JP2009014145A - Support structure of crankshaft and bearing for crankshaft - Google Patents

Support structure of crankshaft and bearing for crankshaft Download PDF

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Publication number
JP2009014145A
JP2009014145A JP2007178559A JP2007178559A JP2009014145A JP 2009014145 A JP2009014145 A JP 2009014145A JP 2007178559 A JP2007178559 A JP 2007178559A JP 2007178559 A JP2007178559 A JP 2007178559A JP 2009014145 A JP2009014145 A JP 2009014145A
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crankshaft
outer ring
housing
needle roller
divided body
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JP5012265B2 (en
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Masahito Yoshida
雅人 吉田
Susumu Ryu
劉　　軍
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NSK Ltd
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NSK Ltd
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C33/00—Parts of bearings; Special methods for making bearings or parts thereof
    • F16C33/30—Parts of ball or roller bearings
    • F16C33/58—Raceways; Race rings
    • F16C33/60—Raceways; Race rings divided or split, e.g. comprising two juxtaposed rings

Abstract

<P>PROBLEM TO BE SOLVED: To provide a support structure of crankshaft, capable of smoothly rotatably supporting a crankshaft while inhibiting noise or flaking, and a bearing for crankshaft. <P>SOLUTION: The crankshaft 11 is rotatably supported within a housing 16 of a crank case by needle roller bearings 21 and 22 provided on a plurality of journal parts 12a and 12b provided with an axial space. The journal part 12a located at both end sides of the crankshaft is supported by the needle roller bearing 21 provided an integrated outer ring 31 composed of a single member, and the remaining journal part 12b is supported by the needle roller bearing 22 provided with a split type outer ring 41. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

本発明は、自動車用エンジン等の多気筒内燃機関のクランクシャフトを支持するクランクシャフトの支持構造及びクランクシャフト用軸受に関する。   The present invention relates to a crankshaft support structure for supporting a crankshaft of a multi-cylinder internal combustion engine such as an automobile engine, and a crankshaft bearing.

近年、自動車用エンジンは、環境問題などの取り組みのひとつとして、低燃費化などが進められており、クランクシャフトの支持部であるジャーナル部に用いられる軸受として、すべり軸受に代えて抵抗の少ない転がり軸受が用いられている。   In recent years, automobile engines have been promoted to reduce fuel consumption as one of the environmental and other efforts, and rolling with less resistance is used instead of plain bearings as bearings used in journals that support crankshafts. A bearing is used.

このクランクシャフトのジャーナル部に使用する軸受は、組立性の問題から２分割のものが用いられており、転がり軸受の場合、軌道輪である外輪の分割方法として、一体型軌道輪を、いわゆる「自然割り」となる方法で中心線上にて切断する方法がとられている（例えば、特許文献１参照）。また、他の分割方法としては、外輪の分割線が軸方向から見てクランク軸状に切断するものが知られている（例えば、特許文献２参照）。
特開平６−８１８４６号公報 特開２００３−２１４４４２号公報 The bearing used for the journal portion of the crankshaft is divided into two parts because of the problem of assemblability. In the case of a rolling bearing, as a method for dividing the outer ring, which is a race ring, an integral race ring is used as a so-called “ A method of cutting on the center line by a method of “natural split” is used (for example, see Patent Document 1). Further, as another division method, a method in which a division line of the outer ring is cut into a crankshaft shape when viewed from the axial direction is known (for example, see Patent Document 2).
JP-A-6-81846 JP 2003-214442 A

しかしながら、図９（ａ）に示すように、外輪１が自然割りによって上側分割体２と下側分割体３に２等分された軸受４では、ミクロン単位の段差が不可避的に発生してしまう。特に、上ハウジング６と下ハウジング７とに分割されるハウジング５に、このように外輪１が分割された軸受４のみを装着した場合、上ハウジング６と下ハウジング７とのずれによって段差が重畳される虞がある。この場合、図９（ｂ）に示すように、軸受４の外輪１を構成する上側分割体２と下側分割体３との継ぎ目部分Ｓに形成される端部エッジに転動体８が衝突し、騒音が発生したり、衝突箇所からフレーキングが発生する恐れがある。   However, as shown in FIG. 9A, in the bearing 4 in which the outer ring 1 is divided into two equal parts by natural splitting into the upper divided body 2 and the lower divided body 3, a step in units of microns is inevitably generated. . In particular, when only the bearing 4 in which the outer ring 1 is divided in this way is mounted on the housing 5 divided into the upper housing 6 and the lower housing 7, a step is overlapped due to the deviation between the upper housing 6 and the lower housing 7. There is a risk. In this case, as shown in FIG. 9 (b), the rolling element 8 collides with an end edge formed at the joint portion S between the upper divided body 2 and the lower divided body 3 constituting the outer ring 1 of the bearing 4. , Noise may be generated and flaking may occur from the collision point.

さらに、シャフト９と外輪１との間の軌道における転動体８の径方向のクリアランスであるラジアル隙間よりも上側分割体２と下側分割体３とのずれが大きいと、図９（ａ）に示すように、継ぎ目部分Ｓにてラジアル隙間がなくなり、シャフト９と外輪１との間にて転動体８が拘束され、回転不良を起こす虞もある。   Further, when the deviation between the upper divided body 2 and the lower divided body 3 is larger than the radial gap, which is the radial clearance of the rolling element 8 in the track between the shaft 9 and the outer ring 1, FIG. As shown, the radial gap is eliminated at the joint portion S, and the rolling element 8 is restrained between the shaft 9 and the outer ring 1, which may cause rotation failure.

一方、特許文献２に記載の様に、両端をクランク軸状に切断して分割する外輪の場合には、両端の加工が非常に煩雑なものとなる。   On the other hand, as described in Patent Document 2, in the case of an outer ring in which both ends are cut into a crankshaft and divided, processing of both ends becomes very complicated.

本発明は上記事情に鑑みてなされたもので、その目的は、騒音やフレーキングを抑制しつつクランクシャフトを円滑に回転可能に支持することが可能なクランクシャフトの支持構造及びクランクシャフト用軸受を提供することにある。   The present invention has been made in view of the above circumstances, and an object thereof is to provide a crankshaft support structure and a crankshaft bearing capable of smoothly supporting a crankshaft while suppressing noise and flaking. It is to provide.

本発明の上記目的は、下記の構成により達成される。
（１） 軸方向に間隔をあけて複数のジャーナル部が設けられたクランクシャフトを、前記ジャーナル部に設けられた複数の軸受によってクランクケースのハウジング内で回転可能に支持するクランクシャフトの支持構造であって、
前記クランクシャフトの両端側に位置する前記ジャーナル部は、単一部材からなる一体型の外輪を備えた前記軸受によって支持され、残りの前記ジャーナル部は、分割型の外輪を備える前記軸受によって支持されることを特徴とするクランクシャフトの支持構造。
（２） 前記分割型の外輪は、非対称に２分割されていることを特徴とする（１）に記載のクランクシャフトの支持構造。
（３） 前記分割型の外輪を構成する周方向寸法が長い一方の分割体は、その両端における外周面に、端部へ向かって次第に径方向内方へ傾斜するテーパ面を有することを特徴とする（２）に記載のクランクシャフトの支持構造。
（４） （１）に記載のクランクシャフトの支持構造に使用されることを特徴とするクランクシャフト用軸受。 The above object of the present invention is achieved by the following configurations.
(1) A crankshaft support structure in which a crankshaft provided with a plurality of journal portions spaced apart in the axial direction is rotatably supported within a housing of a crankcase by a plurality of bearings provided in the journal portions. There,
The journal portions located at both ends of the crankshaft are supported by the bearing having an integral outer ring made of a single member, and the remaining journal portions are supported by the bearing having a split outer ring. A support structure for a crankshaft.
(2) The crankshaft support structure according to (1), wherein the split outer ring is split into two asymmetrically.
(3) One of the divided bodies having a long circumferential dimension that constitutes the split outer ring has a tapered surface that is gradually inclined radially inward toward the end portion on the outer circumferential surface at both ends thereof. The crankshaft support structure according to (2).
(4) A crankshaft bearing used in the crankshaft support structure according to (1).

本発明のクランクシャフトの支持構造によれば、ハウジングが分割タイプであっても、クランクシャフトの両端側に位置するジャーナル部を支持する、一体型の外輪を備えた軸受によって上下のハウジングを位置ずれなく組み付けることができ、これにより、残りのジャーナル部を支持する軸受の分割型の外輪を位置ずれなく環状に設置することができる。従って、クランクシャフトを全てのジャーナル部にて、騒音やフレーキングを抑制しつつ円滑に回転可能に支持することができる。   According to the crankshaft support structure of the present invention, even if the housing is a split type, the upper and lower housings are misaligned by the bearings with integral outer rings that support the journal portions located at both ends of the crankshaft. As a result, it is possible to install the split outer ring of the bearing supporting the remaining journal portion in an annular shape without positional deviation. Therefore, the crankshaft can be supported in all journal portions so as to be smoothly rotatable while suppressing noise and flaking.

（第１実施形態）
以下、本発明の第１実施形態に係るクランクシャフトの支持構造について、図面を参照して詳細に説明する。図１に示すクランクシャフト１１は、多気筒の内燃機関に用いられており、同一軸線上に、軸方向に間隔をあけて複数のジャーナル部１２ａ，１２ｂが形成されている。 (First embodiment)
Hereinafter, a support structure for a crankshaft according to a first embodiment of the present invention will be described in detail with reference to the drawings. A crankshaft 11 shown in FIG. 1 is used in a multi-cylinder internal combustion engine, and a plurality of journal portions 12a and 12b are formed on the same axis line at intervals in the axial direction.

このクランクシャフト１１には、各気筒の図示しないピストンが取り付けられるコンロッド１３が連結されるクランクピン部１４が、ジャーナル部１２ａ，１２ｂの軸心に対して偏心した位置に形成されている。また、これらクランクピン部１４の両側には、クランクシャフト１１のバランスをとる一対のクランクウェブ１５が形成されている。   The crankshaft 11 is formed with a crankpin portion 14 to which a connecting rod 13 to which a piston (not shown) of each cylinder is attached is connected to the crankshaft 11 at a position eccentric with respect to the axial centers of the journal portions 12a and 12b. A pair of crank webs 15 that balance the crankshaft 11 are formed on both sides of the crankpin portions 14.

上記のクランクシャフト１１は、クランクケースのハウジング１６内に配置されており、各ジャーナル部１２ａ，１２ｂに設けられたラジアル針状ころ軸受２１，２２によってクランクシャフト１１がハウジング１６内にて回転可能に支持されている。   The crankshaft 11 is disposed in the housing 16 of the crankcase, and the crankshaft 11 is rotatable in the housing 16 by the radial needle roller bearings 21 and 22 provided in the journal portions 12a and 12b. It is supported.

図２及び図３で具体的に示すように、ハウジング１６は、クランクシャフト１１の軸心を含む水平面にて上ハウジング２５と下ハウジング２６とに分割されており、各ジャーナル部１２ａ，１２ｂにて、上ハウジング２５に形成された円弧状の保持凹部２７ａ，２７ｂと、下ハウジング２６に形成された円弧状の保持凹部２８ａ，２８ｂとによって針状ころ軸受２１，２２が上下から保持されている。   As specifically shown in FIGS. 2 and 3, the housing 16 is divided into an upper housing 25 and a lower housing 26 along a horizontal plane including the axis of the crankshaft 11, and each of the journal portions 12a and 12b. The needle roller bearings 21 and 22 are held from above and below by the arc-shaped holding recesses 27 a and 27 b formed in the upper housing 25 and the arc-shaped holding recesses 28 a and 28 b formed in the lower housing 26.

図２に示すように、クランクシャフト１１の両端側に位置するジャーナル部１２ａに設けられる針状ころ軸受２１は、単一部材からなる一体型の外輪３１と、この外輪３１の内周面とジャーナル部１２ａの外周面との間に配置される複数の針状ころ３２と、これら針状ころ３２を周方向に間隔をあけて転動可能に保持する保持器３３と、を備える。外輪３１は、その上半分が上ハウジング２５の保持凹部２７ａに嵌合され、下半分が下ハウジング２６の保持凹部２８ａに嵌合される。   As shown in FIG. 2, the needle roller bearing 21 provided in the journal portion 12 a located on both ends of the crankshaft 11 includes an integrated outer ring 31 made of a single member, an inner peripheral surface of the outer ring 31, and a journal. A plurality of needle rollers 32 disposed between the outer peripheral surface of the portion 12a and a retainer 33 that holds the needle rollers 32 at intervals in the circumferential direction so as to be able to roll. The upper half of the outer ring 31 is fitted into the holding recess 27 a of the upper housing 25, and the lower half is fitted into the holding recess 28 a of the lower housing 26.

また、図３に示すように、クランクシャフト１１の両端側を除く中間部分の残りのジャーナル部１２ｂに設けられる針状ころ軸受２２は、自然割り等によって上側分割体４１ａと下側分割体４１ｂとに２等分される分割型の外輪４１と、この外輪４１の内周面とジャーナル部１２ｂの外周面との間に配置される複数の針状ころ４２と、これら針状ころ４２を周方向に間隔をあけて転動可能に保持する分割型の保持器４３と、を備える。外輪４１は、上側分割体４１ａと下側分割体４１ｂとを組み合わせることにより、環状に形成され、上側分割体４１ａが上ハウジング２５の保持凹部２７ｂに嵌合され、下側分割体４１ｂが下ハウジング２６の保持凹部２８ｂに嵌合されている。   Further, as shown in FIG. 3, the needle roller bearing 22 provided in the remaining journal portion 12b of the intermediate portion excluding both ends of the crankshaft 11 is divided into an upper divided body 41a and a lower divided body 41b by natural splitting or the like. A split-type outer ring 41 divided into two, a plurality of needle rollers 42 disposed between the inner peripheral surface of the outer ring 41 and the outer peripheral surface of the journal portion 12b, and the needle rollers 42 in the circumferential direction. And a split type retainer 43 that is held so as to be able to roll with a gap. The outer ring 41 is formed in an annular shape by combining the upper divided body 41a and the lower divided body 41b, the upper divided body 41a is fitted into the holding recess 27b of the upper housing 25, and the lower divided body 41b is connected to the lower housing. 26 is fitted into the holding recess 28b.

次に、クランクピン部１４にコンロッド１３を取り付けたクランクシャフト１１をハウジング１６内に組み込む場合について説明する。   Next, the case where the crankshaft 11 having the connecting rod 13 attached to the crankpin portion 14 is incorporated in the housing 16 will be described.

下ハウジング２６の所定の保持凹部２８ｂに針状ころ軸受２２の外輪４１の下側分割体４１ｂを保持させた状態にて、両端側のジャーナル部１２ａに針状ころ軸受２１を装着したクランクシャフト１１を下ハウジング２６に設置する。   In a state where the lower divided body 41b of the outer ring 41 of the needle roller bearing 22 is held in a predetermined holding recess 28b of the lower housing 26, the crankshaft 11 in which the needle roller bearings 21 are mounted on the journal portions 12a on both ends. Is installed in the lower housing 26.

このようにすると、両端側のジャーナル部１２ａに装着した針状ころ軸受２１の一体型の外輪３１が、下ハウジング２６の両端側の保持凹部２８ａに嵌合され、また、中間部分のジャーナル部１２ｂに、保持凹部２８ｂに保持された針状ころ軸受２２の外輪４１の下側分割体４１ｂが装着される。   In this way, the integral outer ring 31 of the needle roller bearing 21 attached to the journal portions 12a on both ends is fitted into the holding recesses 28a on both ends of the lower housing 26, and the intermediate journal portion 12b. The lower divided body 41b of the outer ring 41 of the needle roller bearing 22 held in the holding recess 28b is mounted.

この状態にて、上ハウジング２５の中間部分の保持凹部２７ｂに、針状ころ軸受２２の外輪４１の上側分割体４１ａを嵌合させ、この上ハウジング２５を下ハウジング２６に配設する。   In this state, the upper divided body 41 a of the outer ring 41 of the needle roller bearing 22 is fitted into the holding recess 27 b in the intermediate portion of the upper housing 25, and the upper housing 25 is disposed in the lower housing 26.

このようにすると、上ハウジング２５の両端の保持凹部２７ａに、両端側のジャーナル部１２ａに装着された針状ころ軸受２１の外輪３１が嵌合するとともに、中間部分の保持凹部２７ｂに嵌合された針状ころ軸受２２の外輪４１の上側分割体４１ａが下ハウジング２６の中間部分の保持凹部２８ｂに装着された外輪４１の下側分割体４１ｂに組み合わされる。なお、針状ころ軸受２２の針状ころ４２は、分割型の保持器４３に保持されながら、下側分割体４１ｂ、上側分割体４１ａの装着と共に、ハウジング内１６に組み込まれる。   In this way, the outer ring 31 of the needle roller bearing 21 mounted on the journal portion 12a on both ends is fitted to the holding recess 27a on both ends of the upper housing 25, and is fitted on the holding recess 27b on the intermediate portion. The upper divided body 41 a of the outer ring 41 of the needle roller bearing 22 is combined with the lower divided body 41 b of the outer ring 41 attached to the holding recess 28 b in the intermediate portion of the lower housing 26. The needle roller 42 of the needle roller bearing 22 is incorporated in the housing 16 together with the lower divided body 41b and the upper divided body 41a while being held by the split type retainer 43.

ここで、クランクシャフト１１の両端側では、図４（ａ）に示すように、針状ころ軸受２１の上方側から上ハウジング２５の保持凹部２７ａを被せると、図４（ｂ）に示すように、保持凹部２７ａの内周面が一体型の外輪３１の外周面に接触する。これにより、図４（ｃ）に示すように、上ハウジング２５は、保持凹部２７ａの内周面が一体型の外輪３１の外周面に接触されることにより下ハウジング２６に位置決めされ、図４（ｄ）に示すように、保持凹部２７ａの軸心が外輪３１の軸心に合わせられた状態で組み付けられる。   Here, at both ends of the crankshaft 11, as shown in FIG. 4 (a), when the holding recess 27a of the upper housing 25 is covered from the upper side of the needle roller bearing 21, as shown in FIG. 4 (b). The inner peripheral surface of the holding recess 27 a contacts the outer peripheral surface of the integrated outer ring 31. As a result, as shown in FIG. 4C, the upper housing 25 is positioned on the lower housing 26 when the inner peripheral surface of the holding recess 27a is brought into contact with the outer peripheral surface of the integrated outer ring 31, and FIG. As shown in d), the holding recess 27 a is assembled in a state where the axis is aligned with the axis of the outer ring 31.

これにより、上ハウジング２５及び下ハウジング２６が位置ずれなく組み付けられるため、中間部分のジャーナル部１２ｂに設けられる針状ころ軸受２２では、上ハウジング２５の保持凹部２７ｂに嵌合される外輪４１の上側分割体４１ａと、下ハウジング２６の保持凹部２８ｂに嵌合される外輪４１の下側分割体４１ｂとが、位置ずれのない軌道面を構成する。   As a result, the upper housing 25 and the lower housing 26 are assembled without misalignment. Therefore, in the needle roller bearing 22 provided in the intermediate journal portion 12b, the upper side of the outer ring 41 fitted in the holding recess 27b of the upper housing 25 is provided. The divided body 41a and the lower divided body 41b of the outer ring 41 fitted in the holding recess 28b of the lower housing 26 constitute a raceway surface with no positional deviation.

以上説明したように、本実施形態のクランクシャフトの支持構造によれば、ハウジング１６が分割タイプであっても、両端側のジャーナル部１２ａを支持する針状ころ軸受２１の一体型の外輪３１によって上ハウジング２５及び下ハウジング２６を位置ずれなく組み付けることができ、残りのジャーナル部１２ｂを支持する針状ころ軸受２２の分割型の外輪４１も位置ずれなく環状に設置される。これにより、クランクシャフト１１は、全てのジャーナル部１２ａ，１２ｂにて、騒音やフレーキングを抑制しつつ円滑に回転可能に支持される。   As described above, according to the crankshaft support structure of the present embodiment, even if the housing 16 is a split type, the integral outer ring 31 of the needle roller bearing 21 that supports the journal portions 12a on both ends is used. The upper housing 25 and the lower housing 26 can be assembled without displacement, and the split outer ring 41 of the needle roller bearing 22 that supports the remaining journal portion 12b is also annularly installed without displacement. Thereby, the crankshaft 11 is supported by all the journal parts 12a and 12b so that it can rotate smoothly while suppressing noise and flaking.

（第２実施形態）
次に、本発明の第２実施形態に係るクランクシャフトの支持構造について、図面を参照して詳細に説明する。なお、第１実施形態と同等部分については同一符号を付して、説明を省略或は簡略化する。 (Second Embodiment)
Next, a crankshaft support structure according to a second embodiment of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected about a part equivalent to 1st Embodiment, and description is abbreviate | omitted or simplified.

本実施形態では、中間部分のジャーナル部１２ｂを支持する針状ころ軸受の分割型の外輪の構成において第１実施形態のものと異なる。即ち、本実施形態の針状ころ軸受５１では、分割型の外輪５２が互いに非対称の上側分割体５２ａと下側分割体５２ｂとに分割されている。   In the present embodiment, the configuration of the split outer ring of the needle roller bearing that supports the intermediate journal portion 12b is different from that of the first embodiment. That is, in the needle roller bearing 51 of the present embodiment, the split outer ring 52 is divided into an asymmetric upper divided body 52a and a lower divided body 52b.

下側分割体５２ｂは、上側分割体５２ａより周方向長さが長く形成されており、この外輪５２の上側分割体５２ａと下側分割体５２ｂとの分割箇所は、ジャーナル部１２ｂの軸心を通る水平面から上方にずらされている。   The lower divided body 52b is formed to have a longer circumferential length than the upper divided body 52a, and the upper divided body 52a and the lower divided body 52b of the outer ring 52 are divided at the axial center of the journal portion 12b. It is shifted upward from the horizontal plane.

このため、クランクシャフト１１をハウジング１６内に組み込む際に、クランクシャフト１１の中間部分では、図６（ａ）に示すように、下側分割体５２ｂが下ハウジング２６の保持凹部２８ｂに嵌合された状態では、下側分割体５２ｂの両端部は下ハウジング２６の保持凹部２８ｂから上方へ突出する。   For this reason, when the crankshaft 11 is assembled in the housing 16, the lower divided body 52b is fitted into the holding recess 28b of the lower housing 26 at the intermediate portion of the crankshaft 11, as shown in FIG. In this state, both end portions of the lower divided body 52 b protrude upward from the holding recess 28 b of the lower housing 26.

そして、針状ころ軸受５１の上方側から上ハウジング２５の保持凹部２７ｂを被せると、図６（ｂ）に示すように、保持凹部２７ｂ内に針状ころ軸受５１の下側分割体５２ｂの両端が入り込む。これにより、上ハウジング２５が下ハウジング２６に対して下側分割体５２ｂの両端部分にて位置決めされながら近接され、図６（ｃ）に示すように、下側分割体５２ｂと上側分割体５２ａとがずれることなく組み合わされるとともに、上ハウジング２５と下ハウジング２６とが、保持凹部２７ｂの軸心が下側分割体５２ｂと上側分割体５２ａとからなる外輪５１の軸心に合わせられた状態で組み付けられる。   Then, when the holding recess 27b of the upper housing 25 is covered from the upper side of the needle roller bearing 51, both ends of the lower divided body 52b of the needle roller bearing 51 are placed in the holding recess 27b as shown in FIG. 6 (b). Enters. Accordingly, the upper housing 25 is brought close to the lower housing 26 while being positioned at both ends of the lower divided body 52b, and as shown in FIG. 6C, the lower divided body 52b and the upper divided body 52a And the upper housing 25 and the lower housing 26 are assembled in a state where the axis of the holding recess 27b is aligned with the axis of the outer ring 51 including the lower divided body 52b and the upper divided body 52a. It is done.

以上説明したように、本実施形態のクランクシャフトの支持構造によれば、針状ころ軸受５１の分割型の外輪５２が互いに非対称に形成されるので、中間部分の残りのジャーナル部１２ｂを支持する針状ころ軸受５１の分割型の外輪５２をより確実に位置ずれなく環状に設置することができる。これにより、クランクシャフト１１は、全てのジャーナル部１２ａ，１２ｂにて、騒音やフレーキングを抑制しつつ円滑に回転可能に支持される。   As described above, according to the crankshaft support structure of the present embodiment, the split outer ring 52 of the needle roller bearing 51 is formed asymmetrically with each other, so that the remaining journal portion 12b in the intermediate portion is supported. The split outer ring 52 of the needle roller bearing 51 can be more securely installed in an annular shape without misalignment. Thereby, the crankshaft 11 is supported by all the journal parts 12a and 12b so that it can rotate smoothly while suppressing noise and flaking.

ここで、図７は、針状ころ軸受５１の変形例を示すもので、この針状ころ軸受５１の分割型の外輪５２では、下側分割体５２ｂの両端における外周面に、端部へ向かって次第に径方向内方へ傾斜するテーパ面５３が形成されている。テーパ面５３の円周方向長さは、上ハウジング２５の保持凹部２７ｂとの係り代ａを残すように、下側分割体５２ｂの両端面が水平となるように配置された際の保持凹部２８ｂからの突出量ｂよりも短く設定されている。なお、上側分割体５２ａの両端は、下側分割体５２ｂとの接触面に沿って平坦に形成されている。   Here, FIG. 7 shows a modification of the needle roller bearing 51. In the split outer ring 52 of the needle roller bearing 51, the outer peripheral surfaces at both ends of the lower divided body 52b are directed toward the end. Thus, a tapered surface 53 that is gradually inclined inward in the radial direction is formed. The length of the tapered surface 53 in the circumferential direction is such that the holding recess 28b when the both end surfaces of the lower divided body 52b are arranged horizontally so as to leave the engagement allowance a with the holding recess 27b of the upper housing 25. It is set to be shorter than the protruding amount b from. Note that both ends of the upper divided body 52a are formed flat along the contact surface with the lower divided body 52b.

これにより、下ハウジング２６に対して上ハウジング２５を組み付ける際に、図７に示すように、テーパ面５３によって、下側分割体４１ｂを上ハウジングの保持凹部２７ｂに円滑に入り込ませて案内させることができ、組み付け作業の容易化及び位置決めの円滑化を図ることができる。また、下側分割体５２ｂの両端部分における係り代ａによって、上ハウジング２５が下ハウジング２６に対して確実に位置決めすることができる。   Thus, when the upper housing 25 is assembled to the lower housing 26, as shown in FIG. 7, the lower divided body 41b is smoothly introduced into the holding recess 27b of the upper housing and guided by the tapered surface 53. Thus, the assembling work can be facilitated and the positioning can be facilitated. Further, the upper housing 25 can be reliably positioned with respect to the lower housing 26 by the engagement allowance a at both end portions of the lower divided body 52b.

なお、本発明は、上記実施形態のものに限定されるものでなく、適宜、変形、改良等が可能である。
例えば、クランクシャフトの全てのジャーナル部が、図５や図７に示すような分割型の外輪を備える針状ころ軸受によって構成されてもよく、この場合にも、分割型の外輪によって上ハウジング２５及び下ハウジング２６が位置ずれなく組み付けられる。 In addition, this invention is not limited to the thing of the said embodiment, A deformation | transformation, improvement, etc. are possible suitably.
For example, all the journal portions of the crankshaft may be constituted by needle roller bearings having a split outer ring as shown in FIGS. 5 and 7, and in this case as well, the upper housing 25 is divided by the split outer ring. And the lower housing 26 is assembled without displacement.

本発明の第１実施形態に係るクランクシャフトを示す側面図である。It is a side view showing a crankshaft concerning a 1st embodiment of the present invention. 両端側のジャーナル部に配置された針状ころ軸受を示す断面図である。It is sectional drawing which shows the needle roller bearing arrange | positioned at the journal part of the both ends side. 中間部分のジャーナル部に配置された針状ころ軸受を示す断面図である。It is sectional drawing which shows the needle roller bearing arrange | positioned at the journal part of the intermediate part. 図２の針状ころ軸受をハウジングに組み付ける過程を示す模式図である。It is a schematic diagram which shows the process in which the needle roller bearing of FIG. 2 is assembled | attached to a housing. 本発明の第２実施形態に係る中間部分のジャーナル部に配置された針状ころ軸受を示す断面図である。It is sectional drawing which shows the needle roller bearing arrange | positioned at the journal part of the intermediate part which concerns on 2nd Embodiment of this invention. 図５の針状ころ軸受をハウジングに組み付ける過程を示す模式図である。It is a schematic diagram which shows the process in which the needle roller bearing of FIG. 5 is assembled | attached to a housing. 本発明の第２実施形態の変形例に係る針状ころ軸受の組み付け状態を示す断面図である。It is sectional drawing which shows the assembly | attachment state of the needle roller bearing which concerns on the modification of 2nd Embodiment of this invention. 図７の針状ころ軸受の下側分割体の端部における組み付け状態を示す拡大図である。It is an enlarged view which shows the assembly | attachment state in the edge part of the lower side division body of the needle roller bearing of FIG. （ａ）は、分割型の外輪を有する軸受を示す断面図であり、（ｂ）は、外輪の連結箇所における拡大図である。(A) is sectional drawing which shows the bearing which has a split type outer ring | wheel, (b) is an enlarged view in the connection location of an outer ring | wheel.

符号の説明Explanation of symbols

１１ クランクシャフト
１２ａ，１２ｂ ジャーナル部
１６ ハウジング
２１，２２，５１ 針状ころ軸受（軸受）
３１，４１，５２ 外輪
４１ａ，５２ａ 上側分割体（分割体）
４１ｂ，５２ｂ 下側分割体（分割体）
５３ テーパ面 11 Crankshafts 12a, 12b Journal part 16 Housing 21, 22, 51 Needle roller bearing (bearing)
31, 41, 52 Outer ring 41a, 52a Upper divided body (divided body)
41b, 52b Lower divided body (divided body)
53 Tapered surface

Claims (4)

軸方向に間隔をあけて複数のジャーナル部が設けられたクランクシャフトを、前記ジャーナル部に設けられた複数の軸受によってクランクケースのハウジング内で回転可能に支持するクランクシャフトの支持構造であって、
前記クランクシャフトの両端側に位置する前記ジャーナル部は、単一部材からなる一体型の外輪を備えた前記軸受によって支持され、残りの前記ジャーナル部は、分割型の外輪を備える前記軸受によって支持されることを特徴とするクランクシャフトの支持構造。 A crankshaft support structure for supporting a crankshaft provided with a plurality of journal portions at intervals in the axial direction so as to be rotatable in a housing of the crankcase by a plurality of bearings provided in the journal portions,
The journal portions located at both ends of the crankshaft are supported by the bearing having an integral outer ring made of a single member, and the remaining journal portions are supported by the bearing having a split outer ring. A support structure for a crankshaft. 前記分割型の外輪は、非対称に２分割されていることを特徴とする請求項１に記載のクランクシャフトの支持構造。   The crankshaft support structure according to claim 1, wherein the split outer ring is asymmetrically divided into two. 前記分割型の外輪を構成する周方向寸法が長い一方の分割体は、その両端における外周面に、端部へ向かって次第に径方向内方へ傾斜するテーパ面を有することを特徴とする請求項２に記載のクランクシャフトの支持構造。   The one divided body having a long circumferential dimension that constitutes the split outer ring has a tapered surface that is gradually inclined radially inward toward an end portion on an outer peripheral surface at both ends thereof. 3. The crankshaft support structure according to 2. 請求項１に記載のクランクシャフトの支持構造に使用されることを特徴とするクランクシャフト用軸受。   A crankshaft bearing used in the crankshaft support structure according to claim 1.
JP2007178559A 2007-07-06 2007-07-06 Crankshaft support structure and crankshaft bearing Active JP5012265B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010255695A (en) * 2009-04-22 2010-11-11 Ntn Corp Divided bearing ring and method of manufacturing the same

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JPS6353913U (en) * 1986-09-29 1988-04-11
JPH07113414A (en) * 1993-10-18 1995-05-02 Toyota Motor Corp Connecting rod for internal combustion engine
JP2001271708A (en) * 2000-03-28 2001-10-05 Kubota Corp Tunnel type bearing device of crankshaft
JP2003214442A (en) * 2002-01-18 2003-07-30 Yamaha Motor Co Ltd Rolling bearing and bearing for crankshaft
JP2006200673A (en) * 2005-01-21 2006-08-03 Jtekt Corp Bearing ring for radial roller bearing, radial roller bearing and rotation support device
JP2007085512A (en) * 2005-09-26 2007-04-05 Ntn Corp Rolling bearing for supporting crankshaft

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5563009A (en) * 1978-11-02 1980-05-12 Ntn Toyo Bearing Co Ltd Divided bearing
JPS5943715U (en) * 1982-09-16 1984-03-22 本田技研工業株式会社 Crankshaft support structure in internal combustion engines
JPS6353913U (en) * 1986-09-29 1988-04-11
JPH07113414A (en) * 1993-10-18 1995-05-02 Toyota Motor Corp Connecting rod for internal combustion engine
JP2001271708A (en) * 2000-03-28 2001-10-05 Kubota Corp Tunnel type bearing device of crankshaft
JP2003214442A (en) * 2002-01-18 2003-07-30 Yamaha Motor Co Ltd Rolling bearing and bearing for crankshaft
JP2006200673A (en) * 2005-01-21 2006-08-03 Jtekt Corp Bearing ring for radial roller bearing, radial roller bearing and rotation support device
JP2007085512A (en) * 2005-09-26 2007-04-05 Ntn Corp Rolling bearing for supporting crankshaft

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010255695A (en) * 2009-04-22 2010-11-11 Ntn Corp Divided bearing ring and method of manufacturing the same

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