JP3665684B2 - Eccentric ring of variable speed pulley - Google Patents

Description

【００２２】
上記の実施例１〜３および比較例１〜６の偏心リングを、可変速プーリに用いて、耐摩耗性、試料温度、摩擦係数、相手攻撃性および振動について評価試験を行ったところ、表１に示す結果を得た。
なお、試験は異なる周速を持つ２枚のディスクにおいて、互いの外周部を押し付け、接触点に強制的にすべりを発生させて行い、ディスクの試料温度、摩擦係数、振動を測定した。また、ディスクの摩耗量を測定することで、耐摩耗性、相手攻撃性を評価した。
【００２３】
試験結果における判断基準は、耐摩耗性では、ディスク摩耗なしを○とし、摩耗発生を×とした。試料温度では、６０°Ｃ以下を○とし、６０°Ｃを超える場合を×とした。
また、摩擦係数では、０．２〜０．４で変動がない場合を○とし、それ以外を×とした。相手攻撃性では、相手ディスクの摩耗がない場合を○とし、摩耗発生を×とした。振動では、振動が発生した場合を×とした。
【００２４】
表１の試験結果から下記のことが判明した。
1) 実施例１〜３の試験結果から、アラミド繊維（芳香族ポリアミド繊維）が１５〜２５重量％、非線形無機充填材が５〜２０重量％、グラファイトが５〜２０重量％であれば、耐摩耗性、試料温度、摩擦係数、相手攻撃性および振動の全ての点で良好であった。
2) 比較例１では、アラミド繊維が３０重量％と多く含まれているために偏心リングが硬くなり過ぎて、相手攻撃性が大であり、また、グラファイトが３重量％と少ないために摩擦係数が大きくなって試料温度が上昇して不良となり、また、タルクが２５重量％と多いために脆く強度不足となった。
3) 比較例２では、アラミド繊維が１０重量％と少ないために摩耗が大となり、また、グラファイトが２５重量％と多く且つタルクが３重量％と少ないために摩擦係数が小さくなり過ぎる。
4) 比較例３では、グラファイトは１５重量％と好ましい範囲にあるものの、強化材としてカーボン繊維が含まれているため、相手攻撃性が大となり、しかもタルクが含まれていないので摩擦係数が低くなり過ぎる。
5) 比較例４では、グラファイトは重量％と好ましい範囲にあるものの、カーボン繊維が含まれているため相手攻撃性が大であった。また、タルクが含まれていないために摩擦係数に関して良好でなかった。
6) 比較例５では、アラミド繊維、グラファイトおよびタルクはそれぞれ好ましい範囲にあるものの、カーボン繊維が含まれていることから、相手攻撃性が大であった。
7) 比較例６では、グラファイトは含まれているものの、多量のカーボン繊維が含まれているので、相手攻撃性が大であった。
8) 比較例７では、アラミド繊維が含まれているものの、カーボン繊維が含まれているため、相手攻撃性が大であった。また、比較例７において、耐摩耗性が悪く振動が大であったのは、ＭｏＳ₂ の固体潤滑剤としての効果がなかった為と推察される。
9) ＰＴＦＥに関しては、比較例４〜６の結果からみて、グラファイトと比較して摩擦係数の安定に対する効果が小であると推察される。
10) ＢＰに関しては、比較例４と比較例６の結果からみて、摩擦調整剤として効果がないと推察される。
【００２５】
【発明の効果】
このように、本発明では、樹脂材料として、フェノール樹脂に、芳香族ポリアミド繊維、非線形無機充填材およびグラファイトを配合したものを用いているので、成形体としては、自身は耐摩耗性に優れているにもかかわらず相手部材への攻撃性は緩やかであり、しかも、温度にかかわらず安定した適度な摩擦係数を持つことになる。したがって、可変速プーリの偏心リングへの適用に適している。
【００２６】
また、フェノール樹脂への芳香族ポリアミド繊維、非線形無機充填材およびグラファイトの配合割合を、芳香族ポリアミド繊維：１５〜２５重量％、非線形無機充填材：５〜２０重量％、グラファイト：５〜２０重量％の範囲とすることにより、耐磨耗性をより向上させ、摩擦係数をより安定させることができる。
特に、非線形無機充填材がタルクであれば、摩擦力の調整を行い易い。
【図面の簡単な説明】
【図１】本発明の一実施形態の動力伝達部材としての偏心リングを含む可変速プーリの断面図である。
【図２】（ａ），（ｂ）はそれぞれ本発明の他の実施形態における偏心リングの要部断面図である。
【符号の説明】
１，１０ 偏心リング[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an eccentric ring of the variable speed pulley.
[0002]
[Prior art and problems to be solved by the invention]
In recent years, variable speed pulleys that can change the contact diameter of the belt have been provided. In this variable speed pulley, the type in which the V belt is wound directly around the V groove of the pulley and the V groove of the pulley are fitted. Some types have a flat belt wrapped around an eccentric ring.
[0003]
In the latter case, torque is transmitted between the eccentric ring and the member forming the V-groove, but the surface pressure becomes very high because the area of the contact portion between them is small. Moreover, in the said contact part, the very complicated contact state in which the rolling motion for torque transmission and the sliding motion for eccentricity exist together.
On the other hand, conventionally, since metal has been used as a material constituting the eccentric ring, there have been problems such as seizure and increased wear of members forming the V-groove.
[0004]
Therefore, it is conceivable to use a resin for the eccentric ring. However, when a general resin is used, the wear of the eccentric ring becomes large, or the transmission torque is not stable as a result of unstable friction. In addition, the contact portion may be melted.
In other words, the resin molded body used for the eccentric ring has a moderate attack coefficient against the mating member despite being excellent in wear resistance, and has a stable and suitable friction coefficient regardless of the temperature. It will be required to have.
[0005]
An object of the present invention is to provide a wear hardly yet moderate eccentric ring of the friction coefficient lifting one variable speed pulley aggressiveness to mating member is small and temperature stable.
[0006]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention provides an eccentric ring for a variable speed pulley having a transmission surface for a belt on an outer peripheral surface thereof and disposed between the V grooves of the variable speed pulley, and dividing the V groove. A pair of V-groove forming bodies that are in contact with each other in a mixed state of rolling motion and sliding motion, and the whole or a portion in contact with the slope is made of phenol resin, aromatic polyamide fiber, nonlinear inorganic filler And an eccentric ring of a variable speed pulley formed by molding a resin material blended with graphite.
Phenol resins have the advantages of excellent heat resistance and rigidity, and do not melt and soften even at high temperatures, but are brittle and inherently have a very high coefficient of friction, making them difficult to use where slipping occurs. Therefore, aromatic polyamide fibers and nonlinear inorganic fillers were used as reinforcing materials in order to improve the brittleness of the phenol resin, and graphite was used as a solid lubricant in order to improve slidability.
[0007]
The above-mentioned aromatic polyamide fiber not only contributes to the improvement of mechanical strength as a reinforcing material, but also exerts a great effect on the improvement of wear resistance. Further, it can be found in conventional glass fibers and carbon fibers. In addition, there is little action to wear the mating member. Examples of aromatic polyamide fibers include DuPont's trade name Kevlar and trade name Nomex, and Teijin's trade name Conex. If the content of the aromatic polyamide fiber in the resin material is less than 15% by weight, there is a risk of cracking due to insufficient strength, and if it exceeds 25% by weight, it becomes too hard and wears the mating member. It is preferably in the range of 15 to 25% by weight.
[0008]
The nonlinear inorganic filler includes at least one selected from the group consisting of calcium carbonate, magnesium carbonate, silica powder, talc, clay, alumina, mica and gypsum. The content ratio of the nonlinear inorganic filler in the resin material is preferably in the range of 5 to 20% by weight because friction is increased when it is less than 5% by weight and brittle when it exceeds 20% by weight. In particular, talc is preferable if the nonlinear inorganic filler is easy to adjust the frictional force.
[0009]
An example of graphite used as an additive is CPB30 (medium super graphite industry). The content ratio of graphite to the resin material is preferably in the range of 5 to 20% by weight because slipping is poor when it is less than 5% by weight and brittle when it exceeds 20% by weight.
The present invention also provides an eccentric ring of a variable speed pulley, a pair of V grooves which have a transmission surface to the belt on the outer peripheral surface thereof and are arranged between the V grooves of the variable speed pulley and define the V groove. A resin material in which an aromatic polyamide fiber, talc, and graphite are blended with a phenol resin is in contact with the slope of the formed body in a contact state in which rolling motion and sliding motion are mixed, and the whole or a portion in contact with the slope. The content ratio of the aromatic polyamide fiber in the resin material is 15 to 25% by weight, the content ratio of graphite in the resin material is 5 to 20% by weight, and the talc in the resin material May be 5 to 20% by weight so that the friction coefficient is 0.2 to 0.4 .
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
First, an aromatic polyamide fiber, a non-linear inorganic filler, and graphite were added and kneaded with a phenol resin as a base resin in the following ratio to prepare a molding resin.
[0011]
Then, molding the molding resin, to obtain a eccentric ring 1 that apply to variable speed pulley A, as shown in FIG. The eccentric ring 1 has an annular shape with a substantially trapezoidal cross section, and a transmission surface 1a to the flat belt B is formed on the outer peripheral surface. A plurality of concave grooves 1b that mesh with the flat belt side are formed in the transmission surface 1a along the circumferential direction. The eccentric ring 1 is fitted in a V-groove 4 defined between a pair of V-groove forming bodies 2 and 3 that can adjust the distance between them. Tapered surfaces 1b and 1c respectively formed on both circumferential side surfaces of the eccentric ring 1 are in contact with the inclined surfaces 2a and 3a of the V-groove forming bodies 2 and 3, respectively. The tapered surfaces 1b and 1c are portions where there is a very complicated contact state in which a rolling motion for torque transmission and a sliding motion for eccentricity are mixed.
[0012]
In the above-described variable speed pulley A, screw portions 6 and 7 having opposite pitches and the same pitch are formed around a cylindrical rotating shaft 5 driven by the engine. The V groove forming bodies 2 and 3 are respectively screwed to the threaded portions 6 and 7, and the V groove forming bodies 2 and 3 are connected to each other so as to be integrally rotatable with each other by concave and convex fitting. Reference numeral 8 denotes a disc spring that urges the V-groove forming bodies 2 and 3 in a direction in which they are close to each other. In this variable speed pulley A, by increasing the belt tension, the eccentric ring 1 is eccentric from the axis 5a of the rotating shaft 5, and the contact diameter of the belt is changed.
[0013]
The above-mentioned aromatic polyamide fiber not only contributes to the improvement of mechanical strength as a reinforcing material, but also exerts a great effect on the improvement of wear resistance. Further, it can be found in conventional glass fibers and carbon fibers. In addition, there is little action to wear the counterpart member. The content ratio of the aromatic polyamide fiber in the resin material is preferably in the range of 15 to 25% by weight. This is because if it is less than 15% by weight, there is a risk of cracking due to insufficient strength, and if it exceeds 25% by weight, it becomes too hard and wears the mating member. Examples of aromatic polyamides include DuPont's trade name Kevlar and trade name Nomex, and Teijin's trade name Conex.
[0014]
The nonlinear inorganic filler includes at least one selected from the group consisting of calcium carbonate, magnesium carbonate, silica powder, talc, clay, alumina, mica and gypsum. The content ratio of the nonlinear inorganic filler in the resin material is preferably in the range of 5 to 20% by weight. This is because if the amount is less than 5% by weight, the friction increases, and if it exceeds 20% by weight, the material becomes brittle. In particular, talc is preferable if the nonlinear inorganic filler is easy to adjust the frictional force.
[0015]
An example of graphite used as an additive for improving slidability and improving wear resistance is CPB30 (medium super graphite industry). The content ratio of graphite to the resin material is preferably in the range of 5 to 20% by weight. This is because if the amount is less than 5% by weight, the slipping becomes worse, and if it exceeds 20% by weight, the material becomes brittle.
[0016]
In this embodiment, since the resin material is a mixture of a phenol resin and an aromatic polyamide fiber, a non-linear inorganic filler, and graphite, the molded body itself has excellent wear resistance. Regardless of the aggressiveness to the mating member, it has a moderate and stable coefficient of friction regardless of the temperature. Therefore suitable for application to the eccentric-ring. Moreover, the blending ratio of the aromatic polyamide fiber, the nonlinear inorganic filler and the graphite to the phenol resin is as follows: aromatic polyamide fiber: 15 to 25% by weight, nonlinear inorganic filler: 5 to 20% by weight, graphite: 5 to 20% by weight By setting it in the range of%, it is possible to further improve the wear resistance and stabilize the friction coefficient.
[0017]
In particular, if the nonlinear inorganic filler is talc, it is easy to adjust the frictional force.
In the above embodiment, the entire eccentric ring is made of resin. However, as shown in FIG. 2 (a), only the portion where the eccentric ring 10 is in contact with the slope of the V groove of the variable speed pulley is made of resin 20. The remaining portion may be made of metal 30. Further, as shown in FIG. 2 (b), the portion where the eccentric ring 10 is in contact with the flat belt and the inclined surface of the V-groove may be constituted by the resin 20 and the remaining portion may be constituted by the metal 30. In the embodiment of FIGS. 2A and 2B, the resin 20 and the metal 30 may be bonded to each other using an adhesive, or may be joined to each other by insert molding.
[0019]
【Example】
Examples 1-3 and Comparative Examples 1-7
Examples 1 to 3 and Comparative Examples were prepared by adding various fillers to the novolac-type phenolic resin, which is a base resin, in the proportions shown in Table 1 and preparing a molding resin by kneading. 1 to 6 eccentric rings were obtained.
[0020]
Examples 1 to 3 and Comparative Examples 1 and 2 are filled with aromatic polyamide fiber, graphite and talc. Comparative Example 3 is filled with carbon fiber and graphite. In Comparative Example 4, carbon fiber, graphite, PTFE and BP are filled. In Comparative Example 5, an aromatic polyamide fiber, graphite, talc, carbon fiber and PTFE are filled. In Comparative Example 6, carbon fiber, graphite and PTFE are filled. Comparative Example 7 is filled with carbon fiber, aromatic polyamide fiber and molybdenum disulfide. In Table 1, the aromatic polyamide fiber is represented as aramid F, and the carbon fiber is represented as carbon F.
[0021]
[Table 1]

[0022]
Using the eccentric rings of Examples 1 to 3 and Comparative Examples 1 to 6 as variable speed pulleys, an evaluation test was performed on wear resistance, sample temperature, coefficient of friction, opponent attack and vibration. Table 1 The result shown in was obtained.
The test was performed on two discs having different peripheral speeds by pressing the outer peripheral portions of each other and forcibly causing a slip at the contact point, and measuring the sample temperature, friction coefficient, and vibration of the disc. In addition, the wear resistance and opponent attack were evaluated by measuring the amount of wear of the disk.
[0023]
Judgment criteria in the test results were as follows: no wear of the disk in the abrasion resistance, and x in the occurrence of wear. With respect to the sample temperature, 60 ° C. or lower was evaluated as ◯, and the case where it exceeded 60 ° C. was evaluated as ×.
In addition, the friction coefficient was 0.2 to 0.4 when there was no fluctuation, and the others were marked with x. In the opponent aggression, the case where there was no wear of the opponent disk was marked with ◯, and the wear occurrence was marked with x. In the case of vibration, the case where vibration occurred was marked as x.
[0024]
From the test results of Table 1, the following was found.
1) From the test results of Examples 1 to 3, if the aramid fiber (aromatic polyamide fiber) is 15 to 25% by weight, the nonlinear inorganic filler is 5 to 20% by weight, and the graphite is 5 to 20% by weight, It was good in all aspects of wear, sample temperature, coefficient of friction, opponent attack and vibration.
2) In Comparative Example 1, since the aramid fiber is contained in a large amount of 30% by weight, the eccentric ring becomes too hard, the opponent's aggression is large, and the graphite is only 3% by weight, so that the friction coefficient is low. As the sample temperature increased, the sample temperature rose and became defective, and the talc content was as large as 25% by weight.
3) In Comparative Example 2, the amount of aramid fibers is as small as 10% by weight, so that the wear is large, and because the graphite is as large as 25% by weight and the talc is as small as 3% by weight, the friction coefficient is too small.
4) In Comparative Example 3, although graphite is in a preferable range of 15% by weight, the carbon fiber is included as a reinforcing material, so that the opponent's aggression is large, and since talc is not included, the friction coefficient is low. Too much.
5) In Comparative Example 4, although graphite was in the preferred range of wt%, the carbon fiber was included, so the opponent attack was large. Further, since talc was not included, the friction coefficient was not good.
6) In Comparative Example 5, although aramid fiber, graphite, and talc were in the preferred ranges, the carbon fiber was included, so the opponent attack was great.
7) In Comparative Example 6, although the graphite was contained, a large amount of carbon fiber was contained, so the opponent attack was great.
8) Although the aramid fiber was contained in the comparative example 7, since the carbon fiber was contained, the opponent attack property was large. In Comparative Example 7, the wear resistance was poor and the vibration was large. It is presumed that MoS ₂ was not effective as a solid lubricant.
9) Regarding PTFE, it is presumed that the effect on the stability of the friction coefficient is small compared to graphite, from the results of Comparative Examples 4 to 6.
10) Regarding BP, from the results of Comparative Examples 4 and 6, it is presumed that there is no effect as a friction modifier.
[0025]
【The invention's effect】
As described above, in the present invention, since a resin material blended with a phenol resin, an aromatic polyamide fiber, a non-linear inorganic filler, and graphite is used, the molded body itself has excellent wear resistance. In spite of this, the aggressiveness to the mating member is moderate, and it has a stable and appropriate coefficient of friction regardless of the temperature. Therefore suitable for application to the eccentric-ring of the variable speed pulley.
[0026]
Moreover, the blending ratio of the aromatic polyamide fiber, the nonlinear inorganic filler and the graphite to the phenol resin is as follows: aromatic polyamide fiber: 15 to 25% by weight, nonlinear inorganic filler: 5 to 20% by weight, graphite: 5 to 20% by weight By setting it in the range of%, it is possible to further improve the wear resistance and stabilize the friction coefficient.
In particular, if the nonlinear inorganic filler is talc, it is easy to adjust the frictional force.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a variable speed pulley including an eccentric ring as a power transmission member according to an embodiment of the present invention.
FIGS. 2A and 2B are cross-sectional views of main parts of an eccentric ring according to another embodiment of the present invention, respectively.
[Explanation of symbols]
1,10 Eccentric ring

Claims (3)

An eccentric ring of a variable speed pulley,
It has a transmission surface to the belt on its outer peripheral surface and is arranged between the V grooves of the variable speed pulley,
Contact with the slope of the pair of V-groove forming bodies defining the V-groove in a contact state in which rolling motion and sliding motion are mixed;
An eccentric ring of a variable speed pulley, wherein the whole or a part in contact with the slope is formed by molding a resin material in which an aromatic polyamide fiber, a nonlinear inorganic filler and graphite are blended with a phenol resin. An eccentric ring of a variable speed pulley,
It has a transmission surface to the belt on its outer peripheral surface and is arranged between the V grooves of the variable speed pulley,
Contact with the slope of the pair of V-groove forming bodies defining the V-groove in a contact state in which rolling motion and sliding motion are mixed;
The whole or a portion in contact with the slope is formed by molding a resin material in which an aromatic polyamide fiber, a nonlinear inorganic filler and graphite are blended with a phenol resin,
The content ratio of the aromatic polyamide fiber, the nonlinear inorganic filler and the graphite in the resin material is as follows:
Aromatic polyamide fiber: 15-25% by weight
Non-linear inorganic filler: 5-20% by weight
Graphite: 5-20% by weight
An eccentric ring of a variable speed pulley characterized by being in the range of An eccentric ring of a variable speed pulley,
It has a transmission surface to the belt on its outer peripheral surface and is arranged between the V grooves of the variable speed pulley,
Contact with the slope of the pair of V-groove forming bodies defining the V-groove in a contact state in which rolling motion and sliding motion are mixed;
The whole or a portion in contact with the slope is formed by molding a resin material in which an aromatic polyamide fiber, talc and graphite are blended with a phenol resin,
The content ratio of the aromatic polyamide fiber in the resin material is 15 to 25% by weight,
The content ratio of graphite in the resin material is 5 to 20% by weight,
An eccentric ring of a variable speed pulley, wherein the content ratio of talc in the resin material is 5 to 20% by weight so that the friction coefficient is 0.2 to 0.4.

Images