JP2841307B2 - Lifter bore structure of cylinder head - Google Patents
Lifter bore structure of cylinder headInfo
- Publication number
- JP2841307B2 JP2841307B2 JP19293190A JP19293190A JP2841307B2 JP 2841307 B2 JP2841307 B2 JP 2841307B2 JP 19293190 A JP19293190 A JP 19293190A JP 19293190 A JP19293190 A JP 19293190A JP 2841307 B2 JP2841307 B2 JP 2841307B2
- Authority
- JP
- Japan
- Prior art keywords
- lifter
- cylinder head
- oil jacket
- bore
- lifter bore
- 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
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000005266 casting Methods 0.000 description 10
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000007547 defect Effects 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000010079 rubber tapping Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は、内燃機関のシリンダヘッド、特にシリンダ
ヘッドに設けられ吸排気バルブステム上端のリフタを嵌
挿するリフタボアの構造に関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cylinder head of an internal combustion engine, and more particularly, to a structure of a lifter bore provided in the cylinder head and fitted with a lifter at an upper end of an intake / exhaust valve stem.
従来、内燃機関のバルブ駆動機構は、例えば第４図に
示すように、シリンダヘッド41のボス部に設けられたリ
フタボア42内に、バルブステム43の上端に取付けられコ
イルスプリング44によってリテーナ45を介してバルブの
閉方向に付勢された円筒状のリフタ64が挿嵌され、リフ
タ46の頂面にシム板47を介してカム軸48により回転する
カム49が当接されている。そして、カム49の回転によっ
てリフタ46はリフタボア42内を上下に摺動してバルブの
開閉を行っている。Conventionally, as shown in FIG. 4, for example, a valve drive mechanism of an internal combustion engine is provided in a lifter bore 42 provided in a boss portion of a cylinder head 41 via a retainer 45 by a coil spring 44 attached to an upper end of a valve stem 43. A cylindrical lifter 64 urged in the closing direction of the valve is inserted and a cam 49 rotated by a cam shaft 48 is in contact with a top surface of the lifter 46 via a shim plate 47. The lifter 46 slides up and down in the lifter bore 42 by the rotation of the cam 49 to open and close the valve.
第４図中50はリフタボア42の下部に形成されたオイル
ジャケットである。In FIG. 4, reference numeral 50 denotes an oil jacket formed below the lifter bore 42.
ところで、リフタ46は、作動時にカム49の回転方向に
傾き、リフタ46とリフタボア42とで打音が生じやすいた
め、リフタボア42を下方に長くすればリフタ46も相対的
に長くすることができ、作動中リフタ46の傾きが少なく
なり、リフタ46とリフタボア42との打音を小さくするこ
とができる。By the way, the lifter 46 is inclined in the rotation direction of the cam 49 at the time of operation, and a tapping sound is easily generated between the lifter 46 and the lifter bore 42. Therefore, if the lifter bore 42 is lengthened downward, the lifter 46 can be relatively lengthened. During operation, the inclination of the lifter 46 is reduced, and the tapping sound between the lifter 46 and the lifter bore 42 can be reduced.
しかしながら、リフタボア42を下方に長くすると、そ
の下部のオイルジャケット50はウォータージャケット，
吸気ポート，排気ポート等により下方への延長が制限さ
れ、オイルジャケット50の高さが低くなる。However, when the lifter bore 42 is lengthened downward, the oil jacket 50 below the lifter bore 42 becomes a water jacket,
The downward extension is restricted by the intake port, the exhaust port, etc., and the height of the oil jacket 50 is reduced.
オイルジャケット50の高さが低くなることは、製造面
からみると、鋳造のためのオイルジャケット中子が薄く
なることであり、シリンダヘッド41の鋳造時、オイルジ
ャケット中子をセットする際に折れやすく、また注湯時
の振動，湯の注入力等によってこわれやすく、鋳造欠陥
が生じやすいという問題点があった。The lowering of the height of the oil jacket 50 means that the oil jacket core for casting becomes thinner from a manufacturing point of view, and when the cylinder head 41 is cast, the oil jacket core breaks when it is set. There is a problem that the casting is liable to be broken due to vibration at the time of pouring, pouring of pouring water, and the like, and casting defects are likely to occur.
本発明は、前記問題点を解決し、リフタボアを下方へ
長くすることによりオイルジャケットの高さが低くなっ
ても、オイルジャケット中子の強度を向上させ、鋳造に
支障をきたすことないようにすることができるシリンダ
ヘッドのリフタボア構造を提供することを目的とするも
のである。The present invention solves the above-mentioned problems, and improves the strength of the oil jacket core even if the height of the oil jacket is reduced by lengthening the lifter bore downward, so as not to hinder casting. It is an object of the present invention to provide a lifter bore structure of a cylinder head which can be used.
本発明は、一つの気筒に対し、二つの吸気バルブと二
つの排気バルブを備えた内燃機関のシリンダヘッドにお
いて、カム軸の回転により上下動する吸排気バルブステ
ム上端のリフタを摺動自在に挿嵌するリフタボア下端部
の前記カム軸方向側に切欠部を形成したことを特徴とす
るシリンダヘッドのリフタボア構造である。According to the present invention, a lifter at the upper end of an intake / exhaust valve stem that moves up and down by rotation of a camshaft is slidably inserted into a cylinder head of an internal combustion engine having two intake valves and two exhaust valves for one cylinder. A lifter structure for a cylinder head, wherein a cutout portion is formed on a lower end portion of the lifter bore to be fitted in the cam shaft direction side.
本発明のシリンダヘッドは、リフタボア下端部のカム
軸方向側に切欠部が形成されるために、リフタボア下部
のオイルジャケットを形成するための鋳造用のオイルジ
ャケット中子には切欠部に対応した肉厚部分が通ること
になり、中子としては補強リブを通す格好となって中子
強度が向上する。In the cylinder head of the present invention, since a notch is formed on the cam shaft direction side of the lower end of the lifter bore, the casting oil jacket core for forming the oil jacket below the lifter bore has a wall corresponding to the notch. The thick portion will pass through, and the core will pass through the reinforcing ribs, and the core strength will be improved.
従って、リフタボアを長くすることによってオイルジ
ャケットの高さが低くなり、鋳造用のオイルジャケット
中子が薄くなっても、第３図示の如く、オイルジャケッ
ト中子にはリフタボアの切欠部に対応した厚さのリブが
通ることになり、中子強度が向上し、薄い中子による鋳
造欠陥を回避することができる。Therefore, even if the height of the oil jacket is reduced by increasing the length of the lifter bore and the core of the oil jacket for casting becomes thinner, as shown in FIG. 3, the oil jacket core has a thickness corresponding to the cutout portion of the lifter bore. As a result, the core strength is improved and casting defects due to a thin core can be avoided.
なお、リフタは、カムの回転方向（カム軸と直角方
向）に傾く力を受けるが、リフタボア下端の切欠部はカ
ム軸方向側にのみ存在し、カム軸と直角方向には切欠部
がないために、リフタの傾き方向に対する切欠部の影響
は全くなく、リフタの作動には支障がない。The lifter receives a force that tilts in the cam rotation direction (direction perpendicular to the camshaft), but the notch at the lower end of the lifter bore exists only in the camshaft direction side, and there is no notch in the direction perpendicular to the camshaft. In addition, there is no influence of the notch on the tilt direction of the lifter, and there is no problem in the operation of the lifter.
本発明の一実施例を第１図及び第２図を参照して説明
すると、第１図はDOHC内燃機関のシリンダヘッド１の一
部の平面図で、シリンダヘッド１の上面には、図示しな
い各吸気バルブと排気バルブを開閉するためのカム軸が
支承される軸受部2,2が形成されている。支承されるカ
ム軸の下側には、回転するカムにより上下動する吸排気
バルブステム上端のリフタを摺動自在に嵌挿するリフタ
ボア３が設けられ、リフタボア３の下端部にはカム軸の
方向側に切欠部４が形成されている。An embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of a part of a cylinder head 1 of a DOHC internal combustion engine, and is not shown on an upper surface of the cylinder head 1. Bearing portions 2, 2 on which camshafts for opening and closing the intake valves and the exhaust valves are supported are formed. A lifter bore 3 is provided below the supported camshaft to slidably insert a lifter at the upper end of an intake / exhaust valve stem that moves up and down by a rotating cam, and the lower end of the lifter bore 3 has a camshaft direction. A notch 4 is formed on the side.
図中、５はリフタボア３の下部に形成されたオイルジ
ャケットで、その下部には隔壁６を介してウォータージ
ャケット７が形成されている。８は鋳造用のオイルジャ
ケット中子を示す（第３図受参照）。In the figure, reference numeral 5 denotes an oil jacket formed below the lifter bore 3, and a water jacket 7 is formed below the oil jacket via a partition 6. Reference numeral 8 denotes an oil jacket core for casting (see FIG. 3).
従って、リフタとの打音を小さくするためにリフタボ
ア３を下方に長くすると、その下部のオイルジャケット
５の高さが低くなり、シリンダヘッド１鋳造時のオイル
ジャケット中子８の厚さが薄くなるが、第３図の如く、
オイルジャケット中子にリフトボア３下端部の切欠部４
に対応した肉厚部分が形成され、オイルジャケット中子
８に補強用のリブを通したことになり、中子強度は向上
し、オイルジャケット中子８による鋳造欠陥は生じな
い。Therefore, when the lifter bore 3 is lengthened downward to reduce the hitting sound with the lifter, the height of the oil jacket 5 below the lifter bore 3 decreases, and the thickness of the oil jacket core 8 at the time of casting the cylinder head 1 decreases. However, as shown in FIG.
Notch 4 at lower end of lift bore 3 in oil jacket core
Is formed, the reinforcing ribs are passed through the oil jacket core 8, the core strength is improved, and casting defects due to the oil jacket core 8 do not occur.
以上述べたように、本発明は、シリンダヘッドのリフ
タボア下端部にリフタを移動させるカム軸方向側に切欠
部を形成したのみの簡単な構造によって、オイルジャケ
ット中子の強度が向上し、鋳造に支障をきたすことなく
リフタボアを下方へ延長することができ、しかもリフタ
の摺動に悪影響を与えることがない。As described above, according to the present invention, the strength of the oil jacket core is improved by a simple structure in which only the notch is formed on the cam shaft direction side for moving the lifter to the lower end of the lifter bore of the cylinder head. The lifter bore can be extended downward without hindrance, and does not adversely affect the sliding of the lifter.
第１図は本発明の一実施例を示すシリンダヘッドの部分
的平面図、第２図は第１図Ｉ−Ｉ線断面図、第３図は第
２図の一部でオイルジャケット中子のセット状態説明
図、第４図は従来の組立断面説明図である。 1,41……シリンダヘッド、２……軸受部、 3,42……リフタボア、４……切欠部、5,50……オイルジ
ャケット、８……ウォータージャケット、43……バルブ
ステム、44……コイルスプリング、46……リフタ、48…
…カム軸、49……カム。FIG. 1 is a partial plan view of a cylinder head showing one embodiment of the present invention, FIG. 2 is a sectional view taken along the line II of FIG. 1, and FIG. 3 is a part of FIG. FIG. 4 is an explanatory sectional view of a conventional assembly state. 1,41 ... Cylinder head, 2 ... Bearing, 3,42 ... Lifter bore, 4 ... Notch, 5,50 ... Oil jacket, 8 ... Water jacket, 43 ... Valve stem, 44 ... Coil spring, 46 ... Lifter, 48 ...
… Cam shaft, 49… Cam.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 実開 昭60−170005（ＪＰ，Ｕ) 実開 昭60−153815（ＪＰ，Ｕ) 実開 平３−51106（ＪＰ，Ｕ) 実開 平２−13105（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) F02F 1/24 F01L 1/26 F01L 1/14──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-60-170005 (JP, U) JP-A-60-153815 (JP, U) JP-A 3-51106 (JP, U) JP-A 2- 13105 (JP, U) (58) Field surveyed (Int. Cl. 6 , DB name) F02F 1/24 F01L 1/26 F01L 1/14
Claims (1)
つの排気バルブを備えた内燃機関のシリンダヘッドにお
いて、カム軸の回転により上下動する吸排気バルブステ
ム上端のリフタを摺動自在に挿嵌するリフタボア下端部
の前記カム軸方向側に切欠部を形成したことを特徴とす
るシリンダヘッドのリフタボア構造。In a cylinder head of an internal combustion engine provided with two intake valves and two exhaust valves for one cylinder, a lifter at an upper end of an intake / exhaust valve stem which moves up and down by rotation of a cam shaft is slidable. A lifter structure for a cylinder head, wherein a cutout portion is formed at a lower end portion of the lifter bore to be inserted in the cam shaft direction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19293190A JP2841307B2 (en) | 1990-07-23 | 1990-07-23 | Lifter bore structure of cylinder head |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19293190A JP2841307B2 (en) | 1990-07-23 | 1990-07-23 | Lifter bore structure of cylinder head |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04209906A JPH04209906A (en) | 1992-07-31 |
| JP2841307B2 true JP2841307B2 (en) | 1998-12-24 |
Family
ID=16299380
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19293190A Expired - Fee Related JP2841307B2 (en) | 1990-07-23 | 1990-07-23 | Lifter bore structure of cylinder head |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2841307B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004060910B4 (en) | 2003-12-17 | 2014-10-16 | Mitsubishi Jidosha Kogyo K.K. | tappet guide |
-
1990
- 1990-07-23 JP JP19293190A patent/JP2841307B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102004060910B4 (en) | 2003-12-17 | 2014-10-16 | Mitsubishi Jidosha Kogyo K.K. | tappet guide |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04209906A (en) | 1992-07-31 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |