JPS623109A - Cam shaft holder of internal-combustion engine - Google Patents
Cam shaft holder of internal-combustion engineInfo
- Publication number
- JPS623109A JPS623109A JP60140136A JP14013685A JPS623109A JP S623109 A JPS623109 A JP S623109A JP 60140136 A JP60140136 A JP 60140136A JP 14013685 A JP14013685 A JP 14013685A JP S623109 A JPS623109 A JP S623109A
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- cylinder head
- holder
- combustion engine
- end surface
- 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.)
- Pending
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01L—CYCLICALLY OPERATING VALVES FOR MACHINES OR ENGINES
- F01L1/00—Valve-gear or valve arrangements, e.g. lift-valve gear
- F01L1/02—Valve drive
- F01L1/04—Valve drive by means of cams, camshafts, cam discs, eccentrics or the like
- F01L1/047—Camshafts
- F01L2001/0476—Camshaft bearings
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるた
め要約のデータは記録されません。(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、非分割型構造とした内燃エンジンのカムシャ
フトホルダに関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a camshaft holder for an internal combustion engine having a non-divided construction.
（従来技術及びその問題点）
従来技術によるカムシャフトホルダ１は第１図に示すよ
うにシリンダヘッド２の上端面２ａに半円状凹部２ｂを
設けると共に、該凹部２ｂと対応合致する半円状凹部３
ａを設けたカムシャフトホルダ本体３を前記シリンダヘ
ッド２の上端面にボルト４にて固定することにより構成
される。(Prior art and its problems) As shown in FIG. 1, the camshaft holder 1 according to the prior art is provided with a semicircular recess 2b on the upper end surface 2a of the cylinder head 2, and a semicircular recess 2b that corresponds to and coincides with the recess 2b. Recess 3
It is constructed by fixing the camshaft holder main body 3 provided with the camshaft holder body 3 to the upper end surface of the cylinder head 2 with bolts 4.
多気筒内燃エンジンの場合には、カムシャフトホルダ１
も多数必要となり（例えばカムシャフト１本に対してカ
ムシャフトホルダが４個）、シリンダヘッド２及びホル
ダ本体３は、通常鋳物にて製作されるから夫々略半円状
凹部を別体にて加工し、シリンダヘッド２の上端面２ａ
に半円状凹部３ａを持つホルダ本体３を組付ける。この
時シリンダヘッド２の上端面２ａがカムシャフトの中心
と同レベルであるため、ロッカアーム、アジャストスク
リューのメンテナンスがやりにくいなどの不都合が生じ
ている。また、この摩擦損失を防ぐ
“、・′パため玉軸受などを使用する場合も考えられる
が、 、・。In the case of a multi-cylinder internal combustion engine, the camshaft holder 1
A large number of camshaft holders are required (for example, four camshaft holders for one camshaft), and since the cylinder head 2 and holder body 3 are usually manufactured by casting, the roughly semicircular recesses for each are machined separately. The upper end surface 2a of the cylinder head 2
A holder main body 3 having a semicircular recess 3a is assembled to the holder body 3. At this time, the upper end surface 2a of the cylinder head 2 is at the same level as the center of the camshaft, which causes problems such as difficulty in maintaining the rocker arm and the adjustment screw. It also prevents this friction loss.
``,・'Although it is possible to use a ball bearing for protection, ,・.
締付はボルト軸力の変動により玉軸受をレモン状にして
しまうため摩擦損失が発生する。Tightening causes friction loss because the ball bearing becomes lemon-shaped due to fluctuations in bolt axial force.
（発明の目的）
本発明は上記事情に鑑みてなされたもので、高速回転と
なっても摩擦損失が少なく、高精度で、しかも加工工程
が少なく、さらにシリンダヘッド部のメンテナンスがや
り易い、コンパクトな構造となる内燃エンジンのカムシ
ャフトホルダを提供 ２〜することに
ある。(Objective of the Invention) The present invention has been made in view of the above circumstances, and is compact, with low friction loss even at high speed rotation, high precision, fewer machining steps, and easy maintenance of the cylinder head. An object of the present invention is to provide a camshaft holder for an internal combustion engine having a structure.
（問題点を解決するための手段）
前記問題点を解決するため本発明においては、シリンダ
ヘッド上端面に取り付けられるカムシャフトホルダ本体
にカムシャフト嵌合用の円形嵌合孔を穿設してなること
を特徴とするものである。(Means for Solving the Problems) In order to solve the above problems, in the present invention, a circular fitting hole for fitting the camshaft is formed in the camshaft holder main body attached to the upper end surface of the cylinder head. It is characterized by:
（実施例） 以下本発明の一実施例を図面に基づき詳述する。(Example) An embodiment of the present invention will be described in detail below based on the drawings.
カムシャフトホルダ９は第２図に示すように内燃エンジ
ン１１のシリンダヘッド１２の上端面１２ａ上に別体に
て形成される。カムシャフトホルダ９はシリンダヘッド
１２に対して完全に独立した単体構造で第３図に示すよ
うにカムシャフトホルダ本体１０内に玉軸受１３の外輪
１３ａが圧入嵌着され、該玉軸受１３の内軸１３ｂはカ
ムシャフト１４の外周に嵌合固定される。したがって、
該カムシャフト１４は自由にカムシャフトホルダ９内に
おいて回転可能となる。前記ホルダ本体１０の両端には
ボルト孔１０ｃ、１０ｄが穿設され、該ボルト孔１０ｃ
、１０ｄに嵌挿したボルト１７゜１８にてホルダ本体１
０がシリンダヘッド１２の上端面１２ａに強固に固着さ
れる。シリンダヘッド１２の上端面１２ａと接触する前
記ホルダ本体１０の下端面１０ｂは、前記嵌合孔１０ａ
及びカムシャフト１４の芯出しの基準面となる。The camshaft holder 9 is formed separately on the upper end surface 12a of the cylinder head 12 of the internal combustion engine 11, as shown in FIG. The camshaft holder 9 has a single unit structure that is completely independent of the cylinder head 12. As shown in FIG. The shaft 13b is fitted and fixed to the outer periphery of the camshaft 14. therefore,
The camshaft 14 is freely rotatable within the camshaft holder 9. Bolt holes 10c and 10d are bored at both ends of the holder body 10, and the bolt holes 10c and
, holder body 1 with bolts 17°18 inserted in 10d.
0 is firmly fixed to the upper end surface 12a of the cylinder head 12. The lower end surface 10b of the holder main body 10 that contacts the upper end surface 12a of the cylinder head 12 has the fitting hole 10a.
and serves as a reference surface for centering the camshaft 14.
上述のようにカムシャフトホルダ９はシリンダヘッド１
２の上端面に取り付けられるホルダ本体１ｏに、カムシ
ャフト嵌合用円形嵌合孔１０ａを穿設してなるから、該
嵌合孔に装着されるカムシャフト１４はシリンダヘッド
１２の上端１２ａよりも上部に位置する（第２図及び第
３図参照）。As mentioned above, the camshaft holder 9 is attached to the cylinder head 1.
A circular fitting hole 10a for fitting a camshaft is formed in the holder main body 1o attached to the upper end surface of the cylinder head 12, so that the camshaft 14 attached to the fitting hole is located above the upper end 12a of the cylinder head 12. (See Figures 2 and 3).
なお、第２図中１１は内燃エンジンで、そのシリンダブ
ロック２０内のシリンダバレル２１内にはピストン２２
が摺嵌しである。前記シリンダブロック２０の上部に載
設したシリンダヘッド１２には燃焼室２３に連通ずる吸
気通路２４と排気通路２５が設けてあり、吸気通路２４
にはキャブレタ（図示せず）が排気通路２５には排気管
（図示せず）がそれぞれ接続しである。前記吸気通路２
４と燃焼室２３との連通部（吸気口）は互いに並設した
２つの吸気弁２６（１つのみ図示）により開閉され、ま
た前記排気通路２５と燃焼室２３との連通部（排気口）
も互いに並設した２つの排気弁２７（１つのみ図示）に
より開閉される。In addition, 11 in FIG. 2 is an internal combustion engine, and a piston 22 is installed in the cylinder barrel 21 in the cylinder block 20.
is a slip fit. The cylinder head 12 mounted on the upper part of the cylinder block 20 is provided with an intake passage 24 and an exhaust passage 25 that communicate with a combustion chamber 23.
A carburetor (not shown) is connected to the exhaust passage 25, and an exhaust pipe (not shown) is connected to the exhaust passage 25. The intake passage 2
A communication section (intake port) between the exhaust passage 25 and the combustion chamber 23 is opened and closed by two intake valves 26 (only one shown) arranged in parallel with each other, and a communication section (exhaust port) between the exhaust passage 25 and the combustion chamber 23 is opened and closed by two intake valves 26 (only one shown).
The exhaust valves 27 are also opened and closed by two exhaust valves 27 (only one shown) arranged in parallel with each other.
これら各２つの吸気弁２６及び排気弁２７は動弁装置２
８，２９によりそれぞれ開閉される。These two intake valves 26 and exhaust valves 27 are connected to the valve train 2.
8 and 29, respectively.
動弁装置２８．２９にはシャフト１４のカム３０から係
合し、該カムシャフト１４のギヤ３１（第４図参照）を
介して該カムシャフト１４に内燃エンジン１１のクラン
ク軸（図示せず）からの回転が伝導され、前記カム３０
により動弁装置２８゜２９のスリッパ３２、ロッカアー
ム３３を介して吸気弁２６及び排気弁２７の開閉が行わ
れる。多気筒内燃工゛ンジンの場合には前記カムシャフ
ト１４は、第４図に示すように、例えばカムシャフトホ
ルダ９ａ、９ｂ、９ｃ、９ｄによってシリンダヘッド１
２上に支持される。該カムシャフト１４は３分割とされ
、スプロケットが一体形成されている第１のカムシャフ
ト部材１４ａ、両側のカム３２が一体形成されている第
２．第３のカムシャフト部材１４ｂ、１４ｃとによって
構成されている。A cam 30 of the shaft 14 engages with the valve train 28, 29, and a crankshaft (not shown) of the internal combustion engine 11 is connected to the camshaft 14 via a gear 31 of the camshaft 14 (see FIG. 4). The rotation from the cam 30 is transmitted to the cam 30.
Accordingly, the intake valve 26 and the exhaust valve 27 are opened and closed via the slipper 32 and rocker arm 33 of the valve train 28 and 29. In the case of a multi-cylinder internal combustion engine, the camshaft 14 is connected to the cylinder head 1 by, for example, camshaft holders 9a, 9b, 9c, and 9d, as shown in FIG.
2. The camshaft 14 is divided into three parts: a first camshaft member 14a on which sprockets are integrally formed, and a second camshaft member 14a on which cams 32 on both sides are integrally formed. It is constituted by third camshaft members 14b and 14c.
（作用）、、１
カムシャフトホルダ９をシリンダヘッド１２の上端面１
２ａ上に立設する場合、カムシャフト１４が本実施例の
場合３分割とされているため、第２
′のカムシャフト部材１４ｂにカムシャフトホルダ
９ｂを挿入固定し、同様に第３のカムシャフト部材１４
ｃにカムシャフトホルダ９ｃを挿入固定し、しかる後、
第１のカムシャフト部材１４ａに第２゜第３のカムシャ
フト部材を圧入嵌着する０次にカムシャフトホルダ９ａ
、９ｄをカムシャフト１４ ：
：の両端に挿入する上述の状態でカムシャフトホル
、。(Function), 1 Place the camshaft holder 9 on the upper end surface 1 of the cylinder head 12.
2a, since the camshaft 14 is divided into three parts in this embodiment, the second
The camshaft holder 9b is inserted and fixed into the third camshaft member 14b, and the third camshaft member 14 is similarly inserted and fixed.
Insert and fix the camshaft holder 9c into c, and then
A zero-order camshaft holder 9a that press-fits the second and third camshaft members into the first camshaft member 14a.
,9d to camshaft 14:
:Insert the camshaft holder into both ends of the
,.
ダ９ａ〜９ｄをシリンダヘッド１２の上端面１２ａ上に
立設することにより第４図に示す如く複数のカムシャフ
トホルダ９ａ〜９ｄを介してカムシャフト１４がシリン
ダヘッド１２の上方に回転自在に支持される。As shown in FIG. 4, the camshaft 14 is rotatably supported above the cylinder head 12 via the plurality of camshaft holders 9a to 9d, as shown in FIG. be done.
（発明の効果）
以上詳述した如く、本発明のカムシャフトホルダは、シ
リンダヘッド上端面に取り付けられるカムシャフトホル
ダ本体にカムシャフト嵌合用の円形嵌合孔を穿設してな
ることを特徴とするものである。(Effects of the Invention) As detailed above, the camshaft holder of the present invention is characterized in that a circular fitting hole for fitting the camshaft is formed in the camshaft holder main body attached to the upper end surface of the cylinder head. It is something to do.
従って１本発明のカムシャフトホルダは加工工程が少な
く、芯出し加工が精度よく容易に行え、しかも高精度で
あるため、内燃エンジンが高速回転となっても摩擦損失
が少なく、シリンダヘッド部のメンテナンスが容易で軽
量コンパクトな構造とすることができるなどの利点があ
る。Therefore, the camshaft holder of the present invention requires fewer machining steps, allows easy centering with high accuracy, and is highly accurate, so even when the internal combustion engine rotates at high speed, there is little friction loss, and maintenance of the cylinder head is possible. It has the advantages of being easy to use and having a lightweight and compact structure.
第１図は、従来技術のカムシャフトホルダの側面図、第
２図は、本発明のカムシャフトホルダの一実施例のシリ
ンダヘッド上端面への組付図、第３図は本発明のカムシ
ャフトホルダの一実施例を示す側面図、第４図は一部を
省略した第２図の■−■横断面図である。
９・・・カムシャフト、１０・・・カムシャフトホルダ
本体、１０ａ・・・円形嵌合孔、１１・・−内燃エンジ
ン、１２ａ・・・シリンダヘッド上端面、１４・・・カ
ムシャフト。FIG. 1 is a side view of a conventional camshaft holder, FIG. 2 is an assembly diagram of an embodiment of the camshaft holder of the present invention on the upper end surface of a cylinder head, and FIG. 3 is a camshaft holder of the present invention. FIG. 4 is a side view showing one embodiment of the present invention, and FIG. 4 is a partially omitted cross-sectional view taken along the line ■-■ of FIG. 9...Camshaft, 10...Camshaft holder main body, 10a...Circular fitting hole, 11...-Internal combustion engine, 12a...Cylinder head upper end surface, 14...Camshaft.
Claims (1)
トホルダ本体にカムシャフト嵌合用の円形嵌合孔を穿設
してなることを特徴とする内燃エンジンのカムシャフト
ホルダ。1. A camshaft holder for an internal combustion engine, characterized in that a circular fitting hole for fitting the camshaft is formed in the camshaft holder body attached to the upper end surface of the cylinder head.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140136A JPS623109A (en) | 1985-06-28 | 1985-06-28 | Cam shaft holder of internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60140136A JPS623109A (en) | 1985-06-28 | 1985-06-28 | Cam shaft holder of internal-combustion engine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS623109A true JPS623109A (en) | 1987-01-09 |
Family
ID=15261718
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60140136A Pending JPS623109A (en) | 1985-06-28 | 1985-06-28 | Cam shaft holder of internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS623109A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008202581A (en) * | 2007-02-22 | 2008-09-04 | Mitsubishi Motors Corp | Valve mechanism of internal combustion engine |
| JP2010156211A (en) * | 2008-12-26 | 2010-07-15 | Jtekt Corp | Camshaft device mounting structure |
-
1985
- 1985-06-28 JP JP60140136A patent/JPS623109A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008202581A (en) * | 2007-02-22 | 2008-09-04 | Mitsubishi Motors Corp | Valve mechanism of internal combustion engine |
| JP2010156211A (en) * | 2008-12-26 | 2010-07-15 | Jtekt Corp | Camshaft device mounting structure |
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