TOOTHED BELT DRIVING DEVICE FOR BICYCLE

PROBLEM TO BE SOLVED: To provide a toothed belt diving device for bicycle which can suppress a noise from a drive pulley and maintain a smooth engagement of pulley groove parts of the drive pulley and belt teeth even under an environment where a foreign substance may attach to the toothed belt and t...

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Bibliographic Details
Main Author OSAKI YUTAKA
Format Patent
LanguageEnglish
Japanese
Published 09.03.2017
Subjects
BLASTING
CYCLES
ENGINEERING ELEMENTS AND UNITS
GEARING
GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS
HEATING
LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
LIGHTING
MECHANICAL ENGINEERING
PERFORMING OPERATIONS
POWERED PROPULSION OF SLEDGES OR
RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES
THERMAL INSULATION IN GENERAL
TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
TRANSPORTING
WEAPONS
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Summary:PROBLEM TO BE SOLVED: To provide a toothed belt diving device for bicycle which can suppress a noise from a drive pulley and maintain a smooth engagement of pulley groove parts of the drive pulley and belt teeth even under an environment where a foreign substance may attach to the toothed belt and the drive pulley.SOLUTION: A toothed belt 4 includes a plurality of belt teeth 10 having both sides in a longitudinal direction of the belt being flat or outwardly curved. Pulley groove parts 20 formed on an outer circumference of a drive pulley 2 and engaging with the belt teeth 10 have facing surfaces thereof being outwardly curved, the pulley groove parts 20 consisting of two pins 23 having a gap therebetween to which the belt teeth 10 engage with and a part of a groove bottom 30a surrounding a rotational center Cr of the drive pulley 2 and that is not in contact with the belt teeth 10. A circle that passes a position farthest from the rotational center Cr of the two pins 23 and at least a part of a space from the groove bottom 30a is opened at least in one direction in a direction of the rotational center Cr.SELECTED DRAWING: Figure 4 【課題】歯付ベルトと駆動プーリに異物が付着する環境下にあっても、駆動プーリにおける異音を抑制できると共に、駆動プーリのプーリ溝部とベルト歯部との円滑な噛み合いを維持できる自転車用歯付ベルト駆動装置を提供する。【解決手段】歯付ベルト４は、ベルト長手方向の両側面が平坦状または外側に膨らんだ湾曲状に形成された複数のベルト歯部１０を有する。駆動プーリ２の外周部に形成されてベルト歯部１０と噛み合うプーリ溝部２０は、互いに対向する面が外側に膨らんだ湾曲状に形成されており、その隙間にベルト歯部１０が係合される２つのピン部２３と、駆動プーリ２の回転中心Ｃｒを取り囲むように配置されて、ベルト歯部１０と接触しない溝底面３０ａの一部とによって形成される。２つのピン部２３のＣｒから最も離れた位置を通る円周と、溝底面３０ａとの間の空間の少なくとも一部は、Ｃｒ方向の少なくとも一方向に開放されている。【選択図】図４
Bibliography:Application Number: JP20160167571