JPH08312321A - Cam shaft gear lubricating device in dohc type internal combustion engine - Google Patents
Cam shaft gear lubricating device in dohc type internal combustion engineInfo
- Publication number
- JPH08312321A JPH08312321A JP11723995A JP11723995A JPH08312321A JP H08312321 A JPH08312321 A JP H08312321A JP 11723995 A JP11723995 A JP 11723995A JP 11723995 A JP11723995 A JP 11723995A JP H08312321 A JPH08312321 A JP H08312321A
- Authority
- JP
- Japan
- Prior art keywords
- lubricating oil
- bearing
- cam shaft
- combustion engine
- internal combustion
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
- Lubrication Of Internal Combustion Engines (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、シリンダヘッドの上面
に、吸気弁用のカム軸と排気弁用のカム軸を配設して成
るＤＯＨＣ型の内燃機関において、前記両カム軸のうち
一方のカム軸の回転を他方のカム軸に伝達するための一
対の歯車に対して潤滑油を供給するための装置に関する
ものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DOHC type internal combustion engine in which a cam shaft for intake valves and a cam shaft for exhaust valves are provided on the upper surface of a cylinder head. And a device for supplying lubricating oil to a pair of gears for transmitting the rotation of the cam shaft to the other cam shaft.
【０００２】[0002]
【従来の技術】最近のＤＯＨＣ型においては、そのシリ
ンダヘッドの上面に配設した両カム軸のうち一方のカム
軸に、クランク軸の回転をタイミングベルト又はチエン
を介して伝達し、次いで、この一方のカム軸の回転を、
他方のカム軸に、これら両カム軸上に互いに噛合するよ
うに嵌着した一対の歯車を介して伝達するように構成す
ることが行われている。2. Description of the Related Art In the recent DOHC type, the rotation of the crankshaft is transmitted to one of the camshafts provided on the upper surface of the cylinder head through a timing belt or a chain, and then the rotation of the crankshaft is performed. Rotation of one cam shaft
It is configured to transmit to the other cam shaft via a pair of gears fitted on both cam shafts so as to mesh with each other.
【０００３】この場合、先行技術としての実開昭６１−
１２５６１７号公報は、前記一対の歯車に対して潤滑油
を供給するための装置として、内燃機関における潤滑油
ポンプからの潤滑油を、前記一方のカム軸又は他方のカ
ム軸の内部に穿設した潤滑油通路に導入したのち、この
潤滑油通路より前記一対の歯車に対して供給することを
提案している。[0003] In this case, as a prior art, the actual development 61-
Japanese Patent No. 125617 discloses a device for supplying lubricating oil to the pair of gears, in which lubricating oil from a lubricating oil pump in an internal combustion engine is bored inside the one cam shaft or the other cam shaft. It is proposed that the lubricant be introduced into the lubricating oil passage and then supplied to the pair of gears from the lubricating oil passage.
【０００４】[0004]
【発明が解決しようとする課題】しかし、この先行技術
における潤滑装置は、内燃機関における潤滑油ポンプか
ら吐出される潤滑油の一部を、前記両カム軸間における
一対の歯車に対して供給するものであることにより、前
記潤滑油ポンプにおける潤滑油の吐出量を、当該潤滑油
ポンプから吐出される潤滑油の一部を前記一対の歯車に
対して供給する分だけ多くしなければならず、換言する
と、潤滑油ポンプを、それだけ大きくしなければならな
いから、前記一対の歯車を潤滑するこめのために、内燃
機関における出力の機械損失が増大するばかりか、潤滑
油ポンプの大型化、ひいては、当該潤滑油ポンプを含む
内燃機関全体の大型化を招来すると言う問題があった。However, the lubricating device in this prior art supplies a part of the lubricating oil discharged from the lubricating oil pump in the internal combustion engine to the pair of gears between the cam shafts. Therefore, the discharge amount of the lubricating oil in the lubricating oil pump must be increased by the amount of a part of the lubricating oil discharged from the lubricating oil pump that is supplied to the pair of gears. In other words, since the lubricating oil pump has to be increased in size, not only the mechanical loss of the output of the internal combustion engine increases due to the lubrication of the pair of gears, but also the lubricating oil pump becomes large in size and eventually, There is a problem in that the internal combustion engine including the lubricating oil pump becomes large in size.
【０００５】本発明は、カム軸の一端における軸受け部
を潤滑したあとの潤滑油を利用して、前記一対の歯車を
潤滑することにより、前記の問題を解消することを技術
的課題とするものである。An object of the present invention is to solve the above-mentioned problems by lubricating the pair of gears by utilizing the lubricating oil after lubricating the bearing portion at one end of the cam shaft. Is.
【０００６】[0006]
【課題を解決するための手段】この技術的課題を達成す
るため本発明は、「シリンダヘッドの上面に配設した吸
気弁用カム軸及び排気弁用カム軸における端部を、上面
に半円形軸受け孔を有するようにシリンダヘッド側に一
体的に設けた軸受け座と、この軸受け座に対して締結さ
れ下面に半円形軸受け孔を備えた軸受けキャップ体とか
ら成る軸受け部にて軸支し、この軸受け部に潤滑油供給
通路を設ける一方、前記両カム軸のうち前記軸受け座に
隣接した部位の各々に、互いに噛合する歯車を嵌着して
成るＤＯＨＣ型内燃機関において、前記軸受け座に、当
該軸受け座における一方の半円形軸受け孔の外側に潤滑
油溜凹所を設けると共に、オイル通路を、当該オイル通
路の一端が前記潤滑油溜凹所内に開口し他端が前記一方
の歯車の側面に対して開口するように穿設する。」と言
う構成にした。In order to achieve this technical object, the present invention provides "a semicircular upper surface of an end portion of an intake valve cam shaft and an exhaust valve cam shaft disposed on an upper surface of a cylinder head. The bearing seat is integrally provided on the cylinder head side so as to have a bearing hole, and the bearing portion is supported by a bearing portion formed of a bearing cap body that is fastened to the bearing seat and has a semicircular bearing hole on the lower surface. In the DOHC internal combustion engine, in which a gear that meshes with each other is fitted to each of the portions of the camshafts adjacent to the bearing seat while the lubricating oil supply passage is provided in the bearing part, A lubricating oil reservoir recess is provided outside one of the semi-circular bearing holes in the bearing seat, and an oil passage is formed such that one end of the oil passage opens into the lubricating oil reservoir recess and the other end is a side surface of the one gear. Against It was constructed to say that bored so as to be opened. "Te.
【０００７】[0007]
【作 用】この構成において、軸受け部に対して供給
された潤滑油は、当該軸受け部を潤滑したのち、その外
側に設けた潤滑油溜凹所内に溜まり、次いで、この潤滑
油溜凹所内からオイル通路を通って一方の歯車の側面に
対して順次供給される。すなわち、両カム軸間における
一対の歯車を、これに一方のカム軸に対する軸受け部を
潤滑した後の潤滑油を逐次潤滑することができる。[Operation] In this configuration, the lubricating oil supplied to the bearing portion collects in the lubricating oil reservoir recess provided outside after lubricating the bearing portion, and then from the lubricating oil reservoir recess. It is sequentially supplied to the side surface of one gear through the oil passage. That is, the pair of gears between the cam shafts can be sequentially lubricated with the lubricating oil after lubricating the bearing portion for one of the cam shafts.
【０００８】[0008]
【発明の効果】このように、本発明によると、両カム軸
間における一対の歯車を、一方のカム軸に対する軸受け
部を潤滑した後の潤滑油にて潤滑することができること
により、前記先行技術のように、内燃機関における潤滑
油ポンプからの潤滑油の一部を前記一対の歯車に対して
供給するものに比べて、潤滑油ポンプの吐出量をその分
だけ節減できるから、内燃機関における出力の機械損失
を低減できると共に、前記潤滑油ポンプの小型化、ひい
ては、この潤滑油ポンプを含む内燃機関全体の小型化を
図ることができる効果を有する。As described above, according to the present invention, the pair of gears between the cam shafts can be lubricated with the lubricating oil after the bearing portion for one cam shaft is lubricated. As described above, as compared with the case where a part of the lubricating oil from the lubricating oil pump in the internal combustion engine is supplied to the pair of gears, the discharge amount of the lubricating oil pump can be reduced accordingly, so the output in the internal combustion engine It is possible to reduce the mechanical loss and to downsize the lubricating oil pump, and further downsize the entire internal combustion engine including the lubricating oil pump.
【０００９】[0009]
【実施例】以下、本発明の実施例を、図１〜図４の図面
について説明する。この図において符号１は、シリンダ
ブロックを、符号２は、前記シリンダブロック１の上面
に図示しない複数本のヘッドボルトにて締結したシリン
ダヘッドを示す。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to the drawings of FIGS. In this figure, reference numeral 1 indicates a cylinder block, and reference numeral 2 indicates a cylinder head fastened to the upper surface of the cylinder block 1 by a plurality of head bolts (not shown).
【００１０】符号５は、吸気弁６に対するカム軸を、符
号７は、排気弁８に対するカム軸を各々示し、これら両
カム軸５，７は、前記シリンダヘッド２の上面における
動弁機構室２ａ内に互いに平行に配設され、且つ、各気
筒間の部位における中間軸受け部４ａ，４ｂと、一端部
における軸受け部３とで軸支されている。また、前記両
カム軸５，７は、前記軸受け部３の内側に互いに噛合す
るように配設した歯車８，９にて互いに連動回転するよ
うに構成されている一方、前記両カム軸５，７のうち一
方のカム軸７が前記軸受け部３より外側に突出する軸端
部にタイミングプーリ１０を嵌着して、このタイミング
プーリ１０にクランク軸（図示せず）からのタイミング
ベルト１１を巻掛けすることにより、一方のカム軸７
に、クランク軸の回転を伝達し、この一方のカム軸７か
ら他方のカム軸５に回転を伝達するように構成されてい
る。Reference numeral 5 indicates a cam shaft for the intake valve 6, and reference numeral 7 indicates a cam shaft for the exhaust valve 8. Both cam shafts 5, 7 are a valve mechanism chamber 2a on the upper surface of the cylinder head 2. They are arranged in parallel with each other, and are axially supported by the intermediate bearing portions 4a and 4b at the portions between the cylinders and the bearing portion 3 at one end. The two cam shafts 5 and 7 are configured to rotate interlockingly with each other by gears 8 and 9 which are arranged inside the bearing portion 3 so as to mesh with each other. A timing pulley 10 is fitted to the shaft end portion of one of the cam shafts 7 that projects outward from the bearing portion 3, and a timing belt 11 from a crank shaft (not shown) is wound around the timing pulley 10. One cam shaft 7 by hanging
First, the rotation of the crankshaft is transmitted, and the rotation is transmitted from the one camshaft 7 to the other camshaft 5.
【００１１】そして、前記軸受け部３は、シリンダヘッ
ド２に一体的に造形した軸受け座１２と、その上面側に
配設した軸受けキャップ１３とを備え、前記軸受け座１
２の上面には、前記吸気弁用カム軸５におけるジャーナ
ル部５ａの下半分が嵌まる半円形軸受け孔１２ａと、前
記排気弁用カム軸７におけるジャーナル部７ａの下半分
が嵌まる半円形軸受け孔１２ｂを備える一方、前記軸受
けキャップ１３の下面には、前記吸気弁用カム軸５にお
けるジャーナル部５ａの上半分が嵌まる半円形軸受け孔
１３ａと、前記排気弁用カム軸７におけるジャーナル部
７ａの上半分が嵌まる半円形軸受け孔１３ｂを備え、そ
して、前記前記軸受けキャップ体１３を、前記シリンダ
ヘッド２側の軸受け座１２に対して、三本のボルト１
４，１５，１６にて締結するように構成されている。The bearing portion 3 is provided with a bearing seat 12 formed integrally with the cylinder head 2 and a bearing cap 13 provided on the upper surface side of the bearing seat 12.
On the upper surface of 2, a semicircular bearing hole 12a into which the lower half of the journal portion 5a of the intake valve cam shaft 5 is fitted, and a semicircular bearing into which the lower half of the journal portion 7a of the exhaust valve cam shaft 7 is fitted. On the lower surface of the bearing cap 13, a semicircular bearing hole 13a into which the upper half of the journal portion 5a of the intake valve cam shaft 5 is fitted, and a journal portion 7a of the exhaust valve cam shaft 7 are provided. A semicircular bearing hole 13b into which the upper half of the bearing is fitted, and the bearing cap body 13 is attached to the bearing seat 12 on the cylinder head 2 side by three bolts 1
It is configured to be fastened at 4, 15, 16.
【００１２】また、前記軸受け座１２及び軸受けキャッ
プ１３のうち吸気弁用カム軸５におけるジャーナル部５
ａが嵌まる半円形軸受け孔１２ａ及び半円形軸受け孔１
３ａの外側の部分に、ボス部１２ｃ，１３ｃを外向きに
突出するように一体的に設けられ、このボス部１２ｃ，
１３ｃ内に、前記吸気弁用カム軸５に設けたスラスト受
け円板５ｂが嵌まる環状溝１２ｃ′，１３ｃ′と、前記
吸気弁用カム軸５の軸端部５ｃが嵌まる軸受け孔１２
ｃ″，１３ｃ″とが設けられている。Further, of the bearing seat 12 and the bearing cap 13, the journal portion 5 of the intake valve camshaft 5 is used.
Semi-circular bearing hole 12a and semi-circular bearing hole 1 into which a is fitted
Boss portions 12c and 13c are integrally provided on the outer side of 3a so as to project outward.
Inside 13c, annular grooves 12c 'and 13c' in which the thrust receiving disk 5b provided in the intake valve cam shaft 5 is fitted, and a bearing hole 12 in which the shaft end portion 5c of the intake valve cam shaft 5 is fitted.
c ″ and 13c ″ are provided.
【００１３】更にまた、前記シリンダヘッド２には、シ
リンダブロック１側におけるメイン潤滑油通路（図示せ
ず）に連通し、図示しない潤滑油ポンプからの潤滑油
を、前記軸受け座１２における両半円形軸受け孔１２
ａ，１２ｂに導くようにした潤滑油供給通路１７が穿設
されている。そして、前記軸受け座１２のボス部１２ｃ
における軸受け孔１２ｃ″の内面に、潤滑油溜凹所１８
を設ける一方、前記軸受け座１２に、オイル通路１９
を、当該オイル通路１９の一端が前記潤滑油溜凹所１８
内に開口し他端が前記吸気弁用カム軸５上における歯車
９の側面に対して開口するように穿設する。Furthermore, the cylinder head 2 communicates with a main lubricating oil passage (not shown) on the cylinder block 1 side, and lubricating oil from a lubricating oil pump (not shown) is introduced into the bearing seats 12 in both semicircular shapes. Bearing hole 12
A lubricating oil supply passage 17 is formed so as to lead to a and 12b. Then, the boss portion 12c of the bearing seat 12
On the inner surface of the bearing hole 12c ″ in FIG.
While the bearing seat 12 is provided with an oil passage 19
One end of the oil passage 19 has the lubricating oil reservoir recess 18
It is opened so that the other end is opened to the side surface of the gear 9 on the intake valve cam shaft 5.
【００１４】この構成において、吸気弁用カム軸５にお
けるジャーナル部５ａ及び排気弁用カム軸７におけるジ
ャーナル部７ａは、これに潤滑油ポンプからの潤滑油が
潤滑油供給通路１７を介して供給されることにより潤滑
される。前記吸気弁用カム軸５におけるジャーナル部５
ａを潤滑したあとの潤滑油の一部が、その外側に設けた
潤滑油溜凹所１８内に溜まり、次いで、この潤滑油溜凹
所１８内からオイル通路１９を通って吸気弁用カム軸５
上における歯車８の側面に対して順次供給されるから、
両カム軸５，７間における一対の歯車８，９を潤滑する
ことができるのである。In this structure, the journal portion 5a of the intake valve cam shaft 5 and the journal portion 7a of the exhaust valve cam shaft 7 are supplied with lubricating oil from the lubricating oil pump through the lubricating oil supply passage 17. To be lubricated. Journal portion 5 of the intake valve camshaft 5
A part of the lubricating oil after lubricating a is accumulated in the lubricating oil reservoir recess 18 provided on the outer side thereof, and then passes through the oil passage 19 from the lubricating oil reservoir recess 18 to form the intake valve camshaft. 5
Since it is sequentially supplied to the side surface of the gear 8 above,
The pair of gears 8 and 9 between the cam shafts 5 and 7 can be lubricated.
【００１５】なお、前記実施例は、潤滑油溜凹所１８及
びオイル通路１９を、吸気弁用カム軸５に対する軸受け
部側に設けた場合を示したが、本発明は、これに限ら
ず、潤滑油溜凹所１８及びオイル通路１９を、排気弁用
カム軸７に対する軸受け部側に設けても良いことは言う
までもない。In the above embodiment, the lubricating oil reservoir recess 18 and the oil passage 19 are provided on the bearing side of the intake valve camshaft 5, but the present invention is not limited to this. It goes without saying that the lubricating oil reservoir recess 18 and the oil passage 19 may be provided on the bearing portion side of the exhaust valve cam shaft 7.
【図１】本発明の実施例を示すシリンダヘッドの平面図
である。FIG. 1 is a plan view of a cylinder head showing an embodiment of the present invention.
【図２】図１のII−II視断面図である。FIG. 2 is a sectional view taken along line II-II of FIG.
【図３】図１のIII −III 視断面図である。FIG. 3 is a sectional view taken along line III-III in FIG.
【図４】図１のIV−IV視拡大断面図である。FIG. 4 is an enlarged sectional view taken along line IV-IV of FIG.
１ シリンダブロック ２ シリンダヘッド ３ 軸受け部 ５ 吸気弁用カム軸 ７ 排気弁用カム軸 ８，９ 歯車 １０ タイミングプーリ １１ タイミングベルト １２ 軸受け座 １３ 軸受けキャップ体 １８ 潤滑油溜凹所 １９ オイル通路 1 Cylinder Block 2 Cylinder Head 3 Bearing Part 5 Intake Valve Cam Shaft 7 Exhaust Valve Cam Shaft 8, 9 Gear 10 Timing Pulley 11 Timing Belt 12 Bearing Seat 13 Bearing Cap Body 18 Lubricating Oil Recess 19 Oil Passage
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｆ０２Ｆ 1/24 Ｆ０２Ｆ 1/24 Ｒ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display area F02F 1/24 F02F 1/24 R
Claims (1)
カム軸及び排気弁用カム軸における端部を、上面に半円
形軸受け孔を有するようにシリンダヘッド側に一体的に
設けた軸受け座と、この軸受け座に対して締結され下面
に半円形軸受け孔を備えた軸受けキャップ体とから成る
軸受け部にて軸支し、この軸受け部に潤滑油供給通路を
設ける一方、前記両カム軸のうち前記軸受け座に隣接し
た部位の各々に、互いに噛合する歯車を嵌着して成るＤ
ＯＨＣ型内燃機関において、前記軸受け座に、当該軸受
け座における一方の半円形軸受け孔の外側に潤滑油溜凹
所を設けると共に、オイル通路を、当該オイル通路の一
端が前記潤滑油溜凹所内に開口し他端が前記一方の歯車
の側面に対して開口するように穿設したことを特徴とす
るＤＯＨＣ型内燃機関におけるカム軸用歯車の潤滑装
置。1. A bearing seat integrally provided on the cylinder head side so that the ends of the intake valve camshaft and the exhaust valve camshaft disposed on the upper surface of the cylinder head are provided with a semicircular bearing hole on the upper surface. And a bearing cap which is fastened to the bearing seat and has a semicircular bearing hole on the lower surface, and is rotatably supported by a bearing portion, and a lubricating oil supply passage is provided in the bearing portion. Of the parts adjacent to the bearing seat, gears meshing with each other are fitted to each other D
In an OHC internal combustion engine, the bearing seat is provided with a lubricating oil reservoir recess outside one of the semicircular bearing holes in the bearing seat, and an oil passage is provided so that one end of the oil passage is in the lubricating oil reservoir recess. A lubricating device for a camshaft gear in a DOHC type internal combustion engine, characterized in that it is opened and the other end is opened to the side surface of the one gear.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11723995A JP3170175B2 (en) | 1995-05-16 | 1995-05-16 | Lubricating device for camshaft gear in DOHC type internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11723995A JP3170175B2 (en) | 1995-05-16 | 1995-05-16 | Lubricating device for camshaft gear in DOHC type internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH08312321A true JPH08312321A (en) | 1996-11-26 |
| JP3170175B2 JP3170175B2 (en) | 2001-05-28 |
Family
ID=14706836
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11723995A Expired - Fee Related JP3170175B2 (en) | 1995-05-16 | 1995-05-16 | Lubricating device for camshaft gear in DOHC type internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3170175B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999045245A1 (en) * | 1998-03-05 | 1999-09-10 | Komatsu Zenoah Co. | Cam room of portable four-cycle engine |
| WO2017168618A1 (en) * | 2016-03-30 | 2017-10-05 | 本田技研工業株式会社 | Lubricant supply structure of internal combustion engine for vehicle |
-
1995
- 1995-05-16 JP JP11723995A patent/JP3170175B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1999045245A1 (en) * | 1998-03-05 | 1999-09-10 | Komatsu Zenoah Co. | Cam room of portable four-cycle engine |
| WO2017168618A1 (en) * | 2016-03-30 | 2017-10-05 | 本田技研工業株式会社 | Lubricant supply structure of internal combustion engine for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3170175B2 (en) | 2001-05-28 |
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