WO2005103513A1 - コネクティングロッド及びその製造方法 - Google Patents
コネクティングロッド及びその製造方法 Download PDFInfo
- Publication number
- WO2005103513A1 WO2005103513A1 PCT/JP2005/007782 JP2005007782W WO2005103513A1 WO 2005103513 A1 WO2005103513 A1 WO 2005103513A1 JP 2005007782 W JP2005007782 W JP 2005007782W WO 2005103513 A1 WO2005103513 A1 WO 2005103513A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- connecting rod
- notch
- divided
- large end
- hole
- Prior art date
Links
Classifications
-
- 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
- F16C9/00—Bearings for crankshafts or connecting-rods; Attachment of connecting-rods
- F16C9/04—Connecting-rod bearings; Attachments thereof
- F16C9/045—Connecting-rod bearings; Attachments thereof the bearing cap of the connecting rod being split by fracturing
Definitions
- the present invention relates to a connecting rod provided by connecting a cap and a main body provided by breaking a large end thereof, and a method of manufacturing the connecting rod.
- a connecting rod (hereinafter also referred to as a connecting rod) 1 is provided with a first through hole 2 at a distal end thereof, while a connecting rod (hereinafter also referred to as a connecting rod) 1 is provided with a first through hole 2 at the other end.
- a second through-hole 3 having a smaller diameter than that is provided.
- the front end on the side provided with the first through-hole 2 is referred to as a large end 4
- the other end on the side provided with the second through-hole 3 is referred to as a small end 5.
- the large end 4 and the small end 5 are connected via a long shaft 6.
- the large end 4 of the connecting rod 1 has a notch N, which is a boundary, in a direction substantially orthogonal to the longitudinal direction of the connecting rod 1 (X direction in FIG. 7) near the center of the first through hole 2 (X direction).
- the connecting rod 1 is divided into a cap portion 7 and a main body portion 8 (see FIG. 6).
- the cap 7 and the main body 8 are connected to each other by bolts (not shown) inserted into the bolt holes 9.
- the connecting rod 1 is a member having a function of connecting the piston of the internal combustion engine and the crankshaft and transmitting the rotational driving force of the crankshaft to the piston.
- this type of connecting rod 1 is formed by forging a preform PR in which a cap 7 and a main body 8 are integrally provided as the same member. Starting from the notches N, N provided on the body PR, the cap part 7 and the main body part 8 are broken, and the cap part 7 and the main body part 8 are connected with each other through bolts passed through the bolt holes 9. (See Patent Documents 1 to 3).
- the preform PR in which a fracture has occurred from a portion other than the notch N is not used as the connecting rod 1, but if the manufacturing yield of the connecting rod 1 is reduced due to this, there is a problem.
- Patent Document 4 proposes that hydrogen is diffused in the vicinity of a notch to cause hydrogen embrittlement, so that brittle fracture is likely to occur in the vicinity of the notch.
- Patent Document 5 discloses that a projected portion projecting outward is provided at a portion to be divided, and the projected portion is crushed to make the portion to be divided harder than other portions. It has been proposed to perform a rupture from the part to be divided.
- Patent Document 1 JP-A-61-21414
- Patent Document 2 Japanese Patent Publication No. 18053
- Patent Document 3 JP-A-64-64729
- Patent Document 4 JP-A-11-108039
- Patent Document 5 JP-A-6-99318
- the thickness of the preform is generally large, and even if a notch is provided, a large breaking load is required to divide the large end. Therefore, the breaking device itself is also large, requiring a high capital investment. [0013] To solve this problem, it is recalled that the depth of the notch is increased. However, in this case, since the contact area between the main body and the cap is reduced, there is a disadvantage that the connection strength between the main body and the cap is reduced.
- a general object of the present invention is to provide a connecting rod having a large contact area between a cap portion and a main body portion.
- a main object of the present invention is to provide a connecting rod in which the connection strength between a main body portion and a cap portion is sufficiently ensured.
- Another object of the present invention is to provide a method for manufacturing a connecting rod that can obtain the above-described connecting rod.
- a large end provided with a first through hole and a small end provided with a second through hole having a diameter smaller than that of the first through hole.
- a long shaft connecting the large end and the small end to each other,
- a connecting rod is provided in which the large end is divided, the divided large ends are connected to each other, and a martensitic structure is formed at a divided portion of the large end.
- a martensite structure is formed at the divided site.
- the large end is easily broken by causing a brittle fracture in the martensite structure.
- the proportion of carbon in a portion where a martensite structure is not formed is 0.1% by weight or more, and the C-scale Rockwell hardness (HRC) of the martensite structure is 30 or more. Preferably, there is. With such a configuration, it is possible to surely cause a brittle fracture due to the martensite structure force.
- a large end portion provided with a first through hole and a second through hole having a diameter smaller than that of the first through hole are provided.
- the martensite structure is generally high in hardness, and therefore has low toughness. Therefore, brittle fracture easily occurs. Therefore, the large end can be easily broken starting from the martensite structure. In addition, since other than the martensite structure does not cause brittle fracture,
- the predetermined predetermined divisional portion force can be reliably broken.
- the breaking force of the large end is also easily broken, so that the breaking load can be reduced. For this reason, the breaking device can be reduced in size, and as a result, the capital investment can be reduced.
- a martensite structure is formed at a site to be fractured, and a brittle fracture is caused in the martensite structure to divide the large end portion.
- the applied breaking load can be reduced, and the size of the breaking device can be reduced.
- a notch may be provided in advance at a portion to be divided!
- the bottom of the notch may be transformed into a martensite structure.
- the preformed body is also made of a steel material having a carbon ratio of 0.1% by weight or more.
- the HRC of the obtained martensite structure is 30 or more, indicating relatively high hardness. Such high-hardness portions easily cause brittle fracture, so that it is easier to break the large end.
- FIG. 1 is an overall schematic front view of a connecting rod according to the present embodiment.
- FIG. 2 is an enlarged cross-sectional view of a main part, in which the vicinity of a notch provided on the connecting rod of FIG. 1 is enlarged.
- FIG. 3A to FIG. 3E are flowcharts showing a process of manufacturing the connecting rod of FIG. 1.
- FIG. 4 is an enlarged cross-sectional view of a main part, in which a portion where a notch having a curved bottom is provided is enlarged.
- FIG. 5 is an enlarged cross-sectional view of a main part, in which a portion to be broken is enlarged in another embodiment.
- FIG. 6 is an overall schematic perspective view of a connecting rod according to a conventional technique.
- FIG. 7 is a schematic overall perspective view of a preform before being broken.
- FIG. 1 is an overall schematic front view of a connecting rod 10 according to the present embodiment.
- the connecting rod 10 has a large end 4 having a first through hole 2, a small end 5 having a second through hole 3 having a diameter smaller than that of the first through hole 2, and a large end 4 having a large diameter. It has a shaft 6 connecting the end 4 and the small end 5.
- the connecting rod 10 is a steel material having a carbon ratio of 0.1% by weight or more, for example, chromium molybdenum steel.
- the first through hole 2 is broken in the direction (Y direction) orthogonal to the longitudinal direction (X direction in FIG. 1) of the connecting rod 10 near the center, whereby the connecting rod 10 is Kya It is divided into a top section 7 and a main body section 8.
- the large end 4 is divided starting from the notches N, N.
- cap 7 and the main body 8 are connected to each other via bolts 12, 12 inserted into the holes 9, 9.
- the vicinity of the notch N is enlarged and shown in FIG.
- the depth D of the notch N is approximately 0
- the opening width Wi is about 0.15 to 0.20 mm.
- the large end of the notch is broken from the approximate center of the bottom of the notch.
- a martensite portion As shown in Fig. 2, near the bottom of the notch ⁇ , there is a portion where a martensite structure is formed (hereinafter, this portion is referred to as a martensite portion, and the reference numeral is 20). I do.
- the martensite site 20 has a higher hardness than other sites where no martensite structure is formed.
- brittle fracture is likely to occur !, and it is provided near the bottom of the 20-force S notch of the martensite portion. As described later, the brittle fracture of the martensite portion 20 causes the large end 4 to break.
- the HRC of the martensite site 20 is preferably 30 or more. If it is less than 30, the toughness increases, so that brittle fracture hardly occurs. More preferably, HRC is 40 or more
- the HRC other than the martensite site 20 may be about 25 or less, but is not particularly limited thereto.
- the large end 4 of the connecting rod 10 according to the present embodiment is fractured in the direction of ⁇ in FIG. 1 with the notch ⁇ as a boundary due to the fracture starting from the bottom of the notch ⁇ ! You. That is, the fracture did not occur from a place other than the notches ⁇ and ⁇ .
- the depth D of the notch ⁇ ⁇ is less than 1 mm, and the opening width W is as small as about 0.5 mm! /.
- the contact area between the cap 7 and the main body 8 is increased, and the connection strength between the cap 7 and the main body 8 is also ensured.
- the connecting rod 10 can be manufactured as follows. [0045] As shown in Fig. 3A, first, forging is performed on a work that preferably has a chromium molybdenum steel strength in which the ratio of carbon is 0.1% by weight or more and the HRC is less than 25. A compact PR is produced.
- Notches N and N are provided near the center of 2.
- a martensite structure is formed near the bottom of the notches N, N. That is, the vicinity of the bottom of the notch N, N in the preformed body PR is selectively heated and then rapidly cooled to transform the austenitic structure near the bottom of the notch N, N into a martensite structure.
- the method of selectively heating the notch N and the vicinity of the bottom of the N is not particularly limited.
- a method of intensively irradiating a laser beam is exemplified. Is done. Note that the irradiation depth of the laser beam, which is set depending on the thickness of the preform PR, is about 0.12 mm, which is sufficient for 1S. Also, instead of laser light, irradiate plasma.
- the notch N near the bottom of N, is heated to a high temperature by irradiating a laser beam or plasma, the irradiation is stopped and allowed to cool in the atmosphere. With this cooling, martensitic transformation occurs, and as a result, martensite sites 20 are formed (see FIG. 2).
- the material of the preform PR is a steel material having a carbon ratio of 0.1% by weight or more
- the HRC of the martensite portion 20 is 30 or more.
- the preform PR is subjected to a breaking process shown in Fig. 3D without tempering. This is because, when tempering is performed, the toughness of the martensite portion 20 is improved, and brittle fracture is less likely to occur.
- the martensite portion 20 causes brittle fracture. That is, a crack starting from the notch N occurs at the martensite portion 20. As the cracks propagate sequentially, the large end 4 is finally divided, and the cap 7 and the main body 8 are provided (see FIG. 2).
- the rupture load applied to generate and propagate cracks can be reduced as compared with the prior art. That is, The size of the breaking device can be reduced, and ultimately the equipment investment can be reduced.
- brittle fracture can be prevented at the bottom. It can be made to occur only in the vicinity. That is, since a structure that may cause brittle fracture is not generated in other portions, the notch N reliably serves as a starting point, and the large end portion 4 can be easily broken. Therefore, the large end 4 is not broken by the force other than the notches N and N, and the notches N and N do not remain on the connecting rod 10 after manufacturing, so that the manufacturing yield of the connecting rod 10 is reduced. There is no.
- the notch N has a depth D of less than 1 mm and an opening width W of about 0.5 mm. Therefore, the contact area between the cap 7 and the main body 8 after being broken can be prevented from being reduced, and the connection strength between the cap 7 and the main body 8 can be reduced by / J. Nor.
- the chromium molybdenum steel is exemplified as the material of the connecting rod 10, and nickel chromium molybdenum steel, which is not particularly limited thereto, may be used.
- the bottom of the notch N may be curved as shown in Fig. 4, which does not necessarily have to have an acute angle.
- a martensite portion 20 is provided by irradiating a laser beam or a plasma to the portion to be divided in the same manner as described above, and thereafter, the martensite portion 20 undergoes brittle fracture to crack. Let's spread it.
- the portion irradiated with the laser light or the plasma is slightly etched by the laser light or the plasma to form a depression 22 having a depth of about 100 to 200 m.
- the depression 22 serves as a fracture starting point, cracks propagate, and the fracture can be easily performed.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
- Forging (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/578,702 US20070209629A1 (en) | 2004-04-26 | 2005-04-25 | Connecting Rod and Method for Production Thereof |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004129950A JP2005308189A (ja) | 2004-04-26 | 2004-04-26 | コネクティングロッド及びその製造方法 |
JP2004-129950 | 2004-04-26 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2005103513A1 true WO2005103513A1 (ja) | 2005-11-03 |
Family
ID=35197051
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/007782 WO2005103513A1 (ja) | 2004-04-26 | 2005-04-25 | コネクティングロッド及びその製造方法 |
Country Status (4)
Country | Link |
---|---|
US (1) | US20070209629A1 (ja) |
JP (1) | JP2005308189A (ja) |
CN (1) | CN100425848C (ja) |
WO (1) | WO2005103513A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008129277A1 (en) * | 2007-04-20 | 2008-10-30 | The University Of Nottingham | Fracture site formation |
Families Citing this family (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2006051822A1 (ja) * | 2004-11-09 | 2006-05-18 | Honda Motor Co., Ltd. | コネクティングロッドの検査装置及び検査方法 |
JP2010076087A (ja) * | 2008-09-01 | 2010-04-08 | Yasunaga Corp | 鍛造材からなる延性金属製部品の破断面開始部形成方法 |
DE102008047688A1 (de) * | 2008-09-18 | 2010-03-25 | Man Nutzfahrzeuge Ag | Verfahren zum Bruchtrennen von Werkstücken |
CN102039444A (zh) * | 2010-11-04 | 2011-05-04 | 奇瑞汽车股份有限公司 | 一种连杆涨断装置及使用方法 |
CN102626777B (zh) | 2012-04-17 | 2014-10-29 | 江苏大学 | 一种复合双金属裂解连杆的制造方法 |
DE102012015385B3 (de) * | 2012-08-02 | 2013-08-08 | Alfing Kessler Sondermaschinen Gmbh | Bruchtrennvorrichtung und Bruchtrennverfahren zum Bruchtrennen von Werkstücken |
US9664229B2 (en) * | 2013-04-26 | 2017-05-30 | GM Global Technology Operations LLC | Connecting rod |
WO2020126005A1 (en) * | 2018-12-20 | 2020-06-25 | Volvo Truck Corporation | A connecting rod for an engine of a vehicle |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
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JPH10128481A (ja) * | 1996-10-25 | 1998-05-19 | Honda Motor Co Ltd | コネクティングロッドの製造方法 |
JPH11108039A (ja) * | 1997-10-03 | 1999-04-20 | Hino Motors Ltd | コンロッドの製造方法 |
JP2000310329A (ja) * | 1999-04-28 | 2000-11-07 | Yamaha Motor Co Ltd | 表面硬化処理したコンロッド |
JP2002275578A (ja) * | 2001-03-21 | 2002-09-25 | Daido Steel Co Ltd | 破断による分離が容易な熱間鍛造用非調質鋼 |
JP2002372029A (ja) * | 2001-06-12 | 2002-12-26 | Tdk Corp | Dlcを施したコネクティングロッド |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4569109A (en) * | 1984-07-02 | 1986-02-11 | General Motors Corporation | Method of making a split bearing assembly |
FR2742448B1 (fr) * | 1995-12-14 | 1998-01-16 | Ascometal Sa | Acier pour la fabrication de pieces de mecanique secables et piece obtenue |
US5974663A (en) * | 1996-10-25 | 1999-11-02 | Honda Giken Kogya Kabushiki Kaisha | Method of manufacturing connecting rod |
US7418886B2 (en) * | 2002-12-26 | 2008-09-02 | Yamaha Hatsudoki Kabushiki Kaisha | Split type connecting rod |
US7299716B2 (en) * | 2002-12-26 | 2007-11-27 | Yamaha Hatsudoki Kabushiki Kaisha | Split type connecting rod |
EP1450056B1 (en) * | 2003-02-19 | 2017-06-07 | Nissan Motor Co., Ltd. | High-strength connecting rod and method of producing same |
-
2004
- 2004-04-26 JP JP2004129950A patent/JP2005308189A/ja active Pending
-
2005
- 2005-04-25 US US11/578,702 patent/US20070209629A1/en not_active Abandoned
- 2005-04-25 WO PCT/JP2005/007782 patent/WO2005103513A1/ja active Application Filing
- 2005-04-25 CN CNB2005800130381A patent/CN100425848C/zh not_active Expired - Fee Related
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH10128481A (ja) * | 1996-10-25 | 1998-05-19 | Honda Motor Co Ltd | コネクティングロッドの製造方法 |
JPH11108039A (ja) * | 1997-10-03 | 1999-04-20 | Hino Motors Ltd | コンロッドの製造方法 |
JP2000310329A (ja) * | 1999-04-28 | 2000-11-07 | Yamaha Motor Co Ltd | 表面硬化処理したコンロッド |
JP2002275578A (ja) * | 2001-03-21 | 2002-09-25 | Daido Steel Co Ltd | 破断による分離が容易な熱間鍛造用非調質鋼 |
JP2002372029A (ja) * | 2001-06-12 | 2002-12-26 | Tdk Corp | Dlcを施したコネクティングロッド |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2008129277A1 (en) * | 2007-04-20 | 2008-10-30 | The University Of Nottingham | Fracture site formation |
Also Published As
Publication number | Publication date |
---|---|
CN100425848C (zh) | 2008-10-15 |
JP2005308189A (ja) | 2005-11-04 |
CN1946943A (zh) | 2007-04-11 |
US20070209629A1 (en) | 2007-09-13 |
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