JP2009275647A - Bearing structure - Google Patents

Bearing structure Download PDF

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JP2009275647A
JP2009275647A JP2008129224A JP2008129224A JP2009275647A JP 2009275647 A JP2009275647 A JP 2009275647A JP 2008129224 A JP2008129224 A JP 2008129224A JP 2008129224 A JP2008129224 A JP 2008129224A JP 2009275647 A JP2009275647 A JP 2009275647A
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lubricating oil
hole
bearing structure
gear
reduction gear
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JP5123733B2 (en
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Masayuki Yamamoto
昌幸 山本
Akihito Kasai
聡人 笠井
Takao Nishida
隆夫 西田
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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  • Rolling Contact Bearings (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bearing structure capable of stably supplying lubricating oil by a simple structure. <P>SOLUTION: The bearing structure is configured so that a reduction gear 50 for decelerating an output of an engine through a reduction gear mechanism 53 is disposed on the side of a crankcase in which lubricating oil 57 lubricating an engine is stored and supports a front shaft 62f of a second gear body 62a forming the reduction gear mechanism 53. By this configuration, a side wall 28 of the crank chamber 29 provided in the crankcase is formed with a front upper hole 28d for supporting the front shaft 62f and a lubricating oil feed hole 28g for making the front upper hole portion 28d communicate with the crank chamber 29 to feed lubricating oil 57 to the front upper hole 28d. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

本発明は、軸受構造の改良に関するものである。   The present invention relates to an improved bearing structure.

従来の軸受構造として、クランクケースのクランク室の側方にギヤ室が設けられ、このギヤ室内に設けられた歯車の軸を支持するための軸受構造が知られている（例えば、特許文献１参照。）。
実開昭５８−１０６５１１号公報 As a conventional bearing structure, a gear chamber is provided on the side of a crank chamber of a crankcase, and a bearing structure for supporting a shaft of a gear provided in the gear chamber is known (for example, see Patent Document 1). .)
Japanese Utility Model Publication No. 58-106511

特許文献１の第５図によれば、クランクケース２の側方に中間蓋３１を介してサイドカバー３８が取付けられることで、中間蓋３１とサイドカバー３８との間にギヤ室Ａが形成され、中間蓋３１とサイドカバー３８とを貫通するようにクランク軸１６が配置され、中間蓋３１を貫通するようにカム軸１７が配置され、クランク軸１６が、中間蓋３１に設けられた軸受８，２１と、サイドカバー３８に設けられた軸受２２とで支持され、カム軸１７が、中間蓋３１に設けられた軸受１０に支持され、クランク軸１６に大歯車２０、カム軸１７に大歯車２０に噛み合う小歯車４０がそれぞれ取付けられ、これらの大歯車２０及び小歯車４０がギヤ室Ａ内に配置されている。   According to FIG. 5 of Patent Document 1, a gear chamber A is formed between the intermediate cover 31 and the side cover 38 by attaching the side cover 38 to the side of the crankcase 2 via the intermediate cover 31. The crankshaft 16 is disposed so as to penetrate the intermediate lid 31 and the side cover 38, the camshaft 17 is disposed so as to penetrate the intermediate lid 31, and the crankshaft 16 is provided in the bearing 8 provided in the intermediate lid 31. , 21 and the bearing 22 provided on the side cover 38, the camshaft 17 is supported by the bearing 10 provided on the intermediate lid 31, the large gear 20 on the crankshaft 16, and the large gear on the camshaft 17. The small gears 40 that mesh with the gears 20 are respectively attached, and the large gears 20 and the small gears 40 are disposed in the gear chamber A.

クランク軸１６及びカム軸１７は、例えば、中間蓋３１には軸受８，２１及び軸受１０を介して支持されているが、半径方向に作用するラジアル荷重が小さい軸であれば、高価な軸受を使用せずに、中間蓋３１に設けられた穴で直接に軸を支持する簡単な軸受構造を採用することも可能である。   For example, the crankshaft 16 and the camshaft 17 are supported by the intermediate lid 31 via the bearings 8 and 21 and the bearing 10, but expensive bearings may be used as long as the radial load acting in the radial direction is small. A simple bearing structure in which the shaft is directly supported by the hole provided in the intermediate lid 31 without using it may be employed.

しかし、穴で直接に軸を支持する軸受構造では、潤滑油の供給が不可欠であり、例えば、エンジンが運転中に傾くような場合には、潤滑油の油面位置が変化して、ギヤ室Ａ内、クランク室Ｂ内に溜められた潤滑油を上記の軸受構造に供給するのが困難になることがあり、耐久性の低下を招く。
本発明の目的は、簡単な構造で潤滑油の供給が安定して行われる軸受構造を提供することにある。 However, in the bearing structure that directly supports the shaft with the hole, it is indispensable to supply the lubricating oil. For example, when the engine is tilted during operation, the oil surface position of the lubricating oil changes, and the gear chamber It may be difficult to supply the lubricating oil stored in A and crank chamber B to the bearing structure, resulting in a decrease in durability.
An object of the present invention is to provide a bearing structure in which lubricating oil is stably supplied with a simple structure.

請求項１に係る発明は、エンジン内を潤滑する潤滑油が溜められたクランクケースの側方に、エンジンの出力を減速機構を介して減速する減速装置が配置され、減速機構を構成する減速ギヤの減速ギヤ軸を支持する軸受構造において、クランクケース内に設けられたクランク室の側壁に、減速ギヤ軸を支持する支持穴と、この支持穴をクランク室に連通させて支持穴に潤滑油を供給する潤滑油供給孔とが設けられることを特徴とする。   According to the first aspect of the present invention, a reduction gear that reduces the output of the engine via a reduction mechanism is disposed on a side of a crankcase in which lubricating oil for lubricating the inside of the engine is stored, and constitutes a reduction gear. In the bearing structure for supporting the reduction gear shaft, a support hole for supporting the reduction gear shaft is formed in the side wall of the crank chamber provided in the crankcase, and lubricating oil is supplied to the support hole by communicating the support hole with the crank chamber. Lubricating oil supply holes to be supplied are provided.

クランクケース内に溜められた潤滑油は、クランク室の側壁に設けられた潤滑油供給孔から側壁の支持穴に供給され、支持穴が潤滑される。
従って、エンジンが傾いた場合でも、エンジン運転中にクランク室内で掻き上げられた潤滑油が常に支持穴に供給され、潤滑油供給が安定する。
減速ギヤ軸は支持穴で支持され、特別に軸受を必要としないから、構造が簡単になり、部品数の増加が抑えられる。 Lubricating oil stored in the crankcase is supplied from a lubricating oil supply hole provided in the side wall of the crank chamber to a supporting hole in the side wall, and the supporting hole is lubricated.
Therefore, even when the engine is tilted, the lubricating oil scraped up in the crank chamber during engine operation is always supplied to the support hole, and the lubricating oil supply is stabilized.
Since the reduction gear shaft is supported by a support hole and does not require a special bearing, the structure is simplified and an increase in the number of parts is suppressed.

請求項２に係る発明は、潤滑油供給孔の下方に潤滑油が溜められる潤滑油溜りが設けられていることを特徴とする。
エンジン運転中にクランク室内で掻き上げられた潤滑油は、潤滑油溜りに溜まり、この潤滑油溜りから支持穴に継続的に供給されて支持穴を潤滑する。 The invention according to claim 2 is characterized in that a lubricating oil reservoir in which lubricating oil is stored is provided below the lubricating oil supply hole.
Lubricating oil scooped up in the crank chamber during engine operation accumulates in the lubricating oil reservoir, and is continuously supplied from the lubricating oil reservoir to the supporting hole to lubricate the supporting hole.

請求項３に係る発明は、支持穴が、減速ギヤ軸を臨む位置に潤滑油溜りと連通する潤滑油供給溝を備えることを特徴とする。
潤滑油溜りに溜まった潤滑油は、潤滑油溜りから減速ギヤ軸を臨む位置に備える潤滑油供給溝に流れ、支持穴の潤滑を促進する。 The invention according to claim 3 is characterized in that the support hole includes a lubricating oil supply groove communicating with the lubricating oil reservoir at a position facing the reduction gear shaft.
The lubricating oil accumulated in the lubricating oil reservoir flows into the lubricating oil supply groove provided at a position facing the reduction gear shaft from the lubricating oil reservoir, and promotes lubrication of the support holes.

請求項１に係る発明では、クランクケース内に設けられたクランク室の側壁に、減速ギヤ軸を支持する支持穴と、この支持穴をクランク室に連通させて支持穴に潤滑油を供給する潤滑油供給孔とが設けられるので、エンジン運転中にエンジンが傾いた状態でも、クランク室から潤滑油供給孔を通じて、減速ギヤ軸の支持穴に常に安定して潤滑油を供給することができる。
また、特別に高価な軸受を設ける必要がなく、軸受構造を簡単にすることができ、部品数の増加を抑えてコストを低減することができる。 According to the first aspect of the present invention, there is provided a support hole for supporting the reduction gear shaft in the side wall of the crank chamber provided in the crankcase, and lubrication for supplying lubricating oil to the support hole by communicating the support hole with the crank chamber. Since the oil supply hole is provided, even when the engine is tilted during operation of the engine, the lubricant can always be stably supplied from the crank chamber to the support hole of the reduction gear shaft through the lubricant oil supply hole.
Further, it is not necessary to provide a particularly expensive bearing, the bearing structure can be simplified, and the cost can be reduced by suppressing an increase in the number of parts.

請求項２に係る発明では、潤滑油供給孔の下方に潤滑油が溜められる潤滑油溜りが設けられているので、潤滑油溜りを設けることで、潤滑油溜りから支持穴へ潤滑油を継続的に供給することができ、エンジンの傾斜状態に関係なく潤滑油を支持穴に確実に供給することができる。
また、エンジン始動時にも、エンジン停止時に潤滑油溜りに溜まっていた潤滑油を支持穴に供給することができ、潤滑油構造の信頼性を向上させることができる。 In the invention according to claim 2, since the lubricating oil reservoir in which the lubricating oil is stored is provided below the lubricating oil supply hole, the lubricating oil is continuously provided from the lubricating oil reservoir to the support hole by providing the lubricating oil reservoir. The lubricating oil can be reliably supplied to the support hole regardless of the inclination state of the engine.
In addition, even when the engine is started, the lubricating oil that has accumulated in the lubricating oil reservoir when the engine is stopped can be supplied to the support hole, and the reliability of the lubricating oil structure can be improved.

請求項３に係る発明では、支持穴が、減速ギヤ軸を臨む位置に潤滑油溜りと連通する潤滑油供給溝を備えるので、潤滑油溜りから潤滑油供給溝に流れた潤滑油を支持穴へ確実に供給することができ、軸受構造の信頼性をより一層向上させることができる。   In the invention according to claim 3, since the support hole includes a lubricating oil supply groove communicating with the lubricating oil reservoir at a position facing the reduction gear shaft, the lubricating oil flowing from the lubricating oil reservoir to the lubricating oil supply groove is supplied to the supporting hole. It can be reliably supplied, and the reliability of the bearing structure can be further improved.

本発明を実施するための最良の形態を添付図に基づいて以下に説明する。なお、図面は符号の向きに見るものとする。
図１は本発明に係る軸受構造を備えたパワーユニットの断面図であり、パワーユニットの一部を構成するエンジン１０は、クランクケース１１と、このクランクケース１１の上部に取付けられたシリンダブロック１２と、このシリンダブロック１２に形成されたシリンダ穴１２ａに移動自在に挿入されたピストン１３と、このピストン１３にピストンピン１４を介して連結されたコネクティングロッド１６と、このコネクティングロッド１６に連結されるとともにクランクケース１１とシリンダブロック１２との合わせ部にベアリング１７，１８を介して回転自在に取付けられたクランクシャフト２１と、シリンダブロック１２にヘッドガスケットを介して取付けられたシリンダヘッド２３と、このシリンダヘッド２３の上部開口部を塞ぐヘッドカバー２４とからなり、クランクケース１１の側方に一体的に減速装置５０が設けられている。 The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.
FIG. 1 is a cross-sectional view of a power unit having a bearing structure according to the present invention. An engine 10 constituting a part of the power unit includes a crankcase 11 and a cylinder block 12 attached to the top of the crankcase 11. A piston 13 movably inserted into a cylinder hole 12a formed in the cylinder block 12, a connecting rod 16 connected to the piston 13 via a piston pin 14, and a crank connected to the connecting rod 16 and a crank. A crankshaft 21 rotatably attached to a mating portion of the case 11 and the cylinder block 12 via bearings 17 and 18, a cylinder head 23 attached to the cylinder block 12 via a head gasket, and the cylinder head 23 Block the top opening of the Consists compartment cover 24., integrally reduction gear 50 is provided on the side of the crankcase 11.

上記エンジン１０及び減速装置５０は、パワーユニット７０を構成するものであり、このパワーユニット７０は、例えば、河川、湖、沼、海上等を移動するボードに搭載される。図中の矢印（ＦＲＯＮＴ）はパワーユニット７０の前方（即ち、ボートの前方）を示している（以下同じ。）。   The engine 10 and the speed reducer 50 constitute a power unit 70. The power unit 70 is mounted on a board that moves in, for example, a river, a lake, a swamp, the sea, and the like. The arrow (FRONT) in the figure indicates the front of the power unit 70 (that is, the front of the boat) (the same applies hereinafter).

クランクケース１１は、クランクケース本体２６と、このクランクケース本体２６の側部に複数のボルト２７で取付けられた側壁２８とからなり、これらのクランクケース本体２６、側壁２８、シリンダブロック１２、ピストン１３で囲まれた密閉されたクランク室２９が形成され、側壁２８にベアリング１８が取付けられ、クランクケース本体２６と側壁２８とにカムシャフト３１が回転自在に支持されている。   The crankcase 11 includes a crankcase body 26 and a side wall 28 attached to the side portion of the crankcase body 26 with a plurality of bolts 27. The crankcase body 26, the side wall 28, the cylinder block 12, and the piston 13 are provided. A sealed crank chamber 29 surrounded by a circle is formed, the bearing 18 is attached to the side wall 28, and the camshaft 31 is rotatably supported by the crankcase body 26 and the side wall 28.

カムシャフト３１は、カムギヤ３１ａ、吸気用カム３１ｂ及び排気用カム３１ｃが設けられる。
カムギヤ３１ａは、クランクシャフト２１に設けられたカムシャフト駆動ギヤ３３に噛み合うことで、カムシャフト３１がクランクシャフト２１に駆動され、吸気用カム３１ｂ及び排気用カム３１ｃの回転が図示せぬプッシュロッドの往復動に変換され、シリンダヘッド２３に設けられた動弁機構３４を構成する吸気バルブ３６及び排気バルブ３７が開閉される。 The camshaft 31 is provided with a cam gear 31a, an intake cam 31b, and an exhaust cam 31c.
The cam gear 31a meshes with a camshaft drive gear 33 provided on the crankshaft 21, whereby the camshaft 31 is driven by the crankshaft 21, and the rotation of the intake cam 31b and the exhaust cam 31c is not shown in the push rod. The intake valve 36 and the exhaust valve 37 constituting the valve mechanism 34 provided in the cylinder head 23 are opened and closed after being converted into reciprocating motion.

減速装置５０は、エンジン１０の側壁２８に取付けられたサイドカバー５１と、このサイドカバー５１及び側壁２８で囲まれたギヤ室５２内に配置された減速機構５３と、ベアリング５４と、オイルシール５６とからなる。
クランク室２９及びギヤ室５２内には、パワーユニット７０の各部を潤滑する潤滑油５７が溜められている。なお、５７ａは潤滑油５７の油面である The speed reducer 50 includes a side cover 51 attached to the side wall 28 of the engine 10, a speed reduction mechanism 53 disposed in a gear chamber 52 surrounded by the side cover 51 and the side wall 28, a bearing 54, and an oil seal 56. It consists of.
In the crank chamber 29 and the gear chamber 52, lubricating oil 57 for lubricating each part of the power unit 70 is stored. In addition, 57a is the oil surface of the lubricating oil 57.

潤滑油５７内には、上記したカムギヤ３１ａが浸されているため、カムギヤ３１ａが回転すれば、溜められている潤滑油５７はクランク室２９内に掻き上げられ、各部を潤滑する。   Since the cam gear 31a described above is immersed in the lubricating oil 57, when the cam gear 31a rotates, the accumulated lubricating oil 57 is scraped up into the crank chamber 29 and lubricates each part.

図２は本発明に係る軸受構造を示す断面図であり、減速装置５０の減速機構５３は、クランクシャフト２１の端部２１ａにボルト５９で取付けられた第１ギヤ６１と、この第１ギヤ６１に噛み合うように側壁２８及びサイドカバー５１のそれぞれに回転自在に支持された第２ギヤ６２と、この第２ギヤ６２に噛み合うように側壁２８及びサイドカバー５１のそれぞれに回転自在に支持された第３ギヤ６３とからなる。なお、６５はワッシャ、６６はシムである。   FIG. 2 is a cross-sectional view showing a bearing structure according to the present invention. The speed reduction mechanism 53 of the speed reduction device 50 includes a first gear 61 attached to the end 21 a of the crankshaft 21 with a bolt 59, and the first gear 61. A second gear 62 rotatably supported on each of the side wall 28 and the side cover 51 so as to mesh with the second gear 62, and a second gear 62 rotatably supported on each of the side wall 28 and the side cover 51 so as to mesh with the second gear 62. 3 gears 63. In addition, 65 is a washer and 66 is a shim.

第２ギヤ６２は、第２ギヤ本体６２ａと、この第２ギヤ本体６２ａに一体に形成された第２ギヤ軸６２ｂとからなり、第２ギヤ軸６２ｂは、側壁２８に設けられた前上部軸受部２８ａに支持される前軸部６２ｆと、サイドカバー５１に設けられた後上部軸受部５１ａに支持される後軸部６２ｒとからなる。   The second gear 62 includes a second gear main body 62a and a second gear shaft 62b formed integrally with the second gear main body 62a. The second gear shaft 62b is a front upper bearing provided on the side wall 28. The front shaft portion 62f is supported by the portion 28a, and the rear shaft portion 62r is supported by the rear upper bearing portion 51a provided on the side cover 51.

第３ギヤ６３は、第３ギヤ本体６３ａと、この第３ギヤ本体６３ａに一体に形成された第３ギヤ軸６３ｂとからなり、第３ギヤ軸６３ｂは、側壁２８に設けられた前下部軸受部２８ｂに支持される前軸部６３ｆと、サイドカバー５１に設けられたベアリング５４に支持される後軸部６３ｒとからなる。
後軸部６３ｒは、ボートを推進させるプロペラが中間軸を介して連結される部分である。 The third gear 63 includes a third gear main body 63 a and a third gear shaft 63 b formed integrally with the third gear main body 63 a. The third gear shaft 63 b is a front lower bearing provided on the side wall 28. The front shaft portion 63 f is supported by the portion 28 b and the rear shaft portion 63 r is supported by the bearing 54 provided on the side cover 51.
The rear shaft portion 63r is a portion to which a propeller that propels the boat is connected via an intermediate shaft.

前上部軸受部２８ａは、前軸部６２ｆが挿入される前上部穴部２８ｄと、この前上部穴部２８ｄの内周面下部に、前軸部６２ｆの軸方向に延びるように且つ前軸部６２ｆを臨む位置に形成された潤滑油供給溝２８ｅと、この潤滑油供給溝２８ｅに連通するように前上部穴部２８ｄの軸方向前側に設けられてクランク室２９内に掻き上げられた潤滑油５７を溜める潤滑油溜り２８ｆと、この潤滑油溜り２８ｆ及びクランク室２９のそれぞれを連通するように側壁２８に開けられた潤滑油供給孔２８ｇとからなる。   The front upper bearing portion 28a includes a front upper hole portion 28d into which the front shaft portion 62f is inserted and a lower portion of the inner peripheral surface of the front upper hole portion 28d so as to extend in the axial direction of the front shaft portion 62f. Lubricating oil supply groove 28e formed at a position facing 62f, and the lubricating oil provided in the axially front side of the front upper hole 28d so as to communicate with the lubricating oil supply groove 28e and scraped into the crank chamber 29 A lubricating oil reservoir 28f for storing 57, and a lubricating oil supply hole 28g formed in the side wall 28 so as to communicate with each of the lubricating oil reservoir 28f and the crank chamber 29.

後上部軸受部５１ａは、後軸部６２ｒが挿入される後上部穴部５１ｄと、この後上部穴部５１ｄの内周面下部に後軸部６２ｒの軸方向に延びるように且つ後軸部６２ｒを臨む位置に形成された潤滑油供給溝５１ｅと、この潤滑油供給溝５１ｅに連通するように後上部穴部５１ｄの軸方向後側に設けられてギヤ室５２内に掻き上げられた潤滑油５７を溜める潤滑油溜り５１ｆとからなる。   The rear upper bearing portion 51a includes a rear upper hole portion 51d into which the rear shaft portion 62r is inserted, and a rear shaft portion 62r extending in the axial direction of the rear shaft portion 62r at the lower portion of the inner peripheral surface of the rear upper hole portion 51d. The lubricating oil supply groove 51e formed at a position facing the lubricating oil and the lubricating oil that is provided in the axially rear side of the rear upper hole 51d so as to communicate with the lubricating oil supply groove 51e and is scraped up into the gear chamber 52 And a lubricating oil reservoir 51f that accumulates 57.

前下部軸受部２８ｂは、前軸部６３ｆが挿入される前下部穴部２８ｊと、この前下部穴部２８ｊの内周面上部に前軸部６３ｆの軸方向に延びるように形成された潤滑油供給溝２８ｋと、前下部穴部２８ｊ及びクランク室２９のそれぞれを連通するように側壁２８に開けられた潤滑油供給孔２８ｎとからなる。   The front lower bearing portion 28b includes a front lower hole portion 28j into which the front shaft portion 63f is inserted, and a lubricating oil formed on the inner peripheral surface of the front lower hole portion 28j so as to extend in the axial direction of the front shaft portion 63f. It comprises a supply groove 28k and a lubricating oil supply hole 28n formed in the side wall 28 so as to communicate with each of the front lower hole portion 28j and the crank chamber 29.

以上に述べた前上部軸受部２８ａ、前下部軸受部２８ｂ及び後上部軸受部５１ａの軸受構造の作用を次に説明する。
図３は本発明に係る軸受構造の作用を示す作用図である。
例えば、ボートが前進するときには、船体が前上がりの姿勢になるため、これに伴ってパワーユニット１０、詳しくは減速装置５０は図に示すように鉛直線８０に対して白抜き矢印で示すように傾く。 Next, the operation of the bearing structure of the front upper bearing portion 28a, the front lower bearing portion 28b, and the rear upper bearing portion 51a described above will be described.
FIG. 3 is an operation diagram showing the operation of the bearing structure according to the present invention.
For example, when the boat moves forward, the hull is in a front-up position, and accordingly, the power unit 10, specifically, the speed reducer 50 is tilted with respect to the vertical line 80 as shown by a white arrow as shown in the figure. .

このとき、パワーユニット１０内の潤滑油５７の油面５７ａは、図２に示されたエンジン停止中の油面５７ａに対して傾くとともに下がった位置になり、前上部軸受部２８ａからはより離れた位置となる。   At this time, the oil level 57a of the lubricating oil 57 in the power unit 10 is inclined and lowered with respect to the oil level 57a when the engine is stopped as shown in FIG. 2, and is further away from the front upper bearing portion 28a. Position.

この状態で、前上部軸受部２８ａにおいては、クランク室２９内に掻き上げられた潤滑油５７が、矢印で示すように潤滑油供給孔２８ｇから潤滑油溜り２８ｆに入り込んで溜まる。これにより、潤滑油５７は、潤滑油溜り２８ｆから潤滑油供給溝２８ｅを通って前上部穴部２８ｄと前軸部６２ｆとの隙間に供給され、潤滑する。   In this state, in the front upper bearing portion 28a, the lubricating oil 57 scraped up into the crank chamber 29 enters the lubricating oil reservoir 28f from the lubricating oil supply hole 28g and accumulates as indicated by the arrow. Thus, the lubricating oil 57 is supplied from the lubricating oil reservoir 28f through the lubricating oil supply groove 28e to the gap between the front upper hole portion 28d and the front shaft portion 62f and is lubricated.

また、前下部軸受部２８ｂにおいては、潤滑油供給孔２８ｍがクランク室２９に溜まっている潤滑油５７に浸っているため、潤滑油５７は、潤滑油供給孔２８ｎから前下部穴部２８ｊと前軸部６３ｆとの隙間にスムーズに供給される。   Further, in the front lower bearing portion 28b, since the lubricating oil supply hole 28m is immersed in the lubricating oil 57 accumulated in the crank chamber 29, the lubricating oil 57 passes from the lubricating oil supply hole 28n to the front lower hole portion 28j. It is smoothly supplied to the gap with the shaft portion 63f.

更に、後上部軸受部５１ａにおいては、潤滑油溜り５１ｆ及び潤滑油供給溝５１ｅに潤滑油５７が溜まりやすくなり、その潤滑油５７で、後上部穴部５１ｄと後軸部６２ｒとの隙間が潤滑される。   Further, in the rear upper bearing portion 51a, the lubricating oil 57 is easily accumulated in the lubricating oil reservoir 51f and the lubricating oil supply groove 51e, and the lubricating oil 57 lubricates the gap between the rear upper hole portion 51d and the rear shaft portion 62r. Is done.

以上の図２、図３に示されるように、エンジン１０（図１参照）内を潤滑する潤滑油５７が溜められたクランクケース１１（図１参照）の側方に、エンジン１０の出力を減速機構５３を介して減速する減速装置５０が配置され、減速機構５３を構成する減速ギヤとしての第２ギヤ本体６２ａの減速ギヤ軸としての第２ギヤ軸６２ｂを支持する軸受構造において、クランクケース１１内に設けられたクランク室２９の側壁２８に、第２ギヤ軸６２ｂ、詳しくは、前軸部６２ｆを支持する支持穴としての前上部穴部２８ｄと、この前上部穴部２８ｄをクランク室２９に連通させて前上部穴部２８ｄに潤滑油５７を供給する潤滑油供給孔２８ｇとが設けられるので、エンジン運転中にエンジン１０が傾いた状態でも、クランク室２９から潤滑油供給孔２８ｇを通じて、前軸部６２ｆの支持穴である前上部穴部２８ｄに常に安定して潤滑油を供給することができる。
また、特別に高価な軸受を設ける必要がなく、軸受構造を簡単にすることができ、部品数の増加を抑えてコストを低減することができる。 As shown in FIGS. 2 and 3, the output of the engine 10 is decelerated to the side of the crankcase 11 (see FIG. 1) in which the lubricating oil 57 that lubricates the engine 10 (see FIG. 1) is stored. In a bearing structure in which a speed reduction device 50 that decelerates via a mechanism 53 is disposed and supports a second gear shaft 62b as a speed reduction gear shaft of a second gear body 62a as a speed reduction gear constituting the speed reduction mechanism 53, the crankcase 11 The crank chamber 29 is provided with a front upper hole 28d as a support hole for supporting the second gear shaft 62b, specifically, the front shaft 62f, and the front upper hole 28d on the side wall 28 of the crank chamber 29 provided in the crank chamber 29. The lubricating oil supply hole 28g for supplying the lubricating oil 57 to the front upper hole portion 28d is provided so that the lubricating oil is supplied from the crank chamber 29 even when the engine 10 is tilted during engine operation. Through 28 g, it is always possible to supply a stable lubricating oil to the upper hole 28d before a supporting hole of the front shaft portion 62f.
Further, it is not necessary to provide a particularly expensive bearing, the bearing structure can be simplified, and the cost can be reduced by suppressing an increase in the number of parts.

また、潤滑油供給孔２８ｇの下方に潤滑油５７が溜められる潤滑油溜り２８ｆが設けられているので、潤滑油溜り２８ｆを設けることで、潤滑油溜り２８ｆから前上部穴部２８ｄへ潤滑油５７を継続的に供給することができ、エンジン１０の傾斜状態に関係なく潤滑油５７を前上部穴部２８ｄに確実に供給することができる。   Since the lubricating oil reservoir 28f in which the lubricating oil 57 is stored is provided below the lubricating oil supply hole 28g, the lubricating oil 57 is provided from the lubricating oil reservoir 28f to the front upper hole portion 28d by providing the lubricating oil reservoir 28f. The lubricating oil 57 can be reliably supplied to the front upper hole 28d regardless of the inclination state of the engine 10.

また、エンジン始動時にも、エンジン停止時に潤滑油溜り２８ｆに溜まっていた潤滑油５７を前上部穴部２８ｄに供給することができ、潤滑油構造の信頼性を向上させることができる。   Further, even when the engine is started, the lubricating oil 57 accumulated in the lubricating oil reservoir 28f when the engine is stopped can be supplied to the front upper hole 28d, and the reliability of the lubricating oil structure can be improved.

更に、前上部穴部２８ｄが、前軸部６２ｆを臨む位置に潤滑油溜り２８ｆと連通する潤滑油供給溝２８ｅを備えるので、潤滑油溜り２８ｆから潤滑油供給溝２８ｅに流れた潤滑油５７を前上部穴部２８ｄへ確実に供給することができ、軸受構造の信頼性をより一層向上させることができる。   Further, since the front upper hole 28d is provided with a lubricating oil supply groove 28e communicating with the lubricating oil reservoir 28f at a position facing the front shaft portion 62f, the lubricating oil 57 flowing from the lubricating oil reservoir 28f to the lubricating oil supply groove 28e is removed. It can be reliably supplied to the front upper hole 28d, and the reliability of the bearing structure can be further improved.

尚、図２に示された本実施形態において、後上部軸受部５１ａの後上部穴部５１ｄとギヤ室５２と連通させてギヤ室５２内で掻き上げられた潤滑油５７を後上部穴部５１ｄに供給する潤滑油供給孔をサイドカバー５１に形成してもよい。   In the present embodiment shown in FIG. 2, the lubricating oil 57 raked up in the gear chamber 52 in communication with the rear upper hole portion 51d of the rear upper bearing portion 51a and the gear chamber 52 is removed from the rear upper hole portion 51d. Lubricating oil supply holes for supplying to the side cover 51 may be formed in the side cover 51.

本発明の軸受構造は、ボート用パワーユニットに好適である。   The bearing structure of the present invention is suitable for a boat power unit.

本発明に係る軸受構造を備えたパワーユニットの断面図である。It is sectional drawing of the power unit provided with the bearing structure which concerns on this invention. 本発明に係る軸受構造を示す断面図である。It is sectional drawing which shows the bearing structure which concerns on this invention. 本発明に係る軸受構造の作用を示す作用図である。It is an action figure which shows the effect | action of the bearing structure which concerns on this invention.

符号の説明Explanation of symbols

１０…エンジン、１１…クランクケース、２１ａ，６２ｂ，６３ｂ…減速ギヤ軸（クランクシャフトの端部、第２ギヤ軸、第３ギヤ軸）、２８…側壁、２８ｄ…支持部（前上部穴部）、２８ｅ…潤滑油供給溝、２８ｆ…潤滑油溜り、２８ｇ…潤滑油供給孔、２９…クランク室、５０…減速装置、５３…減速機構、５７…潤滑油、６２ａ…減速ギヤ（第２ギヤ本体）、６２ｂ…減速ギヤ軸（第３ギヤ軸）。   DESCRIPTION OF SYMBOLS 10 ... Engine, 11 ... Crankcase, 21a, 62b, 63b ... Reduction gear shaft (end part of a crankshaft, 2nd gear shaft, 3rd gear shaft), 28 ... Side wall, 28d ... Support part (front upper hole part) 28e ... Lubricating oil supply groove, 28f ... Lubricating oil reservoir, 28g ... Lubricating oil supply hole, 29 ... Crank chamber, 50 ... Reduction gear, 53 ... Reduction gear, 57 ... Lubricating oil, 62a ... Reduction gear (second gear body) ), 62b... Reduction gear shaft (third gear shaft).

Claims (3)

エンジン内を潤滑する潤滑油が溜められたクランクケースの側方に、前記エンジンの出力を減速機構を介して減速する減速装置が配置され、前記減速機構を構成する減速ギヤの減速ギヤ軸を支持する軸受構造において、
前記クランクケース内に設けられたクランク室の側壁に、前記減速ギヤ軸を支持する支持穴と、この支持穴を前記クランク室に連通させて支持穴に潤滑油を供給する潤滑油供給孔とが設けられることを特徴とする軸受構造。 A reduction device that reduces the output of the engine via a reduction mechanism is disposed on the side of the crankcase in which lubricating oil for lubricating the inside of the engine is stored, and supports the reduction gear shaft of the reduction gear that constitutes the reduction mechanism. Bearing structure
A support hole for supporting the reduction gear shaft and a lubricant supply hole for supplying the lubricant to the support hole by communicating the support hole with the crank chamber are formed in a side wall of the crank chamber provided in the crankcase. A bearing structure characterized by being provided. 前記潤滑油供給孔の下方に前記潤滑油が溜められる潤滑油溜りが設けられていることを特徴とする請求項１記載の軸受構造。   The bearing structure according to claim 1, wherein a lubricating oil reservoir for storing the lubricating oil is provided below the lubricating oil supply hole. 前記支持穴は、前記減速ギヤ軸を臨む位置に前記潤滑油溜りと連通する潤滑油供給溝を備えることを特徴とする請求項２記載の軸受構造。   The bearing structure according to claim 2, wherein the support hole includes a lubricating oil supply groove that communicates with the lubricating oil reservoir at a position facing the reduction gear shaft.
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