JPH0442482Y2 - - Google Patents
Info
- Publication number
- JPH0442482Y2 JPH0442482Y2 JP16988386U JP16988386U JPH0442482Y2 JP H0442482 Y2 JPH0442482 Y2 JP H0442482Y2 JP 16988386 U JP16988386 U JP 16988386U JP 16988386 U JP16988386 U JP 16988386U JP H0442482 Y2 JPH0442482 Y2 JP H0442482Y2
- Authority
- JP
- Japan
- Prior art keywords
- camshaft
- core tube
- core
- cast
- section
- 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
Links
- 229910001018 Cast iron Inorganic materials 0.000 description 9
- 238000005266 casting Methods 0.000 description 6
- 229910000831 Steel Inorganic materials 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 229910052751 metal Inorganic materials 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Valve-Gear Or Valve Arrangements (AREA)
- Gears, Cams (AREA)
Description
【考案の詳細な説明】
〔産業上の利用分野〕
この考案は、四サイクルエンジンのカムシヤフ
トに関する。[Detailed Description of the Invention] [Industrial Application Field] This invention relates to a camshaft for a four-stroke engine.
四サイクルエンジンは、シリンダーヘツドにカ
ムシヤフトを軸架してクランクシヤフトに連動さ
せて回転させ、カムシヤフトのカムの回転によつ
て吸気弁及び排気弁をバネに抗して押下げて開く
ようにしている。カムシヤフトは軽量化のために
芯に合せて芯孔を切削加工して設けているが、多
気筒でカムシヤフトが長くなると、芯孔の切削加
工が面倒で高価につく。このため、鋳鉄で鋳造す
るカムシヤフトの芯に合せて鋼管の中子を配置し
て鋳込むことにより、鋼管の芯孔を設けるように
したものがある。例えば実公昭50−38648号公報
参照。このようにすれば、芯孔の切削加工が省け
て安価にできる。ところが、鋳造の際湯口の位置
によつて、カムシヤフトの冷える早さが異なり、
熱変形してカムシヤフトが曲がつてできる不都合
があり、カムシヤフトの切削仕上げによる切削代
を多くしておかなければならず不経済である。
In a four-stroke engine, a camshaft is mounted on the cylinder head and rotated in conjunction with the crankshaft, and the rotation of the cam of the camshaft pushes down the intake and exhaust valves against a spring to open them. . The camshaft has a core hole cut to match the core to reduce weight, but when the camshaft is long with multiple cylinders, cutting the core hole is troublesome and expensive. For this reason, some camshafts are cast with cast iron, and a core hole of the steel pipe is provided by placing a core of the steel pipe in alignment with the core of the camshaft and casting the core. For example, see Utility Model Publication No. 50-38648. In this way, cutting of the core hole can be omitted and the cost can be reduced. However, the speed at which the camshaft cools down depends on the location of the sprue during casting.
There is a disadvantage that the camshaft is bent due to thermal deformation, and the cutting allowance for finishing the camshaft must be increased, which is uneconomical.
この考案は、中子管を鋳込んで鋳造するカムシ
ヤフトで、中子管が抜けることがなく、かつ鋳造
したカムシヤフトが曲がらないような四サイクル
エンジンのカムシヤフトを得ることを目的とす
る。
The purpose of this invention is to obtain a camshaft for a four-cycle engine in which the core tube is cast by casting, and the core tube does not fall out and the cast camshaft does not bend.
以下、本考案を図面に示す実施例によつて説明
する。
The present invention will be explained below with reference to embodiments shown in the drawings.
シヤフト１は鋼管の中子管２を鋳鉄で鋳込んで
形成されているものである。中子管２は、両端部
３を細径円形の断面に絞り加工されると共に、両
端部３の間（中央部）を長円形又は楕円形の偏平
な断面に加圧加工されている。 The shaft 1 is formed by casting a core tube 2 of a steel pipe with cast iron. The core tube 2 has both ends 3 drawn to have a small-diameter circular cross section, and the space between the both ends 3 (the center portion) is pressurized to have an oval or elliptical flat cross section.
そして、中子管２は、中央部における長径方向
を鋳鉄の湯口４と同一方向にして、即ち鋳造のカ
ムシヤフト１の中央部に形成される顎部５の一側
と長径方向とを一致させた状態で鋳込まれている
ものである。 The core tube 2 has its major axis in the center aligned in the same direction as the cast iron sprue 4, that is, the major axis coincides with one side of the jaw 5 formed in the central part of the casting camshaft 1. It is cast in the state.
カムシヤフト１を鋳造する場合、鋳型に中子管
２をセツトし、湯口４から鋳鉄湯を注入して、中
子管２を鋳込んで、カムシヤフト１を鋳造する。
湯口４は、カムシヤフト１の中央に設けた鍔部５
の上側に設けてあるので、注湯した鋳鉄湯は、下
側が早く冷え、上側の冷えが遅れる。しかし、中
子管２の偏平にした長径方向が湯口４の向きに合
せてあるので、中子管２は上下方向に剛性が高
く、曲がり難く、カムシヤフト１が曲がつてでき
るのを防げる。又、中子管２は、両端部３を細径
円形の断面にしてあるので、抜け出すこともな
い。
When casting the camshaft 1, the core tube 2 is set in a mold, cast iron molten metal is poured from the sprue 4, the core tube 2 is cast, and the camshaft 1 is cast.
The sprue 4 is connected to a flange 5 provided at the center of the camshaft 1.
Since the cast iron molten metal is placed on the upper side, the lower side cools down faster, and the upper side cools down more slowly. However, since the long diameter direction of the flattened core tube 2 is aligned with the direction of the sprue 4, the core tube 2 has high rigidity in the vertical direction and is difficult to bend, thereby preventing the camshaft 1 from being bent. Further, since both ends 3 of the core tube 2 have a circular cross section with a small diameter, the core tube 2 will not fall out.
以上説明したように、この考案は、長円形又は
楕円形の断面を有する中央部と、該中央部の両端
より延設されて細径円形の断面を有する端部とか
らなる中子管が、中央部における長径方向を鋳鉄
の湯口方向にして鋳込まれているので、鋳鉄湯の
冷える早さが異なる上下方向に、中子管の剛性の
高い長径方向が向けられていて、鋳鉄湯の冷え早
さの違いによるカムシヤフトの曲がりを防ぐこと
ができる。このため、カムシヤフトの切削仕上代
を少なくできて、安価になる。又、中子管は、両
端部が細径円形の断面にしてあるので、鋳型への
セツトが容易で、鋳鉄湯との結合不足で抜けてく
ることもない。
As explained above, this invention provides a core tube consisting of a central portion having an oval or elliptical cross section and end portions extending from both ends of the central portion and having a small diameter circular cross section. Since the long diameter direction of the central part is directed toward the sprue of the cast iron, the long diameter direction of the core tube with high rigidity is oriented in the vertical direction where the speed of cooling of the cast iron water differs, and the long diameter direction of the core tube is oriented toward the top and bottom directions, where the speed of cooling of the cast iron water is different. This prevents the camshaft from bending due to differences in speed. Therefore, the cutting allowance for the camshaft can be reduced and the cost can be reduced. In addition, since both ends of the core tube have a circular cross section with a small diameter, it is easy to set the core tube into the mold, and there is no chance of it falling out due to insufficient bonding with the cast iron molten metal.
図は本考案の一実施例を示し、第１図は縦断正
面図、第２図は端面図、第３図は第１図Ａ−Ａ矢
視横断面図である。
１……カムシヤフト、２……中子管、３……端
部、４……湯口。
The drawings show one embodiment of the present invention, in which FIG. 1 is a vertical front view, FIG. 2 is an end view, and FIG. 3 is a cross-sectional view taken along the line A--A in FIG. 1... camshaft, 2... core tube, 3... end, 4... sprue.
Claims (1)
中央部の両端より延設されて細径円形の断面を有
する端部とからなる中子管が、中央部における長
径方向を鋳鉄の湯口方向にして鋳込まれているこ
とを特徴とする四サイクルエンジンのカムシヤフ
ト。 A core tube consists of a central part having an oval or elliptical cross-section and end parts extending from both ends of the central part and having a small-diameter circular cross-section. A four-stroke engine camshaft characterized by being cast in
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16988386U JPH0442482Y2 (en) | 1986-11-05 | 1986-11-05 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16988386U JPH0442482Y2 (en) | 1986-11-05 | 1986-11-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6375504U JPS6375504U (en) | 1988-05-19 |
| JPH0442482Y2 true JPH0442482Y2 (en) | 1992-10-07 |
Family
ID=31104097
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16988386U Expired JPH0442482Y2 (en) | 1986-11-05 | 1986-11-05 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0442482Y2 (en) |
-
1986
- 1986-11-05 JP JP16988386U patent/JPH0442482Y2/ja not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6375504U (en) | 1988-05-19 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0442482Y2 (en) | ||
| US4922863A (en) | Cast engine cylinder having an internal passageway and method of making same | |
| JP2534534Y2 (en) | Engine crankshaft bearing structure | |
| JP2521375Y2 (en) | Cylinder head of internal combustion engine | |
| JPH10213051A (en) | Clamp structure of fuel injection nozzle | |
| JPS6137787Y2 (en) | ||
| JPH0133804Y2 (en) | ||
| JPH0640892Y2 (en) | Cylinder head oil sump structure | |
| JPH0791967B2 (en) | Valve system for multi-cylinder four-cycle engine | |
| JP2526131Y2 (en) | OHC type engine cylinder head | |
| JPS633363Y2 (en) | ||
| JPH0748994Y2 (en) | Two-cycle engine cylinder | |
| JPH0471713U (en) | ||
| JPH0359409U (en) | ||
| JPS5849397Y2 (en) | internal combustion engine cylinder head | |
| JPH0317245U (en) | ||
| JPS60167103U (en) | Camshaft support structure for multi-valve internal combustion engine | |
| JPH08508Y2 (en) | Engine cylinder head structure | |
| JPH03130911U (en) | ||
| JPS648509U (en) | ||
| JPH04123308U (en) | Camshaft stopper device in valve train of overhead cam type engine | |
| JPS5842309U (en) | camshaft | |
| JPH0387903U (en) | ||
| JPS59163105U (en) | Internal combustion engine valve lifter | |
| JPS6158657U (en) |