JPH0328201Y2

JPH0328201Y2 -

Info

Publication number: JPH0328201Y2
Application number: JP1985028923U
Authority: JP
Priority date: 1985-02-27
Filing date: 1985-02-27
Publication date: 1991-06-18
Also published as: JPS61142937U

Description

【考案の詳細な説明】〔考案の目的〕（産業上の利用分野）本考案は、動力伝達機構に用いられるＶベルト
の改良に関するものであり、CVT（無段変速機）
を搭載した自動車等に利用される。[Detailed description of the invention] [Purpose of the invention] (Field of industrial application) The invention relates to the improvement of a V-belt used in a power transmission mechanism, and is a CVT (continuously variable transmission).
Used in cars etc. equipped with

（従来の技術）本考案に係る従来技術として、特開昭59−
50007号公報に示されるものがある。これは、第
２図に示すようにテンシヨンメンバ２１の両面に
上コグ２２と下コグ２３を接着したＶベルトであ
り、上コグ２２のピツチP_Uと下コグ２３のピツ
チP_Lとは任意に決定されている。(Prior art) As a prior art related to the present invention, JP-A-59-
There is one shown in Publication No. 50007. This is a V-belt in which an upper cog 22 and _a lower cog 23 are glued to both sides of a tension _member 21 as shown in FIG. It has been decided.

（考案が解決しようとする問題点）そのため下コグ２３の谷２６と相対する位置に
上コグ２２の山２４が来たり（Ａ部）、谷２５が
来たり（Ｂ部）、あるいはその中間が来たりして、
一定せず、Ｂ部の如く谷同士２５，２６が相対す
る所では、その厚さが薄いため伝達動力による引
張応力が大きくなつて、この部分から破損を招き
易い、という問題点があつた。(Problem to be solved by the invention) Therefore, the peak 24 of the upper cog 22 is located at a position opposite to the valley 26 of the lower cog 23 (part A), the valley 25 is located (part B), or the position in between is I came and
There was a problem in that where the valleys 25 and 26 are opposed to each other, such as in part B, the tensile stress due to the transmitted power becomes large because the thickness is thin, and damage is likely to occur from this part.

本考案はこの門題点を解消し、引張応力が部分
的に極力高くならないＶベルトを提供すること
を、その技術的課題とするものである。 The technical object of the present invention is to solve this problem and to provide a V-belt in which the tensile stress does not increase locally as much as possible.

[Structure of the idea]

（問題点を解決するための手段）上記技術的課題を達成するために講じた技術的
手段は、下コグのピツチP_Lを上コグのピツチP_U
の２又は３倍に設定すると共に、下コグの谷部の
相対する位置に上コグの山部を配置するように
し、さらに、下コグの谷部最下点と上コグの山部
頂点とで規定されるベルト厚さを、ベルト全周に
わたり均一且つ最小の厚さとなるように形成する
ことである。 (Means for solving the problem) The technical means taken to achieve the above technical problem is to change the pitch P _L of the lower cog to the pitch P _U of the upper cog.
In addition, the peak of the upper cog is placed at a position opposite to the valley of the lower cog, and the lowest point of the valley of the lower cog and the peak of the peak of the upper cog are The objective is to form the belt so that the prescribed thickness is uniform and minimum over the entire circumference of the belt.

（作用）上記技術的手段により、谷同士が相対すること
はなく、引張応力が部分的に極力高くなるという
ことがない。(Function) With the above technical means, the valleys do not face each other, and the tensile stress does not become as high as possible locally.

（実施例）以下本考案を実施例に基いて説明する。(Example) The present invention will be explained below based on examples.

第１図において、テンシヨンメンバ１１に上コ
グ１２と下コグ１３が接着されており。下コグ１
３のピツチP_Lと上コグ１２のピツチP_Uとの関係
は、P_L＝2P_Uとなつている。また下コグ１３の谷
１６に相対する位置には上コグ１２の山１４が１
つおきに配置されている。従つて谷同士１４，１
６が同位置に配されることはなく、Ｃの厚さが確
保される。 In FIG. 1, an upper cog 12 and a lower cog 13 are bonded to a tension member 11. Lower cog 1
The relationship between the pitch P _L of No. 3 and the pitch P _U of the upper cog 12 is P _L =2P _U. In addition, the peak 14 of the upper cog 12 is located at a position opposite to the valley 16 of the lower cog 13.
They are placed in rows. Therefore, the valleys are 14,1
6 are not arranged at the same position, and the thickness of C is ensured.

尚、P_L＝Ｎ・P_UにおいてＮは２又は３が実用
的である。 Note that in P _L =N·P _U , N is practically 2 or 3.

[Effect of idea]

本課題を達成するために、第３図に示すように
上コグ３３を一定厚Ｄとすることも考ええられ
る。しかしこのこのものは、Ｖベルトを掛けるプ
−リに巻かれる屈曲部でのプ−リ当接面積を確保
するために厚さＤを大きくしなければならなく、
Ｄを大きくすると屈曲率が悪くなり、プ−リに十
分密着せず動力伝達効率が悪くなる。また屈曲率
を良くするように厚さＤを小さくするとプ−リと
の密着圧が高くなり、これに耐えられない、とい
う新たな問題を生ずる。 In order to achieve this object, it is also conceivable to make the upper cog 33 have a constant thickness D as shown in FIG. However, in this case, the thickness D must be increased in order to secure the pulley contact area at the bending part where the V-belt is wrapped around the pulley.
If D is increased, the bending ratio will deteriorate, and the pulley will not be in close contact with the pulley, resulting in poor power transmission efficiency. Furthermore, if the thickness D is made small in order to improve the curvature, the contact pressure with the pulley increases and a new problem arises in that it cannot withstand this pressure.

これに対し本考案のものは上コグの谷で屈曲率
が確保されると共に、上コグの山でプ−リとの密
着圧をうけるので、動力伝達効率が高い。 On the other hand, in the case of the present invention, the curvature is ensured at the valleys of the upper cog, and the ridges of the upper cog receive close contact pressure with the pulley, resulting in high power transmission efficiency.

[Brief explanation of drawings]

第１図は本考案の実施例部分図、第２図は従来
技術の部分図、第３図は本考案との比較のための
部分図である。１１……テンシヨンメンバ、１２……上コグ、
１３……下コグ、１４……山、１５，１６……
谷。 FIG. 1 is a partial view of an embodiment of the present invention, FIG. 2 is a partial view of the prior art, and FIG. 3 is a partial view for comparison with the present invention. 11...Tension member, 12...Upper cog,
13...lower cog, 14...mountain, 15,16...
valley.

Claims

[Scope of utility model registration request]

In a V-belt formed by bonding an upper cog and a lower cog to both sides of a tension member, the pitch P _L of the lower cog is set to 2 or 3 times the pitch P _U of the upper cog, and the valley of the lower cog Furthermore, the belt thickness defined by the lowest point of the trough of the lower cog and the apex of the crest of the upper cog is set to the entire circumference of the belt. A V-belt characterized by being formed to have a uniform and minimum thickness over the entire length.