WO2024076938A1 - Système d'entraînement par courroie - Google Patents

Système d'entraînement par courroie Download PDF

Info

Publication number
WO2024076938A1
WO2024076938A1 PCT/US2023/075760 US2023075760W WO2024076938A1 WO 2024076938 A1 WO2024076938 A1 WO 2024076938A1 US 2023075760 W US2023075760 W US 2023075760W WO 2024076938 A1 WO2024076938 A1 WO 2024076938A1
Authority
WO
WIPO (PCT)
Prior art keywords
belt
sprocket
teeth
drive system
tooth
Prior art date
Application number
PCT/US2023/075760
Other languages
English (en)
Inventor
Sean Colin HACKING
Original Assignee
Hacking Sean Colin
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 Hacking Sean Colin filed Critical Hacking Sean Colin
Publication of WO2024076938A1 publication Critical patent/WO2024076938A1/fr

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/02—Transmissions characterised by use of an endless chain, belt, or the like of unchangeable ratio
    • 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
    • F16H55/00—Elements with teeth or friction surfaces for conveying motion; Worms, pulleys or sheaves for gearing mechanisms
    • F16H55/02—Toothed members; Worms
    • F16H55/17—Toothed wheels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00—Transmissions characterised by use of an endless chain, belt, or the like
    • B62M2009/005—Details of transmission chains specially adapted for bicycles
    • 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
    • F16G—BELTS, CABLES, OR ROPES, PREDOMINANTLY USED FOR DRIVING PURPOSES; CHAINS; FITTINGS PREDOMINANTLY USED THEREFOR
    • F16G1/00—Driving-belts
    • F16G1/06—Driving-belts made of rubber

Definitions

  • This invention pertains to the realm of power transmission systems, particularly a selfaligning belt drive system with teeth having a variable cross-sectional profile across the transverse width, suitable for applications in motor vehicles, bicycles, and a range of other small vehicles, although its utility is not confined to these applications.
  • Chain drives have been extensively utilized in bicycles, motor vehicles, and other analogous applications owing to their capability to effectively transmit power between rotating components.
  • Chains are known for their positive engagement, robustness, and ability to transmit high torques.
  • Some of these limitations include the requirement for regular lubrication, maintenance, cleaning, accompanied by inherent noise generation, poor damping characteristics, substantial mass, and limited drive speed capabilities.
  • belt drives come with their own set of challenges.
  • a prominent issue is the difficulty associated with aligning the belt with the sprockets, which is crucial for efficient power transmission and prolonged operational life.
  • conventional belt drives often struggle to maintain a compact profile while transmitting substantial amounts of power, which becomes a significant concern in space-constrained applications such as bicycles and small motor vehicles.
  • Current designs aimed at ensuring belt and sprocket alignment often employ flanges on the sides of the sprockets.
  • this configuration is known to induce problems such as noise generation due to air venting, trapping of debris between the sprocket and belt, increased manufacturing costs, broader sprocket and drive system width, and an augmented system mass.
  • Some belt drive systems have resorted to utilizing chevron shaped teeth or teeth otherwise offset from each other to maintain belt tracking. While these configurations may smoothen the drive operation to an extent, they significantly compromise belt flexibility and complicate the manufacturing process.
  • the present invention offers a solution to several of the above-described problems by providing self-aligning behavior naturally arising from a belt and sprocket pairing with multiple tooth profile widths.
  • the primary aspect of this invention is a belt having teeth with differing cross-sectional profile across the transverse width of the belt, and a sprocket with complementary cross-sectional profiles across the transverse width of the sprocket teeth extending parallel to the rotation axis that can cooperatively engage with the belt tooth profiles when the belt and sprocket are enmeshed in operation.
  • FIG.1 Is a perspective view of the sprocket cooperatively engaging a flat span of the belt
  • FIG.2 is a perspective view of a section of belt and the belt teeth
  • FIG.3 is a detail perspective view of the belt of FIG.2;
  • FIG.4 is a perspective view of the bicycle drive belt system
  • FIG.5 is a cross section side view of the sprocket cooperatively engaging a flat span of the belt and the sprocket and belt teeth intermeshing;
  • FIG.6 is a detail cross section view of the sprocket and belt of FIG.5 with teeth intermeshing;
  • FIG.7 is a side view of the sprocket cooperatively engaging a flat span of the belt
  • FIG.8 is a detail side view of the sprocket and belt of FIG.7 with teeth intermeshing;
  • FIG.9 is a section view of the sprocket taken along the line FIG.9-FIG.9 of the sprocket of FIG.7;
  • FIG.10 is a detail section view of the sprocket teeth of FIG.7 taken along the line FIG.9-FIG.9 ;
  • FIG.11 is a perspective view of the sprocket teeth
  • FIG.12 is a side view of a bicycle with the belt drive system mounted one the crank and wheel hub;
  • FIG.13 Is a detail perspective view of the sprocket cooperatively engaging a flat span of the belt
  • the belt 1 is comprised of a flat body 3 of flexible material. There are teeth 5, lugs, lobes, or other types of protrusions that extend across the transverse width of the belt 7, on one or more sides of the flat body 3.
  • the flat body 3 may be formed from a flexible and durable body material, such as rubber, plastic or other polymeric material.
  • the belt may be endless, modular, spliced, linear, or otherwise formed into a drive member with a plurality of belt teeth 5.
  • the modular or spliced configurations may utilize a detachable belt utilizing transverse connecting pins placed into transverse cavities within the belt teeth to connect the belt ends formed into an interlocking dado configuration.
  • An embodiment uses cords twisted from carbon fibers as a belt reinforcing material, encased the flat body made from a hard rubber and arranged along the longitudinal dimension 9.
  • the reinforcing material may be also formed from strong fibers like steel, glass fiber, polymer, carbon fibers, or a combination of multiple fibers to increase the load carrying capacity of the belt 1.
  • the transverse belt teeth 5 are formed from the body material extending away from the flat body 3, and are spaced in the longitudinal direction 9 along said belt on at least one side of the flat body, and have a transverse profile or cross-section 11 that is generally normal to the load applied to the belt. This configuration allows said belt to be flexible along a neutral axis between the teeth 5 that allows for bending around a sprocket 13. Most commonly, the teeth 5 are disposed on the inner circumference 15 of the belt 1, but may also be disposed on the outer circumference 17.
  • the belt can be produced by molding, extrusion, machining, grinding, or other manufacturing processes.
  • the belt teeth 5 are formed with more than one cross-section 11, which varies across the transverse width 7 of each tooth.
  • the belt is comprised of multiple cross- sectional profiles 11 that are transversely aligned in order to leave as much flexible area between the belt teeth as possible.
  • the multiple cross-sectional profiles 11 of each belt tooth generally extend the same distance from the flat body 3 of the belt 1, forming a tooth peak 19 that is uninterrupted across the transverse width, although many configurations are possible which confer self-aligning advantages.
  • the transverse belt teeth 5 are formed into a shape that can cooperatively engage with sprocket teeth 21 to transmit force or power to or from the sprocket 13.
  • the transverse belt teeth 5 fit into transverse grooves 23 in between sprocket teeth 21.
  • the sprocket is comprised of a rotatable circular body 25 or frame that supports circumferential teeth 21, protrusions, or lugs, which have a sprocket tooth cross-sectional profile 27 transverse the body and parallel to a rotation axis 29.
  • the rotatable body 25 and teeth 21 rotate about the rotation axis 29.
  • the sprocket body 25 and sprocket teeth 21 can be made from steel, aluminum, plastic, or other durable materials.
  • the sprocket body 25 and sprocket teeth 21 can be made of the same or different materials, formed by stamping, laser cutting, molding, extrusion, forging, waterjet cutting, machining, hobbing, grinding, or other process.
  • the sprocket 13 is formed from steel plates which have the profiles of the sprocket teeth and other features, each stacked and welded together to form the full-width sprocket 13.
  • the sprocket teeth 21 are formed into a shape that can cooperatively engage the belt teeth 5 to transmit force or power to or from the belt when the sprocket comes into proximity to the belt.
  • the sprocket teeth fit into the valleys between the belt teeth 31.
  • the sprocket teeth 21 are formed from more than one cross-sectional profile 27, which varies across the transverse width of the sprocket teeth 21.
  • An embodiment has a small, centralized region 35 which is broader in cross section than the rest of the sprocket tooth.
  • One or more of the sprocket teeth 21 may have a constant cross-section, a cross-section that varies between teeth, or a cross-section that is not completely complementary to the belt tooth 5 shapes, as long as it doesn't interfere with the smooth operation of the system. This can serve different goals in manufacturing, aesthetics, sound, and debris shedding, depending on the application.
  • the different cross-sectional profiles may have a distinct stepwise transition between them, or a curved, chamfered, or otherwise smoothed transition between them.
  • An embodiment utilizes a centralized region which has a broader cross section 35 than the rest of the sprocket tooth, having a transverse width that is less than the transverse width of the complementary narrower portion of the belt tooth 39, providing some clearance between the features on the sprocket and belt, and allowing some small amount of float and misalignment of the sprocket and belt to account for entrapped debris and manufacturing and operational tolerances.
  • the edges of the centralized region 35 have alignment chamfers 41 which aid in the smooth self-alignment of the belt and sprocket.
  • An embodiment features sprocket teeth 21 that extend away from the central sprocket body 25 in a direction parallel to the axis of rotation, serving to lighten the sprocket body 25 and provide an easy path for debris to escape entrapment at the sprocket-belt interface 43.
  • variable sprocket tooth cross-section 27 may be formed from a single part, or created by an elongate member which is formed in the shape of the tooth profile and wrapped around and connected to the sprocket teeth 21.
  • the broader tooth profile 35 is formed from a wire bent into a sprocket profile shape, and inserted into a complementary groove formed in the sprocket teeth 21 so that it is retained while the drive is operating and serves the same function as a sprocket produced from a single piece of material.
  • the variable sprocket tooth cross-section may also be formed with plates of material stacked and welded together, as mentioned previously.
  • a groove 45 that slopes away from the sprocket centerline and toward the axis of rotation may be formed in between the sprocket teeth 21 to encourage the shedding of debris trapped between the belt teeth 5 and sprocket teeth 21.
  • This groove may have various shapes and configurations that create an open path towards the axis of rotation 29 for debris to be shed away from the belt-sprocket interface 43.
  • the sprocket 13 and the belt 1 cooperatively engage in a way the belt 1 wraps around the sprocket 13, or the sprocket 13 rolls against a flat span of belt 1, and force or power can be transmitted between the belt 1 and one or more sprockets 13.
  • the sprocket 13 is either rotated by the belt 1 in the driven configuration or rotates to drive the belt in the driving configuration.
  • belt drive system is implemented as a bicycle 50 drive system 51 for transmitting motive force from the rider or motor to the drive wheel 55.
  • a drive sprocket 47 is rotatably mounted to the central pedal crank 53, and a driven sprocket 49 is mounted to rear wheel hub 57, with the belt 1 spanning between them.
  • It may be incorporated in pedal assist bicycles, in electric bicycles and scooters, in electric motorcycles, and in numerous other wheeled vehicles.
  • the inventive drive system may be embodied in any system comprising drive and driven sprockets in which reliably transmitting power between a drive sprockets 47 and driven sprocket 49 confers one or more mechanical advantage on the system.
  • the tooth cross-section 11 near the center of the belt is narrower than the edges of the belt, and this engages cooperatively with a broader cross section near the center of the sprocket tooth 35 to provide self-aligning of the belt 1 on the sprocket 13.
  • the belt drive system is self-aligning because the broader tooth region of the sprocket 35 cannot engage with the broader tooth region of the belt 59, as they are not complementary profiles.
  • the broad cross sections 35 of the sprocket teeth may only fit with the narrow cross section 39 of the belt teeth, and the narrow cross sections of the sprocket teeth 37 may only fit with the broad cross sections 59 of the belt teeth.
  • This self-aligning is advantageous for the construction of more compact belt drive systems but does not compromise tooth integrity or power rating to a high degree since the belt teeth 5 are substantially intact across the belt transverse width 7.
  • the muti-profile configuration described herein is compact, easy to manufacture with traditional techniques, reduces noise from engagement and air venting, reduces system vibration, and operates smoothly in low- wrap -angle applications due to the different tooth profiles engaging at slightly different times during operation.
  • the belt drive system disclosed herein can have application to a wide variety of apparatus utilizing belt drives, including, but not limited to, cycles such as motorcycles and bicycles. Any embodiment is intended to be non-limiting unless expressly limited by the scope of the attached claims.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Gears, Cams (AREA)

Abstract

L'invention concerne un système d'entraînement à roue dentée et courroie qui comprend une courroie et une ou plusieurs roues dentées rotatives, la roue dentée et la courroie ayant toutes deux des dents qui s'engrènent les unes avec les autres. Les dents présentent de multiples profils de section transversale sur la largeur transversale. La section transversale de dent de courroie est plus étroite dans la région centrale par rapport aux régions de bord, tandis que les sections transversales de dents de roue dentée sont plus larges dans la région centrale. Cet agencement permet une mise en prise coopérative entre les dents de courroie et les dents de roue dentée, facilitant le transfert de mouvement et l'auto-alignement de la courroie et des roues dentées le long de l'axe de rotation.
PCT/US2023/075760 2022-10-02 2023-10-02 Système d'entraînement par courroie WO2024076938A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US202263412478P 2022-10-02 2022-10-02
US63/412,478 2022-10-02

Publications (1)

Publication Number Publication Date
WO2024076938A1 true WO2024076938A1 (fr) 2024-04-11

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ID=90609000

Family Applications (1)

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PCT/US2023/075760 WO2024076938A1 (fr) 2022-10-02 2023-10-02 Système d'entraînement par courroie

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Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571224A (en) * 1982-07-27 1986-02-18 Unitta Co., Ltd. Belt drive system
US6419603B1 (en) * 1997-04-15 2002-07-16 Andreas Grasl Device for transmitting a force, in particular a compression force, along a substantially straight path
US20060264286A1 (en) * 2005-05-20 2006-11-23 Yahya Hodjat Sprocket
US20080190462A1 (en) * 2007-02-08 2008-08-14 Habasit Ag Sprocket For Easy Cleaning
US20110049831A1 (en) * 2009-09-01 2011-03-03 Lumpkin Wayne R Belt Drive System
US20130139642A1 (en) * 2011-12-06 2013-06-06 Sram, Llc Chainring
US20180003273A1 (en) * 2016-07-01 2018-01-04 Gates Corporation Belt Drive System
US20200173522A1 (en) * 2018-11-30 2020-06-04 Gregory A. Godsey Helical belt assembly, method of use, and kit therefore

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4571224A (en) * 1982-07-27 1986-02-18 Unitta Co., Ltd. Belt drive system
US6419603B1 (en) * 1997-04-15 2002-07-16 Andreas Grasl Device for transmitting a force, in particular a compression force, along a substantially straight path
US20060264286A1 (en) * 2005-05-20 2006-11-23 Yahya Hodjat Sprocket
US20080190462A1 (en) * 2007-02-08 2008-08-14 Habasit Ag Sprocket For Easy Cleaning
US20110049831A1 (en) * 2009-09-01 2011-03-03 Lumpkin Wayne R Belt Drive System
US20130139642A1 (en) * 2011-12-06 2013-06-06 Sram, Llc Chainring
US20180003273A1 (en) * 2016-07-01 2018-01-04 Gates Corporation Belt Drive System
US20200173522A1 (en) * 2018-11-30 2020-06-04 Gregory A. Godsey Helical belt assembly, method of use, and kit therefore

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