JP3417424B2 - Cylinder head of DOHC internal combustion engine - Google Patents
Cylinder head of DOHC internal combustion engineInfo
- Publication number
- JP3417424B2 JP3417424B2 JP05804494A JP5804494A JP3417424B2 JP 3417424 B2 JP3417424 B2 JP 3417424B2 JP 05804494 A JP05804494 A JP 05804494A JP 5804494 A JP5804494 A JP 5804494A JP 3417424 B2 JP3417424 B2 JP 3417424B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder head
- cylinder
- combustion engine
- internal combustion
- head
- 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.)
- Expired - Fee Related
Links
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
【０００１】
【産業上の利用分野】本発明は吸気弁と排気弁が別個の
カム軸により駆動されるＤＯＨＣ内燃機関のシリンダヘ
ツド、特に左右１対のカムキヤリヤをプラグ案内筒部で
一体に連結した構造のＤＯＨＣ内燃機関のシリンダヘツ
ドに関するものである。
【０００２】
【従来の技術】ＤＯＨＣ内燃機関において、カムキヤリ
ヤをシリンダヘツドと別体に構成することは、鋳造の際
に中子を必要としないという利点があるが、吸気弁と排
気弁をそれぞれ駆動する左右１対のカムキヤリヤが別体
であると、シリンダヘツドの内部へ取り付ける際の位置
決め用ダウエル、リーマボルトなどを備える必要がある
など加工や組立に手数がかかり、またシリンダヘツドの
中心から上方へ長いプラグ案内筒部が突出する構造にな
り、シリンダヘツドの鋳造に際し鋳型への湯（溶融金
属）の流れがよくないという問題がある。
【０００３】実開昭60-8445 号公報に開示されるＤＯＨ
Ｃ内燃機関のシリンダヘツドは、シリンダヘツドを下半
部と上半部とに水平な面で分割されているので、上述し
た鋳造上の問題は改善されるが、シリンダヘツドの構造
がやや複雑であり、ダイキヤスト鋳造には向かない。ま
た、シリンダヘツドの重合せ面に油の洩れを防止するガ
スケツトを介装する必要が生じる。
【０００４】
【発明が解決しようとする課題】本発明の目的は上述の
問題に鑑み、第２のシリンダヘツド（シリンダヘツドの
上半部）を別体としかつシリンダヘツドの内空部へ収容
し、第２のシリンダヘツドの左右１対のカムキヤリヤを
プラグ案内筒部で一体に結合し、鋳造や組立の作業性を
改善した、ＤＯＨＣ内燃機関のシリンダヘツドを提供す
ることにある。
【０００５】
【課題を解決するための手段】上記目的を達成するため
に、本発明の構成は左右１対のカムシヤフトを備えたＤ
ＯＨＣ内燃機関において、シリンダヘツドと、該シリン
ダヘツドの上端に結合したヘツドカバーと、前記シリン
ダヘツドとヘツドカバーとにより形成される内空部に納
められ、かつ前記シリンダヘツドの内空部の底面に重合
せ結合される第２のシリンダヘツドとを有し、第２のシ
リンダヘツドは少くとも各カムシヤフトの下半部を支持
するカムキヤリアと、プラグ案内筒と、カムキヤリアと
プラグ案内筒を連結する橋絡部とから形成されることを
特徴とする。
【０００６】また、本発明の構成は第２のシリンダヘツ
ドの左右のカムキヤリヤを、シリンダヘツドの内空部の
底部に備えた屋根形をなす左右１対の傾斜面に重合せ結
合したものである。
【０００７】
【作用】第２のシリンダヘツドは左右１対のカムキヤリ
ヤをプラグ案内筒部で一体に結合し、シリンダヘツドの
内空部の傾斜面に重ね合せる。好ましくは、プラグ案内
筒をシリンダヘツドの円筒部へ嵌合し、カムキヤリヤを
シリンダヘツドに位置決めする。これにより、鋳造性、
組立作業性が改善される。
【０００８】
【実施例】図１は本発明に係るＤＯＨＣ内燃機関、特に
直列４気筒１６弁型ＤＯＨＣ内燃機関のシリンダヘツド
の正面断面図、図２は同シリンダヘツドのカムキヤリヤ
の展開平面図である。シリンダヘツドＢは上半部を箱形
の周壁２で囲まれており、周壁２の上端フランジ２ａ
に、シール部材を介してヘツドカバー２１を結合され
る。シリンダヘツドＢの内空部の底部に屋根形に傾斜し
た左右１対の傾斜面３が備えられ、中心にプラグ取付孔
４が備えられる。プラグ取付孔４は上端に、僅かに上方
へ突出する円筒部４ａを一体に形成され、下端にプラグ
（点火栓または燃料噴射弁）を螺合するねじ孔４ｂを形
成される。シリンダヘツドＢの下面５は、図示してない
シリンダ本体の上にガスケツトを介して重ね合され、ボ
ルトにより締結される。シリンダヘツドＢは吸排気通
路、吸排気弁の弁座、弁ステムの案内孔などを備えてい
るが、本発明の要旨に関係しないので、図１にはそれら
の図示を省略し、ハツチングを付してない。
【０００９】本発明によれば、ハツチングで示す第２の
シリンダヘツドＣが、吸排気弁を開閉駆動するカム機構
を支持する左右１対のカムキヤリヤＡ１，Ａ２を、プラ
グ案内筒１４で一体に結合され、例えばダイキヤスト鋳
造などにより成形される。このため、各カムキヤリヤＡ
１，Ａ２にシリンダ配列方向に間隔を存して隔壁１６が
設けられ、各隔壁１６から突出する橋絡部１３により、
プラグ案内筒１４が１対のカムキヤリヤＡ１，Ａ２の間
に結合される。第２のシリンダヘツドＣのカムキヤリヤ
Ａ１，Ａ２の下面１８は、シリンダヘツドＢの内空部の
傾斜面３に重ね合され、プラグ案内筒１４は下端の大径
円筒部１４ａを、シリンダヘツドＢのプラグ取付孔４の
上端壁部から上方へ突出する円筒部４ａへ外嵌される。
こうして、第２のシリンダヘツドＣがシリンダヘツドＢ
の内空部へ位置決めされ、後述するボルトにより結合さ
れる。
【００１０】図２に示すように、第２のシリンダヘツド
Ｃの各カムキヤリヤＡ１，Ａ２はシリンダの配列方向
に、半円筒形のくぼみ１２を有しかつ配列ピツチｐで並
ぶ４つの隔壁１６と、８つのタペツト孔１５とを並設さ
れる。各隔壁１６に１対のボルト挿通孔１６ａが備えら
れる。カム軸１９（図１）は次のようにして各カムキヤ
リヤＡ１，Ａ２に支持される。隔壁１６のくぼみ１２に
カム軸１９を支持し、隔壁１６の平坦な上面に、半円筒
形のくぼみを有する軸受キヤツプ２０を重ね合せ、軸受
キヤツプ２０と隔壁１６のボルト挿通孔１６ａを貫通す
るボルト２２を、シリンダヘツドＢの傾斜面３に設けた
ねじ孔２３へ螺合する。こうして、軸受キヤツプ２０と
カムキヤリヤＡ１，Ａ２がシリンダヘツドＢへ締結され
る。
【００１１】上述のように、第２のシリンダヘツドＣの
左右１対のカムキヤリヤＡ１，Ａ２がプラグ案内筒１４
と橋絡部１３により一体に結合されるので、部品の管理
や機械加工が容易になり、大径円筒部１４ａと円筒部４
ａの嵌合により、第２のシリンダヘツドＣがシリンダヘ
ツドＢの内空部へ位置決めされるので、組立作業性が向
上される。
【００１２】
【発明の効果】本発明によれば、第２のシリンダヘツド
が左右１対のカムキヤリヤをプラグ案内筒部で一体に結
合して構成されるので、鋳造、加工が容易であり、第２
のシリンダヘツドがカムキヤリヤをプラグ案内筒により
シリンダヘツドへ位置決めされるので、位置決め用ダウ
エル、リーマボルトなどを備えなくてもよく、加工や組
立が容易になる。
【００１３】シリンダヘツドに上方へ突出する長いプラ
グ案内筒を設ける必要がないので、鋳型の形状が単純に
なり、シリンダヘツドの鋳造時、湯の廻りが改善され
る。
【００１４】吸気弁用カムキヤリヤと排気弁用カムキヤ
リヤが一体に連結されるので、別体の場合に生じる誤組
付けを回避できる。
【００１５】第２のシリンダヘツドのカムキヤリヤはシ
リンダヘツドの内空部に組み付けられるから、両者の重
合せ結合部からタペツト部の潤滑油が洩れるようなこと
があつても支障はなく、重合せ結合部へガスケツトやシ
ール部材を介装する必要がない。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plug guide for a cylinder head of a DOHC internal combustion engine in which an intake valve and an exhaust valve are driven by separate camshafts, in particular, a pair of left and right cam carriers. The present invention relates to a cylinder head of a DOHC internal combustion engine having a structure integrally connected by a cylindrical portion. 2. Description of the Related Art In a DOHC internal combustion engine, forming a cam carrier separately from a cylinder head has the advantage that a core is not required at the time of casting. However, the intake valve and the exhaust valve are respectively driven. If the pair of left and right cam carriers is separate, processing and assembly are troublesome, such as the need to provide a dowel for positioning and a reamer bolt when mounted inside the cylinder head, and the length is long from the center of the cylinder head. There is a problem in that the plug guide cylinder portion is protruded, and the flow of hot water (molten metal) to the mold during casting of the cylinder head is not good. [0003] DOH disclosed in Japanese Utility Model Laid-Open No. 60-8445
Since the cylinder head of the C internal combustion engine is divided into a lower half and an upper half by a horizontal plane, the above-described casting problem is improved, but the structure of the cylinder head is rather complicated. Yes, not suitable for die casting. Further, it is necessary to interpose a gasket for preventing oil leakage on the superposed surface of the cylinder head. SUMMARY OF THE INVENTION In view of the above problems, it is an object of the present invention to separate the second cylinder head (the upper half of the cylinder head) from the second cylinder head and accommodate the second cylinder head in the inner space of the cylinder head. It is another object of the present invention to provide a cylinder head of a DOHC internal combustion engine in which a pair of left and right cam carriers of a second cylinder head are integrally connected by a plug guide cylinder to improve workability in casting and assembly. [0005] In order to achieve the above object, the present invention is directed to a D-shaft having a pair of left and right camshafts.
In an OHC internal combustion engine, the cylinder head, a head cover connected to the upper end of the cylinder head, and an inner space formed by the cylinder head and the head cover are overlapped with a bottom surface of the inner space of the cylinder head. A second cylinder head coupled to the second cylinder head, the second cylinder head supporting at least a lower half of each camshaft, a plug guide cylinder, and a bridge connecting the cam carrier and the plug guide cylinder. Characterized by being formed from Further, in the structure of the present invention, the left and right cam carriers of the second cylinder head are overlapped and joined to a pair of left and right inclined surfaces having a roof shape provided at the bottom of the inner space of the cylinder head. . In the second cylinder head, a pair of left and right cam carriers are integrally connected by a plug guide cylinder, and are superposed on the inclined surface of the inner space of the cylinder head. Preferably, the plug guide cylinder is fitted into the cylindrical portion of the cylinder head, and the cam carrier is positioned on the cylinder head. As a result, castability,
Assembly workability is improved. FIG. 1 is a front sectional view of a cylinder head of a DOHC internal combustion engine according to the present invention, in particular, an in-line 4-cylinder 16-valve DOHC internal combustion engine, and FIG. 2 is a developed plan view of a cam carrier of the cylinder head. . The cylinder head B has an upper half portion surrounded by a box-shaped peripheral wall 2, and an upper end flange 2 a of the peripheral wall 2.
Then, the head cover 21 is connected via a seal member. A pair of left and right inclined surfaces 3 inclined in a roof shape is provided at the bottom of the inner space of the cylinder head B, and a plug mounting hole 4 is provided at the center. The plug mounting hole 4 is formed integrally with a cylindrical portion 4a projecting slightly upward at the upper end, and a screw hole 4b for screwing a plug (ignition plug or fuel injection valve) at the lower end. The lower surface 5 of the cylinder head B is overlaid on a cylinder body (not shown) via a gasket, and is fastened by bolts. Although the cylinder head B is provided with an intake / exhaust passage, a valve seat for an intake / exhaust valve, a guide hole for a valve stem, etc., they are not related to the gist of the present invention, and therefore are not shown in FIG. I haven't. According to the present invention, a pair of left and right cam carriers A1 and A2 for supporting a cam mechanism for opening and closing the intake and exhaust valves is integrally connected to the second cylinder head C indicated by hatching by the plug guide cylinder 14. Then, it is formed by, for example, die casting. Therefore, each cam carrier A
Partition walls 16 are provided at intervals in the cylinder arrangement direction on A1 and A2.
A plug guide cylinder 14 is connected between the pair of cam carriers A1, A2. The lower surfaces 18 of the cam carriers A1 and A2 of the second cylinder head C are superimposed on the inclined surface 3 in the inner space of the cylinder head B, and the plug guide cylinder 14 connects the large-diameter cylindrical portion 14a at the lower end to the cylinder head B. It is externally fitted to a cylindrical portion 4a protruding upward from the upper end wall of the plug mounting hole 4.
Thus, the second cylinder head C becomes the cylinder head B
Is positioned in the inner space, and connected by bolts described later. As shown in FIG. 2, each cam carrier A1, A2 of the second cylinder head C has a semi-cylindrical recess 12 in the cylinder arrangement direction and four partition walls 16 arranged in an arrangement pitch p. Eight tapet holes 15 are provided side by side. Each partition 16 is provided with a pair of bolt insertion holes 16a. The cam shaft 19 (FIG. 1) is supported by each of the cam carriers A1 and A2 as follows. The camshaft 19 is supported in the recess 12 of the partition 16, and a bearing cap 20 having a semi-cylindrical recess is superimposed on the flat upper surface of the partition 16, and a bolt penetrating through the bearing cap 20 and the bolt insertion hole 16 a of the partition 16. 22 is screwed into a screw hole 23 provided on the inclined surface 3 of the cylinder head B. Thus, the bearing cap 20 and the cam carriers A1, A2 are fastened to the cylinder head B. As described above, the pair of left and right cam carriers A1, A2 of the second cylinder head C are
And the bridging portion 13, the parts are easily managed and machined, and the large-diameter cylindrical portion 14 a and the cylindrical portion 4
By the fitting of a, the second cylinder head C is positioned in the inner space of the cylinder head B, so that the assembling workability is improved. According to the present invention, since the second cylinder head is formed by integrally connecting the pair of left and right cam carriers with the plug guide cylinder, casting and working are easy. 2
Because the cylinder head is positioned on the cylinder head by the plug guide cylinder, the positioning and dowels, the reamer bolts, etc. do not need to be provided, which facilitates the processing and assembly. Since there is no need to provide a long plug guide cylinder projecting upward on the cylinder head, the shape of the mold is simplified, and the flow of hot water during casting of the cylinder head is improved. Since the intake valve cam carrier and the exhaust valve cam carrier are integrally connected, erroneous assembly that occurs when they are separate can be avoided. Since the cam carrier of the second cylinder head is assembled to the inner space of the cylinder head, there is no problem even if the lubricating oil of the tapet portion leaks from the overlapped joint of the two cylinder heads. There is no need to interpose a gasket or seal member in the section.
【図面の簡単な説明】
【図１】本発明に係るＤＯＨＣ内燃機関のシリンダヘツ
ドの正面断面図である。
【図２】同ＤＯＨＣ内燃機関の第２のシリンダヘツドの
展開平面図である。
【符号の説明】
Ａ１，Ａ２：カムキヤリヤ Ｂ：シリンダヘツド Ｃ：
第２のシリンダヘツド２：周壁 ２ａ：上端フランジ
３：傾斜面 ４：プラグ取付孔 ４ａ：円筒部５：下面
４ｂ：ねじ孔 １２：くぼみ １３：橋絡部 １４：
プラグ案内筒１４ａ：大径円筒部 １５：タペツト孔
６：隔壁 １６ａ：ボルト挿通孔１８：下面 １９：カ
ム軸 ２０：軸受キヤツプBRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front sectional view of a cylinder head of a DOHC internal combustion engine according to the present invention. FIG. 2 is a developed plan view of a second cylinder head of the DOHC internal combustion engine. [Description of Signs] A1, A2: Cam carrier B: Cylinder head C:
Second cylinder head 2: peripheral wall 2a: upper end flange
3: Inclined surface 4: Plug mounting hole 4a: Cylindrical portion 5: Lower surface 4b: Screw hole 12: Recess 13: Bridge portion 14:
Plug guide cylinder 14a: Large-diameter cylindrical part 15: Tapet hole
6: Partition wall 16a: Bolt insertion hole 18: Lower surface 19: Cam shaft 20: Bearing cap
フロントページの続き (56)参考文献 特開 平２−108803（ＪＰ，Ａ) 特開 平２−31656（ＪＰ，Ａ) 特開 平４−22702（ＪＰ，Ａ) 特開 平３−249308（ＪＰ，Ａ) 特開 平５−86813（ＪＰ，Ａ) 特開 平１−253505（ＪＰ，Ａ) 実開 昭62−722（ＪＰ，Ｕ) 実開 平６−22502（ＪＰ，Ｕ) 実開 昭60−170005（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.7，ＤＢ名) F02F 1/00 - 7/00 F01L 1/00 - 1/46 Continuation of the front page (56) References JP-A-2-108803 (JP, A) JP-A-2-31656 (JP, A) JP-A-4-22702 (JP, A) JP-A-3-249308 (JP) JP-A-5-86813 (JP, A) JP-A-1-253505 (JP, A) JP-A-62-722 (JP, U) JP-A-6-22502 (JP, U) JP-A 60-170005 (JP, U) (58) Fields investigated (Int. Cl. 7 , DB name) F02F 1/00-7/00 F01L 1/00-1/46
Claims (1)
内燃機関において、シリンダヘツドと、該シリンダヘツ
ドの上端に結合したヘツドカバーと、前記シリンダヘツ
ドとヘツドカバーとにより形成される内空部に納めら
れ、かつ前記シリンダヘツドの内空部の底面に重合せ結
合される第２のシリンダヘツドとを有し、第２のシリン
ダヘツドは少くとも各カムシヤフトの下半部を支持する
カムキヤリアと、プラグ案内筒と、カムキヤリアとプラ
グ案内筒を連結する橋絡部とから形成されることを特徴
とする、ＤＯＨＣ内燃機関のシリンダヘツド。(57) [Claims 1] A DOHC provided with a pair of left and right camshafts
In an internal combustion engine, a cylinder head, a head cover connected to an upper end of the cylinder head, and an inner space formed by the cylinder head and the head cover are overlapped with a bottom surface of the inner space of the cylinder head. A second cylinder head, the second cylinder head comprising at least a cam carrier for supporting the lower half of each camshaft, a plug guide cylinder, and a bridge connecting the cam carrier and the plug guide cylinder. A cylinder head for a DOHC internal combustion engine, characterized in that it is formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05804494A JP3417424B2 (en) | 1994-03-03 | 1994-03-03 | Cylinder head of DOHC internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05804494A JP3417424B2 (en) | 1994-03-03 | 1994-03-03 | Cylinder head of DOHC internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH07243347A JPH07243347A (en) | 1995-09-19 |
| JP3417424B2 true JP3417424B2 (en) | 2003-06-16 |
Family
ID=13072941
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05804494A Expired - Fee Related JP3417424B2 (en) | 1994-03-03 | 1994-03-03 | Cylinder head of DOHC internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3417424B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3379064A1 (en) * | 2017-03-22 | 2018-09-26 | Honda Motor Co., Ltd. | Cylinder head of internal combustion engine |
-
1994
- 1994-03-03 JP JP05804494A patent/JP3417424B2/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP3379064A1 (en) * | 2017-03-22 | 2018-09-26 | Honda Motor Co., Ltd. | Cylinder head of internal combustion engine |
| US10900441B2 (en) | 2017-03-22 | 2021-01-26 | Honda Motor Co., Ltd. | Cylinder head of internal combustion engine |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07243347A (en) | 1995-09-19 |
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