JPS60152667A - Surface hardening treatment of metallic hoop for transmission belt - Google Patents

Surface hardening treatment of metallic hoop for transmission belt

Info

Publication number
JPS60152667A
JPS60152667A JP1072084A JP1072084A JPS60152667A JP S60152667 A JPS60152667 A JP S60152667A JP 1072084 A JP1072084 A JP 1072084A JP 1072084 A JP1072084 A JP 1072084A JP S60152667 A JPS60152667 A JP S60152667A
Authority
JP
Japan
Prior art keywords
metal hoop
circumferential surface
hoops
hoop
hardening treatment
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
Application number
JP1072084A
Other languages
Japanese (ja)
Other versions
JPH0515783B2 (en
Inventor
Akio Fukui
昭夫 福井
Masahiro Ogawa
正宏 小川
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.)
Toyota Motor Corp
Original Assignee
Toyota 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 Toyota Motor Corp filed Critical Toyota Motor Corp
Priority to JP1072084A priority Critical patent/JPS60152667A/en
Publication of JPS60152667A publication Critical patent/JPS60152667A/en
Publication of JPH0515783B2 publication Critical patent/JPH0515783B2/ja
Granted legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
    • C23C8/04—Treatment of selected surface areas, e.g. using masks
    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G5/00—V-belts, i.e. belts of tapered cross-section
    • F16G5/16—V-belts, i.e. belts of tapered cross-section consisting of several parts
    • F16G5/163—V-belts, i.e. belts of tapered cross-section consisting of several parts with means allowing lubrication

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Solid-Phase Diffusion Into Metallic Material Surfaces (AREA)

Abstract

PURPOSE:To improve durability of a transmission belt which is formed of endless metallic hoops and blocks provided along said hoops by subjecting the outside circumferential surface of the hoops more to surface hardening treatment than the inside circumferential surface thereof. CONSTITUTION:Metallic hoops 10 of a transmission belt 12 constituted of the belts 10 and metallic or ceramic blocks 26 provided along the upper and lower parts thereof are subjected to surface hardening treatment to have higher durability. The hoops 10 are placed on a holding member 48 and a masking material 50 is brought into tight contact with the inside circumferential surface thereof then the hoops are subjected to gas soft nitriding treatment. Through-holes or grooves may be provided to the masking material. The outside circumferential surface of the hoops 10 is soft-nitrided over the entire surface as a result of the gas soft nitriding treatment. The inside circumferential surface thereof is soft- nitrided in the smaller area. The residual compressive stress is eventually generated in the outside circumferential surface by which the fatigue strength is improved and the durability of the belt 12 is improved.

Description

【発明の詳細な説明】 技術分野 本発明は伝導ベルトに用いられる金属フープの表面硬化
処理方法に関し、特にその金属フープすなわち伝導ベル
トの耐久性を向上させる技術に関するものである。DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a method for surface hardening a metal hoop used in a conductive belt, and more particularly to a technique for improving the durability of the metal hoop, that is, the conductive belt.

従来技術 無端帯状の金属フープとその金属フープに沿って重ねら
れたブロックとを備えた伝導ベルトが知られている。こ
の伝導ベルトは一般に一対のＶプーリに巻き掛けられて
動力を伝達するものであり、たとえば一対の有効径が可
変の可変プーリを備えた車両用無段変速機に用いられて
エンジンの回転を無段階に変速して伝達する。上記金属
フープは、伝導ベルトの直線部分においてはブロックを
直線的に保持し、伝導ベルトの同曲部においてはブロッ
クをプーリのＶ溝内に押し付けることを主たる目的とし
て備えられたものであるが、伝導ベルトの回転に伴って
繰り返し同曲させられるので、その耐久性すなわち疲労
強度を向上させるためにその表面にガス軟窒化処理、タ
フトライド処理等の拡散浸透による表面硬化処理が施さ
れるのが一般的である。BACKGROUND OF THE INVENTION A conductive belt is known that includes an endless metal hoop and blocks stacked along the metal hoop. This transmission belt is generally wound around a pair of V-pulleys to transmit power, and is used, for example, in a continuously variable transmission for vehicles equipped with a pair of variable pulleys with variable effective diameters to control engine rotation. Transmission is performed by changing gears in stages. The main purpose of the metal hoop is to hold the block linearly in the straight portion of the conduction belt, and to press the block into the V-groove of the pulley in the curved portion of the conduction belt. As the conduction belt is repeatedly bent in the same direction as it rotates, its surface is generally hardened by diffusion, such as gas nitrocarburizing or tuftriding, in order to improve its durability or fatigue strength. It is true.

しかしながら、金属フープの内周面および外周面に表面
硬化処理がそれぞれ施されるとそれぞれ残留圧縮応力が
起用されることとなるが、金属フープは二つのブーり間
における直線状態とプーリに巻き付くときの同曲状態と
の間で繰り返し曲げられ、かつ伝導ベルトの回転状態に
おいてはフープに大きな引張応力が加えられるため、特
に同曲状態における金属フープの外周側表面には非常に
大きな引張応力が加えられることになる。このため、フ
ープが疲労破壊し易く、伝導ベルトの耐久性が充分に得
られないという問題があった。However, if surface hardening is applied to the inner and outer surfaces of the metal hoop, residual compressive stress will be applied to each, but the metal hoop will be in a straight line between the two bobbins and will wrap around the pulley. Since the metal hoop is repeatedly bent between the same curved state and a large tensile stress is applied to the hoop when the conductive belt is rotating, a very large tensile stress is applied to the outer peripheral surface of the metal hoop especially in the same curved state. It will be added. For this reason, there was a problem in that the hoop was susceptible to fatigue failure and the conductive belt did not have sufficient durability.

発明の目的 本発明は以上の事情を背景として為されたものであり、
その目的とするところは、伝導ベルトの充分な耐久性が
得られる金属フープ表面硬化処理方法を提供することに
ある。Purpose of the Invention The present invention has been made against the background of the above circumstances,
The object thereof is to provide a method for surface hardening a metal hoop, which provides sufficient durability of a conductive belt.

発明の構成 斯る目的を達成するため、本発明の要旨とするところは
、前記金属フープに拡散浸透による表面硬化処理をする
に際し、その金属フープの内周面に全面的な、或いは所
定の面積比率のマスキングを施し、もってその金属フー
プの外周面における拡散量が内周面における拡散量より
も多くなるようにしたことにある。Structure of the Invention In order to achieve the above object, the gist of the present invention is to apply surface hardening treatment to the metal hoop by diffusion and penetration, and to apply a surface hardening treatment to the inner peripheral surface of the metal hoop, either on the entire surface or in a predetermined area. The purpose is to perform ratio masking so that the amount of diffusion on the outer peripheral surface of the metal hoop is greater than the amount of diffusion on the inner peripheral surface.

発明の効果 このようにすれば、金属フープ外周面の拡散量が金属フ
ープ内周面の拡散量よりも多くなるように表面硬化処理
が行われるので、金属フープ内周面に対して大きな圧縮
残留応力が金属フープ外周面に発生する。このため、金
属フープ外周面において伝導ベルトの作動時に加えられ
る極めて大きな引張応力に対向して圧縮残留応力が作用
し、金属フープ外周面における破断が防止される一方、
伝導ベルトがプーリに巻き掛けられた状態においては金
属フープの内周側に引張応力が発生するので、伝導ベル
トの作動状態において金属フープの外周側および内周側
における最大応力が小さくされ、金属フープの疲労破壊
が大幅に改善される。Effects of the Invention With this method, the surface hardening treatment is performed so that the amount of diffusion on the outer circumferential surface of the metal hoop is greater than the amount of diffusion on the inner circumferential surface of the metal hoop, so there is no large compression residue on the inner circumferential surface of the metal hoop. Stress is generated on the outer circumferential surface of the metal hoop. Therefore, compressive residual stress acts on the outer peripheral surface of the metal hoop in opposition to the extremely large tensile stress that is applied during operation of the conductive belt, and while the outer peripheral surface of the metal hoop is prevented from breaking,
When the conduction belt is wound around the pulley, tensile stress is generated on the inner circumference of the metal hoop, so when the conduction belt is in operation, the maximum stress on the outer and inner circumference of the metal hoop is reduced, and the metal hoop Fatigue fracture is significantly improved.

それ故、金属ベルトの耐久性が向上させられるのである
。Therefore, the durability of the metal belt is improved.

実施例 以下、本発明の一実施例を示す図面に基づいて詳細に説
明する。EXAMPLE Hereinafter, an example of the present invention will be described in detail based on the drawings.

第１図は本発明の表面硬化処理方法が適用された金属フ
ープ１０を備えた伝導ベルト１２の使用状態を示してお
り、伝導ベルト１２は図示しないベルト式無段変速機内
に備えられた一対の可変プーリ１４．１６に巻き掛けら
れている。可変プーリ１４，１６はそれぞれ相対向する
一対の円錐状の回転体１８，２０、および２２．２４か
ら構成されており、回転体１８と２０．２２と２４が軸
方向に相対的に接近・離隔させられることにより可変ブ
ーＵ１４，１６の有効径（伝導ベルト１２の掛り径）が
変更され、ベルト式無段変速機の変速比が変化させら・
れるようになっている。FIG. 1 shows the state in which a conduction belt 12 equipped with a metal hoop 10 to which the surface hardening treatment method of the present invention is applied is used. It is wound around variable pulleys 14 and 16. The variable pulleys 14, 16 are each composed of a pair of opposing conical rotating bodies 18, 20, and 22.24, and the rotating bodies 18, 20, 22, and 24 are moved relatively toward each other and away from each other in the axial direction. As a result, the effective diameter of the variable boos U14, 16 (the diameter of the transmission belt 12) is changed, and the gear ratio of the belt type continuously variable transmission is changed.
It is now possible to

伝導ベルト１２は、第２図にも詳しく示すように、無端
帯状の金属フープ１０と、その金属フープ１０に沿って
重ねられた金属製またはセラミック製等のブロック２６
とを備えている。金属フープ１０は単層または多層の無
端帯状であり、ブロック２６は、前記■溝の内壁面と係
合する一対の傾斜面を側面に備えた本体部２８と、本体
部２８の外周側に本体部２８と略同様の幅寸法を有する
頭部３０と、それ等本体部２８と頭部３０とを連結する
連結部３２とを有しており、その頭部３０と本体部２８
との間に形成された溝内に金属フープ１０が通されてい
る。As shown in detail in FIG. 2, the conductive belt 12 includes an endless band-shaped metal hoop 10 and blocks 26 made of metal or ceramic or the like stacked along the metal hoop 10.
It is equipped with The metal hoop 10 is in the shape of a single-layer or multi-layer endless strip, and the block 26 includes a main body 28 having a pair of inclined surfaces on its side surfaces that engage with the inner wall surface of the groove, and a main body on the outer peripheral side of the main body 28. It has a head 30 having substantially the same width dimension as the section 28 , and a connecting section 32 that connects the main body 28 and the head 30 .
A metal hoop 10 is passed through the groove formed between.

上記金属フープ１０には、たとえばガス軟窒化処理また
はタフトライド処理等の表面硬化処理により第３図のＡ
に示すように圧縮残留応力が発生させられている。この
ため、金属フープ１０は自由状態において比較的小さな
曲率で蔓巻状に多重に巻回されることとなるが、−重の
無端帯状に保持された状態では第３図の一点鎖線Ｂに示
すように外周側表面に圧縮応力が、内周側表面に引張応
力が生ずることとなる。この結果、金属フープ１０には
第３図Ｃに示すように上記ＡおよびＢが加えられた残留
応力分布が発生させられている。The metal hoop 10 is subjected to a surface hardening treatment such as a gas soft nitriding treatment or a tuftriding treatment as shown in FIG.
Compressive residual stress is generated as shown in . Therefore, in the free state, the metal hoop 10 is wound multiple times in a spiral shape with a relatively small curvature, but in the state held in the shape of a heavy endless band, it is shown by the dashed line B in FIG. In this way, compressive stress is generated on the outer peripheral surface and tensile stress is generated on the inner peripheral surface. As a result, a residual stress distribution in which the above A and B are applied is generated in the metal hoop 10 as shown in FIG. 3C.

このような金属フープ１０の外周側表面においては、外
周側表面および内周側表面にそれぞれ表面硬化処理が施
された従来のフープ、たとえば第４図のＤに示す残留応
力を備えた金属フープに対して外周側表面における最大
残留圧縮応力がΔσだけ大きくされる。なお、第３図お
よび第４図において金属フープ１０の厚みの左側が外周
面、右側が内周面を示す。それ故、金属フープ１０の外
周面に伝導ベルト１２の作動時における引張応力や金属
フープ１０が可変プーリ１４または１６に巻かれて同曲
状態とされたときの曲げに基づいてその表面に大きな引
張応力が得られても破断しにくくなる一方、金属フープ
１０の外周面に圧縮応力が発生させられかつ内周面に引
張応力が発生させられているので、金属フープ１０が可
変プーリ１４または１６に巻き掛けられて同曲部と可変
ブー１Ｊ１４，１６間の直線部とに繰り返し位置させら
れて曲げ運動が強制される際、その外周面および内周面
における最大応力が小さくされるため、第５図の実線に
示すように、点線に示す従来の金属フープ（両面窒化処
理したもの）に比較して金属フープ１０の耐久性が大幅
に向上させられるのである。したがって、伝導ベルト１
２の寿命が大幅に改善される。The outer circumferential surface of such a metal hoop 10 is different from a conventional hoop in which the outer circumferential surface and the inner circumferential surface are each subjected to surface hardening treatment, for example, a metal hoop with residual stress shown in D in FIG. 4. On the other hand, the maximum residual compressive stress on the outer peripheral surface is increased by Δσ. In addition, in FIG. 3 and FIG. 4, the left side of the thickness of the metal hoop 10 shows the outer circumferential surface, and the right side shows the inner circumferential surface. Therefore, there is a large tensile stress on the outer peripheral surface of the metal hoop 10 due to the tensile stress during operation of the conductive belt 12 and the bending when the metal hoop 10 is wound around the variable pulley 14 or 16 and brought into the same bending state. Although the metal hoop 10 is difficult to break even if stress is obtained, compressive stress is generated on the outer circumferential surface of the metal hoop 10 and tensile stress is generated on the inner circumferential surface, so that the metal hoop 10 is not easily ruptured by the variable pulley 14 or 16. When the bending movement is forced by being wrapped around the curved part and the straight part between the variable boos 1J14 and 16, the maximum stress on the outer peripheral surface and the inner peripheral surface is reduced. As shown by the solid line in the figure, the durability of the metal hoop 10 is significantly improved compared to the conventional metal hoop (which is nitrided on both sides) shown by the dotted line. Therefore, the conduction belt 1
2's lifespan is significantly improved.

ここで、第５図の実験結果は以下の実験条件下において
得られたものである。すなわち、第６図に示すように、
金属フープ１０が大径（駆動）ローラ３４および小径ロ
ーラ３６に巻き掛けられた状態で、それ等ローラ３４．
３６間を引き離す方向に一定の荷重Ｗを与えて金属フー
プ１０に実働状態と同様の一定の引張応力を与えつつ、
大径ローラ３４を矢印方向に駆動し、これによって第７
図に示すような応力を金属フープ１０の外周面に繰り返
し付与したものである。この結果、第５図のＳ−Ｎ線図
のＤに示すように、たとえば１５ｋｇｆ／ｉｎ２程度の
疲労強度向上効果が得られた。本試験は、一定の引張荷
重下における所謂回転曲げ疲れ試験に相当するものであ
る。Here, the experimental results shown in FIG. 5 were obtained under the following experimental conditions. That is, as shown in Figure 6,
With the metal hoop 10 wrapped around the large diameter (drive) roller 34 and the small diameter roller 36, the metal hoop 10 is moved around the large diameter (drive) roller 34 and the small diameter roller 36.
While applying a constant load W in the direction of separating the metal hoops 10 and applying a constant tensile stress similar to that in the actual working state,
The large diameter roller 34 is driven in the direction of the arrow.
Stress as shown in the figure is repeatedly applied to the outer peripheral surface of the metal hoop 10. As a result, as shown by D in the S-N diagram in FIG. 5, an effect of improving fatigue strength of, for example, about 15 kgf/in2 was obtained. This test corresponds to a so-called rotary bending fatigue test under a constant tensile load.

上記金属フープ１０はたとえば第８図に示す装置によっ
て表面硬化処理が行われ、その結果外周面に圧縮残留応
力が、内周面に引張残留応力が発生させられている。す
なわち、図において４０はガス式軟窒化炉であり、その
チャンバ４２内には金属フープ１０を保持するための治
具装置４４が配置されている。冶具装置４４は支柱４６
とこれに固定された複数対の円環状の保持部材４８およ
びマスキング部材５０とを備えている。第９図にも詳し
く説明するように、上記保持部材４８は板状を成しその
上面において金属フープ１０の下側端縁を支持する一方
、前記マスキング部材５０は保持部材４８に対して同心
状に固定され金属フープ１０の内周面に密着する外周面
を備えている。The metal hoop 10 is subjected to a surface hardening treatment using, for example, an apparatus shown in FIG. 8, and as a result, compressive residual stress is generated on the outer circumferential surface and tensile residual stress is generated on the inner circumferential surface. That is, in the figure, 40 is a gas-type soft nitriding furnace, and a jig device 44 for holding the metal hoop 10 is arranged in a chamber 42 of the furnace. The jig device 44 is a support 46
and a plurality of pairs of annular holding members 48 and masking members 50 fixed thereto. As explained in detail in FIG. 9, the holding member 48 has a plate shape and supports the lower edge of the metal hoop 10 on its upper surface, while the masking member 50 is concentric with the holding member 48. The metal hoop 10 has an outer circumferential surface that is fixed to the inner circumferential surface of the metal hoop 10.

金属フープ１０は、第９図に示すように、その内周面が
全面的にマスキング部材５０外周面に密着した状態で治
具装置４４に複数保持されてガス式軟窒化炉４０のチャ
ンバ４２内に配設される。As shown in FIG. 9, a plurality of metal hoops 10 are held in a jig device 44 with their inner circumferential surfaces fully in close contact with the outer circumferential surface of the masking member 50, and are inserted into the chamber 42 of the gas soft-nitriding furnace 40. will be placed in

次いでチャンバ４２内の処理温度をたとえば５７０℃程
度に保ちつつたとえば吸熱型浸炭氏姓ガス５０％および
ＮＨ３５０％の混合ガス、または尿素を分解させて得ら
れた生成ＣＯおよび発生期窒素の混合ガスがチャンバ４
２内に導かれたとえば１．５〜２時間この状態が保持さ
れると、金属フープ１０の表面においてガス軟窒化処理
が施される。Next, while maintaining the processing temperature in the chamber 42 at about 570° C., for example, a mixed gas of 50% endothermic carburizing gas and 350% NH, or a mixed gas of CO obtained by decomposing urea and nascent nitrogen is used. chamber 4
When the metal hoop 10 is introduced into the metal hoop 10 and maintained in this state for, for example, 1.5 to 2 hours, the surface of the metal hoop 10 is subjected to gas nitrocarburizing treatment.

このとき金属フープ１０の内周面とマスキング部材５０
の外周面とはほぼ全面的に密着させられているので、金
属フープ１０の内周面の軟窒化が阻止されるのである。At this time, the inner peripheral surface of the metal hoop 10 and the masking member 50
Since the outer circumferential surface of the metal hoop 10 is in close contact with the outer circumferential surface of the metal hoop 10 almost entirely, nitrocarburizing of the inner circumferential surface of the metal hoop 10 is prevented.

この結果、金属フープ１０を構成する鋼中に窒素が侵入
させられ、金属フープ１０の外周側表面組織の格子に歪
が生ずる結果、表面が硬化させられるとともに第３図の
Ａに示すような残留圧縮応力が発生させられるのである
。As a result, nitrogen penetrates into the steel constituting the metal hoop 10, causing distortion in the lattice of the outer peripheral surface structure of the metal hoop 10. As a result, the surface is hardened and a residue as shown in A in FIG. 3 is generated. Compressive stress is generated.

次に、本発明の他の実施例を説明する。Next, another embodiment of the present invention will be described.

前記治具装置４４におけるマスキング部材５０は金属フ
ープ１０の内周側表面を全面的に覆うものであるが、第
１０図または第１１図に示すマスキング部材５２．５４
が用いられることにより、第１２図および第１３図に示
すように、金属フープ１０の内周側表面が部分的に所定
の面積比率で窒化処理されるようにしても良いのである
。第１０図のマスキング部材５２にはその半径方向に貫
通する貫通孔５６が多数形成され、金属フープ１０の内
周面においてその貫通孔５６を通して露出する面積５７
のみが窒化処理されるようにするのである。また、第１
１図に示すマスキング部材５０ ４においてはその外周面に互いに交差する多数の溝５８
が形成されることにより、金属フープ１０の内周面に所
定の面積比率で密着する多数の角状突起６０が形成され
、金属フープ１０の内周面においてその角状突起６０に
密着する部分が窒化処理を受けないようにし、内周面の
うち溝５８に対応する面積６２のみ窒化処理されるよう
にするのである。The masking member 50 in the jig device 44 completely covers the inner surface of the metal hoop 10, and the masking members 52 and 54 shown in FIG. 10 or 11 are
As shown in FIGS. 12 and 13, the inner surface of the metal hoop 10 may be partially nitrided at a predetermined area ratio. A large number of through holes 56 are formed in the masking member 52 in FIG.
Only the nitriding process is performed. Also, the first
The masking member 504 shown in FIG. 1 has a large number of grooves 58 intersecting each other on its outer peripheral surface
As a result, a large number of angular protrusions 60 are formed that are in close contact with the inner circumferential surface of the metal hoop 10 at a predetermined area ratio, and the portions of the inner circumferential surface of the metal hoop 10 that are in close contact with the angular protrusions 60 are formed. The nitriding process is not performed, and only the area 62 of the inner circumferential surface corresponding to the groove 58 is nitrided.

上記実施例によれば金属フープ１０の外周面がその内周
面に比較して全面的に窒化処理されて残留圧縮応力が高
められているので、前述の実施例と同様の効果が得られ
るのに加えて、内周面の一部の面積５７．６２が所定の
面積比率で窒化処理されているので金属ブロック２６と
の摩擦による摩耗が抑制され、金属フープ１０の耐久性
が一層高められる利点がある。なお、第１２図および第
１３図の金属フープ１０の内周面における窒化面積形状
に限定されるものではなく、所定の面積比率で窒化され
ておれば良いのである。According to the above embodiment, the outer circumferential surface of the metal hoop 10 is completely nitrided and the residual compressive stress is increased compared to the inner circumferential surface thereof, so that the same effect as in the above embodiment can be obtained. In addition, since a part of the area 57.62 of the inner peripheral surface is nitrided at a predetermined area ratio, wear due to friction with the metal block 26 is suppressed, and the durability of the metal hoop 10 is further enhanced. There is. Note that the shape of the nitrided area on the inner circumferential surface of the metal hoop 10 shown in FIGS. 12 and 13 is not limited, and it is sufficient that the nitrided area is nitrided at a predetermined area ratio.

前述の実施例における金属フープ１０に対する１ 表面硬化処理は、ガス軟窒化処理法が取られているが、
その処理は液相または固相によるものでも良く、また浸
炭処理等信の表面硬化処理法でも良いのである。要する
に拡散浸透による表面硬化処理により残留圧縮応力が形
成される処理方法であれば良いのである。1. The surface hardening treatment for the metal hoop 10 in the above-mentioned embodiment is a gas soft nitriding treatment method.
The treatment may be in a liquid phase or a solid phase, or may be a surface hardening treatment such as carburization. In short, any treatment method may be used as long as residual compressive stress is generated by surface hardening treatment by diffusion and osmosis.

また、前述の実施例において金属フープ１０の内周面を
部分的に表面硬化処理するために、マスキング部材５２
．５４が用いられているが、金属フープ１０の内周面の
窒化処理を施さない部分面積に予め銅メッキ、ニッケル
メッキ、錫メッキ等のマスキング用メッキ層を形成し、
部分的または全面的に窒化処理が施されるようにしても
良いのである。In addition, in the above-described embodiment, the masking member 52 is used to partially harden the inner peripheral surface of the metal hoop 10.
．． 54 is used, but a masking plating layer such as copper plating, nickel plating, tin plating, etc. is formed in advance on the partial area of the inner peripheral surface of the metal hoop 10 that is not subjected to nitriding treatment,
The nitriding treatment may be applied partially or completely.

なお、上述したのはあくまでも本発明の一実施例であり
、本発明はその精神を逸脱しない範囲において種々変更
が加えられ得るものである。The above-mentioned embodiment is merely one embodiment of the present invention, and various modifications may be made to the present invention without departing from the spirit thereof.

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

第１図は本発明が通用された金属フープを含む伝導ベル
トがブーりに巻き掛けられた状態を示す２ 斜視図である。第２図は第１図の伝導ヘルドを説明する
要部斜視図である。第３図は第１図および第２図の実施
例に用いられる金属フープ内の応力分布を説明する図で
ある。第４図は従来の金属フープにおける第３図に相当
する図である。第５図は第３図の応力分布を備えた金属
フープの耐久性を説明する図である。第６図および第７
図は第５図のデータを得るために用いた実験条件をそれ
ぞれ説明する図である。第８図は金属フープに表面硬化
処理を施すための装置を示す図であり、第９図はその要
部を説明する斜視図である。第１０図および第１１図は
本発明の他の実施例におけるマスキング部材の一部を示
す斜視図である。第１２図および第１３図は第１θ図お
よび第１１図のマスキング部材を用いて表面硬化処理を
施した際の金属フープ内周面における表面硬化処理面積
形状を示す部分斜視図である。 １０：金属フープ　１２：伝導ベルト ２６：ブロツク ３ 第４図　第３図 （ｋｇ／ｒｒｌｒｒＩ２） 精返り口数（ＩｏｇＮ） 時　間 第８図 第９図 ０ 第１ｏ図　第１２図FIG. 1 is a perspective view showing a state in which a conductive belt including a metal hoop to which the present invention is applied is wound around a boob. FIG. 2 is a perspective view of a main part of the conduction heald shown in FIG. 1. FIG. 3 is a diagram illustrating the stress distribution within the metal hoop used in the embodiments of FIGS. 1 and 2. FIG. FIG. 4 is a diagram corresponding to FIG. 3 in a conventional metal hoop. FIG. 5 is a diagram illustrating the durability of a metal hoop having the stress distribution shown in FIG. 3. Figures 6 and 7
The figures are diagrams each explaining the experimental conditions used to obtain the data in FIG. 5. FIG. 8 is a diagram showing an apparatus for subjecting a metal hoop to surface hardening treatment, and FIG. 9 is a perspective view illustrating the main parts thereof. FIGS. 10 and 11 are perspective views showing a portion of a masking member in another embodiment of the present invention. FIGS. 12 and 13 are partial perspective views showing the shape of the surface hardening treatment area on the inner peripheral surface of the metal hoop when the masking member of FIG. 1θ and FIG. 11 is used to perform the surface hardening treatment. 10: Metal hoop 12: Conductive belt 26: Block 3 Fig. 4 Fig. 3 (kg/rrlrrI2) Number of recirculation openings (IogN) Time Fig. 8 Fig. 9 0 Fig. 1o Fig. 12

Claims (1)

【特許請求の範囲】 無端帯状の金属フープと該金属フープに沿って重ねられ
たブロックとを備えて動力を伝達する伝導ベルトの、該
金属フープ表面硬化処理方法であって、 前記金属フープに拡散浸透による表面硬化処理をするに
際し、該金属フープの内周面に全面的な或いは所定の面
積比率のマスキングを施し、もって該金属フープ外周面
における拡散量が内周面における拡散量よりも多くなる
ようにしたことを特徴とする伝導ベルト用金属フープの
表面硬化処理方法。[Claims] A method for surface hardening a metal hoop of a power transmission belt comprising an endless band-shaped metal hoop and blocks stacked along the metal hoop, comprising: When performing surface hardening treatment by infiltration, the inner circumferential surface of the metal hoop is masked entirely or at a predetermined area ratio, so that the amount of diffusion on the outer circumferential surface of the metal hoop is greater than the amount of diffusion on the inner circumferential surface. A method for surface hardening a metal hoop for a conductive belt, characterized in that:
JP1072084A 1984-01-23 1984-01-23 Surface hardening treatment of metallic hoop for transmission belt Granted JPS60152667A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1072084A JPS60152667A (en) 1984-01-23 1984-01-23 Surface hardening treatment of metallic hoop for transmission belt

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1072084A JPS60152667A (en) 1984-01-23 1984-01-23 Surface hardening treatment of metallic hoop for transmission belt

Publications (2)

Publication Number Publication Date
JPS60152667A true JPS60152667A (en) 1985-08-10
JPH0515783B2 JPH0515783B2 (en) 1993-03-02

Family

ID=11758122

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1072084A Granted JPS60152667A (en) 1984-01-23 1984-01-23 Surface hardening treatment of metallic hoop for transmission belt

Country Status (1)

Country Link
JP (1) JPS60152667A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6342396A (en) * 1986-08-04 1988-02-23 ユナイテッド・テクノロジ−ズ・コ−ポレイション Composite material article enhanced in fatigue strength

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6342396A (en) * 1986-08-04 1988-02-23 ユナイテッド・テクノロジ−ズ・コ−ポレイション Composite material article enhanced in fatigue strength

Also Published As

Publication number Publication date
JPH0515783B2 (en) 1993-03-02

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