JP2011144701A - Lubricating oil supply device for internal combustion engine - Google Patents

Lubricating oil supply device for internal combustion engine Download PDF

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JP2011144701A
JP2011144701A JP2010003990A JP2010003990A JP2011144701A JP 2011144701 A JP2011144701 A JP 2011144701A JP 2010003990 A JP2010003990 A JP 2010003990A JP 2010003990 A JP2010003990 A JP 2010003990A JP 2011144701 A JP2011144701 A JP 2011144701A
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Prior art keywords
lubricating oil
crankcase
pump
balancer shaft
shaft
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Japanese (ja)
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Tamotsu Momozaki
保 百▲崎▼
Toru Kawai
徹 川合
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Honda Motor Co Ltd
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Honda Motor Co Ltd
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Priority to JP2010003990A priority Critical patent/JP2011144701A/en
Priority to US12/973,742 priority patent/US20110168125A1/en
Priority to CN2010106197602A priority patent/CN102128065B/en
Publication of JP2011144701A publication Critical patent/JP2011144701A/en
Pending legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M1/00—Pressure lubrication
    • F01M1/02—Pressure lubrication using lubricating pumps
    • F01M2001/0253—Pressure lubrication using lubricating pumps characterised by the pump driving means
    • F01M2001/0276—Pressure lubrication using lubricating pumps characterised by the pump driving means driven by a balancer shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F01M2011/026—Arrangements of lubricant conduits for lubricating crankshaft bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01M—LUBRICATING OF MACHINES OR ENGINES IN GENERAL; LUBRICATING INTERNAL COMBUSTION ENGINES; CRANKCASE VENTILATING
    • F01M11/00—Component parts, details or accessories, not provided for in, or of interest apart from, groups F01M1/00 - F01M9/00
    • F01M11/02—Arrangements of lubricant conduits
    • F01M2011/027—Arrangements of lubricant conduits for lubricating connecting rod bearings

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Lubrication Of Internal Combustion Engines (AREA)
  • Cylinder Crankcases Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lubricating oil supply device for an internal combustion engine, including a lubricating oil pump at one end of a balancer shaft while eliminating the need for providing an oil path in the balancer shaft. <P>SOLUTION: A suction oil path 48 for guiding lubricating oil to the lubricating oil pump 25 and a discharge oil path 49 for guiding the lubricating oil compressed by the lubricating oil pump 25 to an in-shaft oil path 53 are provided in the thickness of a crank case 11. Thus, the lubricating oil supply device for the internal combustion engine 10 includes the lubricating oil pump 25 at one end of the balancer shaft 14 while eliminating the need for providing the oil path in the balancer shaft 14. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

本発明は、汎用エンジンに好適な潤滑油供給装置に関する。   The present invention relates to a lubricating oil supply device suitable for a general-purpose engine.

内燃機関では、潤滑油ポンプで加圧した潤滑油を回転部材の摺動部位へ供給し、回転運動の円滑化を図っている。
潤滑油ポンプをオイル溜まり中に配置した内燃機関が提案されている（例えば、特許文献１（図１）参照。）。 In an internal combustion engine, lubricating oil pressurized by a lubricating oil pump is supplied to a sliding portion of a rotating member to facilitate smooth rotation.
An internal combustion engine in which a lubricating oil pump is disposed in an oil reservoir has been proposed (see, for example, Patent Document 1 (FIG. 1)).

特許文献１の図１に示されるように、クランクケース（２）（括弧付き数字は、特許文献１に記載されている符号を示す。以下、同様）の底にオイル溜め（３０）があり、このオイル溜め（３０）に漬かるようにして潤滑油ポンプ（３２）が設けられている。   As shown in FIG. 1 of Patent Document 1, there is an oil sump (30) at the bottom of the crankcase (2) (the numbers in parentheses indicate the symbols described in Patent Document 1. The same applies hereinafter) A lubricating oil pump (32) is provided so as to be immersed in the oil reservoir (30).

クランク軸（１）に駆動ギヤ（３４）が一体形成され、この駆動ギヤ（３４）で従動ギヤ（３５）が駆動され、この従動ギヤ（３５）で潤滑油ポンプ（３２）が駆動される。
エンジンを小型化すると共に部品点数の削減を図ることが求められる場合には、駆動ギヤ（３４）及び従動ギヤ（３５）を省くことが望まれる。
そこで、駆動ギヤ（３４）及び従動ギヤ（３５）を省いた汎用エンジンが提案されている（例えば、特許文献２（図１）参照。）。 A drive gear (34) is formed integrally with the crankshaft (1), the driven gear (35) is driven by the drive gear (34), and the lubricating oil pump (32) is driven by the driven gear (35).
If it is desired to reduce the number of parts while reducing the size of the engine, it is desirable to omit the drive gear (34) and the driven gear (35).
Therefore, a general-purpose engine in which the drive gear (34) and the driven gear (35) are omitted has been proposed (see, for example, Patent Document 2 (FIG. 1)).

特許文献２の技術を図面に基づいて以下に説明する。
図６は従来の技術の基本構成を説明する図であり、クランクケース１０１の側壁１０２に、軸受１０３を介してバランサ軸１０４の一端が支持されている。このバランサ軸１０４の一端にポンプ軸１０５が機械的に連結され、このポンプ軸１０５に潤滑油ポンプ１０６のインナーロータ１０７が結合され、このインナーロータ１０７にアウターロータ１０８が嵌められている。 The technique of patent document 2 is demonstrated below based on drawing.
FIG. 6 is a diagram for explaining the basic configuration of the conventional technique. One end of a balancer shaft 104 is supported on the side wall 102 of the crankcase 101 via a bearing 103. A pump shaft 105 is mechanically connected to one end of the balancer shaft 104, an inner rotor 107 of a lubricating oil pump 106 is coupled to the pump shaft 105, and an outer rotor 108 is fitted to the inner rotor 107.

バランサ軸１０４には、一端から軸中心線に沿って長い油路１０９が設けられている。 潤滑油は、吸入口１１１を通じて潤滑油ポンプ１０６に吸い込まれ、潤滑油ポンプ１０６から吐出される。吐出された潤滑油は、吐出口１１２から油路１０９を通って、エンジンの潤滑対象部へ送られる。   The balancer shaft 104 is provided with a long oil passage 109 from one end along the axial center line. The lubricating oil is sucked into the lubricating oil pump 106 through the suction port 111 and discharged from the lubricating oil pump 106. The discharged lubricating oil passes through the oil passage 109 from the discharge port 112 and is sent to the lubrication target portion of the engine.

バランサ軸１０４の一端に潤滑油ポンプ１０６が連結されたので、特許文献１に示される駆動ギヤ（３４）及び従動ギヤ（３５）が不要となる。
しかし、バランサ軸１０４に長い油路１０９を設ける必要がある。バランサ軸１０４は、クランク軸のアンバランス要素を、打ち消すことができるようなアンバランスな形状の部材であり、且つデリケートな部材である。このようなバランサ軸１０４に長い油路１０９を設けることは、加工費の高騰に加えて、バランサ軸１０４の形状設計が難しくなり、設計費の高騰に繋がる。 Since the lubricating oil pump 106 is connected to one end of the balancer shaft 104, the drive gear (34) and the driven gear (35) disclosed in Patent Document 1 are not necessary.
However, it is necessary to provide a long oil passage 109 on the balancer shaft 104. The balancer shaft 104 is a member having an unbalanced shape that can cancel out an unbalance element of the crankshaft, and is a delicate member. Providing such a long oil passage 109 in the balancer shaft 104 makes it difficult to design the shape of the balancer shaft 104 in addition to an increase in machining cost, leading to an increase in design cost.

そこで、バランサ軸の一端に潤滑油ポンプを備えながら、バランサ軸に油路を設けなくて済むような内燃機関の潤滑油供給装置が望まれる。   Therefore, there is a demand for a lubricating oil supply device for an internal combustion engine that does not require an oil passage in the balancer shaft while having a lubricating oil pump at one end of the balancer shaft.

特開２００７−５１６４９公報JP 2007-51649 A 実開平５−１４５０５号公報Japanese Utility Model Publication No. 5-14505

本発明は、バランサ軸の一端に潤滑油ポンプを備えながら、バランサ軸に油路を設けなくて済むような内燃機関の潤滑油供給装置を提供することを課題とする。   An object of the present invention is to provide a lubricating oil supply device for an internal combustion engine that does not require an oil passage in the balancer shaft while having a lubricating oil pump at one end of the balancer shaft.

請求項１に係る発明は、クランクケースにクランクシャフト及びバランサ軸が収納され、前記クランクシャフトに潤滑油をクランク軸受へ導くシャフト内油路が設けられており、このシャフト内油路へ潤滑油を供給することで前記クランク軸受へ潤滑油を供給する内燃機関の潤滑油供給装置であって、
前記クランクケースに溜まっている潤滑油を吸い込み、加圧する潤滑油ポンプが、前記バランサ軸の一端に連結された形態で配置され、
前記クランクケースに溜まっている潤滑油を前記潤滑油ポンプへ導く吸入油路が、前記クランクケースの肉厚内に設けられると共に、前記潤滑油ポンプで加圧された潤滑油を前記シャフト内油路へ導く吐出油路が、前記クランクケースの肉厚内に設けられていることを特徴とする。 According to the first aspect of the present invention, a crankshaft and a balancer shaft are housed in a crankcase, and an oil passage in the shaft that guides lubricating oil to a crank bearing is provided in the crankshaft, and the lubricating oil is supplied to the oil passage in the shaft. A lubricating oil supply device for an internal combustion engine that supplies lubricating oil to the crank bearing by supplying,
A lubricating oil pump that sucks and pressurizes the lubricating oil accumulated in the crankcase is arranged in a form connected to one end of the balancer shaft,
An intake oil passage for guiding the lubricating oil accumulated in the crankcase to the lubricating oil pump is provided within the wall thickness of the crankcase, and the lubricating oil pressurized by the lubricating oil pump is supplied to the oil passage in the shaft. A discharge oil passage leading to the inside of the crankcase is provided in the wall thickness of the crankcase.

請求項１に係る発明では、クランクケースに溜まっている潤滑油を潤滑油ポンプへ導く吸入油路及び潤滑油ポンプで加圧された潤滑油をシャフト内油路へ導く吐出油路が、クランクケースの肉厚内に設けられている。
結果、バランサ軸の一端に潤滑油ポンプを備えながら、バランサ軸に油路を設けなくて済むような内燃機関の潤滑油供給装置が提供される。 In the invention according to claim 1, the intake oil passage for guiding the lubricating oil accumulated in the crankcase to the lubricating oil pump and the discharge oil passage for guiding the lubricating oil pressurized by the lubricating oil pump to the oil passage in the shaft are provided in the crankcase. Is provided within the wall thickness.
As a result, there is provided a lubricating oil supply device for an internal combustion engine that is provided with a lubricating oil pump at one end of the balancer shaft and that does not require an oil passage in the balancer shaft.

本発明に係る内燃機関の要部断面図である。It is principal part sectional drawing of the internal combustion engine which concerns on this invention. 図１の２−２線断面図である。FIG. 2 is a sectional view taken along line 2-2 of FIG. 図１の３−３線断面図である。FIG. 3 is a sectional view taken along line 3-3 in FIG. 1. 潤滑油ポンプの作用説明図である。It is operation | movement explanatory drawing of a lubricating oil pump. クランクケースの要部断面図である。It is principal part sectional drawing of a crankcase. 従来の技術の基本構成を説明する図である。It is a figure explaining the basic composition of the conventional technology.

本発明の実施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。   Embodiments of the present invention will be described below with reference to the accompanying drawings. The drawings are viewed in the direction of the reference numerals.

本発明の実施例を図面に基づいて説明する。
図１に示されるように、内燃機関１０のクランクケース１１に、クランクシャフト１２とバランサ軸１３とが互いに平行となるようにして設けられている。 Embodiments of the present invention will be described with reference to the drawings.
As shown in FIG. 1, a crankshaft 11 of an internal combustion engine 10 is provided with a crankshaft 12 and a balancer shaft 13 that are parallel to each other.

クランクシャフト１２は、クランクケース１１を閉じるケースリッド１４に設けられている、玉軸受１５と、クランクケース１１に設けられている平軸受１６とで、両端支持されている。玉軸受は、ころがり軸受であればよく、ころ軸受であってもよい。
また、バランサ軸１３はクランクシャフト１２のアンバランス要素を相殺することができるように想像線で示すようなアンバランスな形状とされた回転部品であり、ケースリッド１４に設けられている玉軸受１７と、クランクケース１１に設けられている玉軸受１８とで、両端支持されている。ケースリッド１４はボルト１９を緩めることで、クランクケース１１から外すことができる。 The crankshaft 12 is supported at both ends by a ball bearing 15 provided on a case lid 14 that closes the crankcase 11 and a plain bearing 16 provided on the crankcase 11. The ball bearing may be a rolling bearing and may be a roller bearing.
Further, the balancer shaft 13 is a rotating part having an unbalanced shape as shown by an imaginary line so that an unbalanced element of the crankshaft 12 can be offset, and a ball bearing 17 provided on the case lid 14. And both ends are supported by a ball bearing 18 provided in the crankcase 11. The case lid 14 can be removed from the crankcase 11 by loosening the bolts 19.

クランクシャフト１２には、玉軸受１５の近傍に、大径の第１駆動ギヤ２１と小径の第２駆動ギヤ２２とが一体形成されている。
また、バランサ軸１３に第１従動ギヤ２３が一体形成されており、この第１従動ギヤ２３が第１駆動ギヤ２１により駆動される。 A large-diameter first drive gear 21 and a small-diameter second drive gear 22 are integrally formed on the crankshaft 12 near the ball bearing 15.
A first driven gear 23 is integrally formed with the balancer shaft 13, and the first driven gear 23 is driven by the first drive gear 21.

そして、バランサ軸１３の一端（ケースリッド１４から遠い方の端）に潤滑油ポンプ２５が機械的に連結されている。すなわち、ポンプ軸２６がバランサ軸１３の軸線上に配置されている。潤滑油ポンプ２５の構造及び作用は後述するが、平軸受１６に設けた環状溝２７及びコンロッド２８の大端部が連結されるクランク軸受２９に潤滑油ポンプ２５で潤滑油を強制的に供給させる。   A lubricant pump 25 is mechanically connected to one end of the balancer shaft 13 (the end far from the case lid 14). That is, the pump shaft 26 is disposed on the balancer shaft 13. Although the structure and operation of the lubricating oil pump 25 will be described later, the lubricating oil is forcibly supplied to the crank bearing 29 to which the annular groove 27 provided in the plain bearing 16 and the large end of the connecting rod 28 are connected. .

クランクシャフト１２とクランクケース１１はオイルシール３１でシールされ、クランクシャフト１２とケースリッド１４はオイルシール３２でシールされているため、潤滑油が外へ漏れる心配はない。
クランクシャフト１２の一端にフライホイール３３が取付けられ、バランサ軸１３と共にフライホイール３３によりクランクシャフト１２の円滑回転を図ることができる。 Since the crankshaft 12 and the crankcase 11 are sealed by the oil seal 31, and the crankshaft 12 and the case lid 14 are sealed by the oil seal 32, there is no fear that the lubricating oil leaks outside.
A flywheel 33 is attached to one end of the crankshaft 12, and the crankshaft 12 can be smoothly rotated by the flywheel 33 together with the balancer shaft 13.

次に、内燃機関の全体的な構造を説明する。
図２に示すように、内燃機関１０は、クランクケース１１と、このクランクケース１１から斜め上に延びるシリンダ部３４と、このシリンダ部３４に嵌められたシリンダライナー３５と、このシリンダライナー３５に移動自在に収納されるピストン３６と、このピストン３６から延びるコンロッド２８と、シリンダ部３４の開口を塞ぐシリンダヘッド３７と、クランクケース１１に収納されているクランクシャフト１２と、このクランクシャフト１２より下位で且つシリンダ部３４へ寄った位置でクランクケース１１に収納されているカムシャフト３８と、クランクシャフト１２より下位で且つ反シリンダ部３４側へ寄った位置でクランクケース１１に収納されているバランサ軸１３と、バランサ軸１３の奥に配置されている潤滑油ポンプ２５と、次に述べるギヤ群及び動弁機構４０とからなる。 Next, the overall structure of the internal combustion engine will be described.
As shown in FIG. 2, the internal combustion engine 10 is moved to the crankcase 11, a cylinder portion 34 extending obliquely upward from the crankcase 11, a cylinder liner 35 fitted in the cylinder portion 34, and the cylinder liner 35. A piston 36 that is freely housed, a connecting rod 28 that extends from the piston 36, a cylinder head 37 that closes the opening of the cylinder portion 34, a crankshaft 12 that is housed in the crankcase 11, and lower than the crankshaft 12 The camshaft 38 accommodated in the crankcase 11 at a position close to the cylinder portion 34 and the balancer shaft 13 accommodated in the crankcase 11 at a position lower than the crankshaft 12 and close to the counter-cylinder portion 34 side. And the lubricating oil pump 2 disposed in the back of the balancer shaft 13 If, consisting described below gears and valve operating mechanism 40.

クランクシャフト１２に第１駆動ギヤ２１及びこの第１駆動ギヤ２１より小径の第２駆動ギヤ２２が設けられており、大径の第１駆動ギヤ２１に第１従動ギヤ２３が噛み合い、この第１従動ギヤ２３によりバランサ軸１３及び潤滑油ポンプ２５が駆動される。
また、小径の第２駆動ギヤ２２に大径の第２従動ギヤ４１が噛み合い、この第２従動ギヤ４１によりカムシャフト３８が駆動される。このカムシャフト３８が動弁機構４０の駆動源となる。 The crankshaft 12 is provided with a first drive gear 21 and a second drive gear 22 having a smaller diameter than the first drive gear 21, and a first driven gear 23 is engaged with the first drive gear 21 having a larger diameter. The balancer shaft 13 and the lubricating oil pump 25 are driven by the driven gear 23.
The second driven gear 41 having a large diameter is engaged with the second driving gear 22 having a small diameter, and the cam shaft 38 is driven by the second driven gear 41. The camshaft 38 is a drive source for the valve mechanism 40.

すなわち、動弁機構４０は、カムシャフト３８と、このカムシャフト３８のカム４２で押し上げられるプッシュロッド４３と、シリンダヘッド３７に揺動自在に支持されプッシュロッド４３で揺動されバルブ４４を開くロッカアーム４５と、バルブ４４を弁閉するバルブスプリング４６とからなる。動弁機構４０により、ピストン３６のポジション（クランクシャフト１２の回転角度）に対応してバルブ４４を開閉させることができる。   That is, the valve operating mechanism 40 includes a camshaft 38, a push rod 43 pushed up by the cam 42 of the camshaft 38, and a rocker arm that is swingably supported by the cylinder head 37 and swings by the push rod 43 to open the valve 44. 45 and a valve spring 46 for closing the valve 44. The valve mechanism 40 can open and close the valve 44 in accordance with the position of the piston 36 (the rotation angle of the crankshaft 12).

次に、図２と視点を１８０°変えた図３に基づいて、潤滑油ポンプ２５を要部とする潤滑油供給装置を説明する。
図３に示すように、潤滑油供給装置４７は、潤滑油ポンプ２５と、この潤滑油ポンプ２５の吸入油路４８及び吐出油路４９とからなる。詳細には、吸入油路４８は潤滑油ポンプ２５の油吸入部５１に繋がっている。吐出油路４９は潤滑油ポンプ２５の油吐出部５２から延びて平軸受（図１、符号１６）の環状溝２７に繋がっている。そして、環状溝２７はシャフト内油路５３でクランク軸受（図１、符号２９）に繋がっている。 Next, a lubricating oil supply apparatus having the lubricating oil pump 25 as a main part will be described with reference to FIG.
As shown in FIG. 3, the lubricating oil supply device 47 includes a lubricating oil pump 25 and a suction oil passage 48 and a discharge oil passage 49 of the lubricating oil pump 25. Specifically, the suction oil passage 48 is connected to the oil suction part 51 of the lubricating oil pump 25. The discharge oil passage 49 extends from the oil discharge portion 52 of the lubricating oil pump 25 and is connected to the annular groove 27 of the plain bearing (reference numeral 16 in FIG. 1). The annular groove 27 is connected to the crank bearing (reference numeral 29 in FIG. 1) by an oil passage 53 in the shaft.

次に、潤滑油ポンプ２５の構造と作用を説明する。
図４（ａ）に示すように、潤滑油ポンプ２５は、ポンプ軸２６と、このポンプ軸２６で図反時計方向に回され複数（この例では４個）の歯５５を有するインナーロータ５６と、このインナーロータ５６より多い複数（この例では５個）の内歯５７を有しインナーロータ５６で回されるアウターロータ５８と、このアウターロータ５８を回転自在に収納するポンプハウジング部５９とからなるトロコイドポンプが好適である。ポンプハウジング部５９はクランクケースの一部である。 Next, the structure and operation of the lubricating oil pump 25 will be described.
As shown in FIG. 4A, the lubricating oil pump 25 includes a pump shaft 26, an inner rotor 56 having a plurality of (four in this example) teeth 55 rotated counterclockwise by the pump shaft 26. An outer rotor 58 having a plurality of (five in this example) inner teeth 57 larger than the inner rotor 56 and rotated by the inner rotor 56, and a pump housing part 59 for rotatably housing the outer rotor 58 A trochoid pump is preferred. The pump housing part 59 is a part of the crankcase.

インナーロータ５６とアウターロータ５８とで歯数が異なるため、（ａ）に斜線で示すようなポンプ空間６１ができる。このポンプ空間６１は（ｂ）では、増大する。この容積増大により、吸引作用が起こり、油吸入部５１を介して潤滑油がポンプ空間６１に導かれる。（ｃ）でポンプ空間６１が油吸入部５１から油吐出部５２へ移り、（ｄ）でポンプ空間６１から潤滑油が油吐出部５２へ吐出される。
すなわち、ポンプ空間６１が容積変化し、容積が増大する過程では潤滑油が吸引され、容積が減少する過程では潤滑油が吐出される。 Since the number of teeth is different between the inner rotor 56 and the outer rotor 58, a pump space 61 as shown by the oblique lines in FIG. This pump space 61 increases in (b). Due to this increase in volume, a suction action occurs, and the lubricating oil is guided to the pump space 61 via the oil suction portion 51. In (c), the pump space 61 is moved from the oil suction portion 51 to the oil discharge portion 52, and in (d), the lubricating oil is discharged from the pump space 61 to the oil discharge portion 52.
That is, the volume of the pump space 61 changes and the lubricating oil is sucked in the process of increasing the volume, and the lubricating oil is discharged in the process of decreasing the volume.

このような潤滑油ポンプ２５を要部とする潤滑油供給装置４７の好適なレイアウトを図５で説明する。
潤滑油ポンプ２５は、図５に示すように、クランクケース１１の肉厚内に収納されている。加えて、クランクケース１１に溜まっている潤滑油を潤滑油ポンプ２５へ導く吸入油路４８が、クランクケース１１の肉厚内に設けられると共に、潤滑油ポンプ２５で加圧された潤滑油をシャフト内油路（図３、符号５３）へ導く吐出油路４９が、クランクケース１１の肉厚内に設けられている。 A preferred layout of the lubricating oil supply device 47 having such a lubricating oil pump 25 as a main part will be described with reference to FIG.
As shown in FIG. 5, the lubricating oil pump 25 is accommodated within the thickness of the crankcase 11. In addition, a suction oil passage 48 that guides the lubricating oil accumulated in the crankcase 11 to the lubricating oil pump 25 is provided within the wall thickness of the crankcase 11, and the lubricating oil pressurized by the lubricating oil pump 25 is shafted. A discharge oil passage 49 that leads to the inner oil passage (FIG. 3, reference numeral 53) is provided in the wall thickness of the crankcase 11.

なお、吸入油路４８及び吐出油路４９は、クランクケース１１の肉厚内において、斜めや直交して設けることは差し支えない。例えば、吸入油路４８は、クランクケース１１の底面からキリで開けられ、油吸入部５１まで延びる直線通路６２と、この直線通路６２の途中からクランクケース１１の油溜まりへ通じる通孔６３と、直線通路６２の不要部分を塞ぐスチールボール（又はプラグ）６４とで構成することができる。この構成にすれば、吸入油路４８や吐出油路４９を、クランクケース１１の肉厚内に容易に形成することができる。   The intake oil passage 48 and the discharge oil passage 49 may be provided obliquely or orthogonally within the thickness of the crankcase 11. For example, the suction oil passage 48 is opened from the bottom surface of the crankcase 11 with a drill and extends to the oil suction portion 51, and a through hole 63 that leads from the middle of the straight passage 62 to the oil reservoir of the crankcase 11; A steel ball (or plug) 64 that blocks an unnecessary portion of the straight passage 62 can be used. With this configuration, the suction oil passage 48 and the discharge oil passage 49 can be easily formed within the thickness of the crankcase 11.

図から明らかなように、バランサ軸１３の一端に潤滑油ポンプ２５を備えながら、バランサ軸１３に油路を設けなくて済む。バランサ軸に油路を設ける従来の技術に比較して、本発明では、バランサ軸１３の加工が軽微となり、バランサ軸１３の設計が容易になる。   As is apparent from the figure, it is not necessary to provide an oil passage in the balancer shaft 13 while providing the lubricating oil pump 25 at one end of the balancer shaft 13. Compared to the conventional technique in which an oil passage is provided in the balancer shaft, in the present invention, processing of the balancer shaft 13 is light and the design of the balancer shaft 13 is facilitated.

なお、インナーロータ５６とアウターロータ５８とにより圧縮された潤滑油は、インナーロータ５６及びアウターロータ５８と玉軸受１８との間に設けたシール板６５でシールされるため、玉軸受１８側へ許容量を超えて漏れる心配はない。   Note that the lubricating oil compressed by the inner rotor 56 and the outer rotor 58 is sealed by the seal plate 65 provided between the inner rotor 56 and the outer rotor 58 and the ball bearing 18, and therefore allowed to the ball bearing 18 side. There is no worry of leaking beyond capacity.

尚、潤滑油ポンプ２５は、トロコイドポンプが好適であるが、ギヤポンプやベーンポンプであってもよく、形式は任意である。
また、潤滑油供給装置は、内燃機関に広く採用可能であるが、軽量、小型化が厳しく求められる小型の汎用エンジンに好適である。 The lubricating oil pump 25 is preferably a trochoid pump, but may be a gear pump or a vane pump, and the type is arbitrary.
The lubricating oil supply device can be widely used in internal combustion engines, but is suitable for small general-purpose engines that are required to be light and downsized.

本発明の潤滑油供給装置は、小型の汎用エンジンに好適である。   The lubricating oil supply apparatus of the present invention is suitable for a small general-purpose engine.

１０…内燃機関、１１…クランクケース、１２…クランクシャフト、１３…バランサ軸、２９…クランク軸受、４７…潤滑油供給装置、４８…吸入油路、４９…吐出油路、５３…シャフト内油路、６２…直線通路、６３…通孔。   DESCRIPTION OF SYMBOLS 10 ... Internal combustion engine, 11 ... Crankcase, 12 ... Crankshaft, 13 ... Balancer shaft, 29 ... Crank bearing, 47 ... Lubricating oil supply device, 48 ... Intake oil passage, 49 ... Discharge oil passage, 53 ... Shaft oil passage 62 ... Straight passage, 63 ... Through hole.

Claims (1)

クランクケースにクランクシャフト及びバランサ軸が収納され、前記クランクシャフトに潤滑油をクランク軸受へ導くシャフト内油路が設けられており、このシャフト内油路へ潤滑油を供給することで前記クランク軸受へ潤滑油を供給する内燃機関の潤滑油供給装置であって、
前記クランクケースに溜まっている潤滑油を吸い込み、加圧する潤滑油ポンプが、前記バランサ軸の一端に連結された形態で配置され、
前記クランクケースに溜まっている潤滑油を前記潤滑油ポンプへ導く吸入油路が、前記クランクケースの肉厚内に設けられると共に、前記潤滑油ポンプで加圧された潤滑油を前記シャフト内油路へ導く吐出油路が、前記クランクケースの肉厚内に設けられていることを特徴とする内燃機関の潤滑油供給装置。 A crankshaft and a balancer shaft are housed in the crankcase, and an oil passage in the shaft that guides lubricating oil to the crank bearing is provided in the crankshaft. By supplying the lubricating oil to the oil passage in the shaft, the crank bearing is provided. A lubricating oil supply device for an internal combustion engine that supplies lubricating oil,
A lubricating oil pump that sucks and pressurizes the lubricating oil accumulated in the crankcase is arranged in a form connected to one end of the balancer shaft,
An intake oil passage for guiding the lubricating oil accumulated in the crankcase to the lubricating oil pump is provided within the wall thickness of the crankcase, and the lubricating oil pressurized by the lubricating oil pump is supplied to the in-shaft oil passage. A lubricating oil supply device for an internal combustion engine, characterized in that a discharge oil passage leading to is provided in the wall thickness of the crankcase.
JP2010003990A 2010-01-12 2010-01-12 Lubricating oil supply device for internal combustion engine Pending JP2011144701A (en)

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