JP2021156247A - Structure of cylinder head cover or baffle plate - Google Patents

Structure of cylinder head cover or baffle plate Download PDF

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JP2021156247A
JP2021156247A JP2020059269A JP2020059269A JP2021156247A JP 2021156247 A JP2021156247 A JP 2021156247A JP 2020059269 A JP2020059269 A JP 2020059269A JP 2020059269 A JP2020059269 A JP 2020059269A JP 2021156247 A JP2021156247 A JP 2021156247A
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cylinder head
camshaft
head cover
baffle plate
internal combustion
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JP7269195B2 (en
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雄介 鈴木
Yusuke Suzuki
雄介 鈴木
剛宏 旭
Takehiro Asahi
剛宏 旭
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Daihatsu Motor Co Ltd
Toyota Boshoku Corp
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Daihatsu Motor Co Ltd
Toyota Boshoku Corp
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Abstract

To more positively supply an outer peripheral surface of a cam shaft and promote lubrication between the outer peripheral surface of the cam shaft and an inner peripheral surface of a cam cap, to reduce friction and prevent seizure.SOLUTION: On a lower surface of a baffle plate 5 arranged above a camshaft that opens and closes an intake valve or exhaust valve of a cylinder of an internal combustion engine and below a cylinder head cover 4, at a predetermined portion located directly above the camshaft, a protrusion 51 projecting downward from a portion adjacent to the predetermined portion is formed.SELECTED DRAWING: Figure 2

Description

本発明は、内燃機関のシリンダヘッドカバーまたはその下方に配されるバッフルプレートの構造に関する。 The present invention relates to the structure of a cylinder head cover of an internal combustion engine or a baffle plate arranged below the cylinder head cover.

車両等に搭載されるレシプロエンジンでは、その出力軸であるクランクシャフトと、各気筒の吸排気バルブを開閉駆動するカムシャフトとを、巻掛伝動機構を介して連動させる。クランクシャフトにはクランクスプロケットを、カムシャフトにはカムシャフトをそれぞれ設け、これらクランクスプロケット及びカムスプロケットにタイミングチェーンを巻き掛けることにより、エンジントルクをクランクシャフトからカムシャフトに伝達し、カムシャフトをクランクシャフトに従動させて回転させる。そして、カムシャフトに固定したカムにより、吸排気バルブを押圧して開閉させる。 In a reciprocating engine mounted on a vehicle or the like, a crankshaft, which is an output shaft thereof, and a camshaft that opens and closes and drives the intake and exhaust valves of each cylinder are interlocked via a winding transmission mechanism. A crank sprocket is provided on the crankshaft, and a camshaft is provided on the camshaft. By winding a timing chain around the cranksprocket and the camshaft, engine torque is transmitted from the crankshaft to the camshaft, and the camshaft is transferred to the crankshaft. It is driven and rotated. Then, the intake / exhaust valve is pressed by the cam fixed to the camshaft to open and close it.

カムシャフトは、シリンダヘッドの上部に形成した軸受に載置する。さらに、カムシャフトの上方からカムキャップ（最前部にあるものは、フロントキャップと呼称されることがある）を被せ、そのカムキャップをシリンダヘットに締結して固定し、以てカムシャフトを軸受及びカムキャップに回転可能に保持させる。それら軸受、カムシャフト及びカムキャップ等は、シリンダヘッドカバーにより被覆する。 The camshaft is placed on a bearing formed on the upper part of the cylinder head. Furthermore, a cam cap (the one at the front is sometimes called a front cap) is put on from above the cam shaft, and the cam cap is fastened to the cylinder head to fix the cam shaft, thereby bearing and bearing the cam shaft. Hold the cam cap rotatably. The bearings, camshafts, cam caps, etc. are covered with a cylinder head cover.

内燃機関に付随するオイルポンプが吸込み吐出する潤滑油は、内燃機関の各所に向けて圧送され、各所を潤滑する。タイミングチェーンやスプロケット、カムシャフト等を潤滑した潤滑油は、回転するこれらにより掻き上げられ（または、巻き上げられ）る。シリンダヘッドカバーの下面側には、バッフルプレートを装着しており、このバッフルフレートによって掻き上げられる潤滑油を受け止める（以上、例えば下記特許文献を参照）。 The lubricating oil sucked and discharged by the oil pump attached to the internal combustion engine is pumped toward various parts of the internal combustion engine to lubricate each part. Lubricating oil that lubricates timing chains, sprockets, camshafts, etc. is scraped up (or wound up) by these rotating parts. A baffle plate is mounted on the lower surface side of the cylinder head cover to receive the lubricating oil scraped up by the baffle frate (see, for example, the following patent documents).

特開２０１９−０４４６８２号公報Japanese Unexamined Patent Publication No. 2019-044682

現状、カムシャフトの外周面とカムキャップの内周面との間の潤滑は、潤滑油の自然な浸透、いわば成り行きに任せている。 At present, the lubrication between the outer peripheral surface of the camshaft and the inner peripheral surface of the cam cap is left to the natural penetration of the lubricating oil, so to speak.

本発明は、より積極的に潤滑油をカムシャフトの外周面に供給し、カムシャフトの外周面とカムキャップの内周面との間の潤滑を促進して摩擦を軽減、焼き付きを未然に防ぐことを所期の目的としている。 The present invention more positively supplies lubricating oil to the outer peripheral surface of the camshaft, promotes lubrication between the outer peripheral surface of the camshaft and the inner peripheral surface of the cam cap, reduces friction, and prevents seizure. That is the intended purpose.

上述した課題を解決するべく、本発明では、内燃機関の気筒の吸気バルブまたは排気バルブを開閉駆動するカムシャフトの上方に配されるシリンダヘッドカバーの下面、またはカムシャフトの上方かつシリンダヘッドカバーの下方に配されるバッフルプレートの下面における、前記カムシャフトの直上に位置する所定部位に、当該所定部位に隣接する部位よりも下方に突出する突起を成形した。 In order to solve the above-mentioned problems, in the present invention, in the present invention, the lower surface of the cylinder head cover arranged above the camshaft for opening and closing the intake valve or the exhaust valve of the cylinder of the internal combustion engine, or above the camshaft and below the cylinder head cover. On the lower surface of the baffle plate to be arranged, a protrusion protruding downward from a portion adjacent to the predetermined portion was formed at a predetermined portion located directly above the camshaft.

本発明によれば、より積極的に潤滑油をカムシャフトの外周面に供給し、カムシャフトの外周面とカムキャップの内周面との間の潤滑を促進して摩擦を軽減でき、焼き付きを未然に防ぐことが可能となる。 According to the present invention, lubricating oil can be more positively supplied to the outer peripheral surface of the camshaft, lubrication between the outer peripheral surface of the camshaft and the inner peripheral surface of the cam cap can be promoted to reduce friction, and seizure can be achieved. It is possible to prevent it in advance.

本発明の一実施形態の内燃機関のシリンダヘッドカバー及びバッフルプレートの底面図。Bottom view of a cylinder head cover and a baffle plate of an internal combustion engine according to an embodiment of the present invention. 同実施形態の内燃機関の上部の構造を示す、内燃機関の後方から前方に向かって見たII−II線端面図。The end view of the line II-II seen from the rear side to the front side of the internal combustion engine which shows the structure of the upper part of the internal combustion engine of the same embodiment. 同実施形態の内燃機関の上部の構造を示す、内燃機関の側方から見たIII−III線端面図。The end view of the line III-III seen from the side of the internal combustion engine which shows the structure of the upper part of the internal combustion engine of the same embodiment. 同実施形態の内燃機関の上部の構造を示す、内燃機関の側方から見たIV−IV線端面図。The IV-IV line end view seen from the side of the internal combustion engine which shows the structure of the upper part of the internal combustion engine of the same embodiment.

本発明の一実施形態を、図面を参照して説明する。本実施形態における内燃機関は、車両等に動力源として搭載されるレシプロエンジンである。図１ないし図４に、本実施形態の内燃機関の上部の構造を示す。図１は、内燃機関のシリンダヘッドカバー４及びバッフルプレート５の底面図である。なお、図１中、バッフルプレート５に網点を付して表している。図２は、内燃機関の後方（リア側）から前方（フロント側）に向かって見たII−II線端面図である。図３は、内燃機関の側方から見た、吸気カムシャフト１の中心軸を通る切断面に沿って切断したIII−III線端面図である。図４は、内燃機関の側方から見た、排気カムシャフト２の中心軸を通る切断面に沿って切断したIV−IV線端面図である。 An embodiment of the present invention will be described with reference to the drawings. The internal combustion engine in this embodiment is a reciprocating engine mounted as a power source in a vehicle or the like. 1 to 4 show the structure of the upper part of the internal combustion engine of the present embodiment. FIG. 1 is a bottom view of a cylinder head cover 4 and a baffle plate 5 of an internal combustion engine. In FIG. 1, halftone dots are attached to the baffle plate 5. FIG. 2 is an end view of the line II-II viewed from the rear (rear side) to the front (front side) of the internal combustion engine. FIG. 3 is an end view of line III-III cut along a cut surface passing through the central axis of the intake camshaft 1 as viewed from the side of the internal combustion engine. FIG. 4 is an end view of the IV-IV line cut along a cut surface passing through the central axis of the exhaust camshaft 2 as viewed from the side of the internal combustion engine.

内燃機関の各気筒の吸気バルブを開閉駆動する吸気カムシャフト１、排気カムシャフト２を開閉駆動する排気カムシャフト２はそれぞれ、シリンダヘッド３の上部に形成した軸受３１に載置する。さらに、それらカムシャフト１、２の上方からカムキャップ６、７を被せ、そのカムキャップ６、７をシリンダヘッド３に締結して固定し、以てカムシャフト１、２を軸受３１及びカムキャップ６、７に回転可能に保持させる。なお、複数個のカムキャップ６、７のうち、内燃機関の最前部に位置するカムキャップ６は、フロントキャップと呼称されることがある。 The intake camshaft 1 that opens and closes the intake valve of each cylinder of the internal combustion engine and the exhaust camshaft 2 that opens and closes the exhaust camshaft 2 are each placed on a bearing 31 formed on the upper part of the cylinder head 3. Further, the cam caps 6 and 7 are covered from above the cam shafts 1 and 2, and the cam caps 6 and 7 are fastened to the cylinder head 3 to fix the cam shafts 1 and 2 to the bearing 31 and the cam cap 6. , 7 rotatably hold. Of the plurality of cam caps 6 and 7, the cam cap 6 located at the frontmost portion of the internal combustion engine may be referred to as a front cap.

シリンダヘッド３に対しては、上方からシリンダヘッドカバー４を装着する。シリンダヘッド３内に設けた軸受３１、カムシャフト１、２及びカムキャップ６、７等は、シリンダヘッドカバー４により被覆されて隠蔽される。 The cylinder head cover 4 is attached to the cylinder head 3 from above. The bearing 31, camshafts 1, 2 and cam caps 6, 7 and the like provided in the cylinder head 3 are covered and concealed by the cylinder head cover 4.

シリンダヘッドカバー４の下面側には予め、バッフルプレート５を取り付けてある。シリンダヘッドカバー４をシリンダヘッド３に装着したとき、バッフルプレート５は、軸受３１、カムシャフト１、２及びカムキャップ６、７等に上方から臨むことになる。 A baffle plate 5 is attached in advance to the lower surface side of the cylinder head cover 4. When the cylinder head cover 4 is attached to the cylinder head 3, the baffle plate 5 faces the bearing 31, the camshafts 1, 2, the cam caps 6, 7, and the like from above.

しかして、本実施形態では、バッフルプレート５の下面の所定部位に、当該所定部位に隣接する部位よりも下方に突出した突起５１を複数成形している。より具体的には、突起５１は、吸気カムシャフト１及び排気カムシャフト２における、カムキャップ６に近接する部位の直上に位置している。 Therefore, in the present embodiment, a plurality of protrusions 51 projecting downward from the portion adjacent to the predetermined portion are formed on the predetermined portion on the lower surface of the baffle plate 5. More specifically, the protrusion 51 is located directly above the portion of the intake camshaft 1 and the exhaust camshaft 2 close to the cam cap 6.

回転するタイミングチェーンやスプロケット、カムシャフト１、２等は、潤滑油を掻き上げる。その掻き上げられる潤滑油は、バッフルプレート５の下面に付着する。バッフルプレート５の下面に付着した潤滑油は、突起５１に集まる。そして、図２ないし図４中に矢印で表すように、突起５１からカムシャフト１、２におけるカムキャップ６近傍の部位に垂れ落ちる。特に、図２に示しているように、カムキャップ６の一部にこれを上下に貫通した窓６１が開口しており、その窓６１の直上に突起５１を設けていれば、突起５１から垂れる潤滑油を窓６１を通じてカムシャフト１、２に滴下し、潤滑油をカムシャフト１、２の外周面とカムキャップ６の内周面との間に効果的に入り込ませることができる。 Rotating timing chains, sprockets, camshafts 1, 2, etc. scoop up lubricating oil. The scraped-up lubricating oil adheres to the lower surface of the baffle plate 5. The lubricating oil adhering to the lower surface of the baffle plate 5 collects on the protrusion 51. Then, as indicated by an arrow in FIGS. 2 to 4, the protrusion 51 hangs down from the protrusion 51 to a portion of the camshafts 1 and 2 near the cam cap 6. In particular, as shown in FIG. 2, if a window 61 penetrating the cam cap 6 up and down is opened in a part of the cam cap 6 and a protrusion 51 is provided directly above the window 61, the cam cap 6 hangs down from the protrusion 51. Lubricating oil can be dropped onto the camshafts 1 and 2 through the window 61, and the lubricating oil can be effectively allowed to enter between the outer peripheral surfaces of the camshafts 1 and 2 and the inner peripheral surface of the cam cap 6.

本実施形態では、内燃機関の気筒の吸気バルブや排気バルブを開閉駆動するカムシャフト１、２の上方かつシリンダヘッドカバー４の下方に配されるバッフルプレート５の下面における、前記カムシャフト１、２の直上に位置する所定部位に、当該所定部位に隣接する部位よりも下方に突出する突起５１を成形した。 In the present embodiment, the camshafts 1 and 2 on the lower surface of the baffle plate 5 arranged above the camshafts 1 and 2 for opening and closing the intake valve and the exhaust valve of the cylinder of the internal combustion engine and below the cylinder head cover 4. A protrusion 51 projecting downward from a portion adjacent to the predetermined portion was formed in a predetermined portion located directly above the predetermined portion.

本実施形態によれば、突起５１から潤滑油を垂れ落として積極的に潤滑油をカムシャフト１、２の外周面に供給し、カムシャフト１、２の外周面とカムキャップ６の内周面との間の潤滑を促進して摩擦を軽減することができる。ひいては、カムシャフト１、２とカムキャップ６との間で生ずる焼き付きを確実に防止することが可能となる。 According to the present embodiment, the lubricating oil drips from the protrusion 51 to positively supply the lubricating oil to the outer peripheral surfaces of the camshafts 1 and 2, and the outer peripheral surfaces of the camshafts 1 and 2 and the inner peripheral surface of the cam cap 6. Lubrication between and can be promoted to reduce friction. As a result, it is possible to reliably prevent seizure that occurs between the camshafts 1 and 2 and the cam cap 6.

なお、本発明は以上に詳述した実施形態に限られるものではない。例えば、上記実施形態では、シリンダヘッドカバー４の下面側に装着するバッフルプレート５の下面に突起５１を成形していたが、シリンダヘッドカバー４自体の下面の所定部位に、当該所定部位に隣接する部位よりも下方に突出する突起を成形し、その突起からカムシャフト１、２の外周面（におけるカムキャップ６、７近傍の部位）に潤滑油を垂れ落とすようにすることも考えられる。 The present invention is not limited to the embodiments described in detail above. For example, in the above embodiment, the protrusion 51 is formed on the lower surface of the baffle plate 5 mounted on the lower surface side of the cylinder head cover 4, but the predetermined portion on the lower surface of the cylinder head cover 4 itself is formed from a portion adjacent to the predetermined portion. It is also conceivable to form a protrusion protruding downward and allow the lubricating oil to drip from the protrusion onto the outer peripheral surfaces of the camshafts 1 and 2 (the portions in the vicinity of the cam caps 6 and 7).

その他、各部の具体的な構成は、本発明の趣旨を逸脱しない範囲で種々変形が可能である。 In addition, the specific configuration of each part can be variously modified without departing from the spirit of the present invention.

１、２…カムシャフト
３…シリンダヘッド
３１…軸受
４…シリンダヘッドカバー
５…バッフルプレート
５１…突起
６…カムキャップ 1, 2 ... Camshaft 3 ... Cylinder head 31 ... Bearing 4 ... Cylinder head cover 5 ... Baffle plate 51 ... Protrusion 6 ... Cam cap

Claims (1)

内燃機関の気筒の吸気バルブまたは排気バルブを開閉駆動するカムシャフトの上方に配されるシリンダヘッドカバーの下面、またはカムシャフトの上方かつシリンダヘッドカバーの下方に配されるバッフルプレートの下面における、前記カムシャフトの直上に位置する所定部位に、当該所定部位に隣接する部位よりも下方に突出する突起を成形した、シリンダヘッドカバーまたはバッフルプレートの構造。 The camshaft on the lower surface of the cylinder head cover arranged above the camshaft that opens and closes the intake valve or the exhaust valve of the cylinder of the internal combustion engine, or on the lower surface of the baffle plate arranged above the camshaft and below the cylinder head cover. A structure of a cylinder head cover or a baffle plate in which a protrusion protruding downward from a portion adjacent to the predetermined portion is formed in a predetermined portion located directly above the predetermined portion.
JP2020059269A 2020-03-30 2020-03-30 Structure of cylinder head cover or baffle plate Active JP7269195B2 (en)

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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51113510U (en) * 1975-03-10 1976-09-14
JPS54145736U (en) * 1978-03-31 1979-10-09
JPH0219809U (en) * 1988-07-25 1990-02-09
JPH02211311A (en) * 1989-02-08 1990-08-22 Nissan Motor Co Ltd Lubrication device for engine
US5492086A (en) * 1994-09-15 1996-02-20 Durox Company, Inc. Valve cover
JP2014211124A (en) * 2013-04-19 2014-11-13 スズキ株式会社 Camshaft lubrication device
JP2015218694A (en) * 2014-05-21 2015-12-07 大豊工業株式会社 Oil supply member and lubricating oil supply mechanism for engine equipped therewith
JP2015229923A (en) * 2014-06-03 2015-12-21 本田技研工業株式会社 Lubricating oil supply structure of internal combustion engine bearing
JP2020045873A (en) * 2018-09-20 2020-03-26 ダイハツ工業株式会社 Internal combustion engine

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS51113510U (en) * 1975-03-10 1976-09-14
JPS54145736U (en) * 1978-03-31 1979-10-09
JPH0219809U (en) * 1988-07-25 1990-02-09
JPH02211311A (en) * 1989-02-08 1990-08-22 Nissan Motor Co Ltd Lubrication device for engine
US5492086A (en) * 1994-09-15 1996-02-20 Durox Company, Inc. Valve cover
JP2014211124A (en) * 2013-04-19 2014-11-13 スズキ株式会社 Camshaft lubrication device
JP2015218694A (en) * 2014-05-21 2015-12-07 大豊工業株式会社 Oil supply member and lubricating oil supply mechanism for engine equipped therewith
JP2015229923A (en) * 2014-06-03 2015-12-21 本田技研工業株式会社 Lubricating oil supply structure of internal combustion engine bearing
JP2020045873A (en) * 2018-09-20 2020-03-26 ダイハツ工業株式会社 Internal combustion engine

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