JP2013133894A - Metal belt for continuously variable transmission and design method of metal belt for continuously variable transmission - Google Patents
Metal belt for continuously variable transmission and design method of metal belt for continuously variable transmission Download PDFInfo
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Abstract
Description
本発明は、無段変速機用金属ベルト、及び無段変速機用金属ベルトの設計方法に関する。 The present invention relates to a metal belt for a continuously variable transmission and a method for designing a metal belt for a continuously variable transmission.
従来、下記特許文献１に開示されているようなブロック式金属ベルトや、特許文献２に開示されているような製造方法により製造された無段変速機用金属ベルトが提供されている。これらの従来技術は、従前より提供されている無段変速機用金属ベルトを無段変速機に用いた場合に発生する騒音レベルを抑制しようとするものである。 Conventionally, a block-type metal belt disclosed in Patent Document 1 below and a metal belt for continuously variable transmission manufactured by a manufacturing method disclosed in Patent Document 2 have been provided. These prior arts are intended to suppress the noise level generated when a metal belt for a continuously variable transmission provided in the past is used in a continuously variable transmission.
下記特許文献１，２に開示されている従来技術においては、無段変速機用金属ベルトに用いられる多数のエレメントを、厚みの異なる複数種のもので構成することにより、騒音レベルの低下を試みている。具体的には、下記特許文献１の従来技術においては、厚みの異なるエレメントをランダムに配列して環状に形成している。また、下記特許文献２の従来技術においては、環状に形成されるベルトを周方向前半部分と後半部分とに分け、前半部分を構成するエレメントの厚みと、後半部分を構成するエレメントの厚みとを相違させることとしている。 In the prior art disclosed in Patent Documents 1 and 2 below, a number of elements used in the metal belt for continuously variable transmissions are configured with a plurality of types having different thicknesses, thereby attempting to reduce the noise level. ing. Specifically, in the prior art disclosed in Patent Document 1 below, elements having different thicknesses are randomly arranged to form an annular shape. Moreover, in the prior art of the following Patent Document 2, the belt formed in an annular shape is divided into a circumferential first half part and a second half part, and the thickness of the element constituting the first half part and the thickness of the element constituting the second half part are determined. It is supposed to be different.
本発明者らが、上記特許文献１，２に開示されている従来技術の金属ベルトにつき、騒音の抑制効果について検討したところ、全てのエレメントの厚みが同一である従前の金属ベルトに比べて幾ばくか騒音レベルが低下することが見いだされた。しかしながら、従来技術の金属ベルトにおいては騒音レベルの抑制効果が不十分であり、より一層の騒音抑制効果を有する無段変速機用金属ベルトの提供が求められている。また、騒音抑制効果の高い無段変速機用金属ベルトを容易かつ精度良く設計可能な設計方法の提供が求められている。 The present inventors examined the noise suppression effect of the prior art metal belts disclosed in Patent Documents 1 and 2 and found that it was a little more than a conventional metal belt in which all elements had the same thickness. It was found that the noise level decreased. However, the metal belt of the prior art has an insufficient effect of suppressing the noise level, and there is a demand for providing a metal belt for continuously variable transmission that has a further noise suppressing effect. There is also a need to provide a design method that can easily and accurately design a metal belt for a continuously variable transmission having a high noise suppression effect.
そこで、本発明は、騒音の抑制効果が高い無段変速機用金属ベルト、及び当該無段変速機用金属ベルトの設計方法の提供を目的とした。 Therefore, the present invention has an object to provide a metal belt for continuously variable transmission having a high noise suppressing effect and a method for designing the metal belt for continuously variable transmission.
上述した課題を解決すべく提供される本発明の無段変速機用金属ベルトは、無端環状体に沿って厚みが相違する複数種のエレメントを配置することにより形成された無段変速機用金属ベルトであって、厚みが同一である前記エレメントを前記無端環状体に沿って連続的に配置した同厚エレメント群を複数有し、前記同厚エレメント群のそれぞれが、前記無端環状体の全長に対して１％以上の長さを有することを特徴としている。 The metal belt for continuously variable transmission of the present invention provided to solve the above-described problem is a metal for continuously variable transmission formed by arranging a plurality of types of elements having different thicknesses along an endless annular body. A belt having a plurality of same-thickness element groups in which the same-thickness elements are continuously arranged along the endless annular body, and each of the same-thickness element groups has a total length of the endless annular body. On the other hand, it has a length of 1% or more.
本発明のように、厚みが同一であるエレメントを無端環状体に沿って連続的に配置した同厚エレメント群のそれぞれについて、無端環状体の全長に対して１％以上の長さのものとすることにより、騒音の発生ピークの分散化、及び低振幅化を図り、無段変速機において発生する騒音を最小限に抑制可能な無段変速機用金属ベルトを提供することができる。 As in the present invention, each of the same-thickness element groups in which elements having the same thickness are continuously arranged along the endless annular body has a length of 1% or more with respect to the total length of the endless annular body. Accordingly, it is possible to provide a metal belt for continuously variable transmission that can reduce noise generation peaks and reduce the amplitude, and can suppress noise generated in the continuously variable transmission to a minimum.
また、同様の課題を解決すべく提供される本発明の無段変速機用金属ベルトの設計方法は、無端環状体に沿って厚みが相違する複数種のエレメントを配置することにより形成され、厚みが同一である前記エレメントを前記無端環状体に沿って連続的に配置した同厚エレメント群を複数有し、前記同厚エレメント群のそれぞれが、前記無端環状体の全長に対して１％以上の長さを有する無段変速機用金属ベルトの設計方法であって、前記同厚エレメント群の配列として想定されるものを導出する配列導出工程と、前記配列導出工程において導出された配列の一部又は全部につき、当該配列を有する無段変速機用金属ベルトを所定の無段変速機に用いた場合における騒音の発生レベルを導出する騒音導出工程と、前記騒音導出工程において導出された騒音の発生レベルのうち最も低いものに相当する同厚エレメント群の配列を導出する配列選定工程とを有することを特徴としている。 In addition, the design method of the metal belt for continuously variable transmission of the present invention provided to solve the same problem is formed by arranging a plurality of types of elements having different thicknesses along the endless annular body. A plurality of the same-thickness element groups in which the same elements are continuously arranged along the endless annular body, and each of the same-thickness element groups is 1% or more of the total length of the endless annular body A method of designing a metal belt for a continuously variable transmission having a length, wherein an arrangement deriving step for deriving an arrangement of the same-thickness element group and a part of the arrangement derived in the arrangement deriving step Alternatively, a noise deriving step for deriving a noise generation level when the metal belt for continuously variable transmission having the arrangement is used for a predetermined continuously variable transmission, and the noise deriving step. It is characterized by having a sequence selected deriving a sequence of equal-thickness element group corresponding to the lowest of the generated noise levels were.
本発明の無段変速機用金属ベルトの設計方法によれば、騒音の発生ピークの分散化、及び低振幅化を図る上で最適な同厚エレメント群の配列を容易に導出することが可能となる。これにより、無段変速機において発生する騒音を最小限に抑制可能な無段変速機用金属ベルトを容易かつ精度良く設計することが可能となる。 According to the method for designing a metal belt for continuously variable transmission according to the present invention, it is possible to easily derive an optimal arrangement of elements having the same thickness for dispersion of noise generation peaks and reduction in amplitude. Become. This makes it possible to easily and accurately design a continuously variable transmission metal belt capable of minimizing noise generated in the continuously variable transmission.
本発明によれば、騒音の抑制効果が高い無段変速機用金属ベルト、及び当該無段変速機用金属ベルトの設計方法を提供することができる。 ADVANTAGE OF THE INVENTION According to this invention, the design method of the metal belt for continuously variable transmission with the high noise suppression effect and the said metal belt for continuously variable transmission can be provided.
続いて、本発明の一実施形態に係る無段変速機用金属ベルト１０について、図面を参照しつつ詳細に説明する。図１（ａ）に示すように、無段変速機用金属ベルト１０は、無段変速機を構成する二つのプーリＰ１，Ｐ２間に掛け回した状態で使用されるものである。図１（ｂ）に示すように、無段変速機用金属ベルト１０は、金属板を複数積層し、環状にすることにより形成されたフープ１２（無端環状体）に対し、多数のエレメント２０を連ねた状態で装着することにより形成されたものである。無段変速機用金属ベルト１０を構成するエレメント２０の数はいかなるものであっても良いが、本実施形態では約４００個のエレメント２０によって無段変速機用金属ベルト１０が構成されている。 Next, a continuously variable transmission metal belt 10 according to an embodiment of the present invention will be described in detail with reference to the drawings. As shown in FIG. 1A, the continuously variable transmission metal belt 10 is used in a state of being wound around two pulleys P1 and P2 constituting the continuously variable transmission. As shown in FIG. 1 (b), the continuously variable transmission metal belt 10 includes a plurality of elements 20 with respect to a hoop 12 (endless annular body) formed by laminating a plurality of metal plates into an annular shape. It is formed by mounting in a state of being connected. The number of the elements 20 constituting the continuously variable transmission metal belt 10 may be any number, but in the present embodiment, about 400 elements 20 constitute the continuously variable transmission metal belt 10.
エレメント２０は、鋼板製のプレートによって構成されている。図１（ｂ）に示すように、エレメント２０は、無段変速機のプーリＰ１，Ｐ２に当接するボディ部２２と、ボディ部２２に対してピラー部２４を介して接続されたヘッド部２６とを有する。ピラー部２４の両脇であって、ボディ部２２とヘッド部２６との間の部分には、フープ１２を受け入れるためのサドル部２８が形成されている。 The element 20 is composed of a steel plate. As shown in FIG. 1B, the element 20 includes a body portion 22 that contacts the pulleys P1 and P2 of the continuously variable transmission, and a head portion 26 connected to the body portion 22 via a pillar portion 24. Have Saddle portions 28 for receiving the hoops 12 are formed on both sides of the pillar portion 24 and between the body portion 22 and the head portion 26.
本実施形態においては、エレメント２０として、板厚が相違する複数種のものが用いられている。具体的には、図１（ｃ）においてハッチングの有無によって区別して示すように、エレメント２０として、板厚が厚いものと薄いものの二種類のものが用いられている。エレメント２０の厚みｔは、いかなるものであっても良いが、板厚の厚いエレメント２０（以下、「エレメント２０ａ」とも称す）の厚みｔが１．５［ｍｍ］とされている。板厚の薄いエレメント２０（以下、「エレメント２０ｂ」とも称す）は、厚みｔが１．４［ｍｍ］とされている。また、エレメント２０ａ，２０ｂは、厚みｔ以外の構成については同一とされている。 In the present embodiment, as the element 20, a plurality of types having different plate thicknesses are used. Specifically, as shown in FIG. 1C by distinguishing the presence / absence of hatching, two types of elements 20 are used, one having a thick plate and the other having a thin plate. The thickness t of the element 20 may be anything, but the thickness t of the thick element 20 (hereinafter also referred to as “element 20a”) is 1.5 [mm]. The thin element 20 (hereinafter also referred to as “element 20b”) has a thickness t of 1.4 [mm]. Further, the elements 20a and 20b are the same except for the structure except for the thickness t.
無段変速機用金属ベルト１０は、上述したエレメント２０ａ，２０ｂの配列構造に特徴を有する。具体的には、無段変速機用金属ベルト１０は、厚みｔが同一であるエレメント２０（２０ａ，２０ｂ）をフープ１２に沿って連続的に配置した同厚エレメント群３０を複数有する。すなわち、板厚の厚いエレメント２０ａを連続的に配置することにより構成された同厚エレメント群３０（以下、「同厚エレメント群３０ａ」とも称す）、及び板厚の薄いエレメント２０ｂを連続的に配置することにより構成された同厚エレメント群３０（以下、「同厚エレメント群３０ｂ」とも称す）によって無段変速機用金属ベルト１０が構成されている。同厚エレメント群３０ａ，３０ｂは、無段変速機用金属ベルト１０の周方向に交互に並ぶように配置されている。 The continuously variable transmission metal belt 10 is characterized by the arrangement structure of the elements 20a and 20b described above. Specifically, the continuously variable transmission metal belt 10 includes a plurality of elements 30 having the same thickness in which the elements 20 (20 a, 20 b) having the same thickness t are continuously arranged along the hoop 12. That is, the same-thickness element group 30 (hereinafter also referred to as “same-thickness element group 30a”) configured by continuously disposing the thick plate elements 20a and the thin plate element 20b are continuously disposed. The metal belt 10 for a continuously variable transmission is configured by the same thickness element group 30 (hereinafter, also referred to as “same thickness element group 30b”) configured as described above. The same-thickness element groups 30a, 30b are arranged so as to be alternately arranged in the circumferential direction of the continuously variable transmission metal belt 10.
また、上述した同厚エレメント群３０ａ，３０ｂは、それぞれフープ１２の全長に対して１％以上の長さを有するものとされている。言い換えれば、各同厚エレメント群３０ａ，３０ｂは、少なくとも５個以上のエレメント２０ａ，２０ｂを連続的に配置することによって構成されている。従って、無段変速機用金属ベルト１０は、従来技術のもののようにエレメント２０（２０ａ，２０ｂ）の板厚ｔがフープ１２の周方向に短周期で次々と変化するのではなく、比較的長周期で切り替わる。 Further, the same thickness element group 30a, 30b described above has a length of 1% or more with respect to the entire length of the hoop 12. In other words, each same-thickness element group 30a, 30b is configured by continuously arranging at least five elements 20a, 20b. Therefore, the continuously variable transmission metal belt 10 does not change the plate thickness t of the elements 20 (20a, 20b) in a short cycle one after another in the circumferential direction of the hoop 12 as in the prior art. It changes at a cycle.
続いて、無段変速機用金属ベルト１０を騒音低減の観点から設計する設計方法について、図面を参照しつつ詳細に説明する。無段変速機用金属ベルト１０を無段変速機のプーリＰ１，Ｐ２間に掛け回して作動させた場合、エレメント２０がプーリＰ１，Ｐ２に進入すること、及びプーリＰ１，Ｐ２から脱離することにより衝突することにより、振動騒音が発生する。この騒音は、エレメント２０が所定の一点を通過する際の周波数に相当する。 Next, a design method for designing the continuously variable transmission metal belt 10 from the viewpoint of noise reduction will be described in detail with reference to the drawings. When the continuously variable transmission metal belt 10 is operated by being wound between the pulleys P1 and P2 of the continuously variable transmission, the element 20 enters the pulleys P1 and P2 and is detached from the pulleys P1 and P2. Due to the collision, vibration noise is generated. This noise corresponds to the frequency at which the element 20 passes a predetermined point.
かかる知見の下、図２（ａ）に示すように、エレメント２０がプーリＰ１，Ｐ２に衝突することにより発生する衝撃波を正弦波と同視可能であると共に、エレメント２０の厚みｔの変化に応じて前述した正弦波の波長が変化すると仮定すれば、フーリエ解析（ＦＦＴ）により解析を実行することにより、無段変速機用金属ベルト１０において発生する騒音についてピークとなる周波数の位置、及び大きさを図２（ｃ）に示すように導出することができる。そこで、無段変速機における使用時に騒音が最小となる同厚エレメント群３０ａ，３０ｂの配列について、下記の設計手順によって導出することができる。 Under such knowledge, as shown in FIG. 2A, the shock wave generated when the element 20 collides with the pulleys P1 and P2 can be equated with a sine wave, and according to the change in the thickness t of the element 20 Assuming that the wavelength of the sine wave changes, the position and magnitude of the peak frequency for noise generated in the metal belt 10 for continuously variable transmission can be determined by performing analysis by Fourier analysis (FFT). It can be derived as shown in FIG. Therefore, the arrangement of the same thickness element groups 30a and 30b that minimizes noise when used in a continuously variable transmission can be derived by the following design procedure.
＜無段変速機用金属ベルト１０の設計手順について＞
無段変速機用金属ベルト１０は、配列導出工程、騒音導出工程、配列選定工程を実行することにより、騒音低減の観点から設計することができる。無段変速機用金属ベルト１０の設計は、上述した各工程について実施するための設計用プログラムをインストールしてなるコンピュータを用いて実行することができる。
<Design procedure of metal belt 10 for continuously variable transmission>
The continuously variable transmission metal belt 10 can be designed from the viewpoint of noise reduction by executing an array derivation process, a noise derivation process, and an array selection process. The design of the continuously variable transmission metal belt 10 can be performed using a computer in which a design program for executing the above-described steps is installed.
配列導出工程は、同厚エレメント群３０ａ，３０ｂの配列として想定されるものを導出する工程である。この工程においては、同厚エレメント群３０ａ，３０ｂがエレメント２０ａ，２０ｂを最低限ｎ個（ｎ＝５以上の整数）備えたものとの設定の下で配列の導出処理を実行することが望ましい。このようにして配列導出工程を実施することにより、同厚エレメント群３０ａ，３０ｂの配列、及び各同厚エレメント群３０ａ，３０ｂを構成するエレメント２０ａ，２０ｂの数量についてのバリエーションが導出される。 The arrangement deriving step is a step of deriving what is assumed as the arrangement of the same thickness element groups 30a and 30b. In this step, it is desirable to execute the array derivation process under the setting that the element groups 30a and 30b having the same thickness include at least n elements 20a and 20b (an integer equal to or greater than 5). By carrying out the arrangement deriving step in this way, variations in the arrangement of the same-thickness element groups 30a and 30b and the quantity of the elements 20a and 20b constituting each of the same-thickness element groups 30a and 30b are derived.
騒音導出工程は、配列導出工程において導出された同厚エレメント群３０ａ，３０ｂの配列につき、この配列を有する無段変速機用金属ベルト１０を所定の無段変速機に用いた場合における騒音の発生レベルを導出する工程である。騒音導出工程において配列導出工程において導出された配列の全てについて騒音の発生レベルを導出することとしても良いが、明らかに騒音が高いと想定される配列を除外する等して一部の配列のみについて騒音の発生レベルを導出することとしても良い。 The noise deriving step generates noise when the continuously variable transmission metal belt 10 having this arrangement is used in a predetermined continuously variable transmission with respect to the arrangement of the same thickness element groups 30a and 30b derived in the arrangement deriving step. This is a process of deriving a level. In the noise derivation process, the noise generation level may be derived for all of the arrays derived in the array derivation process, but only some of the arrays are excluded, such as excluding arrays that are clearly assumed to be high in noise. The generation level of noise may be derived.
騒音導出工程は、下記（１）〜（３）に記載の仮定、及び導出方法に則って実行される。
（１） 無段変速機用金属ベルト１０において発生する騒音を、プーリＰ１，Ｐ２との衝突による振動発生と想定し、振動波形を振幅が１の正弦波と仮定する（図２（ａ）参照）。
（２） 上記（１）において仮定する正弦波の波長を、エレメント２０ａ，２０ｂの厚みｔに相当するものと仮定する。すなわち、エレメント２０ａ，２０ｂの厚みｔに依存して、騒音をなす正弦波の波長が変化するものと仮定する（図２（ｂ）参照）。
（３） 配列導出工程において導出された同厚エレメント群３０ａ，３０ｂの配列に則り、エレメント２０ａ，２０ｂの厚みｔ相当の波長を有する正弦波を一列に配置する。これにより、無段変速機用金属ベルト１０を一周させた場合に発生する騒音に相当する波形（騒音波形）を形成する（図２（ｂ）参照）。
（４） 上記（３）において導出された無段変速機用金属ベルト１０の一周分相当の騒音波形につき、フーリエ解析（ＦＦＴ）を実行する（図２（ｃ）参照）。
The noise derivation step is executed in accordance with the assumptions and derivation methods described in (1) to (3) below.
(1) The noise generated in the continuously variable transmission metal belt 10 is assumed to be vibration generated by a collision with the pulleys P1 and P2, and the vibration waveform is assumed to be a sine wave having an amplitude of 1 (see FIG. 2A). ).
(2) It is assumed that the wavelength of the sine wave assumed in the above (1) corresponds to the thickness t of the elements 20a and 20b. That is, it is assumed that the wavelength of the sine wave that makes noise changes depending on the thickness t of the elements 20a and 20b (see FIG. 2B).
(3) In accordance with the arrangement of the same-thickness element groups 30a and 30b derived in the arrangement deriving step, sine waves having wavelengths corresponding to the thickness t of the elements 20a and 20b are arranged in a line. As a result, a waveform (noise waveform) corresponding to noise generated when the continuously variable transmission metal belt 10 is made to make one round is formed (see FIG. 2B).
(4) A Fourier analysis (FFT) is performed on the noise waveform corresponding to one round of the continuously variable transmission metal belt 10 derived in (3) (see FIG. 2C).
上述したようにして騒音導出工程を実行すると、プーリＰ１，Ｐ２間において無段変速機用金属ベルト１０を一周させた場合に発生する騒音が、次数と振幅との関係として導出される。ここで、次数とは、入力回転数に対して発生する騒音の周波数の比のことである。さらに詳細には、エレメント２０の厚みｔが全て同じであるとした場合、プーリＰ１，Ｐ２間において無段変速機用金属ベルト１０を１回転させた際に、エレメント２０がプーリＰ１，Ｐ２に対して衝突することによってｎ回分の衝撃音（騒音）が発生する場合の次数はｎ次となる。本実施形態では、エレメント２０として、厚みｔの相違する２種類のもの（エレメント２０ａ，２０ｂ）を用いている。そのため、無段変速機用金属ベルト１０の全長をＬとし、エレメント２０ａ，２０ｂの厚みをそれぞれＡ，Ｂとした場合、Ｌ／Ａ次、及びＬ／Ｂ次の次数において他を卓越した衝撃音（騒音）が発生しうる。 When the noise derivation process is executed as described above, the noise generated when the continuously variable transmission metal belt 10 makes a round between the pulleys P1 and P2 is derived as a relationship between the order and the amplitude. Here, the order is the ratio of the frequency of noise generated with respect to the input rotational speed. More specifically, assuming that the thickness t of all the elements 20 is the same, when the metal belt 10 for continuously variable transmission is rotated once between the pulleys P1 and P2, the element 20 is compared with the pulleys P1 and P2. When the impact sound (noise) for n times is generated by the collision, the order is n-th order. In the present embodiment, as the element 20, two types (elements 20a and 20b) having different thicknesses t are used. Therefore, when the overall length of the continuously variable transmission metal belt 10 is L and the thicknesses of the elements 20a and 20b are A and B, respectively, the impact sound that is outstanding in the L / A and L / B orders. (Noise) may occur.
続いて、上述した騒音導出工程により得られる結果の一例について説明する。先ず、本実施形態の無段変速機用金属ベルト１０の比較例である無段変速機用金属ベルト１００〜１０４について説明する。無段変速機用金属ベルト１００〜１０４について騒音導出工程により騒音の発生状態についてシミュレーションすると、図３（ａ）〜（ｅ）に示すような結果が得られる。 Subsequently, an example of a result obtained by the noise derivation process described above will be described. First, the continuously variable transmission metal belts 100 to 104, which are comparative examples of the continuously variable transmission metal belt 10 of the present embodiment, will be described. When the noise generation state is simulated by the noise derivation process for the continuously variable transmission metal belts 100 to 104, the results shown in FIGS. 3A to 3E are obtained.
具体的には、無段変速機用金属ベルト１００は、エレメント２０を全て同一の厚みｔを有するものによって構成したもの、すなわち全てのエレメント２０をエレメント２０ａ，２０ｂのいずれかのみによって構成したものである。無段変速機用金属ベルト１００について騒音導出工程による騒音の発生シミュレーションを実行すると、図３（ａ）に示すような急峻なピークが発現する。また、厚みｔの異なるエレメント２０ａ，２０ｂを交互に配列した無段変速機用金属ベルト１０１の場合は、図３（ｂ）に示すように所定の次数位置にピークが発現する。この状態では、略一定周期で大きな騒音が発生してしまうことが想定される。 Specifically, the continuously variable transmission metal belt 100 is composed of all elements 20 having the same thickness t, that is, all elements 20 composed of only one of the elements 20a and 20b. is there. When a noise generation simulation by the noise derivation process is executed for the continuously variable transmission metal belt 100, a steep peak as shown in FIG. In the case of the continuously variable transmission metal belt 101 in which the elements 20a and 20b having different thicknesses t are alternately arranged, a peak appears at a predetermined order position as shown in FIG. In this state, it is assumed that a large noise is generated at a substantially constant period.
また、無段変速機用金属ベルト１０２は、周方向前半部分をエレメント２０ａ，２０ｂのいずれか一方のみで構成し、後半部分をエレメント２０ａ，２０ｂの他方のみで構成したものである。この場合について騒音導出工程による騒音の発生シミュレーションを実行すると、図３（ｃ）に示すように二つのピークが発現する。各ピークの高さ（振幅）が図３（ａ），（ｂ）の無段変速機用金属ベルト１００，１０１に比べて低いため、各次数位置において発生する騒音は低くなる。しかしながら、無段変速機用金属ベルト１０２が一周する間に二つの騒音が発生することになり、好ましい騒音の発生状態とは言えない。 Further, the continuously variable transmission metal belt 102 is configured such that the first half of the circumferential direction is configured by only one of the elements 20a and 20b and the second half is configured by only the other of the elements 20a and 20b. In this case, when a noise generation simulation by the noise derivation process is executed, two peaks appear as shown in FIG. Since the height (amplitude) of each peak is lower than that of the continuously variable transmission metal belts 100 and 101 of FIGS. 3A and 3B, noise generated at each order position is low. However, two noises are generated while the continuously variable transmission metal belt 102 makes one round, which is not a preferable noise generation state.
無段変速機用金属ベルト１０３は、従来技術として例示したように、厚みｔの異なるエレメント２０ａ，２０ｂをランダムに配列したものである。これについて騒音導出工程による騒音の発生シミュレーションを実行すると、図３（ｄ）に示すような騒音の発生状態になるとの結果が得られる。この場合は、図３（ａ），（ｂ）に示すものと同様に急峻なピークが発現し、騒音が際だつ状態になる。また、無段変速機用金属ベルト１０４は、上述した従来技術のように、周方向前半部分と後半部分とでエレメント２０ａ，２０ｂの配合比率を変化させたものである。これについて騒音導出工程による騒音の発生シミュレーションを実行すると、図３（ｅ）に示すように二つのピークが発現する。図３（ｅ）に示す騒音発生状態は、上述した図３（ｃ）に示すものと同様であり、好ましい騒音の発生状態とは言えない。 The continuously variable transmission metal belt 103 is formed by randomly arranging elements 20a and 20b having different thicknesses t as exemplified in the prior art. When a noise generation simulation by the noise derivation process is executed for this, a result that a noise generation state as shown in FIG. 3D is obtained is obtained. In this case, as in the case shown in FIGS. 3 (a) and 3 (b), a steep peak appears and the noise becomes conspicuous. Further, the continuously variable transmission metal belt 104 is obtained by changing the blending ratio of the elements 20a and 20b between the first half and the second half in the circumferential direction as in the above-described prior art. When a noise generation simulation by the noise derivation process is executed, two peaks appear as shown in FIG. The noise generation state shown in FIG. 3 (e) is the same as that shown in FIG. 3 (c) described above and cannot be said to be a preferable noise generation state.
これに対し、本実施形態において示す無段変速機用金属ベルト１０に相当する配列でエレメント２０ａ，２０ｂを配置した場合の騒音の次数と振幅との関係についてシミュレーションを行うと、図４（ｂ）に示すような結果が得られる。このように、無段変速機用金属ベルト１０については、無段変速機の駆動時に発生する騒音がピーク性（周期性）を有するものではなく、その振幅も小さい。 On the other hand, when a simulation is performed on the relationship between the order of noise and the amplitude when the elements 20a and 20b are arranged in an arrangement corresponding to the continuously variable transmission metal belt 10 shown in the present embodiment, FIG. The result shown in is obtained. As described above, in the continuously variable transmission metal belt 10, noise generated when the continuously variable transmission is driven does not have a peak characteristic (periodicity), and the amplitude thereof is small.
上述したようにして騒音導出工程においてエレメント２０ａ，２０ｂ（同厚エレメント群３０ａ，３０ｂ）を種々変化させた場合の騒音発生状態のシミュレーションが完了すると、無段変速機用金属ベルト１０の設計用プログラムにより、配列選定工程が実施される。配列選定工程においては、上述した騒音導出工程において導出された騒音の発生レベルのうち、最も低いものに相当する同厚エレメント群３０ａ，３０ｂの配列を導出する工程である。具体的には、無段変速機の駆動時に発生すると想定される騒音についてピーク性がなく、振幅が最も低くなる同厚エレメント群３０ａ，３０ｂの配列が、無段変速機用金属ベルト１０のものとして選定される。 When the simulation of the noise generation state is completed when the elements 20a and 20b (the same thickness element groups 30a and 30b) are variously changed in the noise derivation process as described above, the program for designing the metal belt 10 for continuously variable transmission is completed. Thus, the sequence selection process is performed. The array selection step is a step of deriving an array of the same-thickness element groups 30a and 30b corresponding to the lowest noise generation level derived in the noise deriving step. More specifically, the arrangement of the same-thickness element groups 30a and 30b having no peak and no amplitude in the noise assumed to be generated when the continuously variable transmission is driven is that of the metal belt 10 for the continuously variable transmission. Selected as
上述したようにして同厚エレメント群３０ａ，３０ｂの最適な配列を導出及び選定して作成された無段変速機用金属ベルト１０について、無段変速機のプーリＰ１，Ｐ２間において回動させた場合の騒音について、振幅及び騒音レベル（騒音の大きさ）と、発生頻度との関係を調べたところ、図４（ａ）に示すような結果となった。図４（ａ）に併記するように、上述した比較例の無段変速機用金属ベルト１０３，１０４の結果と比較すると、無段変速機用金属ベルト１０は、比較例のものよりも振幅及び騒音レベルの双方とも小さくなる。従って、無段変速機用金属ベルト１０のように、フープ１２の全長に対して１％以上の長さを有する同厚エレメント群３０ａ，３０ｂを、上述した設計手順に則って導出された最適な配列で配置することにより、騒音の発生ピークの分散化、及び低振幅化を図ることが可能となる。 The continuously variable transmission metal belt 10 created by deriving and selecting the optimum arrangement of the same thickness element groups 30a and 30b as described above was rotated between the pulleys P1 and P2 of the continuously variable transmission. Regarding the noise in the case, the relationship between the amplitude and noise level (noise level) and the occurrence frequency was examined, and the result shown in FIG. 4A was obtained. 4A, when compared with the results of the above-described comparative example continuously variable transmission metal belts 103 and 104, the continuously variable transmission metal belt 10 has an amplitude and Both noise levels are reduced. Therefore, like the metal belt 10 for continuously variable transmission, the same-thickness element groups 30a and 30b having a length of 1% or more with respect to the entire length of the hoop 12 are optimally derived in accordance with the design procedure described above. By arranging in an array, it is possible to achieve dispersion of noise generation peaks and reduction in amplitude.
また、上述した無段変速機用金属ベルト１０の設計方法によれば、騒音の発生ピークの分散化、及び低振幅化を図る上で最適な同厚エレメント群の配列を容易に導出することができる。これにより、無段変速機において発生する騒音を最小限に抑制可能な無段変速機用金属ベルト１０を容易かつ精度良く設計することが可能となり、設計に要する手間及びコストを最小限に抑制できる。 In addition, according to the above-described design method of the continuously variable transmission metal belt 10, it is possible to easily derive an optimal arrangement of elements having the same thickness in order to disperse noise generation peaks and reduce the amplitude. it can. As a result, the continuously variable transmission metal belt 10 capable of minimizing noise generated in the continuously variable transmission can be easily and accurately designed, and the effort and cost required for the design can be minimized. .
本発明の無段変速機用金属ベルトは、ＣＶＴを搭載した車両において好適に利用することができる。 The metal belt for continuously variable transmission of the present invention can be suitably used in a vehicle equipped with a CVT.
１０ 無段変速機用金属ベルト
１２ フープ
２０ エレメント
３０ 同厚エレメント群
Ｐ１，Ｐ２ プーリ
10 Metal belt for continuously variable transmission 12 Hoop 20 Element 30 Same thickness element group P1, P2 Pulley
Claims (2)
厚みが同一である前記エレメントを前記無端環状体に沿って連続的に配置した同厚エレメント群を複数有し、
前記同厚エレメント群のそれぞれが、前記無端環状体の全長に対して１％以上の長さを有するものであることを特徴とする無段変速機用金属ベルト。 A metal belt for continuously variable transmission formed by arranging a plurality of types of elements having different thicknesses along an endless annular body,
A plurality of elements having the same thickness, wherein the elements having the same thickness are continuously arranged along the endless annular body;
Each of the same-thickness element groups has a length of 1% or more with respect to the total length of the endless annular body.
前記同厚エレメント群の配列として想定されるものを導出する配列導出工程と、
前記配列導出工程において導出された配列の一部又は全部につき、当該配列を有する無段変速機用金属ベルトを所定の無段変速機に用いた場合における騒音の発生レベルを導出する騒音導出工程と、
前記騒音導出工程において導出された騒音の発生レベルのうち最も低いものに相当する同厚エレメント群の配列を導出する配列選定工程とを有することを特徴とする無段変速機用金属ベルトの設計方法。 A plurality of elements having the same thickness are formed by arranging a plurality of types of elements having different thicknesses along the endless annular body, and continuously arranging the elements having the same thickness along the endless annular body. Each of the same-thickness element groups is a design method for a continuously variable transmission metal belt having a length of 1% or more with respect to the total length of the endless annular body,
An array derivation step for deriving what is assumed as the array of the same-thickness element groups;
A noise deriving step for deriving a noise generation level when a metal belt for continuously variable transmission having the arrangement is used for a predetermined continuously variable transmission for a part or all of the arrangement derived in the arrangement deriving step; ,
A method for designing a metal belt for a continuously variable transmission, comprising: an array selection step for deriving an array of elements having the same thickness corresponding to the lowest noise generation level derived in the noise deriving step. .
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| JP2017500517A (en) * | 2013-12-24 | 2017-01-05 | ローベルト ボツシユ ゲゼルシヤフト ミツト ベシユレンクテル ハフツングＲｏｂｅｒｔ Ｂｏｓｃｈ Ｇｍｂｈ | Method for assembling drive belts with various types of cross members for continuously variable transmissions, and drive belts thus assembled |
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Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |