JPH0118291B2 - - Google Patents
Info
- Publication number
- JPH0118291B2 JPH0118291B2 JP56133325A JP13332581A JPH0118291B2 JP H0118291 B2 JPH0118291 B2 JP H0118291B2 JP 56133325 A JP56133325 A JP 56133325A JP 13332581 A JP13332581 A JP 13332581A JP H0118291 B2 JPH0118291 B2 JP H0118291B2
- Authority
- JP
- Japan
- Prior art keywords
- hardness
- parts
- connecting rod
- large end
- divided
- 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
- 238000005255 carburizing Methods 0.000 claims description 7
- 230000002093 peripheral effect Effects 0.000 claims description 7
- 238000002485 combustion reaction Methods 0.000 claims description 5
- 238000010791 quenching Methods 0.000 claims description 5
- 230000000171 quenching effect Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 230000000977 initiatory effect Effects 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、内燃機関の連接棒に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a connecting rod for an internal combustion engine.
［従来の技術］
従来、大端部が２分割されている連接棒は、大
端部の左右各分割部に、破断面の進行を誘導可能
とする分割補助孔を設けるとともに、破断面に浸
炭焼入をして硬化させ、大端部を本体部とキヤツ
プ部とに２分割可能としている。[Prior Art] Conventionally, a connecting rod whose large end is divided into two parts is provided with a splitting auxiliary hole in each of the left and right divided parts of the large end to guide the progression of the fractured surface, and to provide an immersion hole in the fractured surface. It is hardened by charcoal quenching, and the large end can be divided into a main body and a cap.
［発明が解決しようとする課題］
しかしながら、このような分割によつて得られ
る破断面は、平坦な面となり、本体部とキヤツプ
部との再組付時に、両者を高い再組精度で再組付
けすることが困難である。[Problems to be Solved by the Invention] However, the fracture surface obtained by such division becomes a flat surface, and when reassembling the main body and the cap, it is difficult to reassemble both with high reassembly accuracy. It is difficult to attach.
本発明は、２分割されている本体部とキヤツプ
部とが容易に高い再組精度で再組付け可能となる
内燃機関の連接棒を得るを目的とする。 SUMMARY OF THE INVENTION An object of the present invention is to provide a connecting rod for an internal combustion engine in which a main body portion and a cap portion, which are divided into two parts, can be easily reassembled with high reassembly accuracy.
［課題を解決するための手段］
本発明は、大端部の軸受孔に挿入される分割工
具の拡張力により、大端部が左右の各分割部で２
分割に破断されてなる内燃機関の連接棒におい
て、前記左右の各分割部の破断予定部分に浸炭焼
入による高硬度部を形成するとともに、上記破断
予定部分の少なくとも大端内周側に上記高硬度部
に囲まれる低硬度部を形成し、かつ上記低硬度部
は大端内周側にて大端外周側におけるよりも大き
な領域を占めるように形成されるようにしたもの
である。[Means for Solving the Problems] The present invention allows the large end to be split into two parts at each of the left and right split parts by the expansion force of the splitting tool inserted into the bearing hole of the big end.
In a connecting rod for an internal combustion engine that is broken into parts, a high-hardness part is formed by carburizing and quenching at the part scheduled to break in each of the left and right divided parts, and the high hardness part is formed at least on the inner peripheral side of the large end of the part scheduled to break. A low hardness portion surrounded by a hardness portion is formed, and the low hardness portion is formed to occupy a larger area on the inner peripheral side of the big end than on the outer peripheral side of the big end.
なお、本発明は上記低硬度部が破断予定部分の
少なくとも大端内周側にあればよく、この低硬度
部が大端外周側に全くないものをも含む。 In addition, in the present invention, it is sufficient that the low hardness portion is located at least on the inner circumferential side of the large end of the portion to be broken, and also includes a structure in which the low hardness portion is not present on the outer circumferential side of the large end at all.
［作用］ 上記本発明によれば、以下の作用効果がある。[Effect] According to the above-mentioned present invention, there are the following effects.
本発明において、高硬度部と低硬度部を形成
された大端部の軸受孔に分割工具を挿入し、分
割工具の拡張力により大端部を分割する時、高
硬度部と低硬度部の硬度差によつて亀裂の伝幡
速度および方向が異なる。すなわち、高硬度部
を進行する亀裂は、低硬度部の手前で枝分れ
し、比較的柔らかい低硬度部を残して、周りの
高硬度部を進行し、低硬度部の部分はもぎ取ら
れるようにして割れ、破断面には、分割方向に
対して明瞭な凹凸部が形成される。 In the present invention, when a splitting tool is inserted into the bearing hole of the large end in which the high hardness part and the low hardness part are formed, and the large end is split by the expansion force of the splitting tool, the high hardness part and the low hardness part are separated. The crack propagation speed and direction differ depending on the hardness difference. In other words, a crack that progresses through a high-hardness area branches before the low-hardness area, leaves a relatively soft low-hardness area, and advances through the surrounding high-hardness area, and the low-hardness area is torn off. The cracked surface is clearly uneven in the direction of splitting.
また、上記破断面は大端内周部から開始し、
大端外周側へ発達し、最終的に破断終了する
が、破断の特性上、開始点側は安定して破断す
るが、後半特に破断終了付近では不安定とな
る。最悪時には、破断終了点付近に欠け等の破
断不良部分を牛ずることがある。しかるに、本
発明によれば、上記における低硬度部のもぎ
取られる如くの破断が主として、破断開始側の
大端内周側にて行なわれるから、上記による
凹凸部を安定して形成できる。 In addition, the above-mentioned fracture surface starts from the inner circumference of the big end,
It develops toward the outer periphery of the large end and finally completes the fracture, but due to the characteristics of fracture, the fracture occurs stably on the starting point side, but becomes unstable in the latter half, especially near the end of the fracture. In the worst case, a defective part such as a chip may occur near the end point of the fracture. However, according to the present invention, the above-mentioned breakage as if the low-hardness portion is torn off occurs mainly on the inner peripheral side of the large end on the breakage initiation side, so that the above-mentioned uneven portion can be stably formed.
したがつて、本発明によれば、上記、の
結果として、大端部の左右の各分割部は、明瞭
な凹凸部を安定的に形成せしめられ、両者は分
割後において高い再組精度で再組付け可能とな
る。 Therefore, according to the present invention, as a result of the above, each of the left and right divided parts of the large end can stably form clear uneven parts, and both parts can be reassembled with high reassembly accuracy after being divided. Can be assembled.
［実施例］
以下、本発明の実施例を図面を参照して説明す
る。[Example] Hereinafter, an example of the present invention will be described with reference to the drawings.
第１図は、本発明に係る連接棒の要部とその分
割状況を示す平面図であり、第２図は、同連接棒
を示す側面図であり、第３図は、第１図の−
線に沿う断面の拡大図であり、第４図は、同連接
棒の分割時の状況を示す断面図であり、第５図
は、第３図の−線に沿う拡大断面図である。 FIG. 1 is a plan view showing the main parts of the connecting rod according to the present invention and how they are divided, FIG. 2 is a side view showing the connecting rod, and FIG.
FIG. 4 is an enlarged cross-sectional view taken along the line, FIG. 4 is a cross-sectional view showing the connecting rod when it is divided, and FIG. 5 is an enlarged cross-sectional view taken along the line - in FIG. 3.
連接棒１１は、鍛造された後、浸炭防止の銅め
つきを施され、図示されない小端部に孔加工を施
されるとともに、大端部１２に、平軸受を背面支
持する軸受孔１３、分割後のキヤツプ部を本体部
に締め付け可能とするボルト用のボルト孔１４が
それぞれ穿設される。なお、軸受孔１３の中心Ｏ
に関する対称位置で、ボルト孔１４の配設部分
は、左右の各分割部１５とされている。 After the connecting rod 11 is forged, it is copper-plated to prevent carburization, a small end (not shown) is machined with a hole, and a large end 12 is provided with a bearing hole 13 for back-supporting a plain bearing. Bolt holes 14 are provided for bolts that allow the divided cap portions to be fastened to the main body portion. Note that the center O of the bearing hole 13
The bolt holes 14 are disposed at symmetrical positions with respect to each other, and the left and right divided portions 15 are provided.
上記のように大端部１２に、軸受孔１３および
ボルト孔１４が穿設された連接棒１１は、次に所
定の浸炭条件下で浸炭焼入を施される。この浸炭
焼入により、左右の各分割部１５の破断予定部分
には、第３図に示すように、各部の肉厚と、浸炭
焼入深さとの関係から、浸炭焼入による高硬度部
１６と、高硬度部１６に囲まれる低硬度部１７，
１８とからなる硬度分布が形成される。ここで、
大端内周側の低硬度部１７は、大端内周側により
大きな肉厚部が形成されていることから、大端外
周側の低硬度部１８に比して、より大きな領域を
得ている。なお、破断面の全面積に対する上記低
硬度部１７，１８の領域の大小は、浸炭時間、温
度、炭素濃度等の浸炭条件の調整によつて可変と
なる。 The connecting rod 11 in which the bearing hole 13 and the bolt hole 14 are bored in the large end portion 12 as described above is then carburized and quenched under predetermined carburizing conditions. As a result of this carburizing and quenching, as shown in FIG. and a low hardness portion 17 surrounded by a high hardness portion 16,
A hardness distribution consisting of 18 is formed. here,
The low hardness portion 17 on the inner circumference side of the big end has a larger wall thickness formed on the inner circumference side of the big end, so it has a larger area than the low hardness portion 18 on the outer circumference side of the big end. There is. The size of the regions of the low hardness parts 17 and 18 relative to the total area of the fracture surface can be varied by adjusting carburizing conditions such as carburizing time, temperature, and carbon concentration.
上記の浸炭焼入を施された連接棒１１は、次に
第１図および第４図に示すように、軸受孔１３内
の分割線に対する両側に一対の分割カラー１９
Ａ，１９Ｂ（分割工具）を挿入し、両分割カラー
１９Ａ，１９Ｂ（分割工具）間にくさび２０を打
ち込むことにより、大端部１２が本体部１２Ａと
キヤツプ部１２Ｂとに分割される。この時、各分
割部１５に生成される破断面においては、各部の
硬度差によつて亀裂の伝播速度および方向が異な
ることから、第５図に示すように、高硬度部１６
内を進行する亀裂は、低硬度部１７，１８の手前
で枝分れし、比較的軟かい低硬度部１７，１８を
残して、周りの高硬度部１６内を進行し、低硬度
部１７，１８の部分はもぎ取られるようにして割
れ、破断面には、分割方向に対して明瞭な凹凸部
が形成される。（第５図においては低硬度部１７
は凸部となつているが、対応する分割破断図では
低硬度部１７が凹部となつている。）
また、上記連接棒１１の大端部１２に形成され
る破断面は大端内周部から開始し、大端外周側へ
発達し、最終的に破断終了するが、破断の特性
上、開始点側は安定して破断するが、後半特に破
断終了付近では不安定となる。最悪時には、破断
終了点付近に欠け等の破断不良部分を生ずること
がある。しかるに、上記実施例においては、破断
予定部分に形成される低硬度部は、大端内周側に
おいてより大きな領域（低硬度部１７の領域）を
占めることとされている。したがつて、上記に
おける低硬度部１７，１８のもぎ取られる如くの
破断が、主として、破断開始側の大端内周部の低
硬度部１７において行なわれるから、上記によ
る凹凸部を破断面に安定して形成できる。 The connecting rod 11 which has been subjected to the carburizing and quenching described above is then fitted with a pair of dividing collars 19 on both sides of the dividing line in the bearing hole 13, as shown in FIGS. 1 and 4.
By inserting collars A and 19B (dividing tools) and driving a wedge 20 between the two dividing collars 19A and 19B (dividing tools), the large end portion 12 is divided into a main body portion 12A and a cap portion 12B. At this time, on the fracture surface generated in each divided portion 15, the crack propagation speed and direction differ depending on the difference in hardness of each portion, so as shown in FIG.
The crack that propagates inside branches out before the low hardness parts 17 and 18, leaves the relatively soft low hardness parts 17 and 18, and progresses inside the surrounding high hardness part 16 to form the low hardness part 17. , 18 are torn off and cracked, and the fractured surface has a clear unevenness in the direction of division. (In Fig. 5, the low hardness part 17
is a convex portion, but in the corresponding divided cutaway diagram, the low hardness portion 17 is a concave portion. ) Furthermore, the fracture surface formed at the large end 12 of the connecting rod 11 starts from the inner periphery of the large end, develops toward the outer periphery of the large end, and finally ends; however, due to the characteristics of the rupture, The point side breaks stably, but it becomes unstable in the latter half, especially near the end of the break. In the worst case, a defective fracture portion such as a chip may occur near the fracture end point. However, in the above-mentioned embodiment, the low hardness portion formed in the portion to be broken occupies a larger area (the area of the low hardness portion 17) on the inner peripheral side of the big end. Therefore, since the above-mentioned breaking of the low-hardness parts 17 and 18 as if being torn off occurs mainly in the low-hardness part 17 of the inner peripheral part of the large end on the breakage initiation side, the above-mentioned irregularities are stabilized on the fracture surface. It can be formed by
したがつて上記実施例によれば、大端部１２の
左右の各分割部１５は、高硬度部１６と低硬度部
１７，１８からなる硬度分布が形成される状態下
で破断され、破断面に明瞭な凹凸部が安定的に形
成されることから、分割された本体部１２Ａとキ
ヤツプ部１２Ｂが分割状態でクランク軸のクラン
クピンに装着された後の再組付け時に、両者は破
断面２１に形成されている明瞭な凹凸部によつて
自動的に調芯されて、分割前におけると同様な一
体化状態に再現可能となり、容易に高い再組精度
で再組付け可能となる。 Therefore, according to the above embodiment, each of the left and right divided portions 15 of the large end portion 12 is fractured under a condition in which a hardness distribution consisting of the high hardness portion 16 and the low hardness portions 17 and 18 is formed, and the fracture surface is Since clearly defined uneven parts are stably formed on the main body part 12A and the cap part 12B, when they are reassembled after being attached to the crank pin of the crankshaft in the divided state, both parts will have a broken surface 21. It is automatically aligned by the clear unevenness formed in the parts, and it becomes possible to reproduce the same integrated state as before the division, and it becomes possible to easily reassemble with high reassembly accuracy.
［発明の効果］
以上のように本発明によれば、大端部の左右の
各分割部は、明瞭な凹凸部を安定的に形成せしめ
られ、両者は分割後において高い再組精度で再組
付け可能となる。[Effects of the Invention] As described above, according to the present invention, each of the left and right divided parts of the large end can stably form clear uneven parts, and both can be reassembled with high reassembly accuracy after being divided. It can be attached.
第１図は本発明の一実施例に係る連接棒とその
分割時の状況とを示す平面図、第２図は同連接棒
を示す側面図、第３図は第１図の−線に沿う
拡大断面図、第４図は同連接棒の分割状況を示す
断面図、第５図は第３図の−線に沿う拡大断
面図である。
１１……連接棒、１２……大端部、１２Ａ……
本体部、１２Ｂ……キヤツプ部、１５……分割
部、１６……高硬度部、１７，１８……低硬度
部。
FIG. 1 is a plan view showing a connecting rod according to an embodiment of the present invention and its state when divided, FIG. 2 is a side view showing the connecting rod, and FIG. 3 is taken along the - line in FIG. 1. FIG. 4 is an enlarged sectional view showing how the connecting rod is divided, and FIG. 5 is an enlarged sectional view taken along the line - in FIG. 3. 11...Connecting rod, 12...Big end, 12A...
Main body part, 12B...Cap part, 15...Divided part, 16...High hardness part, 17, 18...Low hardness part.
Claims (1)
力により、大端部が左右の各分割部で２分割に破
断されてなる内燃機関の連接棒において、前記左
右の各分割部の破断予定部分に浸炭焼入による高
硬度部を形成するとともに、上記破断予定部分の
少なくとも大端内周側に上記高硬度部に囲まれる
低硬度部を形成し、かつ上記低硬度部は大端内周
側にて大端外周側におけるよりも大きな領域を占
めるように形成されることを特徴とする内燃機関
の連接棒。1. In a connecting rod for an internal combustion engine, in which the large end is broken into two parts at each of the left and right parts by the expansion force of a splitting tool inserted into the bearing hole of the big end, the fracture of each of the left and right parts. A high-hardness part is formed by carburizing and quenching in the planned part, and a low-hardness part surrounded by the high-hardness part is formed at least on the inner peripheral side of the big end of the part to be broken, and the low-hardness part is surrounded by the inside of the big end. A connecting rod for an internal combustion engine, characterized in that it is formed to occupy a larger area on the circumferential side than on the outer circumferential side of the big end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13332581A JPS5837311A (en) | 1981-08-27 | 1981-08-27 | Connecting rod of internal-combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13332581A JPS5837311A (en) | 1981-08-27 | 1981-08-27 | Connecting rod of internal-combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5837311A JPS5837311A (en) | 1983-03-04 |
| JPH0118291B2 true JPH0118291B2 (en) | 1989-04-05 |
Family
ID=15102062
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13332581A Granted JPS5837311A (en) | 1981-08-27 | 1981-08-27 | Connecting rod of internal-combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5837311A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6182016A (en) * | 1984-09-14 | 1986-04-25 | Honda Motor Co Ltd | Connecting rod of reciprocating engine |
-
1981
- 1981-08-27 JP JP13332581A patent/JPS5837311A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5837311A (en) | 1983-03-04 |
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