回りで主軸受ボルトボス部の外側の隔壁の内、ロ
アデッキから主軸受キャップ合わせ面にかけての隔壁の
剛性を、前記外側の隔壁の内の他の隔壁に比して高めた
請求項１記載のシリンダブロック高剛性構造。2. When the structure (1) is adopted,
2. The partition according to claim 1, wherein the rigidity of the partition between the lower deck and the main bearing cap mating surface of the partition outside the main bearing bolt boss around the main bearing is increased as compared with the other partitions among the outer partition. High rigidity cylinder block structure.
主軸受回りで主軸受ボルトボス部の外側の隔壁の内、ロ
アデッキから主軸受キャップ合わせ面にかけての隔壁で
あって、主軸受キャップ合わせ面から上向き４５度以上
の隔壁の剛性を、前記外側の隔壁の内の他の隔壁に比し
て高めた請求項１記載のシリンダブロック高剛性構造。3. When the structure (1) is adopted,
Of the bulkheads outside the main bearing bolt boss around the main bearing, the bulkhead is from the lower deck to the main bearing cap mating surface, and has a rigidity of the bulkhead of 45 degrees or more upward from the main bearing cap mating surface, The high rigidity structure of the cylinder block according to claim 1, wherein the structure is higher than other partition walls in the cylinder block.
シリンダ部の操縦側の外壁に、トップデッキからスカー
ト部上部に至る上下方向のリブを設け、これによって剛
性を高めた請求項１記載のシリンダブロック高剛性構
造。4. When the structure (3) is adopted,
2. The cylinder block high rigidity structure according to claim 1, wherein a vertical rib extending from a top deck to an upper part of the skirt is provided on an outer wall on the control side of the cylinder to thereby increase rigidity.
た場合において、シリンダ部の操縦側の外壁に、トップ
デッキからスカート部上部に至る上下方向のリブを設
け、これによって前記構造(3)における剛性を高め、該
リブに繋げて操縦側の主軸受ボルトボス部を通って主軸
受キャップ合わせ面まで至るリブを設けるとともに、非
操縦側の主軸受ボルトボス部を通って主軸受キャップ合
わせ面まで至るリブを設け、これによって前記(1)にお
ける剛性を高めた請求項１記載のシリンダブロック高剛
性構造。5. In a case where at least the structures (1) and (3) are adopted, a vertical rib extending from a top deck to an upper part of a skirt portion is provided on an outer wall on the control side of the cylinder portion, whereby the structure ( The rigidity in 3) is increased, and a rib is provided connecting the rib to the main bearing cap boss portion through the main bearing bolt boss portion on the steering side, and the main bearing cap mating surface through the main bearing bolt boss portion on the non-control side. 2. The cylinder block high rigidity structure according to claim 1, wherein ribs are provided to extend the rigidity in (1).
いて、肉厚を調節することによって剛性を高めた請求項
１記載のシリンダブロック高剛性構造。6. The cylinder block high rigidity structure according to claim 1, wherein when the structure (1) or (2) is adopted, the rigidity is increased by adjusting the wall thickness.
主軸受ボルトボス部の肉厚の０．５〜１．０倍の肉厚と
することによって剛性を高めた請求項２又は３に記載の
シリンダブロック高剛性構造。7. When the structure (1) is adopted,
The cylinder block high rigidity structure according to claim 2 or 3, wherein the rigidity is enhanced by making the thickness of the main bearing bolt boss part 0.5 to 1.0 times the thickness.
主軸受キャップの肉厚の０．５〜１．０倍の肉厚とする
ことによって剛性を高めた請求項１記載のシリンダブロ
ック高剛性構造。8. When the structure (2) is adopted,
2. The cylinder block high rigidity structure according to claim 1, wherein the rigidity is increased by making the thickness of the main bearing cap 0.5 to 1.0 times the thickness.
いて、前記他の隔壁の構成材料よりヤング率の高い材料
を鋳込むことによって剛性を高めた請求項１記載のシリ
ンダブロック高剛性構造。9. The cylinder block height according to claim 1, wherein when the structure (1) or (2) is adopted, the rigidity is increased by casting a material having a higher Young's modulus than the constituent material of the other partition. Rigid structure.
て、シリンダ部の操縦側のトップデッキからスカート部
上部に至る壁部に、シリンダ部の他の部分の構成材料よ
りヤング率の高い材料を鋳込むことによって剛性を高め
た請求項１記載のシリンダブロック高剛性構造。10. In the case where the structure (3) is adopted, a material having a Young's modulus higher than that of the other parts of the cylinder portion is applied to a wall portion extending from the top deck on the control side of the cylinder portion to the upper portion of the skirt portion. The cylinder block high rigidity structure according to claim 1, wherein the rigidity is increased by casting.
おいて、前記他の隔壁の肉厚を、鋳物としての最低の肉
厚とした請求項１記載のシリンダブロック高剛性構造。11. The cylinder block high rigidity structure according to claim 1, wherein in the case where the structure (1) or (2) is adopted, the thickness of the other partition wall is a minimum thickness as a casting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10351266A JP2000170603A (en) | 1998-12-10 | 1998-12-10 | Cylinder block high rigidity structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10351266A JP2000170603A (en) | 1998-12-10 | 1998-12-10 | Cylinder block high rigidity structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000170603A true JP2000170603A (en) | 2000-06-20 |
Family
ID=18416160
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10351266A Pending JP2000170603A (en) | 1998-12-10 | 1998-12-10 | Cylinder block high rigidity structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000170603A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2228530A1 (en) * | 2009-03-13 | 2010-09-15 | Ford Global Technologies, LLC | Crankcase for a piston engine |
| CN110425055A (en) * | 2019-08-27 | 2019-11-08 | 浙江义利汽车零部件有限公司 | Vehicle crank shaft case and vehicle |
-
1998
- 1998-12-10 JP JP10351266A patent/JP2000170603A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP2228530A1 (en) * | 2009-03-13 | 2010-09-15 | Ford Global Technologies, LLC | Crankcase for a piston engine |
| CN110425055A (en) * | 2019-08-27 | 2019-11-08 | 浙江义利汽车零部件有限公司 | Vehicle crank shaft case and vehicle |
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