JP4257476B2 - Manufacturing method of flexible coupling - Google Patents

Description

ここで、
φ１；フレキシブルカップリング１における連結環３０，３０，…のピッチ
（図５参照）
φ２；後述する一次成形時における連結環３０，３０，…のピッチ
（図１参照）
【００１９】
また、このフレキシブルカップリング１には、第一及び第二連結帯４０，５０に弛みを与えるための挿入部材が存在しないため、部品点数が多くならず、前記部材との摩擦による第一及び第二連結帯４０，５０の摩耗や、捩り角の増大時に前記挿入部材に起因する弾性体６０の亀裂の発生等も生じ得ない。
【００２０】
上記構成のフレキシブルカップリング１は、以下に述べる方法によって製造することができる。
【００２１】
まず、図１に示されるように、ピッチφ２の円周上に６０°の位相間隔で配置した固定軸２，２，…に、それぞれ連結環３０，３０，…を外挿固定し、円周方向に隣り合う連結環３０，３０，…に、第一連結帯４０及び第二連結帯５０を交互に巻き掛ける。なお、前記固定軸２，２，…のピッチφ２は、図５に示される製品としてのフレキシブルカップリング１における連結環３０，３０，…(駆動側接続子１０及び従動側接続子２０)のピッチφ１よりも若干大きく設定されている。また、先に説明した図２に示されるように、第一連結帯４０は、連結環３０におけるカラー３２，３３の間の部分に巻き掛けられ、第二連結帯５０は、両側のカラー３２，３３に巻き掛けられる。
【００２２】
次に、上述の状態で、連結環３０，３０，…と第一及び第二連結帯４０，５０の結束物を一次成形用金型３の成形空間に組み込んでから、エラストマ成形材料を充填して加硫成形する。このとき、前記第一連結帯４０及び第二連結帯５０は、隣り合う連結環３０，３０間に、所定の張力を与えた状態で巻き掛けられているため、前記成形空間へのエラストマ成形材料の充填によって、前記連結帯４０，５０の繊維がばらついたり、弛んだりすることがない。
【００２３】
一次成形用金型３の成形空間は、各連結環３０を包囲する円形の基部成形空間１０１と、円周方向に隣り合う前記基部成形空間１０１，１０１間を延びて、第一連結帯４０又は第二連結帯５０を包囲する外周連絡部成形空間１０２及び内周連絡部成形空間１０３からなる。また、前記外周連絡部成形空間１０２における延長方向中間位置には、外周側へ凹んだ凹所１０２ａが形成されており、前記内周連絡部成形空間１０３における延長方向中間位置には、内周側へ凹んだ凹所１０３ａが形成されている。
【００２４】
図３は、上述の一次成形用金型３によって成形された一次成形体１Ａを示すものである。この一次成形体１Ａは、各連結環３０と、第一及び第二連結帯４０，５０を、一次成形用金型３の成形空間と対応する形状の弾性体内層部６０Ａで被覆した構造であって、前記弾性体内層部６０Ａは、各連結環３０の外周側を包囲している六ケ所の基部６１Ａと、円周方向に隣り合う前記基部６１Ａ，６１Ａの間を延びて、第一連結帯４０又は第二連結帯５０の周囲を包囲している外周及び内周連絡部６２Ａ，６３Ａからなり、各外周連絡部６２Ａには、一次成形用金型３における凹所１０２ａと対応して、外周側へ突出した凸部６４が、また、各内周連絡部６３Ａには、一次成形用金型３における凹所１０３ａと対応して、内周側へ突出した凸部６５が、それぞれ形成されている。
【００２５】
次に、図４に示されるように、図５に示される製品としてのフレキシブルカップリング１における連結環３０，３０，…(駆動側接続子１０及び従動側接続子２０)と同一ピッチφ１の円周上に、６０°の位相間隔で配置した固定軸４，４，…に、上述の一次成形体１Ａの各連結環３０，３０，…を外挿固定し、この状態で、前記一次成形体１Ａを二次成形用金型５の成形空間に組み込む。
【００２６】
二次成形用金型５の成形空間は、一次成形体１Ａにおける弾性体内層部６０Ａの各基部６１Ａを包囲する円形の基部成形空間２０１と、円周方向に隣り合う前記基部成形空間２０１，２０１間を直線状に延びて、一次成形体１Ａにおける外周及び内周連絡部６２Ａ，６３Ａを包囲する外周連絡部成形空間２０２及び内周連絡部成形空間２０３からなる。また、前記成形空間における基部成形空間２０１の内面と前記基部６１Ａとの隙間Ｇは、前記外周及び内周連絡部６２Ａ，６３ａに形成された凸部６４，６５の径方向高さよりも小さいものとなっている。
【００２７】
上述のように、一次成形体１Ａにおける各連結環３０を固定している固定軸４，４，…のピッチφ１は、一次成形用金型３による成形時の連結環３０，３０，…のピッチφ２より小さいため、固定軸４，４，…に固定された連結環３０，３０，…の間隔が縮小され、その間を延びる外周連絡部６２Ａ及び内周連絡部６３Ａに所定の弛みを与えることができる。一方、前記一次成形体１Ａにおける弾性体内層部６０Ａに形成された凸部６４，６５の高さは、二次成形用金型５の成形空間における基部成形空間２０１の内面と、前記一次成形体１Ａにおける基部６１Ａとの隙間Ｇより大きいため、前記各凸部６４が外周連絡部成形空間２０２の内面に当接して、前記外周連絡部６２Ａの中間部を外周連絡部成形空間２０２の内周側へ偏在させるように押し、また、前記各凸部６５が内周連絡部成形空間２０３の内面に当接して、内周連絡部６３Ａの中間部を、内周連絡部成形空間２０３の外周側へ偏在させるように押す。
【００２８】
このため、成形空間の外周連絡部成形空間２０２内を通る第一連結帯４０又は第二連結帯５０の中間部分と、内周連絡部成形空間２０３内を通る第一連結帯４０又は第二連結帯５０が、径方向へ互いに近接するように、弾性体内層部６０Ａにおける外周連絡部６２Ａ及び内周連絡部６３Ａと共に弛む。
【００２９】
次に、上述のように一次成形体１Ａをセットした二次成形用金型５の成形空間に、エラストマ成形材料を充填することによって、前記一次成形体１Ａの外周に所要の厚みの弾性体外層部（図示省略）を一体的に加硫成形する。このとき、多層の線材４１，５１からなる第一連結帯４０及び第二連結帯５０は、エラストマ（外周連絡部６２Ａ，内周連絡部６３Ａ）で被覆されているので、前記エラストマ成形材料の充填によって、前記連結帯４０，５０の繊維密度がバラついたりすることがなく、前記連結帯４０，５０の弛み量は、一次成形体１Ａにおける凸部６４，６５によって規定されるので、弛み量のばらつきも生じない。
【００３０】
二次成形用金型５による成形後は、連結環３０，３０，…に駆動側接続子１０及び従動側接続子２０を交互に嵌着し、これによって図５に示される構造のフレキシブルカップリング１となる。
【００３１】
なお、本発明は、図示の実施形態によって限定的に解釈されるものではない。例えば、連結環３０，３０，…の配置間隔は、必ずしも図示のように円周方向６等配である必要はなく、装着対象の軸端ヨークの仕様等に対応して決定されるものである。
【００３２】
【発明の効果】
本発明に係るフレキシブルカップリングの製造方法によれば、連結帯を被覆した一次成形体を成形してから、前記連結帯に各連結環の間で弛みを与えた状態で、弾性体を二次成形することによって、二段特性を有するフレキシブルカップリングを製造するものであるため、円周方向に隣り合う連結環の間で連結帯に弛みを与えるにも拘らず、弾性体の成形時に、金型内への成形材料の充填によって、連結帯の繊維密度や弛み量のばらつきが発生せず、このため、一部の連結帯で入力トルクが過大になることがなく、耐久性に優れたフレキシブルカップリングを提供することができる。しかも、連結帯に弛みを与えるための部材が不要であるため、部品点数が多くならず、前記部材に起因する耐久性の低下も防止することができる。
【図面の簡単な説明】
【図１】本発明に係るフレキシブルカップリングの製造方法の好ましい実施の形態における一次成形体の成形工程を示す説明図である。
【図２】上記製造方法において第一及び第二連結帯が巻き掛けられた連結環を、その内周の接続子と共に、軸心を通る平面で切断して示す部分断面図である。
【図３】上記実施形態の製造方法によって得られた一次成形体を示す、一部断面を表す外観図である。
【図４】上記製造方法における二次成形体の成形工程を示す説明図である。
【図５】上記製造方法によって製造されたフレキシブルカップリングを示す、一部断面を表す外観図である。
【図６】上記フレキシブルカップリングの捩りばね特性を示す特性線図である。
【図７】連結帯に弛みのない構造とした比較例としてのフレキシブルカップリングの捩りばね特性を示す特性線図である。
【符号の説明】
１ フレキシブルカップリング
１Ａ 一次成形体
２，４ 固定軸
３ 一次成形用金型
５ 二次成形用金型
１０ 駆動側接続子
２０ 従動側接続子
３０ 連結環
３１ スリーブ
３２，３３ カラー
４０ 第一連結帯
４１，５１ 線材
５０ 第二連結帯
６０ 弾性体
６０Ａ 弾性体内層部
６０ａ 窓部
６１，６１Ａ 基部
６２，６２Ａ 外周連絡部
６３，６３Ａ 内周連絡部
６４，６５ 凸部
１０１，２０１ 基部成形空間
１０２，２０２ 外周連絡部成形空間
１０２ａ，１０３ａ 凹所
１０３，２０３ 内周連絡部成形空間[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for manufacturing a flexible coupling that elastically connects shaft ends of a drive side rotary shaft and a driven side rotary shaft.
[0002]
In this type of flexible coupling, a plurality of drive side connection rings and driven side connection rings are alternately arranged in the circumferential direction, and the drive side connection ring and the driven side connection ring adjacent to each other in the circumferential direction have some slack. There is a structure in which fibers are connected by a connection band in which fibers are wound in a loop shape, and the connection ring and the connection band are embedded in rubber. The typical prior art is disclosed in, for example, Japanese Patent Application Laid-Open No. 62-292924 or Japanese Patent No. 2773348.
[0003]
In the flexible coupling, each driving side connecting ring is attached to the shaft end of the driving side rotating shaft at equal intervals in the circumferential direction, while each driven side connecting ring is connected to the shaft end of the driven side rotating shaft in the circumferential direction or the like. It is mounted at intervals and transmits power from the drive side to the driven side. When rotational torque is input, the torsional rigidity is maintained until the loosening of the connection band between the drive side connection ring and the driven side connection ring is eliminated. Has a two-stage characteristic that exhibits excellent vibration-absorbing effect since the torque is kept small, and that when the connecting band is stretched linearly, the torsional rigidity is increased and a large torque transmission force is exhibited.
[0004]
[Problems to be solved by the invention]
However, if the connection band is slackened between the adjacent drive side connection ring and the driven side connection ring in order to make the torsional characteristics two-stage characteristics, the molding material is filled in the mold during rubber molding. The fiber density of the connecting band varies and the amount of looseness tends to vary. For this reason, each connection band cannot share the input torque uniformly, that is, the input torque becomes excessive in some of the connection bands, and the durability may be reduced.
[0005]
In addition, according to the above prior art, since an insertion member for giving slack to the connection band is required, not only the number of parts is increased, but the insertion member is in contact with the connection band, so The wear of the connecting band is promoted, and there is a risk of early breakage. In addition, it is pointed out that when the torsion angle is increased by torque input, the insertion member is likely to be detached from the connection band, or the rubber is cracked around the insertion member.
[0006]
The present invention has been made in view of the problems as described above, and the main technical problem is that it satisfies both vibration absorption and shock absorbing properties at the time of initial torque input, and torque transmission force. The object is to provide a flexible coupling with excellent durability.
[0007]
[Means for Solving the Problems]
In order to effectively solve the technical problem described above, the manufacturing method of the flexible coupling according to the present invention includes an even number of connecting rings arranged at predetermined intervals in the circumferential direction, and the connecting rings adjacent to each other in the circumferential direction. The first and second connecting bands wound in a loop shape are alternately connected in the circumferential direction, set in a primary molding die, and the first and second connecting bands are covered with an elastic body layer portion. A molded body is molded, and the primary molded body is placed in a secondary molding die in a state in which the first and second coupling bands are slackened between the coupling rings via the elastic body layer portion. The elastic outer layer portion having a required thickness is molded on the outer periphery of the primary molded body.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
1 to 3 show a preferred embodiment of a method for manufacturing a flexible coupling according to the present invention. In the following description, “circumferential direction” refers to a circumferential direction around the axis of the flexible coupling.
[0009]
The flexible coupling to be manufactured in this manufacturing method has a structure as shown in FIG. That is, the flexible coupling 1 includes three drive-side connectors 10 arranged at intervals of 120 ° in the circumferential direction, and three phases at intervals of 120 ° in the circumferential direction at a phase different from the drive-side connectors 10 by 60 °. The driven-side connectors 20 arranged individually, the connection rings 30 mounted on the outer periphery of each of the connectors 10, 20, the connection rings 30 and the driven-side connections on the outer periphery of the drive-side connector 10 adjacent in the circumferential direction. The first and second connection bands 40 and 50 that are alternately wound in the circumferential direction over the connection ring 30 on the outer periphery of the child 20 and the connection rings 30 and the connection bands 40 and 50 are covered. And an elastic body 60 made of an elastomer vulcanized.
[0010]
The drive side connector 10 and the driven side connector 20 are made of a cylindrical metal member, and are arranged so that the axis thereof is parallel to the axis of the flexible coupling 1. Further, as shown in FIG. 2, the connecting ring 30 is fixed to the metal sleeve 31 into which the driving side connector 10 or the driven side connector 20 is press-fitted and the outer peripheral surfaces of both axial ends thereof. It consists of a pair of metal collars 32 and 33 having a substantially U-shaped cross section.
[0011]
As shown in FIG. 2, the first and second connection bands 40 and 50 are obtained by winding wire rods 41 and 51 made of a polymer material having a required tensile elasticity, such as polyester, in a multilayer shape. . Of these, the first connecting band 40 is adjacent to the portion between the collars 32 and 33 on the outer periphery of the sleeve 31 of the connecting ring 30 attached to the driving side connector 10 and the driving side connector 10 in the circumferential direction. It is wound in a loop over the portion between the collars 32 and 33 on the outer periphery of the sleeve 31 of the connecting ring 30 attached to the driven connector 20. The second connection band 50 is attached to the inside of the collars 32 and 33 of the connection ring 30 attached to the driven connector 20 and to the drive connector 10 adjacent to the driven connector 20 in the circumferential direction. The connecting ring 30 is looped around the collars 32 and 33.
[0012]
In other words, the drive side connectors 10 and the driven side connectors 20 are alternately arranged at intervals of 60 °, and the first connection band 40 wound around the middle of the connection rings 30, 30,. Are connected alternately in the circumferential direction by second connection bands 50 wound around the axial ends of the connection rings 30, 30,.
[0013]
The elastic body 60 is shaped so as to wrap around the connection rings 30, 30,... And the first and second connection bands 40, 50 extending therebetween. Specifically, the first connection band 40 or the second connection extends linearly between the six bases 61 surrounding the outer peripheral side of each connection ring 30 and the bases 61 and 61 adjacent in the circumferential direction. It consists of the outer periphery and the inner periphery connection parts 62 and 63 surrounding the circumference | surroundings of the belt | band | zone 50, and the window part 60a is each between these.
[0014]
Further, the first and second connecting bands 40, 50 extend in a slack shape so as to be unevenly distributed toward the window portion 60a inside the outer peripheral connecting portion 62 and the inner peripheral connecting portion 63 of the elastic body 60. That is, the distance L1 between the intermediate portion of the first connecting band 40 passing through the outer periphery connecting portion 62 and the intermediate portion of the first connecting band 40 passing through the inner peripheral connecting portion 63 is the first distance of the sleeve 31 in the connecting ring 30. Similarly, an intermediate portion of the second connecting band 50 that is smaller than the connecting band winding diameter d1 (see FIG. 2) and passes through the outer periphery connecting portion 62, and an intermediate portion of the second connecting band 50 that passes through the inner peripheral connecting portion 63. The distance L2 is smaller than the second connection band winding diameter d2 (see FIG. 2) of the collars 32 and 33 in the connection ring 30.
[0015]
In the flexible coupling 1 having the above-described configuration, each drive-side connector 10 is attached to the yoke at the shaft end of the drive-side rotating shaft at intervals of 120 ° in the circumferential direction by bolts (not shown) inserted therethrough, Each driven-side connector 20 is attached to the yoke of the shaft end of the driven-side rotary shaft facing the shaft end of the drive-side rotary shaft at 120 ° intervals in the circumferential direction by bolts (not shown) inserted therethrough. . As a result, the rotation of the drive side rotating shaft is transmitted to the driven side rotating shaft via the first connecting band 40 or the second connecting band 50, and the first and second connecting bands 40, 50 and the elastic body 60 are deformed. Depending on the characteristics, rotation transmission is allowed in a state in which the directions of the shaft centers of the driving side rotating shaft and the driven side rotating shaft are different, and vibration is absorbed between the two shafts.
[0016]
Specifically, when the drive side rotary shaft and the driven side rotary shaft are relatively torsionally displaced by the input of torque, the first connection band is provided at a portion where the drive side connector 10 and the driven side connector 20 are relatively separated from each other. 40 or the second connection band 50 is extended from the slack shape between the connection rings 30 and 30. And in the process until the 1st connection belt | band | zone 40 or the 2nd connection belt | band | zone 50 is extended linearly, the outer periphery connection part 62 of the elastic body 60 integrated with this is the outer diameter direction, and the inner periphery connection part 63 Since it is flexibly deformed in the inner diameter direction, it exhibits an appropriate torsion spring property, thereby exhibiting an effective buffer function and vibration absorbing function.
[0017]
Further, the first connecting band in the portion where the driving side connector 10 and the driven side connector 20 are relatively separated by increasing the amount of torsional displacement between the driving side rotating shaft and the driven side rotating shaft more than a predetermined amount. When the slack of the 40 or the second connection band 50 is eliminated and the straight connection state is reached, the torsion spring constant is increased by the tensile elasticity of the first connection band 40 or the second connection band 50 from this point. For this reason, excessive torsional displacement between the drive side connector 10 and the driven side connector 20 is suppressed, and reliable torque transmission is performed.
[0018]
FIG. 6 is a characteristic diagram obtained by measuring the torsion spring characteristics of the flexible coupling 1 shown in FIG. As is apparent from this figure, until the first connection band 40 or the second connection band 50 is stretched linearly, the vibration absorption region α has a low torsion spring constant, and in a region where the torsion angle is larger than that, the torsion spring The torque transmission region β has a high constant. On the other hand, as shown in FIG. 7, the flexible coupling having a structure in which the connection bands 40 and 50 are not slack has a high torsion spring constant from the initial torsion, and there is no significant vibration absorption region α. The vibration absorption region α can be expressed by the following equation.
[Expression 1]

here,
φ1: Pitch of connecting rings 30, 30,... in flexible coupling 1 (see FIG. 5)
φ2: Pitch of connecting rings 30, 30,... in primary molding described later (see FIG. 1)
[0019]
In addition, since there is no insertion member for giving looseness to the first and second connection bands 40, 50 in the flexible coupling 1, the number of parts does not increase, and the first and second due to friction with the member. Neither the wear of the two connecting bands 40, 50 nor the occurrence of cracks in the elastic body 60 due to the insertion member when the torsion angle is increased.
[0020]
The flexible coupling 1 having the above-described configuration can be manufactured by the method described below.
[0021]
First, as shown in FIG. 1, connecting rings 30, 30,... Are extrapolated and fixed to fixed shafts 2, 2,. The first connection band 40 and the second connection band 50 are alternately wound around the connection rings 30, 30,. The pitch φ2 of the fixed shafts 2, 2,... Is the pitch of the connecting rings 30, 30,... (The driving side connector 10 and the driven side connector 20) in the flexible coupling 1 as the product shown in FIG. It is set slightly larger than φ1. Further, as shown in FIG. 2 described above, the first connection band 40 is wound around a portion between the collars 32 and 33 in the connection ring 30, and the second connection band 50 is connected to the collars 32 and 33 on both sides. 33.
[0022]
Next, in the state described above, the bundle of the connection rings 30, 30,... And the first and second connection bands 40, 50 is incorporated into the molding space of the primary molding die 3 and then filled with the elastomer molding material. Vulcanize and mold. At this time, since the first connection band 40 and the second connection band 50 are wound between adjacent connection rings 30 and 30 with a predetermined tension applied thereto, an elastomer molding material into the molding space is used. As a result, the fibers of the connecting bands 40 and 50 do not vary or loosen.
[0023]
The molding space of the primary molding die 3 extends between the circular base molding space 101 surrounding each coupling ring 30 and the base molding spaces 101, 101 adjacent to each other in the circumferential direction, and the first coupling band 40 or The outer connecting portion forming space 102 and the inner connecting portion forming space 103 surrounding the second connecting band 50 are formed. In addition, a recess 102a that is recessed toward the outer peripheral side is formed at the intermediate position in the extension direction in the outer peripheral connection portion molding space 102, and the inner peripheral side is located at the intermediate position in the extension direction in the inner peripheral connection portion molding space 103. A concave 103a is formed.
[0024]
FIG. 3 shows a primary molded body 1A molded by the primary molding die 3 described above. This primary molded body 1A has a structure in which each coupling ring 30 and first and second coupling bands 40, 50 are covered with an elastic body layer portion 60A having a shape corresponding to the molding space of the primary molding die 3. The elastic body layer portion 60A extends between the six base portions 61A surrounding the outer peripheral side of each connection ring 30 and the base portions 61A and 61A adjacent in the circumferential direction, thereby forming the first connection band 40. Or it consists of the outer periphery and inner periphery connection part 62A, 63A which surrounds the circumference | surroundings of the 2nd connection belt | band | zone 50, and each outer periphery connection part 62A corresponds to the recessed part 102a in the metal mold | die 3 for primary molding, and the outer peripheral side A convex portion 64 projecting toward the inner peripheral side is formed in each inner peripheral connecting portion 63A corresponding to the recess 103a in the primary molding die 3. .
[0025]
Next, as shown in FIG. 4, a circle having the same pitch φ1 as the connecting rings 30, 30,... (The driving side connector 10 and the driven side connector 20) in the flexible coupling 1 as the product shown in FIG. On the periphery, the connecting rings 30, 30,... Of the primary molded body 1A are extrapolated and fixed to fixed shafts 4, 4,... Arranged at a phase interval of 60 °. 1A is incorporated into the molding space of the secondary molding die 5.
[0026]
The molding space for the secondary molding die 5 includes a circular base molding space 201 surrounding each base 61A of the elastic body layer portion 60A in the primary molded body 1A and the base molding spaces 201, 201 adjacent to each other in the circumferential direction. The outer periphery connecting portion forming space 202 and the inner periphery connecting portion forming space 203 that extend in a straight line and surround the outer periphery and inner periphery connecting portions 62A, 63A in the primary molded body 1A. Further, the gap G between the inner surface of the base molding space 201 and the base 61A in the molding space is smaller than the radial height of the convex portions 64 and 65 formed in the outer and inner peripheral connecting portions 62A and 63a. It has become.
[0027]
As described above, the pitch φ1 of the fixed shafts 4, 4,... Fixing the connection rings 30 in the primary molded body 1A is the pitch of the connection rings 30, 30,. Since it is smaller than φ2, the distance between the connecting rings 30, 30,... fixed to the fixed shafts 4, 4,... is reduced, and a predetermined slack is imparted to the outer periphery connecting portion 62A and the inner periphery connecting portion 63A extending therebetween. it can. On the other hand, the height of the convex portions 64 and 65 formed on the elastic body layer portion 60A in the primary molded body 1A is such that the inner surface of the base molding space 201 in the molding space of the secondary molding die 5 and the primary molded body. Since each gap 64 is larger than the gap G with the base 61A in 1A, each of the convex portions 64 comes into contact with the inner surface of the outer peripheral connecting portion forming space 202, and the intermediate portion of the outer peripheral connecting portion 62A is the inner peripheral side of the outer peripheral connecting portion forming space 202. Further, the convex portions 65 abut against the inner surface of the inner peripheral connecting portion forming space 203, and the intermediate portion of the inner peripheral connecting portion 63A is moved to the outer peripheral side of the inner peripheral connecting portion forming space 203. Press to make it unevenly distributed.
[0028]
For this reason, the intermediate part of the 1st connection band 40 or the 2nd connection band 50 which passes the inside of the outer periphery connection part molding space 202 of a shaping | molding space, and the 1st connection band 40 or the 2nd connection which passes the inside of the inner periphery connection part shaping | molding space 203 The band 50 is loosened together with the outer peripheral connecting portion 62A and the inner peripheral connecting portion 63A in the elastic body layer portion 60A so as to be close to each other in the radial direction.
[0029]
Next, an elastic outer layer having a required thickness is formed on the outer periphery of the primary molded body 1A by filling the molding space of the secondary molding die 5 in which the primary molded body 1A is set as described above with an elastomer molding material. The parts (not shown) are integrally vulcanized. At this time, since the first connection band 40 and the second connection band 50 made of the multi-layered wires 41 and 51 are covered with the elastomer (the outer periphery connection portion 62A and the inner periphery connection portion 63A), the filling of the elastomer molding material is performed. Therefore, the fiber density of the connection bands 40, 50 does not vary, and the amount of slackness of the connection bands 40, 50 is defined by the convex portions 64, 65 in the primary molded body 1A. There is no variation.
[0030]
After the molding by the secondary molding die 5, the driving side connector 10 and the driven side connector 20 are alternately fitted to the connecting rings 30, 30,..., Thereby the flexible coupling having the structure shown in FIG. 1
[0031]
In addition, this invention is not limitedly interpreted by embodiment of illustration. For example, the arrangement intervals of the connecting rings 30, 30,... Do not necessarily have to be equally spaced in the circumferential direction 6 as shown, and are determined in accordance with the specifications of the shaft end yoke to be mounted. .
[0032]
【The invention's effect】
According to the method for manufacturing a flexible coupling according to the present invention, after forming a primary molded body covering the connection band, the elastic body is formed into a secondary body in a state in which the connection band is slackened between the connection rings. Since a flexible coupling having a two-stage characteristic is manufactured by molding, a slack is imparted to the connection band between the connection rings adjacent in the circumferential direction. Filling the mold with molding material does not cause variations in the fiber density and slack amount of the connection band, so input torque does not become excessive in some connection bands and flexible with excellent durability. Coupling can be provided. And since the member for giving a slack to a connection belt is unnecessary, the number of parts does not increase and the fall of the durability resulting from the said member can also be prevented.
[Brief description of the drawings]
FIG. 1 is an explanatory view showing a molding process of a primary molded body in a preferred embodiment of a method for producing a flexible coupling according to the present invention.
FIG. 2 is a partial cross-sectional view showing the connecting ring around which the first and second connecting bands are wound in the above manufacturing method, along with the inner peripheral connector, cut along a plane passing through the axis.
FIG. 3 is an external view showing a partial cross section showing a primary molded body obtained by the manufacturing method of the embodiment.
FIG. 4 is an explanatory view showing a molding step of a secondary molded body in the manufacturing method.
FIG. 5 is an external view showing a partial cross section showing a flexible coupling manufactured by the manufacturing method.
FIG. 6 is a characteristic diagram showing a torsion spring characteristic of the flexible coupling.
FIG. 7 is a characteristic diagram showing a torsion spring characteristic of a flexible coupling as a comparative example having a structure in which a connection band is not slack.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Flexible coupling 1A Primary molded object 2,4 Fixed axis | shaft 3 Primary molding die 5 Secondary molding die 10 Drive side connector 20 Drive side connector 30 Connection ring 31 Sleeve 32, 33 Collar 40 First connection band 41, 51 Wire 50 Second connecting band 60 Elastic body 60A Elastic body layer portion 60a Window portion 61, 61A Base portion 62, 62A Outer peripheral connecting portion 63, 63A Inner peripheral connecting portion 64, 65 Protruding portion 101, 201 Base molding space 102, 202 Outer periphery connecting portion forming space 102a, 103a Recess 103, 203 Inner periphery connecting portion forming space

Claims (1)

An even number of connecting rings (30) are arranged at predetermined intervals in the circumferential direction, and the connecting rings (30, 30) adjacent in the circumferential direction are looped around the first and second connecting bands (40, 50) are alternately connected in the circumferential direction, set in the primary molding die (3), and the first and second connection bands (40, 50) covered with the elastic body layer portion (60A). The molded body (1A) was molded, and the first and second connection bands (40, 50) were slackened between the connection rings (30, 30) via the elastic body layer portion (60A). In the state, the primary molded body (1A) is set in a secondary molding die (5), and an elastic body outer layer portion having a required thickness is molded on the outer periphery of the primary molded body (1A). A method for manufacturing a flexible coupling.

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