JPH0670453B2 - V belt for high load transmission - Google Patents
V belt for high load transmissionInfo
- Publication number
- JPH0670453B2 JPH0670453B2 JP62312875A JP31287587A JPH0670453B2 JP H0670453 B2 JPH0670453 B2 JP H0670453B2 JP 62312875 A JP62312875 A JP 62312875A JP 31287587 A JP31287587 A JP 31287587A JP H0670453 B2 JPH0670453 B2 JP H0670453B2
- Authority
- JP
- Japan
- Prior art keywords
- belt
- block
- portions
- reinforcing member
- beam portion
- 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 - Fee Related
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
- 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
- F16G5/166—V-belts, i.e. belts of tapered cross-section consisting of several parts with non-metallic rings
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Automotive Seat Belt Assembly (AREA)
- Belt Conveyors (AREA)
Description
【発明の詳細な説明】 （産業上の利用分野） 本発明は、自動車等の無段変速装置に使用される高負荷
伝動用のＶベルトの改良技術に関するものである。Description: TECHNICAL FIELD The present invention relates to an improved technique for a V-belt for high load transmission used in a continuously variable transmission such as an automobile.
（従来の技術） 従来より、自動車あるいはコンバインやトラクタ等の農
業用機械等における変速装置としては、歯車式または流
体式のものが一般に広く使用されているが、近年、変速
時の操作性の向上、燃費の向上等を目的としてベルト式
無段変速装置の開発が進められている。(Prior Art) Conventionally, a gear type or a fluid type is generally widely used as a transmission in an automobile or a combine machine, an agricultural machine such as a tractor, etc., but in recent years, operability at the time of shifting has been improved. The development of a belt-type continuously variable transmission is underway for the purpose of improving fuel efficiency.
しかし、このベルト式無段変速装置に使用されるベルト
は極めて高いトルクの伝動能力を必要とし、従来の一般
的なゴム製のＶベルトでは高い側圧に耐えきれず、座屈
変形を生じて使用することができない。However, the belt used in this belt type continuously variable transmission requires an extremely high torque transmission capability, and conventional conventional V belts made of rubber cannot withstand a high lateral pressure and cause buckling deformation. Can not do it.
そこで、従来、斯かる要求を満足させるべく、各種の高
負荷伝動用ベルトが知られている（例えば特開昭46-486
1号、特開昭55-27595号、特開昭56-76745号、特開昭59-
77147号の各公報参照）。Therefore, conventionally, various high load transmission belts have been known in order to satisfy such demands (for example, JP-A-46-486).
1, JP-A-55-27595, JP-A-56-76745, JP-A-59-
See each publication of No. 77147).
また、本出願人にあっては、基本的に、エンドレスの１
対の張力帯と、左右外側面に該各張力帯が嵌合する嵌合
溝およびプーリのベルト溝面に当接する当接部を有する
多数のブロックとで構成され、上記張力帯の上下面およ
び各ブロックの嵌合溝の上下面にそれぞれ互いに対応し
て互いに係合可能な凹凸部を形成し、この張力帯と各ブ
ロックとの凹凸部を係合させて、各ブロックを張力帯に
対しベルト長手方向に係止固定してなるブロックベルト
と呼ばれる高負荷伝動用Ｖベルトを提案している（特開
昭60-49151号公報、特開昭61-206847号公報、特開昭62-
137445号公報参照）。In addition, the applicant is basically an endless 1
A pair of tension bands, and a large number of blocks each having a fitting groove on each of the left and right outer surfaces for fitting each tension band and an abutting portion that abuts on the belt groove surface of the pulley. Concave and convex portions that can be engaged with each other are formed on the upper and lower surfaces of the fitting groove of each block. A V-belt for high-load transmission called a block belt, which is locked and fixed in the longitudinal direction, has been proposed (JP-A-60-49151, JP-A-61-206847, JP-A-62-62).
(See Japanese Patent No. 137445).
（発明が解決しようとする課題） ところで、この種のブロックベルトにおいては、伝動可
能な負荷に関連するプーリ推力を各ブロックで受ける構
造であるので、該ブロックの強度を高めておかないと、
ブロック破壊に至る虞れがある。このため、各ブロック
の内部に補強部材を埋設することが行われているが、特
に極めて高いトルクを連続的に作用させた場合において
は、未だブロック強度、特に疲労強度が不足気味であ
り、改良の余地がある。(Problems to be solved by the invention) By the way, in this type of block belt, since each block receives a pulley thrust related to a load that can be transmitted, the strength of the block must be increased.
There is a risk of block destruction. For this reason, it has been carried out to embed a reinforcing member in the interior of each block, especially when a very high torque is continuously applied, the block strength, especially fatigue strength is still insufficient, There is room for
本発明は斯かる諸点に鑑みてなされたものであり、その
目的は、上記プーリ推力により各ブロックの補強部材に
発生する応力集中点のうち、疲労強度上問題となる引張
応力集中を、疲労強度上さほど問題とならない圧縮応力
集中部を新たに設けることで分散緩和することにより、
同荷重条件下における補強部材の最大引張集中応力値を
低減して、補強部材ひいてはブロックの疲労強度を高
め、ブロックの破壊に至るまでの時間を大幅に延長し、
ブロックベルトの高寿命化を図ることにある。The present invention has been made in view of these points, and an object thereof is to determine the tensile stress concentration, which is a problem in fatigue strength, among the stress concentration points generated in the reinforcing member of each block by the pulley thrust. By newly providing a compressive stress concentration part that does not pose a problem, dispersion relaxation is achieved,
The maximum tensile concentrated stress value of the reinforcing member under the same load condition is reduced, the fatigue strength of the reinforcing member and by extension the block is increased, and the time until the block is broken is significantly extended.
The purpose is to extend the life of the block belt.
（課題を解決するための手段） この目的の達成のため、本発明では、各ブロックにおい
てその本体内に埋設される補強部材を、ベルト幅方向に
延びる上側および下側ビーム部と該両ビーム部のベルト
幅方向中央部同士を上下に接続するセンターピラー部と
で構成し、その補強部材における上側ビーム部の上面両
端部に段差部を形成して、その段差部により圧縮応力集
中部を生じさせることで、補強部材の最大引張応力集中
部である上側ビーム部の根元での引張応力集中を緩和し
てその引張集中応力値を低減させるものである。(Means for Solving the Problem) In order to achieve this object, according to the present invention, a reinforcing member embedded in the main body of each block is provided with upper and lower beam portions extending in the belt width direction and the both beam portions. And a center pillar portion that vertically connects the belt width direction central portions to each other, and a step portion is formed at both end portions of the upper surface of the upper beam portion of the reinforcing member, and a compressive stress concentration portion is generated by the step portion. Thus, the tensile stress concentration at the root of the upper beam portion, which is the maximum tensile stress concentration portion of the reinforcing member, is relaxed and the tensile concentration stress value is reduced.
具体的に、本発明の解決手段は以下の構成要件を具備し
たＶベルトとしている。Specifically, the solution means of the present invention is a V-belt having the following constitutional requirements.
（１）上下面に各々上下に対応してベルト幅方向に延び
かつベルト長手方向に並んで形成された多数の係合部を
有し、内部に心線が埋設されたエンドレスの平ベルトか
らなる１対の張力帯を備える。(1) An endless flat belt having a plurality of engaging portions formed on the upper and lower surfaces in the belt width direction corresponding to the upper and lower sides and arranged side by side in the belt longitudinal direction, and having core wires embedded therein It comprises a pair of tension bands.
（２）本体内に、ベルト幅方向に延びる上側および下側
ビーム部と該両ビーム部のベルト幅方向中央部同士を上
下に接続するセンターピラー部とからなる１つの補強部
材が完全に埋め込まれてなる多数のブロックを備える。(2) One reinforcing member consisting of upper and lower beam portions extending in the belt width direction and a center pillar portion vertically connecting the belt width direction central portions of both beam portions is completely embedded in the main body. It is equipped with a large number of blocks.
（３）上記各ブロックは、その両外側面にそれぞれ形成
され上記各張力帯が脱着可能に嵌合する切欠き状の嵌合
溝と、該嵌合溝の上下面にそれぞれ形成され上記張力帯
上下面の係合部にそれぞれ係合する係止部と、両外側面
にそれぞれ形成されプーリのベルト溝面に当接する当接
部とを有する。(3) Each of the blocks has a notch-shaped fitting groove formed on both outer side surfaces thereof so that the tension bands are detachably fitted, and the tension band formed on the upper and lower surfaces of the fitting groove. It has a locking portion that engages with the engaging portion on the upper and lower surfaces, and a contact portion that is formed on both outer surfaces and that abuts on the belt groove surface of the pulley.
（４）上記張力帯の係合部と各ブロックの係止部との係
合により、各ブロックが１対の張力帯に対しベルト長手
方向に係止固定されてなるＶベルトである。(4) A V-belt in which each block is locked and fixed to a pair of tension bands in the belt longitudinal direction by the engagement of the engagement part of the tension band and the locking part of each block.
（５）そして、本発明の特徴として、上記各ブロックに
おける補強部材の上側ビーム部の上面両端部には、ビー
ム部上下幅が両端に向かって段差状に減少変化し、ベル
トのプーリへの係合時に上記張力帯から各ブロックに作
用するプーリ中心に向かう方向の押付け力により上側ビ
ーム部の両端部をその根元よりも上方に撓み変形しやす
くかつその際に上側ビーム部の上面に発生する圧縮応力
を集中させる段差部が形成されている。(5) As a feature of the present invention, the upper and lower end portions of the upper beam portion of the reinforcing member in each of the blocks have the vertical width of the beam portion that decreases in a stepwise manner toward both ends, and the belt is engaged with the pulley. At the same time, the pressing force in the direction from the tension band acting on each block toward the pulley center causes both ends of the upper beam portion to be easily bent and deformed above the root thereof, and the compression generated on the upper surface of the upper beam portion at that time. A stepped portion that concentrates stress is formed.
（作用） この構成により、本発明では、Ｖベルトがプーリのベル
ト溝面に係合して負荷を伝動している状態では、各ブロ
ックは、張力帯によりブロック上面から下面に向かう方
向、つまりプーリ中心に向かう方向に押付け力を受け
る。この押付け力により、上記ブロックに埋設された補
強部材はプーリのベルト溝間にあってその上側及び下側
ビーム部がセンターピラー部との接続部を中心として両
側において上方へ撓み変形しようとする挙動を示し、そ
のうち特に上側ビーム部におけるセンターピラー部との
接続部下面である根元が疲労強度上問題となる最大引張
応力集中部となる。(Operation) With this configuration, in the present invention, in a state in which the V-belt is engaged with the belt groove surface of the pulley to transmit the load, each block moves in the direction from the block upper surface to the lower surface by the tension band, that is, the pulley. It receives pressing force in the direction toward the center. Due to this pressing force, the reinforcing member embedded in the above block is located between the belt grooves of the pulley, and its upper and lower beam parts show a behavior of bending and deforming upward on both sides around the connection part with the center pillar part. Of these, the root, which is the lower surface of the connection portion with the center pillar portion in the upper beam portion, becomes the maximum tensile stress concentration portion which causes a problem in fatigue strength.
そして、かかる応力集中状態において、上記補強部材の
上側ビーム部の上面両端部にビーム部上下幅が段差状に
減少変化する段差部が形成されているので、該段差部に
より、上記押付け力で上側ビーム部の両端部がその根元
よりも上方に撓み変形しやすくなり、上側ビーム部の上
面に発生する圧縮応力が上記段差部に集中することとな
る。この疲労強度上さほど問題とならない圧縮応力集中
部の新たな形成により、上側ビーム部の根元での上方撓
み変形が低減し、上記根元での最大引張応力集中が緩和
され、その最大引張応力値が低減される。その結果、補
強部材ひいてはブロックの疲労強度が高まり、よって極
めて高いトルクを連続的に作用させた場合であっても、
ブロック破壊を回避できるのである。Then, in such a stress concentration state, since a step portion whose vertical width of the beam portion is reduced and changed in a stepwise manner is formed at both end portions of the upper surface of the upper beam portion of the reinforcing member, the step portion causes the upper side of the upper beam portion to be moved upward by the pressing force. Both ends of the beam portion are easily bent and deformed upward from the root thereof, and the compressive stress generated on the upper surface of the upper beam portion is concentrated on the stepped portion. Due to the new formation of the compressive stress concentration part, which does not cause much problems in terms of fatigue strength, upward bending deformation at the root of the upper beam part is reduced, the maximum tensile stress concentration at the root is relaxed, and the maximum tensile stress value is Will be reduced. As a result, the fatigue strength of the reinforcing member and thus of the block is increased, so that even when a very high torque is continuously applied,
You can avoid block destruction.
（実施例） 以下、本発明の実施例を図面に基づいて説明する。(Example) Hereinafter, the Example of this invention is described based on drawing.
第４図〜第６図は本発明の実施例に係るＶベルトＡを示
す。このＶベルトＡは、保形層1bの内部に複数の心線1
a,1a,…（心体）が平行に配置されて埋設されたゴム等
からなる左右１対のエンドレスの張力帯1,1と、左右外
側部に上記各張力帯１が幅方向外側から着脱可能に嵌合
する切欠き状の嵌合溝2,2を有するとともに、左右外側
面に図外のプーリのベルト溝面に当接する当接部3,3を
有する多数のブロック4,4,…とからなり、各ブロック４
の嵌合溝2,2にそれぞれ張力帯1,1を嵌合せしめて該ブロ
ック4,4,…をベルト長手方向に連続的に固定したもので
ある。4 to 6 show a V-belt A according to an embodiment of the present invention. This V-belt A has a plurality of core wires 1 inside the shape-retaining layer 1b.
A pair of left and right endless tension bands 1 and 1 made of rubber or the like in which a, 1a, ... A large number of blocks 4, 4, ... Having notch-shaped fitting grooves 2, 2 that fit as much as possible, and abutting parts 3, 3 that come into contact with the belt groove surface of a pulley (not shown) on the left and right outer surfaces. And each block 4
, And the tension bands 1, 1 are fitted into the fitting grooves 2, 2, respectively, and the blocks 4, 4, ... Are continuously fixed in the belt longitudinal direction.
すなわち、このＶベルトＡにおいて、各張力帯１の上面
には各ブロック４に対応してその幅方向に延びる一定ピ
ッチの係合部としての凹溝5,5,…が、下面には上記凹溝
5,5,…に対応してその幅方向に延びる一定ピッチの係合
部としての凹溝6,6,…がそれぞれ形成されている。一
方、各ブロック４の嵌合溝２上壁面には上記張力帯１上
面の各凹溝５に係合する係止部としての凸条７が、嵌合
溝２の下壁面には張力帯１下面の各凹溝６に係合する係
止部としての凸条８がそれぞれ形成されており、この各
ブロック４の凸条7,8をそれぞれ張力帯１の凹溝5,6に係
合せしめて該ブロック4,4,…をベルト長手方向に係止固
定するようになされている。That is, in the V-belt A, the upper surface of each tension band 1 is provided with concave grooves 5, 5, ... As engaging portions of a constant pitch extending in the width direction corresponding to the respective blocks 4, and the lower surface is formed with the above concave parts. groove
Corresponding to 5, 5, ..., Recessed grooves 6, 6, .. On the other hand, on the upper wall surface of the fitting groove 2 of each block 4, there is a ridge 7 as a locking portion that engages with each concave groove 5 on the upper surface of the tension band 1, and on the lower wall surface of the fitting groove 2 is the tension band 1. Protruding strips 8 are formed as engaging portions that engage with the respective recessed grooves 6 on the lower surface. The protrusions 7 and 8 of each block 4 are engaged with the recessed grooves 5 and 6 of the tension band 1 respectively. The blocks 4, 4, ... Are locked and fixed in the belt longitudinal direction.
上記各ブロック４は、第２図および第３図に示すよう
に、ブロック本体13と、該ブロック本体13内にその略中
央に位置するように完全に埋め込まれた１つの補強部材
９とからなる。そして、上記補強部材９は、第１図にも
示すように、ベルト幅方向（左右方向）に延びる上側お
よび下側ビーム部10,11と、該両ビーム部10,11の左右方
向中央同士を上下に接続するセンターピラー部12とから
なっている。As shown in FIGS. 2 and 3, each block 4 comprises a block main body 13 and one reinforcing member 9 completely embedded in the block main body 13 so as to be located substantially in the center thereof. . As shown in FIG. 1, the reinforcing member 9 includes upper and lower beam portions 10 and 11 extending in the belt width direction (horizontal direction) and left and right center portions of the both beam portions 10 and 11. It is composed of a center pillar portion 12 connected to the top and bottom.
さらに、本発明の特徴として、上記補強部材９における
上側ビーム部10は、そのセンターピラー部12に対し上面
先端寄り部分において先端側に向かって上下幅寸法が所
定位置を境として急激に段差状に減少変化していて、こ
の上下幅寸法の変化部分により上側ビーム部10の上面両
端部に１対の段差部14,14が形成されており、この段差
部14,14により、ベルトＡのプーリへの係合時に上記張
力帯１から各ブロック４に作用するプーリ中心に向かう
方向の押付け力により上側ビーム部10の両端部をその根
元よりも上方に撓み変形しやすくかつその際に上側ビー
ム部10の上面に発生する圧縮応力を集中させるようにし
ている。Further, as a feature of the present invention, the upper beam portion 10 of the reinforcing member 9 is abruptly stepped from the center pillar portion 12 toward the tip end in the portion near the tip of the upper surface with the vertical width dimension being a predetermined position as a boundary. Due to the change in the vertical dimension, a pair of step portions 14 and 14 are formed at both ends of the upper surface of the upper beam portion 10. The step portions 14 and 14 allow the belt A pulley to reach the pulley. At the time of engagement, the pressing force in the direction from the tension band 1 acting on each block 4 toward the pulley center causes the both ends of the upper beam portion 10 to be easily bent and deformed above its root, and at that time, the upper beam portion 10 The compressive stress generated on the upper surface of the is concentrated.
したがって、上記実施例においては、ＶベルトＡがプー
リのベルト溝面に嵌合して負荷を伝動している状態で
は、第３図に示すように、各ブロック４は、張力帯1,1
によりブロック４上面から下面に向かう方向、つまりプ
ーリ中心に向かう方向に押付け力Frを受けることにな
る。この押付け力Frにより、第15図（ａ）及び（ｂ）に
示すように、上記ブロック４に埋設された補強部材９
は、プーリのベルト溝間にあって、その上側及び下側ビ
ーム部10,11がセンターピラー部12との接続部を中心と
して下方へ沈み込む、換言すれば該接続部を中心として
両側において上方へ撓み変形しようとする挙動を示す。
そして、この挙動により、上側及び下側ビーム部10,11
のセンターピラー部との接続部である根元（上側ビーム
部10にあっては下面コーナー部分、下側ビーム部11にあ
っては上面コーナー部分）が最大応力集中部となる。そ
のうち、上側ビーム部10の根元部分（センターピラー部
との接続部下面部分）が最大引張応力集中部15となり、
これが疲労強度問題となる。尚、下側ビーム部11の根元
部分（センターピラー部との接続部上面部分）は圧縮応
力集中部であるので、疲労強度上大きな問題とならな
い。Therefore, in the above embodiment, when the V-belt A is fitted in the belt groove surface of the pulley to transmit the load, as shown in FIG.
As a result, the pressing force F r is applied in the direction from the upper surface to the lower surface of the block 4, that is, in the direction toward the pulley center. Due to this pressing force F r , as shown in FIGS. 15 (a) and 15 (b), the reinforcing member 9 embedded in the block 4 is
Is between the belt grooves of the pulley, and the upper and lower beam portions 10 and 11 sink downward around the connection portion with the center pillar portion 12, in other words, bend upwards on both sides around the connection portion. It shows the behavior to be transformed.
Due to this behavior, the upper and lower beam portions 10, 11
A root (a lower surface corner portion in the upper beam portion 10 and an upper surface corner portion in the lower beam portion 11) which is a connection portion with the center pillar portion is the maximum stress concentration portion. Of these, the root portion of the upper beam portion 10 (the lower surface portion of the connection portion with the center pillar portion) becomes the maximum tensile stress concentration portion 15,
This becomes a fatigue strength problem. Since the root portion of the lower beam portion 11 (the upper surface portion of the connecting portion with the center pillar portion) is a compressive stress concentration portion, it does not cause a big problem in fatigue strength.
かかる応力集中状態において、上記上側ビーム部10の上
面両側部にビーム部上下幅が段差状に減少変化する段差
部14,14が形成されているので、第15図（ａ）に示すよ
うに、この段差部14,14により、上側ビーム部10の両端
部が上記押付け力Frでその根元よりも上方に撓み変形し
やすくなり、上側ビーム部10の上面に発生する圧縮応力
が上記段差部14,14に集中することになる。この圧縮応
力集中部（疲労強度上大きな問題とならない部分）の形
成により、上側ビーム部10の根元部分（最大引張応力集
中部15）での上方撓み変形が低減し、その撓み角δ（第
15図（ａ）参照）が従来の撓み角δ′（第15図（ｂ）参
照）よりも小さくなる。このことにより、上記最大引張
応力集中部15での応力集中が緩和され、その最大引張応
力値が低減される。その結果、補強部材９ひいてはブロ
ック４の疲労強度が高まることとなり、よって極めて高
いトルクが連続的に作用した場合であっても、ブロック
４の破壊を回避することができ、ブロック４の耐久性を
高めてベルトＡの寿命を延ばすことができる。In such a stress concentration state, since step portions 14 and 14 are formed on both sides of the upper surface of the upper beam portion 10 in which the vertical width of the beam portion is changed in a stepwise manner, as shown in FIG. 15 (a), Due to the step portions 14 and 14, both end portions of the upper beam portion 10 are easily bent and deformed above the root thereof by the pressing force F r , and the compressive stress generated on the upper surface of the upper beam portion 10 is increased. , 14 will be concentrated. By forming this compressive stress concentration portion (portion that does not cause a big problem in fatigue strength), upward bending deformation at the root portion of the upper beam portion 10 (maximum tensile stress concentration portion 15) is reduced, and its bending angle δ (first
15 (a)) becomes smaller than the conventional deflection angle δ '(see FIG. 15 (b)). This relaxes the stress concentration in the maximum tensile stress concentration portion 15 and reduces the maximum tensile stress value. As a result, the fatigue strength of the reinforcing member 9 and thus of the block 4 is increased. Therefore, even when extremely high torque is continuously applied, the block 4 can be prevented from being broken and the durability of the block 4 can be improved. The life of the belt A can be increased by increasing the height.
尚、各ブロック４は、第３図に示すように、張力帯1,1
によりベルト長手方向に剪断力Ftを受けている。この剪
断力について第16図により説明するに、走行中のＶベル
トＡは、プーリ巻付部分においては負荷トルクによりベ
ルト長手方向に張力が変化し、従動プーリ側ではベルト
進行方向に張力が増加し、駆動プーリ側ではベルト進行
方向に張力が減少する。このため、１つのブロック４に
ついてみると、そのベルト進行方向前後で張力差が生
じ、該ブロック４の左右の当接部3,3がプーリに対して
滑らないと仮定すると、上記張力差がブロック４に対す
る剪断力Ftとして働く。そして、この剪断力Ftにより、
ブロック４及び補強部材９はその平面視において幅方向
中央部が剪断力作用方向に凸となるように中凸状に曲げ
変形し、ブロック４（補強部材９）の剪断力作用方向前
側が引張応力側となり、後側が圧縮応力側となる。した
がって、従動プーリ側では、ブロック４（補強部材９）
のベルト進行方向前側が引張応力側で、後側が圧縮応力
側となり、逆に駆動プーリ側では、ブロック４（補強部
材９）のベルト進行方向前側が圧縮応力側で、後側が引
張応力側となる。Each block 4 has a tension band 1, 1 as shown in FIG.
Receives a shearing force F t in the longitudinal direction of the belt. This shearing force will be described with reference to FIG. 16. In the running V belt A, the tension changes in the belt longitudinal direction due to the load torque at the pulley winding portion, and the tension increases in the belt traveling direction at the driven pulley side. On the drive pulley side, the tension decreases in the belt traveling direction. Therefore, regarding one block 4, assuming that a tension difference occurs before and after the belt traveling direction and the left and right abutting portions 3, 3 of the block 4 do not slip with respect to the pulley, the tension difference becomes the block. Acts as a shear force F t on 4. And, due to this shearing force F t ,
In the plan view, the block 4 and the reinforcing member 9 are bent and deformed into a middle convex shape so that the central portion in the width direction is convex in the shear force acting direction, and the front side of the block 4 (reinforcing member 9) in the shear force acting direction is the tensile stress. And the rear side is the compressive stress side. Therefore, on the driven pulley side, the block 4 (reinforcing member 9)
In the belt traveling direction, the front side is the tensile stress side and the rear side is the compressive stress side. On the contrary, on the drive pulley side, the front side of the block 4 (reinforcing member 9) in the belt traveling direction is the compressive stress side and the rear side is the tensile stress side. .
第７図および第８図は上記の補強部材９について有限要
素法により応力分布を解析した場合の応力分布を示し、
第７図は補強部材９の圧縮応力面側の応力分布を、第８
図は補強部材９の引張応力面側の応力分布をそれぞれ示
している。そして、第７図に示すように、上側ビーム部
10の段差部14に圧縮応力が集中しており、この応力集中
に伴い、第８図に示すように応力分布パターンが段差部
14に引き摺られて、引張応力集中部15への応力集中が分
散緩和され、第14図に示す段差部14のない従来例（尚、
第８図と同じ部分については「′」を付けた同じ符号を
付して示す）と比べ、引張応力集中部15に対する応力集
中を低減することができる。7 and 8 show the stress distribution when the stress distribution is analyzed by the finite element method for the reinforcing member 9 described above,
FIG. 7 shows the stress distribution of the reinforcing member 9 on the compressive stress surface side,
The figures respectively show the stress distribution on the tensile stress surface side of the reinforcing member 9. Then, as shown in FIG. 7, the upper beam portion
The compressive stress is concentrated on the step portion 14 of 10 and, due to this stress concentration, as shown in FIG.
14, the stress concentration on the tensile stress concentration portion 15 is dispersed and relaxed, and there is no step portion 14 shown in FIG.
The stress concentration on the tensile stress concentration portion 15 can be reduced as compared with the case of FIG. 8 in which the same parts as those shown in FIG.
尚、上記した上側ビーム部10における段差部14の最適位
置を設定するための応力解析の経緯について第９図〜第
13図により説明する。本解析に当たり、具体的に、補強
部材９の寸法は、その中央部での上下高さが11.5mm、上
側ビーム部10のベルト幅方向の長さが26mm、下側ビーム
部11のベルト幅方向の長さが24mm、センターピラー部12
の上下高さが4mm、センターピラー部12の左右方向幅が
4.2mmとし、ブロック４の重心位置はベルトＡのニュー
トラルラインに一致するような形状としている。また、
補強部材９の下側ビーム部11の形状は全解析モデルに対
し一定とする。The process of stress analysis for setting the optimum position of the step portion 14 in the upper beam portion 10 described above will be described with reference to FIGS.
It will be described with reference to FIG. In this analysis, the dimensions of the reinforcing member 9 are as follows: the vertical height at the central portion is 11.5 mm, the length of the upper beam portion 10 in the belt width direction is 26 mm, and the lower beam portion 11 is in the belt width direction. Has a length of 24 mm, the center pillar part 12
Has a vertical height of 4 mm, and the width of the center pillar 12 in the left-right direction is
It is 4.2 mm, and the center of gravity of the block 4 is shaped so as to coincide with the neutral line of the belt A. Also,
The shape of the lower beam portion 11 of the reinforcing member 9 is constant for all analysis models.
第９図は段差部14が上側ビーム部10の先端に近い位置に
形成された場合を示し、この場合、同ビーム部10根元の
引張応力集中部15に発生する最大引張応力の力は19.0kg
／mm2であった。FIG. 9 shows the case where the step portion 14 is formed near the tip of the upper beam portion 10. In this case, the maximum tensile stress force generated in the tensile stress concentration portion 15 at the base of the upper beam portion 10 is 19.0 kg.
It was / mm 2 .
さらに、段差部14をブロック４の左右中央側（センター
ピラー部12）に近付けると、最大引張応力の値は小さく
なるが、所定位置を過ぎると増大する。そして、第10図
に示す位置に段差部14を形成した場合が最小となり、そ
の値は17.7kg／mm2であった。Further, when the step portion 14 is brought closer to the left and right center side of the block 4 (center pillar portion 12), the value of the maximum tensile stress becomes small, but increases after passing a predetermined position. The case where the step portion 14 was formed at the position shown in FIG. 10 was the minimum, and the value was 17.7 kg / mm 2 .
第11図〜第13図は上側ビーム部10に段差部14のみなら
ず、該段差部14の中央側に隣接してビーム部10外側に向
かって下方に傾斜する傾斜部16を形成した形状とした場
合である。この場合にも、引張応力集中部15に対する最
大引張応力を最小にする段差部14の最適位置が存在し、
第11図に示すようにビーム部10の先端に近い位置では最
大引張応力の値は18.1kg／mm2であり、第13図に示す如
くブロック４の中央に近い位置でも同じ18.1kg／mm2で
あるが、第12図に示すように上記の両位置の中間位置で
最大引張応力が最小となり、その値は16.2kg／mm2であ
った。11 to 13 show a shape in which not only the step portion 14 is formed in the upper beam portion 10 but also the inclined portion 16 which is adjacent to the center side of the step portion 14 and inclines downward toward the outside of the beam portion 10. That is the case. Also in this case, there is an optimum position of the step portion 14 that minimizes the maximum tensile stress with respect to the tensile stress concentration portion 15,
As shown in FIG. 11, the value of the maximum tensile stress is 18.1 kg / mm 2 at the position near the tip of the beam portion 10, and the same 18.1 kg / mm 2 at the position near the center of the block 4 as shown in FIG. However, as shown in FIG. 12, the maximum tensile stress was minimum at the intermediate position between the above two positions, and the value was 16.2 kg / mm 2 .
このように、補強部材９に形成すべき段差部14の最適位
置が存在するものの、その位置はブロック４の形状や寸
法に応じて変わることが判る。要は、上側ビーム部10の
上面両端部に段差部14を設け、その部分に圧縮応力を集
中させることにより、最大引張応力を分散緩和させてそ
の値を低減すればよいのである。As described above, although the optimum position of the step portion 14 to be formed on the reinforcing member 9 exists, it is understood that the position changes depending on the shape and size of the block 4. The point is that stepped portions 14 are provided at both end portions of the upper surface of the upper beam portion 10 and the compressive stress is concentrated in the portions to relax and disperse the maximum tensile stress and reduce its value.
因みに、補強部材９の上側ビーム部10に段差部14を設
け、さらにその最適位置を設定するとともに、傾斜部16
によって段差部14の形状を変えることにより、上側ビー
ム部10に発生する最大引張応力の値を約15％低減するこ
とができた。By the way, a step portion 14 is provided on the upper beam portion 10 of the reinforcing member 9, the optimum position thereof is set, and the inclined portion 16 is provided.
By changing the shape of the stepped portion 14 by the above, the value of the maximum tensile stress generated in the upper beam portion 10 could be reduced by about 15%.
また、その結果、こうした補強部材９を用いたＶベルト
Ａ（ブロックベルト）の高負荷ベルト耐久試験を行った
ところ、200時間を経過しても破壊に至らず、ベルトＡ
の寿命を大幅に延長できるという本発明の有効な効果が
判明した。Further, as a result, when a high load belt durability test of the V belt A (block belt) using such a reinforcing member 9 was performed, it was found that the belt A did not break even after 200 hours, and the belt A
It has been found that the effective effect of the present invention is that the life of the can be greatly extended.
（発明の効果） 以上説明したように、本発明によると、上下面にそれぞ
れ上下に対応する係合部が長手方向に並んで形成された
１対の張力帯と、該張力帯が嵌合する嵌合溝を有し、か
つ該嵌合溝の上下面にそれぞれ上記張力帯上下面の係合
部に係合する係止部が形成された多数のブロックとから
なり、張力帯の係合部と各ブロックの係止部との係合に
より、ブロックを張力帯に対しベルト長手方向に係止固
定してなるＶベルトにおいて、各ブロックに完全に埋め
込まれる１つの補強部材の上側ビーム部の上面両端部
に、ベルトのプーリへの係合時に上記張力帯から各ブロ
ックに作用するプーリに向かう方向の押付け力により上
側ビーム部の両端部をその根元よりも上方に撓み変形し
やすくかつその際に上側ビーム部の上面に発生する圧縮
応力を集中させるための段差部を形成したものであるの
で、その段差部によりブロックの最大引張応力集中部に
作用する最大引張応力を緩和低減させて同荷重条件下で
のブロックの疲労強度を高めることができ、高トルクを
連続的に作用させた場合であっても、ブロック破壊を回
避でき、ひいてはブロックベルトの大幅な寿命延長化を
図ることができるものである。(Effects of the Invention) As described above, according to the present invention, a pair of tension bands formed on the upper and lower surfaces respectively corresponding to the upper and lower sides in the longitudinal direction are fitted to each other. A plurality of blocks each having a fitting groove and formed with locking portions for engaging with the engaging portions on the upper and lower surfaces of the tension band, respectively, on the upper and lower surfaces of the fitting groove. In the V-belt in which the blocks are locked and fixed to the tension band in the belt longitudinal direction by the engagement between the blocks and the locking parts of the blocks, the upper surface of the upper beam part of one reinforcing member that is completely embedded in each block At both ends, when the belt is engaged with the pulley, the pressing force in the direction from the tension band toward the pulleys acting on each block causes the both ends of the upper beam portion to be easily bent and deformed above their roots, and at that time. Compressive stress generated on the upper surface of the upper beam Since a step is formed to concentrate the block, the step increases the fatigue strength of the block under the same load condition by relaxing and reducing the maximum tensile stress that acts on the block's maximum tensile stress concentration part. Therefore, even if high torque is continuously applied, block breakage can be avoided, and the life of the block belt can be greatly extended.
第１図〜第13図は本発明の実施例を示し、第１図はブロ
ックにおける補強部材の正面図、第２図はブロックの正
面図、第３図は同斜視図、第４図はＶベルトの側面図、
第５図は同斜視図、第６図は第４図のVI−VI線断面図、
第７図は補強部材における圧縮応力側の応力分布を示す
図、第８図は同引張応力面側の応力分布を示す図、第９
図〜第13図は段差部の最適位置を設定するための応力分
布を示す図である。第14図は段差部のない従来例におけ
る第８図相当図である。第15図は本発明例と従来例との
補強部材の押付け力による撓み変形の挙動を比較して示
す説明図、第16図はブロックの剪断力による曲げ変形の
挙動を示す説明図である。 Ａ…Ｖベルト、１…張力帯、1a…心線、２…嵌合溝、３
…当接部、４…ブロック、5,6…凹溝、7,8…凸条、９…
補強部材、10…上側ビーム部、11…下側ビーム部、12…
センターピラー部、13…ブロック本体、14…段差部。1 to 13 show an embodiment of the present invention. FIG. 1 is a front view of a reinforcing member in a block, FIG. 2 is a front view of the block, FIG. 3 is the same perspective view, and FIG. Side view of the belt,
5 is a perspective view of the same, FIG. 6 is a sectional view taken along line VI-VI of FIG. 4,
FIG. 7 is a diagram showing a stress distribution on the compressive stress side in the reinforcing member, FIG. 8 is a diagram showing a stress distribution on the tensile stress surface side, and FIG.
FIG. 13 to FIG. 13 are diagrams showing the stress distribution for setting the optimum position of the step portion. FIG. 14 is a view corresponding to FIG. 8 in a conventional example having no step portion. FIG. 15 is an explanatory view showing the behavior of flexural deformation due to the pressing force of the reinforcing member in the example of the present invention and the conventional example, and FIG. 16 is an explanatory view showing the behavior of bending deformation in the block due to shearing force. A ... V belt, 1 ... tension band, 1a ... core wire, 2 ... fitting groove, 3
... Abutting part, 4 ... block, 5,6 ... concave groove, 7,8 ... projection, 9 ...
Reinforcing member, 10 ... upper beam portion, 11 ... lower beam portion, 12 ...
Center pillar part, 13 ... Block body, 14 ... Step part.
Claims (1)
に延びかつベルト長手方向に並んで形成された多数の係
合部を有し、内部に心線が埋設されたエンドレスの平ベ
ルトからなる１対の張力帯を備えるとともに、 本体内に、ベルト幅方向に延びる上側および下側ビーム
部と該両ビーム部のベルト幅方向中央部同士を上下に接
続するセンターピラー部とからなる１つの補強部材が完
全に埋め込まれてなる多数のブロックを備え、 上記各ブロックは、その両外側面にそれぞれ形成され上
記各張力帯が着脱可能に嵌合する切欠き状の嵌合溝と、
該嵌合溝の上下面にそれぞれ形成され上記張力帯上下面
の係合部にそれぞれ係合する係止部と、両外側面にそれ
ぞれ形成されプーリのベルト溝面に当接する当接部とを
有し、 上記張力帯の係合部と各ブロックの係止部との係合によ
り、各ブロックが１対の張力帯に対しベルト長手方向に
係止固定されてなるＶベルトであって、 上記各ブロックにおける補強部材の上側ビーム部の上面
両端部には、ビーム部上下幅が両端に向かって段差状に
減少変化し、ベルトのプーリへの係合時に上記張力帯か
ら各ブロックに作用するプーリ中心に向かう方向の押付
け力により上側ビーム部の両端部をその根元よりも上方
に撓み変形しやすくかつその際に上側ビーム部の上面に
発生する圧縮応力を集中させる段差部が形成されている
ことを特徴とする高負荷伝動用Ｖベルト。1. An endless flat belt having a plurality of engaging portions formed on the upper and lower surfaces in the belt width direction corresponding to the upper and lower sides and arranged side by side in the belt longitudinal direction, and having core wires embedded therein. And a center pillar portion that vertically connects the upper and lower beam portions extending in the belt width direction and the belt width direction central portions of the both beam portions to each other. A plurality of blocks each of which one reinforcing member is completely embedded are provided, and each of the blocks has a notch-shaped fitting groove that is formed on both outer side surfaces of the block, and in which the tension bands are detachably fitted,
Locking portions that are respectively formed on the upper and lower surfaces of the fitting groove and that engage with the engaging portions on the upper and lower surfaces of the tension band, and a contact portion that is formed on both outer surfaces and that abuts on the belt groove surface of the pulley. A V-belt, wherein each block is locked and fixed in a belt longitudinal direction with respect to a pair of tension bands by engagement of the engagement part of the tension band and the locking part of each block, At both ends of the upper surface of the upper beam portion of the reinforcing member in each block, the vertical width of the beam portion decreases in a stepwise manner toward both ends, and the pulleys that act on each block from the tension band when the belt is engaged with the pulleys. A stepped portion that concentrates the compressive stress generated on the upper surface of the upper beam portion at the time when the both ends of the upper beam portion are easily bent and deformed upward from the root due to the pressing force in the direction toward the center, is formed. High load characterized by V-belt for the dynamic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62312875A JPH0670453B2 (en) | 1987-12-10 | 1987-12-10 | V belt for high load transmission |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62312875A JPH0670453B2 (en) | 1987-12-10 | 1987-12-10 | V belt for high load transmission |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01153839A JPH01153839A (en) | 1989-06-16 |
| JPH0670453B2 true JPH0670453B2 (en) | 1994-09-07 |
Family
ID=18034492
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62312875A Expired - Fee Related JPH0670453B2 (en) | 1987-12-10 | 1987-12-10 | V belt for high load transmission |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0670453B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2535858Y2 (en) * | 1991-04-08 | 1997-05-14 | バンドー化学株式会社 | V belt for high load transmission |
| JP2992022B1 (en) * | 1998-10-16 | 1999-12-20 | バンドー化学株式会社 | V belt for high load transmission |
| JP2001003994A (en) * | 1999-06-21 | 2001-01-09 | Bando Chem Ind Ltd | V-belt for transmitting high load and its manufacture |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0237309Y2 (en) * | 1985-03-07 | 1990-10-09 |
-
1987
- 1987-12-10 JP JP62312875A patent/JPH0670453B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01153839A (en) | 1989-06-16 |
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| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |