JPH0578739A - Method for reinforcing rear accel housing for automobile - Google Patents
Method for reinforcing rear accel housing for automobileInfo
- Publication number
- JPH0578739A JPH0578739A JP26840091A JP26840091A JPH0578739A JP H0578739 A JPH0578739 A JP H0578739A JP 26840091 A JP26840091 A JP 26840091A JP 26840091 A JP26840091 A JP 26840091A JP H0578739 A JPH0578739 A JP H0578739A
- Authority
- JP
- Japan
- Prior art keywords
- rear axle
- axle housing
- housing
- accel
- automobile
- 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.)
- Granted
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、自動車のリヤアクスル
ハウジングの疲れ強さを向上させる強化方法に関するも
のである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing method for improving the fatigue strength of a rear axle housing of an automobile.
【０００２】[0002]
【従来の技術】自動車に用いられているリヤアクスルハ
ウジングの下面には、車両重量による引張応力が加わる
と共に、走行にともなう動荷重が加わる。このように過
酷な条件で使用されるリヤアクスルハウジングの強度を
高くするために、従来ではリヤアクスルハウジングを焼
入れした後、比較的高い温度に焼もどしてトルースタイ
トまたはソルバイト組織にするという調質を行なうこと
が多かった。2. Description of the Related Art Tensile stress due to the weight of a vehicle is applied to the lower surface of a rear axle housing used in an automobile, and a dynamic load associated with traveling is applied. In order to increase the strength of the rear axle housing used under such harsh conditions, the conventional practice is to quench the rear axle housing and then temper it to a relatively high temperature to obtain a troostite or sorbite structure. There were many
【０００３】ところが、このような調質には多大な時間
を必要とする焼入れ、焼もどしをする必要性があるので
加工効率が悪い。さらに、必ずしも強化する必要性のな
い部分までをも強化の必要な部分と同様に加熱する必要
性があり、しかも、自動車の重量を軽減すべくリヤアク
スルハウジングを薄肉軽量化すると、これにともなって
強度が低下するという不具合があった。However, since such tempering requires quenching and tempering which require a great deal of time, the processing efficiency is poor. Furthermore, even parts that do not necessarily need to be strengthened need to be heated in the same way as parts that need to be strengthened. Moreover, if the rear axle housing is made thinner and lighter in order to reduce the weight of the vehicle, the strength will increase accordingly. There was a problem that the value decreased.
【０００４】また、このような不具合を解決するため
に、例えば特開昭５９−２４５４３号公報に見られるよ
うに、リヤアクスルハウジングを鋳物で構成し、各部を
機械加工した後にこのリヤアクスルハウジングの表面に
ショットピーニングを施すことも有効である。In order to solve such a problem, for example, as disclosed in Japanese Patent Laid-Open No. 59-24543, the rear axle housing is made of cast metal, and after each part is machined, the surface of the rear axle housing is machined. It is also effective to apply shot peening.
【０００５】しかしながら、近年のように軽量化を強い
られるにもかかわらず強度の向上が望まれる場合は、シ
ョットピーニングを施すのみでは必ずしも充分な強化を
行ない得ないという不具合があった。However, when it is desired to improve the strength in spite of the recent demand for weight reduction, there is a problem that sufficient strengthening cannot always be achieved only by performing shot peening.
【０００６】[0006]
【発明が解決しようとする課題】本発明はこのような実
状に鑑みてなされたものであり、重量の増加をもたらす
ことなく自動車用リヤアクスルハウジングの疲れ強さを
向上させることを課題としている。SUMMARY OF THE INVENTION The present invention has been made in view of such circumstances, and an object thereof is to improve the fatigue strength of a rear axle housing for an automobile without increasing the weight.
【０００７】[0007]
【課題を解決するための手段】上記課題を解決するため
に本発明は、上面にスプリングシートが設けられたリヤ
アクスルハウジングを、その両端に設けられているアク
スルパイプで支えつつ前記スプリングシートに圧縮荷重
を加えて該リヤアクスルハウジングの下面に引張応力を
与える。そして、このようにして引張応力が与えられて
いるリヤアクスルハウジングの下面にショットピーニン
グを施すことを特徴としている。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention supports a rear axle housing having spring seats on its upper surface while supporting a rear axle housing at both ends thereof while compressing a load on the spring seats. Is applied to apply a tensile stress to the lower surface of the rear axle housing. The lower axle of the rear axle housing thus subjected to the tensile stress is shot peened.
【０００８】[0008]
【作用】両端で支持されたリヤアクスルハウジングの上
面に形成されているスプリングシートに圧縮荷重を加え
ると、この荷重がリヤアクスルハウジングに曲げ外力と
して加わるために、このリヤアクスルハウジングの下面
に引張応力が発生する。そして、このようにして引張応
力が与えられているリヤアクスルハウジングの下面にシ
ョットピーニングを施してその表面層を展延させた後に
スプリングシートへの荷重を取り除くと、リヤアクスル
ハウジングの下面に高い圧縮残留応力が残される。When a compressive load is applied to the spring seat formed on the upper surface of the rear axle housing supported at both ends, this load is applied as a bending external force to the rear axle housing, so that tensile stress is generated on the lower surface of the rear axle housing. .. Then, if the lower surface of the rear axle housing to which the tensile stress is applied in this way is shot peened to spread its surface layer and then the load on the spring seat is removed, a high compressive residual stress is applied to the lower surface of the rear axle housing. Is left.
【０００９】このために、本発明による強化処理を施し
たリヤアクスルハウジングを用いた自動車によれば、車
体重量によりリヤアクスルハウジングの下面に発生しよ
うとする引張応力が前記圧縮残留応力で効果的にキャン
セルされることになり、リヤアクスルハウジングの疲れ
強さが一段と高くなる。従って、リヤアクスルハウジン
グの重量の増加をともなうことなくその疲れ強さを高く
することができ、あるいは、疲れ強さを低下させること
なくリヤアクスルハウジングを薄肉軽量化することがで
きる。Therefore, according to the automobile using the rear axle housing which has been strengthened according to the present invention, the compressive residual stress effectively cancels the tensile stress generated on the lower surface of the rear axle housing due to the weight of the vehicle body. As a result, the fatigue strength of the rear axle housing becomes even higher. Therefore, the fatigue strength can be increased without increasing the weight of the rear axle housing, or the rear axle housing can be made thin and lightweight without reducing the fatigue strength.
【００１０】[0010]
【実施例】図１は本発明に係る自動車用リヤアクスルハ
ウジングの強化方法による加工状況の一例を示した概略
正面図であり、バンジョウ型をなす自動車用リヤアクス
ルハウジング１の両端にはアクスルパイプ２、２を設け
ると共に、このリヤアクスルハウジング１の上面１ａに
スプリングシート３、３を形成することにより、このス
プリングシート３、３に取付けたスプリング（図示省
略）を車体に取付けるようにしている。４、４はスプリ
ングシート３、３に対応してリヤアクスルハウジング１
の上面１ａに設けたスプリング取付け用のアーム、５、
５はリヤアクスルハウジング１の下面１ｂに設けたトル
クロッド取付け用のアームである。DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a schematic front view showing an example of a processing state by a method for strengthening a rear axle housing for an automobile according to the present invention. Axle pipes 2, 2 are provided at both ends of a rear axle housing 1 for automobiles of a banjo type. And the spring seats 3, 3 are formed on the upper surface 1a of the rear axle housing 1, so that the springs (not shown) mounted on the spring seats 3, 3 can be mounted on the vehicle body. Rear axle housings 1 and 4 correspond to the spring seats 3 and 3, respectively.
Spring mounting arms on the upper surface 1a of the
Reference numeral 5 denotes an arm for mounting the torque rod, which is provided on the lower surface 1b of the rear axle housing 1.
【００１１】上記構成になるリヤアクスルハウジング１
の疲れ強さを向上させるために、本発明では前記アクス
ルパイプ２、２の下面を支点６、６上に載置した状態で
下方に向う荷重Ｐを前記スプリングシート３、３に加え
ることにより、この荷重Ｐを曲げ外力として機能させて
リヤアクスルハウジング１の下面１ｂに引張応力を与え
ている。The rear axle housing 1 having the above structure
In order to improve the fatigue strength of the above, in the present invention, by applying a downward load P to the spring seats 3 and 3 with the lower surfaces of the axle pipes 2 and 2 placed on the fulcrums 6 and 6, This load P is made to function as a bending external force to apply tensile stress to the lower surface 1b of the rear axle housing 1.
【００１２】そして、このようにして引張応力が与えら
れたリヤアクスルハウジング１の下面１ｂにショットピ
ーニングを施して表面硬化を行なわせるようにしてい
る。７、７は噴射されるショットである。The lower surface 1b of the rear axle housing 1 thus subjected to the tensile stress is shot peened to harden the surface. 7 and 7 are shots to be jetted.
【００１３】すなわち、リヤアクスルハウジング１の下
面１ｂに引張応力を与えた状態でこの下面１ｂにショッ
トピーニングを施すようにしているために、リヤアクス
ルハウジング１の下面１ｂの表面層がショット７、７と
の衝突によって塑性変形を受ける。このために、ショッ
トピーニングの終了にともなって外力Ｐを除去（除荷）
すると、このリヤアクスルハウジング１の下面１ｂに大
きな圧縮応力が残されることになる。That is, since the lower surface 1b of the rear axle housing 1 is subjected to shot peening in a state where tensile stress is applied to the lower surface 1b, the surface layer of the lower surface 1b of the rear axle housing 1 is formed with the shots 7 and 7. It receives plastic deformation due to collision. For this reason, the external force P is removed (unloading) at the end of shot peening.
Then, a large compressive stress remains on the lower surface 1b of the rear axle housing 1.
【００１４】従って、このようにして強化されたリヤア
クスルハウジング１を組付けた自動車においては、車両
重量によってリヤアクスルハウジング１の下面１ｂに引
張応力が加わり、かつ、走行にともなってこの下面１ｂ
に動的応力を受けたとしても、前記車重等による引張応
力が前記圧縮残留応力で効果的にキャンセルされること
になり、リヤアクスルハウジング１の疲れ強さが一段と
高くなる。Therefore, in an automobile in which the rear axle housing 1 thus strengthened is assembled, tensile stress is applied to the lower surface 1b of the rear axle housing 1 due to the weight of the vehicle, and the lower surface 1b is accompanied by traveling.
Even when a dynamic stress is applied to the rear axle housing 1, the tensile stress due to the vehicle weight or the like is effectively canceled by the compressive residual stress, and the fatigue strength of the rear axle housing 1 is further increased.
【００１５】このために、リヤアクスルハウジング１の
重量の増加をともなうことなくその疲れ強さを高くする
ことができ、あるいは、疲れ強さを低下させることなく
リヤアクスルハウジング１を薄肉軽量化することができ
る。For this reason, the fatigue strength can be increased without increasing the weight of the rear axle housing 1, or the rear axle housing 1 can be made thin and lightweight without reducing the fatigue strength. ..
【００１６】また、リヤアクスルハウジング１の両端
（アクスルパイプ２、２）を支点としてスプリングシー
ト３、３に荷重を与えるようにしているために、ショッ
トピーニングを行なうに際して荷重Ｐを与えてリヤアク
スルハウジング１の下面１ｂに生じさせた引張応力の分
布状態を車重によりリヤアクスルハウジング１の下面１
ｂに発生する引張応力の分布状態と近似させることがで
きる。従って、他の部分を支点として荷重Ｐを加え、あ
るいは他の部分に荷重Ｐを加えてリヤアクスルハウジン
グ１の下面に引張応力を生じさせた場合に比較して、強
化により得られた圧縮残留応力の分布状態をより理想状
態に近づけることができ、過不足のない強化を経済的に
行なうことができる。Further, since the load is applied to the spring seats 3 and 3 with both ends (axle pipes 2 and 2) of the rear axle housing 1 as fulcrums, the load P is applied to the spring seats 3 and 3 when performing the shot peening. The distribution state of the tensile stress generated on the lower surface 1b depends on the vehicle weight and the lower surface 1 of the rear axle housing 1
It can be approximated to the distribution state of the tensile stress generated in b. Therefore, as compared with the case where the load P is applied with the other portion as a fulcrum or the load P is applied to the other portion to generate the tensile stress on the lower surface of the rear axle housing 1, the compressive residual stress obtained by the reinforcement is reduced. It is possible to bring the distribution state closer to the ideal state, and it is possible to economically strengthen just enough.
【００１７】[0017]
【発明の効果】以上の説明から明らかなように本発明に
よれば、加工効率の悪い調質を行なうことなく必要性の
ある部分のみを効率的に強化することができるために、
重量の増加をともなうことなくリヤアクスルハウジング
の疲れ強さを大幅に向上させることができ、あるいは、
リヤアクスルハウジングを薄肉軽量化して自動車の車体
重量を軽減することができる。As is apparent from the above description, according to the present invention, it is possible to efficiently strengthen only a necessary portion without performing heat treatment with poor machining efficiency.
The fatigue strength of the rear axle housing can be significantly improved without increasing the weight, or
By reducing the thickness and weight of the rear axle housing, the weight of the vehicle body can be reduced.
【図１】本発明に係る自動車用リヤアクスルハウジング
の強化方法による加工状況の一例を示した概略正面図で
ある。FIG. 1 is a schematic front view showing an example of a processing state by a method for strengthening a rear axle housing for an automobile according to the present invention.
１ リヤアクスルハウジング １ａ 上面 １ｂ 下面 ２ アクスルパイプ ３ スプリングシート ６ 支点 ７ ショット Ｐ 荷重 1 Rear axle housing 1a Upper surface 1b Lower surface 2 Axle pipe 3 Spring seat 6 Support point 7 Shot P Load
Claims (1)
を支点とし、該リヤアクスルハウジングの上面に設けた
スプリングシートに圧縮荷重を加えてリヤアクスルハウ
ジングの下面に引張応力を与えつつ、このリヤアクスル
ハウジングの下面にショットピーニングを施すことを特
徴とする自動車用リヤアクスルハウジングの強化方法。1. A rear end of a rear axle housing for automobiles is provided with a fulcrum as a fulcrum, a compressive load is applied to a spring seat provided on the upper face of the rear axle housing to apply tensile stress to the lower face of the rear axle housing, and the shot peening is applied to the lower face of the rear axle housing. A method for strengthening a rear axle housing for an automobile, which comprises:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3268400A JP2748060B2 (en) | 1991-09-19 | 1991-09-19 | Strengthening method of rear axle housing for automobile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3268400A JP2748060B2 (en) | 1991-09-19 | 1991-09-19 | Strengthening method of rear axle housing for automobile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0578739A true JPH0578739A (en) | 1993-03-30 |
| JP2748060B2 JP2748060B2 (en) | 1998-05-06 |
Family
ID=17457953
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3268400A Expired - Lifetime JP2748060B2 (en) | 1991-09-19 | 1991-09-19 | Strengthening method of rear axle housing for automobile |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2748060B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001477A (en) * | 2001-06-19 | 2003-01-08 | Nippon Steel Corp | Steel column base part and reinforcing method therefor |
| JP2003001476A (en) * | 2001-06-19 | 2003-01-08 | Nippon Steel Corp | Steel column base part and reinforcing method therefor |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101817289B (en) * | 2010-05-12 | 2013-09-04 | 江西江铃底盘股份有限公司 | Connecting structure of automotive driven rear axle housing assembly |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5924543A (en) * | 1982-07-31 | 1984-02-08 | Hino Motors Ltd | Manufacture of rear axle housing |
| JPH03122213A (en) * | 1989-10-05 | 1991-05-24 | Nippon Steel Corp | Under-tension shot peening method for extremely fine steel wire |
-
1991
- 1991-09-19 JP JP3268400A patent/JP2748060B2/en not_active Expired - Lifetime
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5924543A (en) * | 1982-07-31 | 1984-02-08 | Hino Motors Ltd | Manufacture of rear axle housing |
| JPH03122213A (en) * | 1989-10-05 | 1991-05-24 | Nippon Steel Corp | Under-tension shot peening method for extremely fine steel wire |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003001477A (en) * | 2001-06-19 | 2003-01-08 | Nippon Steel Corp | Steel column base part and reinforcing method therefor |
| JP2003001476A (en) * | 2001-06-19 | 2003-01-08 | Nippon Steel Corp | Steel column base part and reinforcing method therefor |
| JP4537622B2 (en) * | 2001-06-19 | 2010-09-01 | 新日本製鐵株式会社 | Steel tube column base and method for strengthening steel tube column base |
| JP4537621B2 (en) * | 2001-06-19 | 2010-09-01 | 新日本製鐵株式会社 | Steel tube column base and method for strengthening steel tube column base |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2748060B2 (en) | 1998-05-06 |
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