JPS59229258A - Core for hollow cam shaft consisting of cast iron - Google Patents

Core for hollow cam shaft consisting of cast iron

Info

Publication number
JPS59229258A
JPS59229258A JP10363383A JP10363383A JPS59229258A JP S59229258 A JPS59229258 A JP S59229258A JP 10363383 A JP10363383 A JP 10363383A JP 10363383 A JP10363383 A JP 10363383A JP S59229258 A JPS59229258 A JP S59229258A
Authority
JP
Japan
Prior art keywords
core
cores
cast iron
cam shaft
branch
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
Application number
JP10363383A
Other languages
Japanese (ja)
Inventor
Shiro Kitabayashi
北林　史郎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Suzuki Motor Corp
Original Assignee
Suzuki Motor Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Suzuki Motor Corp filed Critical Suzuki Motor Corp
Priority to JP10363383A priority Critical patent/JPS59229258A/en
Publication of JPS59229258A publication Critical patent/JPS59229258A/en
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22C—FOUNDRY MOULDING
    • B22C9/00—Moulds or cores; Moulding processes
    • B22C9/10—Cores; Manufacture or installation of cores

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Molds, Cores, And Manufacturing Methods Thereof (AREA)

Abstract

PURPOSE:To form a cam shaft having a large hollow part and to reduce the weight thereof by projecting radially branch cores from a core body and disposing longitudinally plural pieces of such branch cores. CONSTITUTION:Branch cores 5 are so formed as to project radially from the lateral circumferential surface 7 of a core body 6 and plural pieces of such cores 5 are disposed to the longitudinal direction of the core body 6, thereby constituting a core 4. Since the cores 5 are used as a core print in the stage of casting a hollow cam shaft 8 consisting of a cast iron by using such core 4, the supporting of the core 4 is easy and the venting of the gas is also made easy by the cores 5. Open holes 13 formed by the cores 5 after casting of the cam shaft 9 is used for stripping sand from the core 4.

Description

【発明の詳細な説明】 本発明は、鋳鉄中空カムシャフト用の中子に関するもの
である。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a core for a cast iron hollow camshaft.

従来、鋳鉄カムシャフトに中空部を設ける方法として、
これをドリル加工によって穿孔する方法、あるいはパイ
プ鋳ぐるみによる方法などが一般に用いられている。し
かし、ドリル加工による方法は、第１図に示すように、
カムシャフト１に形成するドリル孔２の寸法が長いため
、使用するドリルの寸法も長くなシ、片持ちで保持され
るドリルのセンタはズレやすくなる。そのため、ドリル
の径を大きくすると、ドリルセンタのズレの大きさによ
っては、カムシャフト１の側周面３を穿孔するおそれが
あシ、大きなドリル孔２を穿孔することができなかった
。また、パイプ鋳ぐるみによる方法は、強度、湯口シ等
により決定されるカムシャフトの最低肉厚にパイプの肉
厚が加わるため、大きな中空部を形成することができな
かった。他方、直径の大きい中子を用いて、鋳鉄カムシ
ャフトに中空部を形成する方法は、中子支持の問題から
行なわれていなかった。Conventionally, as a method of providing a hollow part in a cast iron camshaft,
A method of perforating this by drilling or a method of using pipe casting are generally used. However, the drilling method, as shown in Figure 1,
Since the drill hole 2 formed in the camshaft 1 is long, the drill used is also long, and the center of the drill, which is held in a cantilevered manner, is likely to shift. Therefore, if the diameter of the drill is increased, there is a risk of drilling the side peripheral surface 3 of the camshaft 1 depending on the size of the deviation of the drill center, making it impossible to drill a large drill hole 2. In addition, in the pipe casting method, the wall thickness of the pipe is added to the minimum wall thickness of the camshaft determined by the strength, sprue, etc., so that it is not possible to form a large hollow part. On the other hand, a method of forming a hollow part in a cast iron camshaft using a core with a large diameter has not been carried out due to problems in supporting the core.

本発明は、上記問題点を解消する鋳鉄中空カムシャフト
用の中子を提供することを目的とし、その特徴とすると
ころは、中子本体から半径方向に突出した枝中子を複数
個長手方向に配設したことにある。The present invention aims to provide a core for cast iron hollow camshafts that solves the above-mentioned problems, and is characterized by having a plurality of branch cores protruding in the radial direction from the core body in the longitudinal direction. This is because it was placed in

以下、図示実施例に基づき本発明を説明する。The present invention will be explained below based on illustrated embodiments.

第２図および第３図は、本発明の１実施例を示したもの
で、図において、４は中子、５は枝中子でちる。枝中子
５は、中子本体６の側周面７から半径方向に突出して形
成されている。中子４は、上記枝中子５を複数個中子本
体６の長手方向に配設してなる。第３図は、該中子４を
用いて成形した鋳鉄中空カムシャフト８を示したもので
、図中、９はシャフト、１０はカム、１１はジャーナル
、１２は中空部、１３は開放孔である。2 and 3 show one embodiment of the present invention, in which 4 is a core and 5 is a branch core. The branch core 5 is formed to protrude in the radial direction from the side peripheral surface 7 of the core body 6. The core 4 is formed by arranging a plurality of the branch cores 5 in the longitudinal direction of the core body 6. FIG. 3 shows a cast iron hollow camshaft 8 formed using the core 4. In the figure, 9 is a shaft, 10 is a cam, 11 is a journal, 12 is a hollow part, and 13 is an open hole. be.

中空部１２は中子本体６を、また、開放孔１３は枝中子
５を砂落しして、形成したものでおる。The hollow portion 12 is formed by removing sand from the core body 6, and the open hole 13 is formed by removing sand from the branch core 5.

上記構成の中子４を用いて鋳鉄中空カムシャフト８を鋳
造する際、枝中子５を中本として利用するので、中子支
持が容易となる。また、枝中子５によシガス抜きも容易
となる。上記カムシャフト８を鋳造したのち、枝中子５
によって形成された開放孔１３は、中子４の砂落しに使
用する。When the cast iron hollow camshaft 8 is cast using the core 4 having the above structure, the branch core 5 is used as a core, making it easy to support the core. Further, the branch core 5 also facilitates removal of the gas. After casting the above camshaft 8, the branch core 5
The open hole 13 formed by this is used for removing sand from the core 4.

本発明に係る中子を用いて鋳鉄中空カムシャフトを鋳造
すれば、中子支持が容易になるので、直径の大きい中子
を使用できる。その結果、上記カムシャフトに大きな中
空部を設けることができ、カムシャフトの大巾な軽量化
が図れる。If a cast iron hollow camshaft is cast using the core according to the present invention, the core can be easily supported, so a core with a large diameter can be used. As a result, a large hollow portion can be provided in the camshaft, and the weight of the camshaft can be significantly reduced.

また、中子を砂落ししたのち、枝中子の部分は開放孔と
なるので、エンジンのオイル通路およびカムシャフト端
部にプーリポルトを締め付ける際にｍｂ止めとして使用
できる。In addition, after removing sand from the core, the branch core portion becomes an open hole, so it can be used as an MB stopper when tightening a pulley port to the engine oil passage and camshaft end.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来の鋳鉄中空カムシャフトを示す正面図、第
２図は本発明の１実施例に係る鋳鉄中空カムシャフト用
の中子を示す正面図、第３図は上記中子を用いて鋳造し
た鋳鉄中空カムシャフトを示す正面図である。 ４・・・・・・中子、　　　　５・・・・・・枝中子、
６・・・・・・中子本体、 ８・・・・・・鋳鉄中空カムシャフト。Fig. 1 is a front view showing a conventional cast iron hollow camshaft, Fig. 2 is a front view showing a core for a cast iron hollow camshaft according to an embodiment of the present invention, and Fig. 3 is a front view showing a core for a cast iron hollow camshaft according to an embodiment of the present invention. FIG. 2 is a front view showing a cast iron hollow camshaft. 4... Core, 5... Branch core,
6... Core body, 8... Cast iron hollow camshaft.

Claims (1)

【特許請求の範囲】[Claims] 中子本体から半径方向に突出した枝中子を複数個長手方
向に配設したことを特徴とする鋳鉄中空カムシャフト用
の中子。A core for a cast iron hollow camshaft, characterized in that a plurality of branch cores protruding radially from a core body are arranged in the longitudinal direction.
JP10363383A 1983-06-10 1983-06-10 Core for hollow cam shaft consisting of cast iron Pending JPS59229258A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10363383A JPS59229258A (en) 1983-06-10 1983-06-10 Core for hollow cam shaft consisting of cast iron

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10363383A JPS59229258A (en) 1983-06-10 1983-06-10 Core for hollow cam shaft consisting of cast iron

Publications (1)

Publication Number Publication Date
JPS59229258A true JPS59229258A (en) 1984-12-22

Family

ID=14359171

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10363383A Pending JPS59229258A (en) 1983-06-10 1983-06-10 Core for hollow cam shaft consisting of cast iron

Country Status (1)

Country Link
JP (1) JPS59229258A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005099933A1 (en) * 2004-04-16 2005-10-27 Kabushiki Kaisha Riken Cast hollow crankshaft and method of manufacturing the same
WO2020121557A1 (en) * 2018-12-13 2020-06-18 西岡可鍛工業株式会社 Method for producing shaft, and casting mold assembly

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56117861A (en) * 1980-02-18 1981-09-16 Toyota Motor Corp Casting method of hollow cam shaft

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS56117861A (en) * 1980-02-18 1981-09-16 Toyota Motor Corp Casting method of hollow cam shaft

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005099933A1 (en) * 2004-04-16 2005-10-27 Kabushiki Kaisha Riken Cast hollow crankshaft and method of manufacturing the same
KR100837941B1 (en) 2004-04-16 2008-06-13 가부시끼가이샤 리켄 Cast hollow crankshaft and method of manufacturing the same
WO2020121557A1 (en) * 2018-12-13 2020-06-18 西岡可鍛工業株式会社 Method for producing shaft, and casting mold assembly
CN113165055A (en) * 2018-12-13 2021-07-23 西冈可锻工业株式会社 Method for producing a shaft and mould assembly

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