JP2005114131A - Crank shaft blank material for multi-cylinder engine - Google Patents

Crank shaft blank material for multi-cylinder engine Download PDF

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Publication number
JP2005114131A
JP2005114131A JP2003352328A JP2003352328A JP2005114131A JP 2005114131 A JP2005114131 A JP 2005114131A JP 2003352328 A JP2003352328 A JP 2003352328A JP 2003352328 A JP2003352328 A JP 2003352328A JP 2005114131 A JP2005114131 A JP 2005114131A
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JP
Japan
Prior art keywords
die
arm
cutting direction
crank shaft
journal
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Granted
Application number
JP2003352328A
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Japanese (ja)
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JP4167161B2 (en
Inventor
Yukihiro Fujioka
幸博 藤岡
Masaru Kizaki
優 木崎
Nobuhisa Fujino
伸久 藤野
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Hino Motors Ltd
Nippon Steel Corp
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Hino Motors Ltd
Sumitomo Metal Industries Ltd
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Application filed by Hino Motors Ltd, Sumitomo Metal Industries Ltd filed Critical Hino Motors Ltd
Priority to JP2003352328A priority Critical patent/JP4167161B2/en
Publication of JP2005114131A publication Critical patent/JP2005114131A/en
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Publication of JP4167161B2 publication Critical patent/JP4167161B2/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B21—MECHANICAL METAL-WORKING WITHOUT ESSENTIALLY REMOVING MATERIAL; PUNCHING METAL
    • B21K—MAKING FORGED OR PRESSED METAL PRODUCTS, e.g. HORSE-SHOES, RIVETS, BOLTS OR WHEELS
    • B21K1/00—Making machine elements
    • B21K1/06—Making machine elements axles or shafts
    • B21K1/08—Making machine elements axles or shafts crankshafts
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C3/00—Shafts; Axles; Cranks; Eccentrics
    • F16C3/04—Crankshafts, eccentric-shafts; Cranks, eccentrics
    • F16C3/06—Crankshafts
    • F16C3/08—Crankshafts made in one piece

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ocean & Marine Engineering (AREA)
  • Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
  • Forging (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a crank shaft blank material for a multi-cylinder engine capable of reducing its weight without impairing the rigidity of a crank shaft. <P>SOLUTION: In this forged crank shaft blank material 1 provided with pins 4 respectively on tips of an arm 3 projecting to the die-cutting direction from a journal 2 and an arm 3 projecting to the direction different from the die-cutting direction, thinned parts are respectively formed on central parts of a journal-side surface 5 and a pin-side surface of the arm 3 projecting in the die-cutting direction, by recessed grooves 7, 8 opened to tip sides in the die-cutting direction, whereby an useless thickness can be reduced, and the weight can be reduced without impairing the rigidity of the crank shaft. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、多気筒エンジンの鍛造クランクシャフト粗材に係り、特に、剛性を落すことなく軽量化を図ることができる粗材に関するものである。   The present invention relates to a forged crankshaft rough material of a multi-cylinder engine, and more particularly to a rough material that can be reduced in weight without reducing rigidity.

例えば直列６気筒エンジン用のクランクシャフトをツイスト工法を用いない一体鍛造で製作するに際して、従来では型抜き方向に突出するアームであっても、片割り線との関係から肉盗みすることができない他のアームと同一形状にしていたために、剛性にほとんど寄与しない部分に駄肉がついてしまい、重量を軽減するにも限界があった（例えば特許文献１を参照）。
特開２００３−３５３０７号公報 For example, when producing a crankshaft for an in-line 6-cylinder engine by integral forging without using the twist method, conventionally, even if the arm protrudes in the die-cutting direction, it cannot be stealed from the relationship with the split line. Since the arm has the same shape as that of the arm, the portion that hardly contributes to rigidity is stuck, and there is a limit in reducing the weight (see, for example, Patent Document 1).
JP 2003-35307 A

解決しようとする問題点は、クランクシャフトの剛性を落すことなくその重量を軽減することができない点である。   The problem to be solved is that the weight cannot be reduced without reducing the rigidity of the crankshaft.

本発明は、ジャーナルから型抜き方向に突出するアームおよび型抜き方向と異なる方向に突出するアームの先端にそれぞれピンを設けた鍛造クランクシャフト粗材において、前記型抜き方向に突出するアームにおけるジャーナル側表面およびピン側表面の中央部に、型抜き方向先端側が開放端となる凹溝による肉盗みを設けたことを最も主要な特徴としている。   The present invention relates to a forged crankshaft rough member provided with a pin at each end of an arm protruding in a die cutting direction and an arm protruding in a direction different from the die cutting direction, and the journal side of the arm protruding in the die cutting direction. The main feature is that a meat stealer is provided at the center of the surface and the pin-side surface by a groove having an open end on the tip side in the mold release direction.

本発明は、クランクシャフトの剛性にさほど寄与しないアームにおけるジャーナル側表面およびピン側表面の中央部に、型抜き方向先端側が開放端となる凹溝による肉盗みを設けたものであるから、剛性を落すことなく多気筒エンジンの鍛造クランクシャフトを軽量化することができるという利点がある。   In the present invention, since the arm that does not contribute to the rigidity of the crankshaft does not contribute much to the center of the journal-side surface and the pin-side surface, a meat stealer is provided by a concave groove whose leading end in the mold release direction is an open end. There is an advantage that the forged crankshaft of the multi-cylinder engine can be reduced in weight without dropping.

図１は本発明に係る多気筒エンジンのクランクシャフト粗材の一実施形態を示す要部の側面図、図２は図１のＡ矢視図である。   FIG. 1 is a side view of an essential part showing an embodiment of a rough crankshaft material of a multi-cylinder engine according to the present invention, and FIG.

これらの図において、クランクシャフト粗材１には、ジャーナル２から図示しない鍛造型の型抜き方向に突出する第２、第５気筒用のアーム３および型抜き方向と異なる方向に突出する第１、第３、第４、第６気筒用のアーム（いずれも図示省略）を設けており、各アームの先端にそれぞれピン４を設けている。   In these drawings, the crankshaft rough material 1 includes a second and fifth cylinder arms 3 projecting from a journal 2 in a die cutting direction of a forging die (not shown) and a first projecting in a direction different from the die cutting direction. Arms for the third, fourth, and sixth cylinders (all not shown) are provided, and a pin 4 is provided at the tip of each arm.

ここに本実施形態においては、型抜き方向に突出する第２、第５気筒用のアーム３におけるジャーナル側表面５およびピン側表面６の中央部に、型抜き方向先端側を開放端とした凹溝７、８による肉盗みを設けることにより、このアーム３の重量を低減している。   Here, in the present embodiment, a recess with the front end side in the die-cutting direction as an open end is provided at the center of the journal-side surface 5 and the pin-side surface 6 in the arms 3 for the second and fifth cylinders protruding in the die-cutting direction. By providing meat stealing by the grooves 7 and 8, the weight of the arm 3 is reduced.

なお、ジャーナル２およびピン４ならびにアーム３には必要に応じて従来同様に潤滑油路を設けるとともに、ジャーナル２およびピン４の表面を研削加工してクランクシャフトが構成される。   The journal 2, the pin 4 and the arm 3 are provided with lubricating oil passages as necessary, and the surfaces of the journal 2 and the pin 4 are ground to form a crankshaft.

ところで、本実施形態においては開放端に至るにつれて深さが漸増する凹溝７、８による肉盗みを設けて鍛造型の抜き勾配を確保するようにしているが、要するに鍛造段階で肉盗みを形成することができるものであれば凹溝７、８の形状は任意である。   By the way, in the present embodiment, the stealing of the forging die is ensured by providing the meat stealing by the concave grooves 7 and 8 whose depth gradually increases toward the open end, but in short, the meat stealing is formed at the forging stage. The shape of the concave grooves 7 and 8 is arbitrary as long as it can be performed.

また、クランクシャフトの回転方向前面および後面を除外して、アーム３におけるジャーナル側表面５およびピン側表面６の中央部に凹溝７、８を設けて肉盗みをして駄肉を削減するようにしたものであるために、クランクシャフトの捩り剛性に大きな影響を及ぼす回転方向へのアーム３の剛性はほとんど低下しない。   Further, except for the front and rear surfaces in the rotational direction of the crankshaft, the grooves 3 and 8 are provided in the central portions of the journal side surface 5 and the pin side surface 6 in the arm 3 to steal meat and reduce the waste. Therefore, the rigidity of the arm 3 in the rotation direction that greatly affects the torsional rigidity of the crankshaft is hardly lowered.

そして、肉盗みによる重量の軽減分に相当する分だけ図示しないバランスウェイトを軽量化してクランクシャフトの重量を軽減することができるために、全体として、肉盗みによる軽減重量のほぼ２倍に相当する重量を軽減することが可能となる。よって、クランクシャフトの剛性を低下させることなくその重量を軽減することができ、エンジンの重量軽減に寄与するところは大きい。   Since the balance weight (not shown) can be reduced by the amount corresponding to the weight reduction due to meat theft and the weight of the crankshaft can be reduced as a whole, it corresponds to almost twice the weight reduction due to the meat theft. The weight can be reduced. Therefore, the weight of the crankshaft can be reduced without reducing the rigidity of the crankshaft, which greatly contributes to reducing the weight of the engine.

なお、実施形態においては、本発明を直列６気筒エンジンの鍛造クランクシャフト粗材に適用しているが、例えば直列５気筒エンジン用のクランクシャフトのように鍛造型抜き方向に突出するアームと型抜き方向と異なる方向に突出するアームの先端にそれぞれピンを設けた鍛造クランクシャフト粗材であれば本発明を適用して上記実施形態の場合と同様の作用効果を得ることができる。   In the embodiment, the present invention is applied to the forged crankshaft rough material of the in-line 6-cylinder engine. However, for example, like the crankshaft for the in-line 5-cylinder engine, the arm and the die-cutting project in the forging die-cutting direction. If the forged crankshaft is a rough material provided with a pin at the tip of an arm projecting in a direction different from the direction, the present invention can be applied to obtain the same effect as in the above embodiment.

本発明に係る多気筒エンジンのクランクシャフト粗材の一実施形態を示す要 部の側面図である。1 is a side view of a main part showing an embodiment of a crankshaft coarse material of a multi-cylinder engine according to the present invention. 図１のＡ矢視図である。It is A arrow directional view of FIG.

符号の説明Explanation of symbols

１ クランクシャフト粗材
２ ジャーナル
３ アーム
４ ピン
５ ジャーナル側表面
６ ピン側表面
７、８ 凹溝 1 Crankshaft coarse material 2 Journal 3 Arm 4 Pin 5 Journal side surface 6 Pin side surface 7, 8 Concave groove

Claims (1)

ジャーナル２から型抜き方向に突出するアーム３および型抜き方向と異なる方向に突出するアームの先端にそれぞれピン４を設けた鍛造クランクシャフト粗材１において、前記型抜き方向に突出するアーム３におけるジャーナル側表面５およびピン側表面６の中央部に、型抜き方向先端側が開放端となる凹溝７、８による肉盗みを設けたことを特徴とする多気筒エンジンのクランクシャフト粗材。   The journal 3 in the arm 3 protruding in the die-cutting direction in the arm 3 protruding in the die-cutting direction from the journal 2 and the forged crankshaft rough material 1 provided with the pins 4 at the tips of the arms protruding in the direction different from the die-cutting direction, respectively. A rough crankshaft material for a multi-cylinder engine, characterized in that at the center of the side surface 5 and the pin-side surface 6 a meat stealer is provided by means of concave grooves 7 and 8 having an open end at the front end side in the mold release direction.
JP2003352328A 2003-10-10 2003-10-10 Rough crankshaft for multi-cylinder engines Expired - Fee Related JP4167161B2 (en)

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JP4167161B2 JP4167161B2 (en) 2008-10-15

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009133331A (en) * 2007-11-28 2009-06-18 Sumitomo Metal Ind Ltd Crankshaft for multi-cylinder engine
WO2010110133A1 (en) 2009-03-26 2010-09-30 本田技研工業株式会社 Crankshaft and method for manufacturing same
JP2010230027A (en) * 2009-03-26 2010-10-14 Honda Motor Co Ltd Crankshaft and method for manufacturing the same
JP2016098862A (en) * 2014-11-18 2016-05-30 愛知製鋼株式会社 Crank shaft
JP2016123978A (en) * 2014-12-26 2016-07-11 新日鐵住金株式会社 Method for manufacturing forged crank shaft
EP3072608A4 (en) * 2013-11-21 2017-08-23 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3072609A4 (en) * 2013-11-21 2017-08-23 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3072607A4 (en) * 2013-11-21 2017-08-30 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3170576A4 (en) * 2014-07-14 2018-02-28 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing cast crankshaft
EP3171045A4 (en) * 2014-07-16 2018-05-23 Nippon Steel & Sumitomo Metal Corporation Crank shaft for reciprocating engine
EP3309417A4 (en) * 2015-06-12 2018-12-05 Nippon Steel & Sumitomo Metal Corporation Crankshaft for reciprocating engine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3179116A4 (en) * 2014-08-07 2018-01-24 Nippon Steel & Sumitomo Metal Corporation Crankshaft of reciprocating engine

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009133331A (en) * 2007-11-28 2009-06-18 Sumitomo Metal Ind Ltd Crankshaft for multi-cylinder engine
WO2010110133A1 (en) 2009-03-26 2010-09-30 本田技研工業株式会社 Crankshaft and method for manufacturing same
JP2010230027A (en) * 2009-03-26 2010-10-14 Honda Motor Co Ltd Crankshaft and method for manufacturing the same
EP3072608A4 (en) * 2013-11-21 2017-08-23 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3072609A4 (en) * 2013-11-21 2017-08-23 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3072607A4 (en) * 2013-11-21 2017-08-30 Nippon Steel & Sumitomo Metal Corporation Production method for forged crank shaft
EP3170576A4 (en) * 2014-07-14 2018-02-28 Nippon Steel & Sumitomo Metal Corporation Method for manufacturing cast crankshaft
EP3171045A4 (en) * 2014-07-16 2018-05-23 Nippon Steel & Sumitomo Metal Corporation Crank shaft for reciprocating engine
JP2016098862A (en) * 2014-11-18 2016-05-30 愛知製鋼株式会社 Crank shaft
JP2016123978A (en) * 2014-12-26 2016-07-11 新日鐵住金株式会社 Method for manufacturing forged crank shaft
EP3309417A4 (en) * 2015-06-12 2018-12-05 Nippon Steel & Sumitomo Metal Corporation Crankshaft for reciprocating engine

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