JPH03213709A - Crankshaft - Google Patents

Crankshaft

Info

Publication number
JPH03213709A
JPH03213709A JP847290A JP847290A JPH03213709A JP H03213709 A JPH03213709 A JP H03213709A JP 847290 A JP847290 A JP 847290A JP 847290 A JP847290 A JP 847290A JP H03213709 A JPH03213709 A JP H03213709A
Authority
JP
Japan
Prior art keywords
crankshaft
journal
crank
diameter
hole
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.)
Granted
Application number
JP847290A
Other languages
Japanese (ja)
Other versions
JP2992960B2 (en
Inventor
Wataru Fuchigami
渡 渕上
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.)
Yamaha Motor Co Ltd
Original Assignee
Yamaha 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 Yamaha Motor Co Ltd filed Critical Yamaha Motor Co Ltd
Priority to JP2008472A priority Critical patent/JP2992960B2/en
Publication of JPH03213709A publication Critical patent/JPH03213709A/en
Application granted granted Critical
Publication of JP2992960B2 publication Critical patent/JP2992960B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)

Abstract

PURPOSE:To secure sufficient strength even for those products wherein a through hole with which a crankpin engages laps over a part of a journal part in an axial direction by forming a hole whose diameter is smaller than a part having the bottom or the diameter of the crankpin at the engaging part of the crankpin of a crank web. CONSTITUTION:In this engine, the stroke of a piston is short and engaging holes 7, 8 enter to the inside of the diameters of the journal parts 1a, 1b of a crankshaft 1 overlapping each other in the view of an axial direction. Here, the bottom wall part 4a of a crank web 4 interposes between the engaging hole 7 and the journal part 1a, and a projection 5a that is higher than the diameter of the journal part 1b interposes between the engaging hole 8 and the journal part 1b. Because of this, lowering of the strength of the crankshaft 1 (especially the journal parts 1a, 1b) is avoided by these bottom wall part 4a and projection 5a, and the necessary and sufficient strength and rigidity of the crankshaft 1 are secured.

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は、内燃エンジン等のクランク軸に関する。[Detailed description of the invention] (Industrial application field) The present invention relates to a crankshaft for an internal combustion engine or the like.

(従来の技術とその問題点) 第4図に示すように相対向する2枚のクランクウェブ1
04,105をこれらとは別体のクランクピン106に
て連結一体化して成るクランク軸101にあワては、各
クランクウェブ104゜105にはクランクピン106
か嵌合すべき貫通孔107,108か穿設されていたた
め、特にビストンストロークの小さいエンジンにおいて
は、図示のように貫通孔107,108かジャーナル部
101a、101bの一部にラップして形成されること
か起こり得、斯かる場合にはクランク軸101の強度低
下を招くという問題か生ずる。
(Prior art and its problems) As shown in Fig. 4, two crank webs 1 are opposed to each other.
04, 105 connected and integrated by a separate crank pin 106, each crank web 104, 105 has a crank pin 106.
Since the through-holes 107 and 108 to be fitted are bored, especially in engines with a small piston stroke, the through-holes 107 and 108 are formed by wrapping around a part of the journal parts 101a and 101b as shown in the figure. In such a case, a problem arises in that the strength of the crankshaft 101 is reduced.

本発明は上記問題に鑑みてなされたものて、その目的と
する処は、クランクピンか嵌合すべき貫通孔かジャーナ
ル部の一部に軸方肉視てラップするようなものてあって
も、十分な強度を確保することかてきるクランク軸を提
供することにある。
The present invention has been made in view of the above problems, and its purpose is to provide a through hole into which a crank pin is to be fitted, or a portion of a journal portion that wraps when viewed in the axial direction. The object of the present invention is to provide a crankshaft that can ensure sufficient strength.

(課題を解決するための手段) 上記目的を達成すべく本発明は、相対向する2枚のクラ
ンクウェブを別体のクランクピンにて連結一体化して成
るクランク軸において、前記クランクウェブのクランク
ビン嵌合部に有底部又はクランクピン径よりも小径の孔
を形成したことをその特徴とする。
(Means for Solving the Problems) In order to achieve the above object, the present invention provides a crankshaft in which two opposed crank webs are connected and integrated by separate crank pins, and a crank pin of the crank webs is provided. The fitting part is characterized by having a bottomed part or a hole smaller in diameter than the crank pin diameter.

(作用) 本発明によれば、クランクウェブに形成されたクランク
ピンの嵌合孔か軸方向視てジャーナル部の一部にラップ
しているようなりランク軸てあっでも、嵌合孔とジャー
ナル部の間には少なくともジャーナル径よりも高い壁か
形成されるため、この壁によって当該クランク軸(特に
、ジャーナル部)の強度低下か免れ、クランク軸には十
分な強度及び剛性か確保される。
(Function) According to the present invention, the crank pin fitting hole formed in the crank web overlaps a part of the journal portion when viewed in the axial direction, so that even if the crank shaft is located, the fitting hole and the journal portion overlap. A wall higher than at least the journal diameter is formed between them, so that the strength of the crankshaft (particularly the journal portion) is prevented from decreasing, and sufficient strength and rigidity are ensured for the crankshaft.

(実施例) 以下に本発明の一実施例を添付図面に基づいて説明する
(Example) An example of the present invention will be described below based on the accompanying drawings.

第1図は本発明に係るクランク軸を示す内燃エンジン要
部の破断側面図、第2図、第3図はそれぞれ第1図の■
−■線、m−m線断面図である。
Fig. 1 is a cutaway side view of the main parts of an internal combustion engine showing a crankshaft according to the present invention, and Figs. 2 and 3 are respectively shown in Fig. 1.
-■ line, mm line sectional view.

第1図において、lは本発明に係るクランク軸であって
、これはクランクケース2内にボールベアリング3.3
にて回転自在に支承されて収納されている。
In FIG. 1, l is a crankshaft according to the present invention, which has a ball bearing 3.3 in the crankcase 2.
It is rotatably supported and stored.

ところで、上記クランク軸lは相対向するクランクウェ
ブ4,5をこれらとは別体のクランクピン6にて連結一
体化して構成されるか、一方のクランクウェブ4にはク
ランクピン6か嵌合すべき有底状の嵌合孔7か形成され
ており、ウェブ4には肉厚tの底壁部4aか歿されてい
る。
By the way, the above-mentioned crankshaft l is constructed by integrally connecting the opposing crank webs 4 and 5 with a separate crank pin 6, or the crank pin 6 is fitted into one of the crank webs 4. A bottomed fitting hole 7 is formed in the web 4, and a bottom wall portion 4a having a thickness t is formed in the web 4.

又、他方のクランクウェブ5には同しくクランクピン6
か嵌合すべき嵌合孔8か形成されているか、該嵌合孔8
の底部にはクランクピン6の直径よりも小さい直径の円
孔9か穿設されており、ウェブ5にはクランクピン6の
端部外周を被うリンク状の突起5aか形成されている。
Further, the other crank web 5 also has a crank pin 6.
Whether the fitting hole 8 to be fitted is formed or not, the fitting hole 8 to be fitted is formed.
A circular hole 9 having a diameter smaller than that of the crank pin 6 is bored in the bottom of the crank pin 6, and a link-shaped projection 5a is formed in the web 5 to cover the outer periphery of the end of the crank pin 6.

而して、クランクピン6にはコンロッド1O110の大
端部か支承されており、該クランクピン6とクランク軸
lにはコンロッド10.10の大端部にオイルを供給す
るための油路11,12゜13.14か形成されている
The big end of the connecting rod 1O110 is supported on the crank pin 6, and the crank pin 6 and the crankshaft l have an oil passage 11 for supplying oil to the big end of the connecting rod 10.10. It is formed at 12°, 13.14°.

又、クランク軸1の一端部には、スタータギヤ15及び
発電機ロータ16か設けられている。そして、スタータ
ギヤ15はベアリング17を介してクランク軸1に自由
回転自在に支承されており、発電機口〜夕16はクラン
ク軸1と一体に回転すべくこれに結着されており、両者
の間にはワンウェイクラッチ18か介設されている。
Furthermore, a starter gear 15 and a generator rotor 16 are provided at one end of the crankshaft 1. The starter gear 15 is rotatably supported by the crankshaft 1 via a bearing 17, and the generator port 16 is connected to the crankshaft 1 so as to rotate together with the generator port 1, and between the two. A one-way clutch 18 is interposed therein.

而して、上記発電機ロータ16においては、ボス部16
aにドラム状のロータ部16bをメタルフローにて結着
しているため、従来要していたボルトやリベット等の締
結部品か不要となり1部品点数を削減することかてきる
とともに、構造を単純化して取付スペースもコンパクト
化することかてきる。
Therefore, in the generator rotor 16, the boss portion 16
Since the drum-shaped rotor part 16b is connected to the drum-shaped rotor part 16b by metal flow, there is no need for fastening parts such as bolts and rivets that were required in the past, reducing the number of parts and simplifying the structure. The installation space can also be made more compact.

又、前記ワンウェイクラッチ18はそのリテーナ18a
を発電機ロータボス部16aにクリップ式に嵌め込むこ
とによってワンタッチて組み付けられるため、これの組
付性か高められる。
Further, the one-way clutch 18 has a retainer 18a.
Since it can be assembled with one touch by clip-fitting into the generator rotor boss portion 16a, the ease of assembly is improved.

ところて、本実施例に係るエンジンはビストンストロー
クか小さく、第2図及び第3図にも示すように前記嵌合
孔7,8かクランク軸lのジャーナル部1a、lbの径
の内側にまて入り込み、軸方向視て両者かオーバーシッ
プしているC第2図、第3図に両者のオーバラップ部分
なa、bにて示す)。
However, the engine according to this embodiment has a small piston stroke, and as shown in FIGS. 2 and 3, the fitting holes 7 and 8 are located inside the diameter of the journal portions 1a and lb of the crankshaft l. When viewed in the axial direction, both are overshipped (C in Figs. 2 and 3, where the overlapping portions of the two are indicated by a and b).

然るに1本実施例に3いては、嵌合孔7とジャーナル部
1aとの間にはウェブ4の底壁部4aか介在し、嵌合孔
8とジャーナル部1bとの間にはジャーナル部1bの径
よりも高い突起5aか介在するため、これら底壁部4a
及び突起5aによってクランク軸1(特に、ジャーナル
部1a。
However, in the third embodiment, the bottom wall part 4a of the web 4 is interposed between the fitting hole 7 and the journal part 1a, and the journal part 1b is interposed between the fitting hole 8 and the journal part 1b. Because there are protrusions 5a higher than the diameter of these bottom wall parts 4a,
and the crankshaft 1 (particularly the journal portion 1a) by the protrusion 5a.

lb)の強度低下が免れ、該クランク軸lには必要十分
な強度及び剛性か確保される。尚、クランクウェブ4,
5にそれぞれ底壁部4a、突起5aを形成すると、クラ
ンクピン6のこれらクランクウェブ4,5に対する軸方
向の嵌合長か短くなるか、クランクピン6の径を大きく
してこれの嵌合面積を大きく取れば問題は生しない。
lb) is avoided, and the necessary and sufficient strength and rigidity of the crankshaft l is ensured. In addition, crank web 4,
If a bottom wall portion 4a and a protrusion 5a are formed on each of the crank pins 4 and 5, the fitting length of the crank pin 6 in the axial direction with respect to these crank webs 4 and 5 will be shortened, or the diameter of the crank pin 6 may be increased to increase the fitting area. If you take it large, there will be no problem.

ところで、以上の実施例ては、一方のクランクウェブ4
には底壁部4aを、他方のクランクウェブ5には突起5
aをそれぞれ形成したか、両つェツ4,5に底壁部4a
或いは突起5aを形成するようにしてもよいことは勿論
である。
By the way, in the above embodiment, one crank web 4
has a bottom wall portion 4a, and the other crank web 5 has a protrusion 5.
A is formed respectively, or a bottom wall part 4a is formed on both sets 4 and 5.
Alternatively, it is of course possible to form a protrusion 5a.

(発明の効果) 以上の説明て明らかな如く本発明によれば、相対向する
2枚のクランクウェブを別体のクランクピンにて連結一
体化して成るクランク軸において、前記クランクラエフ
のクランクピン嵌合部に有底部又はクランクピン径より
も小径の孔を形成したため、クランクピンか嵌合すべき
貫通孔かジャーナル部の一部に軸方同視てラップするよ
うなりランク軸てあっても、その強度及び剛性を高く保
つことかてきるという効果か得られる。
(Effects of the Invention) As is clear from the above description, according to the present invention, in a crankshaft in which two opposing crank webs are connected and integrated by separate crank pins, the crank pin fitting of the crank web is achieved. Since the part has a bottomed part or a hole with a diameter smaller than the crank pin diameter, the strength of the crank shaft is reduced even if the crank pin is fitted into the through hole or part of the journal part that overlaps in the axial direction. Also, the effect of maintaining high rigidity can be obtained.

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

第1図は本発明に係るクランク軸を示す内燃エンジン要
部の破断側面図、第2図、第3図はそれぞれ第1図の■
−■線、■−■線断面図、第4図は従来のクランク軸要
部の断面図である。 l・・・クランク軸、4,5・・・クランクラエフ、6
・・・クランクピン、7.8・・・嵌合孔、9・・・円
孔(クランクピンよりも小径の孔)。
Fig. 1 is a cutaway side view of the main parts of an internal combustion engine showing a crankshaft according to the present invention, and Figs. 2 and 3 are respectively shown in Fig. 1.
-■ line, ■-■ line cross-sectional views, and FIG. 4 are cross-sectional views of the main parts of a conventional crankshaft. l...Crankshaft, 4, 5...Crank Ef, 6
... Crank pin, 7.8 ... Fitting hole, 9 ... Circular hole (hole with a smaller diameter than the crank pin).

Claims (1)

【特許請求の範囲】[Claims]  相対向する2枚のクランクウェブを別体のクランクピ
ンにて連結一体化して成るクランク軸において、前記ク
ランクウェブのクランクピン嵌合部に有底部又はクラン
クピン径よりも小径の孔を形成したことを特徴とするク
ランク軸。
In a crankshaft in which two opposing crank webs are connected and integrated by separate crank pins, a bottomed part or a hole smaller in diameter than the crank pin diameter is formed in the crank pin fitting part of the crank web. A crankshaft featuring
JP2008472A 1990-01-19 1990-01-19 Assembled crankshaft for internal combustion engine Expired - Fee Related JP2992960B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2008472A JP2992960B2 (en) 1990-01-19 1990-01-19 Assembled crankshaft for internal combustion engine

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2008472A JP2992960B2 (en) 1990-01-19 1990-01-19 Assembled crankshaft for internal combustion engine

Publications (2)

Publication Number Publication Date
JPH03213709A true JPH03213709A (en) 1991-09-19
JP2992960B2 JP2992960B2 (en) 1999-12-20

Family

ID=11694063

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2008472A Expired - Fee Related JP2992960B2 (en) 1990-01-19 1990-01-19 Assembled crankshaft for internal combustion engine

Country Status (1)

Country Link
JP (1) JP2992960B2 (en)

Also Published As

Publication number Publication date
JP2992960B2 (en) 1999-12-20

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