JPH0733009Y2 - Toothed belt pulley - Google Patents

Toothed belt pulley

Info

Publication number
JPH0733009Y2
JPH0733009Y2 JP7952988U JP7952988U JPH0733009Y2 JP H0733009 Y2 JPH0733009 Y2 JP H0733009Y2 JP 7952988 U JP7952988 U JP 7952988U JP 7952988 U JP7952988 U JP 7952988U JP H0733009 Y2 JPH0733009 Y2 JP H0733009Y2
Authority
JP
Japan
Prior art keywords
pulley
belt
tooth
teeth
toothed belt
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 - Lifetime
Application number
JP7952988U
Other languages
Japanese (ja)
Other versions
JPH022562U (en
Inventor
勇 永井
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Motors Corp
Original Assignee
Mitsubishi Motors Corp
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Motors Corp filed Critical Mitsubishi Motors Corp
Priority to JP7952988U priority Critical patent/JPH0733009Y2/en
Publication of JPH022562U publication Critical patent/JPH022562U/ja
Application granted granted Critical
Publication of JPH0733009Y2 publication Critical patent/JPH0733009Y2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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
    • F16H—GEARING
    • F16H7/00—Gearings for conveying rotary motion by endless flexible members
    • F16H7/02—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts
    • F16H7/023—Gearings for conveying rotary motion by endless flexible members with belts; with V-belts with belts having a toothed contact surface or regularly spaced bosses or hollows for slipless or nearly slipless meshing with complementary profiled contact surface of a pulley

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Pulleys (AREA)

Description

【考案の詳細な説明】 〈産業上の利用分野〉 本考案は、例えば自動車のエンジンの動力を伝達するた
めに使用される歯付きベルトに噛み合うプーリに関す
る。DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention relates to a pulley that meshes with a toothed belt used for transmitting the power of an engine of an automobile, for example.

〈従来の技術〉 エンジンルーム内に設けられ、例えばエンジンのクラン
ク軸とカム軸を連動させる伝動装置は歯付ベルトとして
のタイミングベルトとこのタイミングベルトと噛み合う
少なくとも２つのプーリとからなっている。第４図にこ
の伝動装置の斜視概略図、第５図にプーリの断面図、第
６図にタイミングベルトと各プーリとの噛み合い状態説
明図を示す。第４図に示すように、タイミングベルト１
はクランク軸とカム軸との距離が離れているためにクラ
ンク軸に固定されたクランクプーリ２とカム軸に固定さ
れたカムプーリ３とを連結するように設けられており、
それらの間にはタイミングベルト１に一定の張りを保た
せるためにテンショナ４が設けられている。<Prior Art> A transmission device provided in an engine room, for example, for interlocking a crank shaft and a cam shaft of an engine, includes a timing belt as a toothed belt and at least two pulleys meshing with the timing belt. FIG. 4 shows a schematic perspective view of this transmission device, FIG. 5 shows a sectional view of the pulley, and FIG. 6 shows a meshing state explanatory diagram of the timing belt and each pulley. As shown in FIG. 4, the timing belt 1
Is provided so as to connect the crank pulley 2 fixed to the crank shaft and the cam pulley 3 fixed to the cam shaft because the distance between the crank shaft and the cam shaft is large.
A tensioner 4 is provided between them to keep the timing belt 1 tensioned.

これらのプーリ2,3は金属あるいは樹脂などの硬い材質
からなり、第４図に示すように、軸方向一端の外径d1に
対して他端の外径d2の方が若干大きくなるようテーパ状
をなしている。そして、外周部には周方向等間隔に複数
の歯５が並設されると共に小径部側には全周に渡ってベ
ルト１の片寄りを防止するフランジ６が形成されてい
る。また、中心部には図示しない回転軸が貫通して係止
される孔７が形成されたボス部８が設けられている。These pulleys 2 and 3 are made of a hard material such as metal or resin. As shown in FIG. 4, the outer diameter d 2 at the other end is slightly larger than the outer diameter d 1 at the one end in the axial direction. It has a tapered shape. A plurality of teeth 5 are arranged in parallel on the outer peripheral portion at equal intervals in the circumferential direction, and a flange 6 is formed on the small diameter portion side to prevent the belt 1 from being offset over the entire circumference. Further, a boss portion 8 having a hole 7 through which a rotary shaft (not shown) penetrates and is locked is provided in the central portion.

一方、タイミングベルト１は、第５図に示すように、一
般的に、クロロプレンなどの合成ゴム層９の中にガラス
繊維からなる芯線10が複数挿入されると共にその内側に
成型された等間隔の突部の表面をナイロンなどの帆布11
が被覆して複数の歯12が形成されて成っている。On the other hand, as shown in FIG. 5, the timing belt 1 generally has a plurality of core wires 10 made of glass fibers inserted in a synthetic rubber layer 9 such as chloroprene and molded at equal intervals. The surface of the protrusion is a canvas such as nylon 11
Are covered to form a plurality of teeth 12.

このように構成された伝動装置はクランクプーリ２が回
転することによりタイミングベルト１を介してカムプー
リ３が回転して動力を伝達している。また、プーリ2,3
がベルト１に噛み合うときに、プーリ2,3の歯５はプー
リ2,3の軸方向の一端の大径部分の歯先部5aから他端の
小径部の歯先部5bへと順にベルト１の歯12に接触して徐
々に噛み合っていくこととなるので、このときのベルト
１とプーリ2,3との衝撃音は緩和されると共に、プーリ
2,3の噛み合い時のベルト１の張力がベルト１の幅方向
の各位置で異なるため、このベルト１の振動を互いに打
ち消すこととなり異音の発生が防止されることとなる。In the transmission configured as described above, the cam pulley 3 is rotated via the timing belt 1 by the rotation of the crank pulley 2 to transmit power. Also, pulleys 2, 3
When the belt meshes with the belt 1, the teeth 5 of the pulleys 2 and 3 are sequentially arranged from the tooth tip portion 5a of the large diameter portion at one end in the axial direction of the pulleys 2 and 3 to the tooth tip portion 5b of the small diameter portion at the other end. Since it comes into contact with the teeth 12 of the pulley and gradually meshes with each other, the impact noise between the belt 1 and the pulleys 2 and 3 at this time is reduced and
Since the tension of the belt 1 at the time of meshing of 2 and 3 is different at each position in the width direction of the belt 1, the vibrations of the belt 1 are canceled each other and the generation of abnormal noise is prevented.

〈考案が解決しようとする課題〉 このような従来の伝動装置において、タイミングベルト
１の歯元部13の帆布11は傷み易く、タイミングベルト１
を長期間使用していると、このタイミングベルト１の歯
元部13に次第に割れが生じてタイミングベルトの歯12が
欠けてしまったり、あるいはこの割れがベルトゴム層９
に派生してタイミングベルト１が破断されるという問題
を生じる。このタイミングベルト１の歯元部13の割れ
は、ベルト駆動時に各プーリ2,3の歯５の頂面14と側面1
5とが交わる角部16がタイミングベルト１の歯元部13に
当接することで歯元部13に繰返して衝撃を与えることに
より発生するものである。特に、上述したようなテーパ
状のプーリ2,3においては、プーリ2,3の大径部側が接触
するベルト１の歯元部13に小径部側に比べてより大きな
荷重が作用することとなり、大径部側が係合する部分か
ら割れが発生する可能性が高い。<Problems to be Solved by the Invention> In such a conventional transmission device, the canvas 11 of the tooth root portion 13 of the timing belt 1 is easily damaged and the timing belt 1
Is used for a long time, the tooth root portion 13 of the timing belt 1 is gradually cracked and the tooth 12 of the timing belt is chipped, or this crack is caused by the belt rubber layer 9
As a result, the problem that the timing belt 1 is broken occurs. The cracking of the tooth root portion 13 of the timing belt 1 is caused by the top surface 14 and the side surface 1 of the tooth 5 of each pulley 2, 3 when the belt is driven.
It is generated by repeatedly applying impact to the tooth root portion 13 by contacting the tooth root portion 13 of the timing belt 1 with the corner portion 16 where 5 intersects. In particular, in the tapered pulleys 2 and 3 as described above, a larger load is applied to the tooth root portion 13 of the belt 1 with which the large diameter side of the pulleys 2 and 3 comes into contact, as compared with the small diameter side, There is a high possibility that cracks will occur from the part where the large diameter part side engages.

本考案はこのような問題点を解決するものであり、テー
パ状のプーリにおける大径部側の角部が接触する歯付き
ベルトの歯元部での荷重を緩和することによりベルトの
割れを防止して耐久性を向上させることのできる歯付き
ベルト用プーリを提供することを目的とする。The present invention solves such a problem, and prevents the belt from cracking by reducing the load at the root portion of the toothed belt with which the large-diameter side corner portion of the tapered pulley contacts. It is an object of the present invention to provide a pulley for a toothed belt that can improve durability.

〈課題を解決するための手段〉 上述の目的を達成するための本考案の歯付きベルト用プ
ーリは、動力を伝達する歯付きベルトと噛み合う複数の
歯が外周部に周方向に沿って一定間隔で設けられると共
に外径が軸方向一端に対して他端が大きく形成されたテ
ーパ状をなす歯付きベルト用プーリにおいて、前記歯の
頂面と側面とが交わる角部の形状が前記プーリの小径部
側に対して大径部側がなだらかに形成されていることを
特徴とするものである。<Means for Solving the Problems> In the toothed belt pulley of the present invention for achieving the above-mentioned object, a plurality of teeth meshing with a toothed belt for transmitting power are circumferentially arranged at regular intervals along the outer peripheral portion. In the tapered pulley for a toothed belt, the outer diameter of which is large with respect to one end in the axial direction, and the shape of the corner portion where the top surface and the side surface of the tooth intersect is a small diameter of the pulley. It is characterized in that the large diameter portion side is formed gently with respect to the portion side.

〈作用〉 プーリの歯の角部の形状が小径部側に対して大径部側が
なだらかに形成されているので、その大径部側の角部が
接触するベルトの歯の歯元部への荷重が緩和される。<Function> Since the shape of the corners of the teeth of the pulley is formed so that the large-diameter side is gentle with respect to the small-diameter side, the corners of the large-diameter side contact the root of the tooth of the belt. The load is relieved.

〈実施例〉 以下図面に基づいて本考案の一実施例を詳細に説明す
る。<Embodiment> An embodiment of the present invention will be described in detail with reference to the drawings.

第１図及び第２図は本考案の一実施例に係る歯付きベル
ト用プーリを示すものであって、第１図はプーリの歯の
一部切欠き斜視図、第２図はプーリの歯の正面図であ
る。なお、従来と同一部材には同一の符号を付して重複
する説明は省略する。1 and 2 show a pulley for a toothed belt according to an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of the teeth of the pulley, and FIG. 2 is a tooth of the pulley. FIG. It should be noted that the same members as those of the related art are denoted by the same reference numerals, and duplicate description will be omitted.

本考案のプーリ20は外周部に並設された複数の歯の形状
のみ異なるだけでその他の構成は従来のものと同様であ
るため、従来と同じ部分についての詳細な説明は省略す
る。The pulley 20 of the present invention is the same as the conventional one except for the shapes of a plurality of teeth arranged side by side on the outer peripheral portion, and thus detailed description of the same parts as the conventional one will be omitted.

プーリ20は、第１図に示すように、従来と同様に外周部
に周方向に沿って一定の間隔で複数の歯23が並設されて
おり、これらの歯23は軸方向一端のプーリ小径部21側の
外径d1に対して他端のプーリ大径部22側の外径d2の方が
若干大きくなるようテーパ状に形成されている。As shown in FIG. 1, the pulley 20 has a plurality of teeth 23 arranged in parallel on the outer peripheral portion at regular intervals in the same manner as in the conventional case, and these teeth 23 have a small pulley diameter at one end in the axial direction. The outer diameter d 2 on the pulley large-diameter portion 22 side at the other end is formed to be slightly larger than the outer diameter d 1 on the portion 21 side.

このプーリ20の歯23は、第１図及び第２図に示すよう
に、断面形状が台形をなし、歯23の頂面24と側面25とが
交わる角部26は円弧状に形成されている。本実施例で
は、この角部26の円弧の半径をプーリ20の小径部21側の
円弧半径R1に対して大径部22側の円弧半径R2を大きく設
定すると共に両者を滑らかに連続させることで、プーリ
20の歯21の角部26はプーリ20の小径部21側から大径部22
側にかけてその湾曲がだんだんとなだらかになるように
形成されている。この角部26の円弧半径は、例えば歯た
けが2.6mmのものに対してR1＝R0.75,R2＝R1.5として設
定される。As shown in FIGS. 1 and 2, the teeth 23 of the pulley 20 have a trapezoidal cross-sectional shape, and a corner portion 26 where the top surface 24 and the side surface 25 of the teeth 23 intersect is formed in an arc shape. . In this embodiment, the smoothly continuous both sets the arc radius R 2 of the large diameter portion 22 side increases relative to the circular arc radius R 1 of the small diameter portion 21 side of the radius of the arc of the corner portion 26 a pulley 20 By the pulley
The corner portion 26 of the tooth 21 of the 20 is from the small diameter portion 21 side of the pulley 20 to the large diameter portion 22.
It is formed so that the curve gradually becomes gentler toward the side. The radius of the arc of the corner portion 26 is set as R 1 = R0.75, R 2 = R1.5 for a tooth having a tooth depth of 2.6 mm, for example.

このように構成されたプーリ20が歯付きベルト１と噛み
合うとき、プーリ20の歯23はプーリ小径部21側に対して
大径部22側の角部26がなだらかに形成されているので、
大径部22側の角部26が接触するベルト１の歯元部13への
荷重が緩和される。また、ベルト１にかかる荷重はその
ベルト１の幅方向に分散されて歯元部13のある一定箇所
に応力が集中することなく、ベルト１の歯元部13での割
れを防止できる。When the pulley 20 configured in this way meshes with the toothed belt 1, the teeth 23 of the pulley 20 have the corners 26 on the large diameter portion 22 side gently formed with respect to the pulley small diameter portion 21 side.
The load on the root portion 13 of the belt 1 with which the corner portion 26 on the large diameter portion 22 side comes into contact is relaxed. Further, the load applied to the belt 1 is dispersed in the width direction of the belt 1 so that the stress is not concentrated on a certain portion of the tooth root portion 13, and cracks at the tooth root portion 13 of the belt 1 can be prevented.

なお、本実施例ではプーリ20の歯23の角部26の形状を大
径部22側の角部の円弧半径を小径部21側に対して大きく
することでプーリ20とベルトとの噛み合い時に大径部22
側がベルト１の歯元部13に与える衝撃を緩和させたが、
本考案はこの実施例に限定されるものではなく、例え
ば、第３図に示すように、プーリ20の歯23の側面25及び
角部26の大径部22側を削り落して形成してもよく、即
ち、プーリ20の歯23の角部26の形状をプーリ20の小径部
21側に対して大径部22側をなだらかに形成すれば本考案
の目的は達成できるものである。In this embodiment, the shape of the corner portion 26 of the tooth 23 of the pulley 20 is made large when the pulley 20 and the belt are meshed by increasing the arc radius of the corner portion on the large diameter portion 22 side with respect to the small diameter portion 21 side. Diameter 22
The side alleviated the impact on the root portion 13 of the belt 1,
The present invention is not limited to this embodiment. For example, as shown in FIG. 3, the side surface 25 of the tooth 23 of the pulley 20 and the large diameter portion 22 side of the corner portion 26 may be formed by cutting off. Well, that is, the shape of the corner portion 26 of the tooth 23 of the pulley 20 is changed to the small diameter portion of the pulley 20.
The object of the present invention can be achieved by gently forming the large diameter portion 22 side with respect to the 21 side.

〈考案の効果〉 以上一実施例を挙げて詳細に説明したように本考案の歯
付きベルト用プーリによれば、テーパ状をなすプーリの
外周部に並設された複数の歯の角部の形状をプーリの小
径部側に対して大径部側をなだらかに形成したので、プ
ーリがベルトに噛み合うとき、プーリの大径部側の歯の
角部が接触するベルトの歯元部への荷重が緩和されてベ
ルトの割れを防止することができ、ベルトの耐久性を向
上させることができる。<Effects of the Invention> As described in detail with reference to the above embodiment, according to the toothed belt pulley of the present invention, the corner portions of a plurality of teeth juxtaposed on the outer periphery of the tapered pulley are formed. Since the large-diameter side is formed gently with respect to the small-diameter side of the pulley, when the pulley meshes with the belt, the corners of the teeth on the large-diameter side of the pulley contact the load on the root of the belt. Can be mitigated to prevent the belt from cracking, and the durability of the belt can be improved.

【図面の簡単な説明】[Brief description of drawings]

第１図及び第２図は本考案の一実施例に係る歯付きベル
ト用プーリを示すものであって、第１図はプーリの歯の
一部切欠き斜視図、第２図はプーリの歯の正面図、第３
図は本考案の他の実施例に係るプーリの歯の一部切欠き
斜視図、第４図は一般的な伝動装置の斜視概略図、第５
図及び第６図は従来の歯付きベルト用プーリを示すもの
であって、第５図はプーリの断面図、第６図はベルトと
プーリとの噛み合い状態説明図である。 図面中、１は歯付きベルト、12は歯、13は歯元部、20は
プーリ、21は小径部、22は大径部、23は歯、24は頂面、
25は側面、26は角部である。1 and 2 show a pulley for a toothed belt according to an embodiment of the present invention. FIG. 1 is a partially cutaway perspective view of the teeth of the pulley, and FIG. 2 is a tooth of the pulley. Front view of the third
FIG. 4 is a partially cutaway perspective view of a pulley tooth according to another embodiment of the present invention, FIG. 4 is a perspective schematic view of a general transmission device, and FIG.
FIG. 6 and FIG. 6 show a conventional toothed belt pulley. FIG. 5 is a sectional view of the pulley and FIG. 6 is an explanatory view of a meshing state between the belt and the pulley. In the drawing, 1 is a toothed belt, 12 is a tooth, 13 is a root portion, 20 is a pulley, 21 is a small diameter portion, 22 is a large diameter portion, 23 is a tooth, 24 is a top surface,
25 is a side surface and 26 is a corner portion.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 【請求項１】動力を伝達する歯付きベルトと噛み合う複
数の歯が外周部に周方向に沿って一定間隔で設けられる
と共に外径が軸方向一端に対して他端が大きく形成され
たテーパ状をなす歯付きベルト用プーリにおいて、 前記歯の頂面と側面とが交わる角部の形状が前記プーリ
の小径部側に対して大径部側がなだらかに形成されてい
ることを特徴とする歯付きベルト用プーリ。1. A taper shape in which a plurality of teeth that mesh with a toothed belt for transmitting power are provided on an outer peripheral portion at regular intervals along the circumferential direction, and the outer diameter is formed such that one end in the axial direction is larger than the other end. In the pulley for toothed belts, the shape of the corner where the top surface and the side surface of the tooth intersect is formed such that the large diameter portion side is gently formed with respect to the small diameter portion side of the pulley. Belt pulley.
JP7952988U 1988-06-17 1988-06-17 Toothed belt pulley Expired - Lifetime JPH0733009Y2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7952988U JPH0733009Y2 (en) 1988-06-17 1988-06-17 Toothed belt pulley

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7952988U JPH0733009Y2 (en) 1988-06-17 1988-06-17 Toothed belt pulley

Publications (2)

Publication Number Publication Date
JPH022562U JPH022562U (en) 1990-01-09
JPH0733009Y2 true JPH0733009Y2 (en) 1995-07-31

Family

ID=31304403

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7952988U Expired - Lifetime JPH0733009Y2 (en) 1988-06-17 1988-06-17 Toothed belt pulley

Country Status (1)

Country Link
JP (1) JPH0733009Y2 (en)

Also Published As

Publication number Publication date
JPH022562U (en) 1990-01-09

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