JPH0730978Y2 - Crankshaft bearing structure - Google Patents

Crankshaft bearing structure

Info

Publication number
JPH0730978Y2
JPH0730978Y2 JP1987175186U JP17518687U JPH0730978Y2 JP H0730978 Y2 JPH0730978 Y2 JP H0730978Y2 JP 1987175186 U JP1987175186 U JP 1987175186U JP 17518687 U JP17518687 U JP 17518687U JP H0730978 Y2 JPH0730978 Y2 JP H0730978Y2
Authority
JP
Japan
Prior art keywords
holder
crankcase
bolt
crankshaft
fitting recess
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
JP1987175186U
Other languages
Japanese (ja)
Other versions
JPH0178720U (en
Inventor
鈴木  茂
孝 千葉
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Honda Motor Co Ltd
Original Assignee
Honda Motor Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Honda Motor Co Ltd filed Critical Honda Motor Co Ltd
Priority to JP1987175186U priority Critical patent/JPH0730978Y2/en
Publication of JPH0178720U publication Critical patent/JPH0178720U/ja
Application granted granted Critical
Publication of JPH0730978Y2 publication Critical patent/JPH0730978Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

  • Cylinder Crankcases Of Internal Combustion Engines (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Description

【考案の詳細な説明】 (産業上の利用分野) 本考案はクランク軸の軸受構造に関する。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a bearing structure for a crankshaft.

(従来の技術及び考案が解決しようとする問題点) クランク軸の端部をクランクケースに軸支する構造とし
ては、クランクケースに嵌合凹部を形成するとともに該
嵌合凹部にホルダーを嵌入し、該ホルダーと前記クラン
クケースとの間でクランク軸を軸支するようにしたもの
がある。
(Problems to be solved by conventional techniques and devices) As a structure for pivotally supporting an end of a crankshaft in a crankcase, a fitting recess is formed in the crankcase, and a holder is fitted in the fitting recess. There is one in which a crankshaft is pivotally supported between the holder and the crankcase.

ところで斯かるクランク軸の軸受構造では前記ホルダー
はボルトにより前記クランクケースに固定されるが、こ
のボルトの緩みを簡単且つ低コストな構造で防止できる
ようにすることが望まれていた。
By the way, in such a crankshaft bearing structure, the holder is fixed to the crankcase by bolts, but it has been desired to prevent loosening of the bolts with a simple and low-cost structure.

(問題点を解決するための手段) クランクケースに嵌合凹部を形成し、該嵌合凹部内にホ
ルダー嵌合するとともに前記嵌合凹部の底面と前記ホル
ダーと嵌合凹部の底面とをシリンダー軸線方向のボルト
で締着し、前記ホルダーとクランクケースとの間でクラ
ンク軸を軸支するクランク軸の軸受構造において、前記
ホルダーと嵌合凹部の側面とをシリンダー軸線と直交す
る方向のボルトで締着し、前記ホルダーとクランクケー
スの当接面であって、且つ前記シリンダー軸線と直交す
る方向のボルトの周囲の部分に凹部を形成したことを特
徴とする。
(Means for Solving Problems) A fitting recess is formed in a crankcase, a holder is fitted in the fitting recess, and a bottom surface of the fitting recess and a bottom surface of the holder and the fitting recess are aligned with a cylinder axis. Direction, and in the bearing structure of the crankshaft that supports the crankshaft between the holder and the crankcase, tighten the holder and the side surface of the fitting recess with the bolt in the direction orthogonal to the cylinder axis. And a concave portion is formed on the contact surface between the holder and the crankcase and around the bolt in the direction orthogonal to the cylinder axis.

(作用) ホルダーとクランクケースの当接面のボルト周囲に位置
する箇所に凹部を形成したので、ボルトを締付けるとク
ランクケースのうち前記凹部に対応する部分が撓み、こ
の部分の弾性に基づく反力によりボルトは軸方向の力を
受ける。従ってこの反力によりボルトは緩みにくくな
り、簡単、低コストでボルトの緩みを防止することので
きるクランク軸の軸受構造を得ることができる。
(Operation) Since a recess is formed in the contact surface between the holder and the crankcase around the bolt, when the bolt is tightened, the portion of the crankcase corresponding to the recess bends, and the reaction force based on the elasticity of this portion Causes the bolt to receive an axial force. Therefore, this reaction force makes it difficult for the bolt to loosen, and it is possible to obtain a crankshaft bearing structure that can prevent the bolt from loosening easily and at low cost.

(実施例) 以下に本考案の好適一実施例を添付図面に基づき説明す
る。
(Embodiment) A preferred embodiment of the present invention will be described below with reference to the accompanying drawings.

図面中1はクランクケースで、該クランクケース1には
嵌合凹部3が形成され、この嵌合凹部3の底面には断面
半円形状の軸受半部5が形成されている。一方、7は前
記凹部3に嵌入するホルダーで、該ホルダー7にも嵌合
凹部3同様に断面半円形状の軸受半部9が形成されてお
り、前記軸受半部5とこの軸受半部9とにより形成され
る断面円形の軸受部11にメタルベアリング10を介してク
ランク軸12が軸支されている。
In the drawing, reference numeral 1 denotes a crankcase, and a fitting recess 3 is formed in the crankcase 1, and a bearing half 5 having a semicircular cross section is formed on the bottom surface of the fitting recess 3. On the other hand, 7 is a holder that is fitted into the concave portion 3, and a bearing half portion 9 having a semicircular cross section is formed in the holder 7 as in the fitting concave portion 3, and the bearing half portion 5 and the bearing half portion 9 are formed. A crankshaft 12 is rotatably supported by a bearing 11 having a circular cross section formed by a metal bearing 10.

シリンダー軸線方向、即ち、図面上下方向のボルト14、
15及びシリンダー軸線方向と直交する方向、即ち、図面
横方向のボルト16、17、18、19によりクランクケース1
に固定され、ホルダー7とクランクケース1の当接面a,
b,c,d,e,f,g,hには所定間隔の隙間が形成され、又、ホ
ルダー7のクランクケース1側への当接面のうちボルト
16,18周囲に位置する箇所には凹部22,23が形成されてい
る。尚、本実施例ではホルダー7の熱膨張率はクランク
ケース1の熱膨張率よりも小さいものとする。
Bolts 14 in the cylinder axis direction, that is, in the vertical direction of the drawing,
15 and the direction orthogonal to the cylinder axis direction, that is, the horizontal direction in the drawing, by the bolts 16, 17, 18, and 19 the crankcase 1
Is fixed to the contact surface a between the holder 7 and the crankcase 1,
B, c, d, e, f, g, and h are formed with a gap at a predetermined interval, and bolts are included in the contact surface of the holder 7 on the crankcase 1 side.
Recesses 22 and 23 are formed at locations around 16 and 18. In this embodiment, the coefficient of thermal expansion of the holder 7 is smaller than that of the crankcase 1.

以上において本実施例ではホルダー7のボルト16周囲に
位置する箇所に凹部22を形成しているので、ホルダー7
を嵌合凹部3に嵌入してボルト16を締付けると、クラン
クケース1の凹部3に対応する部分30,31は矢印Aの方
向に撓み、そしてボルト16締付後、この部分30,31は弾
性による反力で矢印Bの方向に復帰動しようとする。従
ってこの復帰動によりボルト16には矢印B方向の力が作
用し、ボルト16の緩みが防止されるようになる。これは
ボルト18側についても同様であり、前記同様の作用によ
りボルト18の緩みが防止される。尚本実施例ではボルト
16,18の周囲にのみ凹部を設けたが、この凹部はもちろ
んボルト17,19の周囲に設けても良く、又、凹部はクラ
ンクケース1側に設けても良い。
As described above, in this embodiment, since the concave portion 22 is formed in the portion of the holder 7 located around the bolt 16, the holder 7 is not formed.
When the bolt 16 is fitted into the fitting concave portion 3 and the bolt 16 is tightened, the portions 30 and 31 of the crankcase 1 corresponding to the concave portion 3 are bent in the direction of arrow A, and after the bolt 16 is tightened, the portions 30 and 31 are elastic. It tries to return in the direction of arrow B by the reaction force by. Therefore, due to this return movement, a force in the direction of the arrow B acts on the bolt 16 to prevent the bolt 16 from loosening. This also applies to the bolt 18 side, and the bolt 18 is prevented from being loosened by the same action as described above. In this example, the bolt
Although the recesses are provided only around the peripheries 16 and 18, the recesses may of course be provided around the bolts 17 and 19, or the recesses may be provided on the crankcase 1 side.

ところで、本実施例ではボルト16,17,18,19を締結する
際にはクランクケース1を緩め、隙間a,b,c,d,e,f,gを
なくした状態で行う。従って温度が下がるとクランクケ
ース1とホルダー7との間に隙間a,b,c,d,e,f,gが生じ
ることになる。この状態でエンジンを運転すると燃焼熱
により熱膨張係数の大きいクランクケース1がより大き
く膨張してクランクケース1とホルダー7とが当接し、
隙間a,b,c,d,e,f,gがなくなるが、この隙間a,b,c,d,e,f
gはエンジン運転時にクランクケース1とホルダー7と
がちょうど当接する間隔に設定されており、従ってエン
ジン運転時にクランクケース1がホルダー7を押圧する
ことがなく、クランク軸12に余分な応力がかかるのが防
止される。
By the way, in this embodiment, when the bolts 16, 17, 18, 19 are fastened, the crankcase 1 is loosened and the clearances a, b, c, d, e, f, g are eliminated. Therefore, when the temperature drops, gaps a, b, c, d, e, f, g are created between the crankcase 1 and the holder 7. When the engine is operated in this state, the crankcase 1 having a large coefficient of thermal expansion expands due to combustion heat, and the crankcase 1 and the holder 7 come into contact with each other,
The gaps a, b, c, d, e, f, g disappear, but these gaps a, b, c, d, e, f
g is set to the interval where the crankcase 1 and the holder 7 just contact each other when the engine is operating, so that the crankcase 1 does not press the holder 7 when the engine is operating, so that an extra stress is applied to the crankshaft 12. Is prevented.

(考案の効果) 以上述べたように本考案によればホルダーとクランクケ
ースの当接面のボルト周囲に位置する箇所に凹部を形成
したので、ボルトを締付けるとクランクケースのうち前
記凹部に対応する部分が撓み、この部分の弾性に基づく
反力によりボルトは軸方向の力を受ける。従ってこの反
力によりボルトは緩みにくくなり、簡単、低コストでボ
ルトの緩みを防止することのできるクランク軸の軸受構
造を得ることができる。又、ホルダーとクランクケース
の当接面であって、且つシリンダー軸線と直交する方向
のボルトの周囲の部分に凹部を形成したので、ピストン
往復動や爆発荷重に伴う直交ボルトに加わる剪断荷重を
前記凹部により低下させることができる。
(Effect of the Invention) As described above, according to the present invention, since the recess is formed in the contact surface between the holder and the crankcase around the bolt, when the bolt is tightened, it corresponds to the recess of the crankcase. The portion bends, and the reaction force based on the elasticity of this portion causes the bolt to receive an axial force. Therefore, this reaction force makes it difficult for the bolt to loosen, and it is possible to obtain a crankshaft bearing structure that can prevent the bolt from loosening easily and at low cost. Further, since the recess is formed in the contact surface between the holder and the crankcase and around the bolt in the direction orthogonal to the cylinder axis, the shear load applied to the orthogonal bolt due to the piston reciprocating motion and the explosion load is It can be lowered by the recess.

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

図面はクランク軸の軸受部分の断面図である。 尚、図面中、1はクランクケース、3は嵌合凹部、7は
ホルダー、22,23は凹部である。
The drawing is a sectional view of a bearing portion of a crankshaft. In the drawings, 1 is a crankcase, 3 is a fitting recess, 7 is a holder, and 22 and 23 are recesses.

───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−41412(JP,A) 特公 昭48−16822(JP,B1) 特公 昭46−32854(JP,B1) 実公 昭47−22259(JP,Y1) 実願昭60−179000号(実開昭62−87213 号)の願書に添付した明細書及び図面の内 容を撮影したマイクロフィルム(JP, U) 実願昭59−180467号(実開昭61−94482 号)の願書に添付した明細書及び図面の内 容を撮影したマイクロフィルム(JP, U) 実願昭60−193578号(実開昭62−102019 号)の願書に添付した明細書及び図面の内 容を撮影したマイクロフィルム(JP, U) ─────────────────────────────────────────────────── --Continued from the front page (56) References JP 62-41412 (JP, A) JP 48-16822 (JP, B1) JP 46-32854 (JP, B1) JP 47- 22259 (JP, Y1) Japanese Patent Application No. 60-179000 (Japanese Utility Model Application No. 62-87213) Microfilm (JP, U) Japanese Application No. 59-180467 Microfilm (JP, U) Application No. 60-193578 (Application No. 62-102019) taken from the detailed description and drawings attached to the application No. A microfilm (JP, U) of the contents and drawings attached to

Claims (2)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項1】クランクケースに嵌合凹部を形成し、該嵌
合凹部内にホルダー嵌合するとともに前記嵌合凹部の底
面と前記ホルダーとをシリンダー軸線方向のボルトで締
着し、前記ホルダーとクランクケースとの間でクランク
軸を軸支するクランク軸の軸受構造において、 前記ホルダーと嵌合凹部の側面とをシリンダー軸線と直
交する方向のボルトで締着し、前記ホルダー側面とクラ
ンクケースの当接面であって、且つ前記シリンダー軸線
と直交する方向のボルトの周囲の部分に凹部を形成した
ことを特徴とするクランク軸の軸受構造。
1. A fitting recess is formed in a crankcase, a holder is fitted in the fitting recess, and a bottom surface of the fitting recess and the holder are fastened together by a bolt in a cylinder axial direction to form a holder. In a bearing structure of a crankshaft that pivotally supports a crankshaft with a crankcase, the holder and the side surface of the fitting recess are fastened with a bolt in a direction orthogonal to the cylinder axis, and the holder side surface and the crankcase contact A bearing structure for a crankshaft, characterized in that a concave portion is formed in a portion that is a contact surface and that surrounds the bolt in a direction orthogonal to the cylinder axis.
【請求項2】前記ホルダーとクランクケースの当接面に
はエンジンが冷えた状態で所定間隔離間する隙間を形成
し、ホルダーの熱膨張率をクランクケースの熱膨張率よ
りも小さく設定したことを特徴とする前記実用新案登録
請求の範囲第1項記載のクランク軸の軸受構造。
2. The contact surface between the holder and the crankcase is formed with a gap that is separated by a predetermined distance when the engine is cold, and the coefficient of thermal expansion of the holder is set smaller than that of the crankcase. The crankshaft bearing structure according to claim 1, characterized in that the utility model is registered.
JP1987175186U 1987-11-17 1987-11-17 Crankshaft bearing structure Expired - Lifetime JPH0730978Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1987175186U JPH0730978Y2 (en) 1987-11-17 1987-11-17 Crankshaft bearing structure

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1987175186U JPH0730978Y2 (en) 1987-11-17 1987-11-17 Crankshaft bearing structure

Publications (2)

Publication Number Publication Date
JPH0178720U JPH0178720U (en) 1989-05-26
JPH0730978Y2 true JPH0730978Y2 (en) 1995-07-19

Family

ID=31466994

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1987175186U Expired - Lifetime JPH0730978Y2 (en) 1987-11-17 1987-11-17 Crankshaft bearing structure

Country Status (1)

Country Link
JP (1) JPH0730978Y2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4722259U (en) * 1971-04-08 1972-11-13
JPS6241412A (en) * 1985-08-16 1987-02-23 オリンパス光学工業株式会社 Fixing device

Also Published As

Publication number Publication date
JPH0178720U (en) 1989-05-26

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