WO2014158120A1 - Stepped mechanical transmission - Google Patents
Stepped mechanical transmission Download PDFInfo
- Publication number
- WO2014158120A1 WO2014158120A1 PCT/UA2013/000040 UA2013000040W WO2014158120A1 WO 2014158120 A1 WO2014158120 A1 WO 2014158120A1 UA 2013000040 W UA2013000040 W UA 2013000040W WO 2014158120 A1 WO2014158120 A1 WO 2014158120A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- spindle
- output
- option
- stepped
- transition
- Prior art date
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Classifications
-
- 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
- B62M1/00—Rider propulsion of wheeled vehicles
- B62M1/10—Rider propulsion of wheeled vehicles involving devices which enable the mechanical storing and releasing of energy occasionally, e.g. arrangement of flywheels
- B62M1/105—Rider propulsion of wheeled vehicles involving devices which enable the mechanical storing and releasing of energy occasionally, e.g. arrangement of flywheels using elastic elements
-
- 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
- B62M9/04—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
Definitions
- the invention applied for is of a type of transmission meant to set into motion pedal driven vehicles, namely a transmission as distinguished by cog drive in use.
- Shortcomings for the transmission in question are as follows: a) critical density of the interacting high-precision assembly components running under considerable dynamic load and inside a limited space of the wheel hub, which requires extra expenditures for costly construction materials and complex processing technologies to be applied; b) limited space and hermetic body of the transmission prevent the heat release, in particular at braking, hence restrict the intensity of the transmission loading; c) the transmission complexity requires special equipment for its mounting and does not allow for any maintenance or repair service outside the workshops equipped for the purpose.
- a key task for the invention is to develop a design of stepped mechanical transmission, which would enable, by way of introducing an alternate embodiment for the type of constant gearing mechanical transmission between the spindles, as well as for the output spindle and/or for one of the star gears of the chain driving, the use of a lightweight gear reductor of external cogwheels gearing and/or the use of a chain and/or cog belt drive of constant gearing between the spindles, thus improving the weight and dimension characteristics of the transmission, reducing its production costs without prejudice to its life span, the ease of manufacturing and repairability.
- the set task is fulfilled with the pedal drive vehicle stepped mechanical transmission design that contains a body that provides for the option of its mounting to a vehicle, tubular output spindle that provides for the option of connecting it to the device for a rotary moment transmission into driving spindle of a vehicle; input spindle that provides for the option of connecting it to the vehicle crankset, the driving spindle being mounted along the same axel within the housing of tubular output spindle, while its axis of rotation is parallel to that of the output spindle; stepped reductor containing transition spindle mounted in parallel to the driving and output spindles, reductor being designed to contain at least three modules of external gearing cogwheel pairs of required velocity ratio value; among these the cogwheels of one side are rigidly mounted to, respectively, the input and transition spindles, while one cogwheel of each cogwheels pair of other modules is mounted rigidly to output spindle, with another cogwheel of each cogwheels pair spinning freely around the transition spindle providing for the option of its rigid mounting
- Prevailing embodiment of the invention features a gear shifting device made of driven splined sliding bushings with forked carriers, where each cogwheel (star gear) engaging the bushing has a relevant device to gear respective bushing.
- the blocker may be designed as an assembly of a pusher, both ends tapered, installed within the housing of a hollow transition spindle and capable of moving along the axel of the transition spindle in both directions. Both of the tapered ends of the pusher interact with radially mounted into holes resilient pins capable of radial movements across the center of the transition spindle.
- the pin under the cogwheel or the star gear that freely spins around transition spindle moving radially is capable, with its outer end, to emerge outside the transition spindle and gear the cave at the inner surface of cogwheel register diameter.
- the blocker functions in the following way.
- the hold-down device triggered with the shifting mechanism located at the pedal vehicle control unit presses the pin outside the cogwheel, which, moving inside the transition spindle, presses outer tapered end of the pusher. Moving toward the cogwheel the pusher with its tapered end forces out the pin from under the cogwheel.
- the damper of rotary vibration reduces the load onto the contact dot between the cogwheel teeth, thus enabling to narrow its area proportionally reducing, eventually, dimensions and weight of the cogwheels in the gear drive.
- Figure 1 provides a gearing diagram for the bicycle stepped mechanical transmission as a case example for the applied for transmission embodiment.
- Bicycle mechanical stepped transmission is integrated into the lower part of a bicycle frame.
- it contains a body 1 integrated into the lower part of the frame, at the body there are an input spindle 2 that also serves as a spindle for bicycle crankset and an output spindle 3 that provides for the option of connecting it to the device of a rotary moment transmission onto the driving spindle of the bicycle via mounted on it driving gear (chain ring) 4 of the bicycle chain system 5.
- Output spindle 3 has a tube structure, and an input spindle 2 is axially aligned against it in its housing.
- One side of the transmission driving spindle 2 leans with a bearing against the body 1, another side leans with a bearing against the inside diameter of the output tubular spindle 3.
- transition spindle 6 mounted that leans with the bearings of its both sides against the body 1 and is installed in parallel to the output and input spindles.
- modules of chain and/or cog belt drives (7 - 16 ) assembled into a reductor mounted at 2, 3, 6 spindles.
- Those modules of chain and/or cog belt drives have a velocity ratio of a required value, which ensures the star gears of chain and/or cog belt drives 7, 8 from one side are rigidly mounted to, respectively, input and transition spindles and are constantly interlinked with gears.
- the transmission includes gear shifting device mounted to the body 1 as a set of driven splined sliding bushings 17 with round spire through which forked carriers 18 run, which have a given angle of movement around their axel, attached to the other side of it there are balancing levers triggered by flexible cables from the gear selection conductor 19 mounted to the bicycle handlebar - it is omitted for clarity (in the drawing).
- the bushings are tightly linked with the splines to the transition spindle 6 following the hand of rotation and are capable of moving along those splines until running into gear with one of the four cogwheels 10, 12, 14, 16, which have relevant spline holes that provide for the option for rigid mounting of cogwheels 10, 12, 14, 16 to the transition spindle.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
Abstract
Herewith a stepped mechanical transmission for a pedal driven vehicle is applied for. It consists of a body that provides for the option of its mounting to a vehicle, tubular output spindle that provides for the option of connecting it to the device of a rotary moment transmission onto the vehicle driving spindle, input spindle that provides for the option of connecting it to the vehicle crankset, input spindle being installed along the axis of the tubular output spindle inside its housing, its rotation axis parallel to that of the output spindle, a stepped reductor that contains a transition spindle parallel to the input and output spindles, the reductor being designed to contain at least three modules of cog wheel pairs, among these the cogwheels of one side are rigidly mounted to, respectively, the input and transition spindles, while one cogwheel of each cogwheels pair of other modules is mounted rigidly to output spindle, with another cogwheel of each cogwheels pair spinning freely around the transition spindle providing for the option of its rigid mounting to this spindle with a gear shifting device, and the gear shifting device; its constant gearing between the spindles is provided with chain and/or cog belt drive, while there is a damper of rotary vibration made of springs or spring materials mounted into output spindle or one of the chain drive star gears.
Description
Stepped Mechanical Transmission
Field of the invention
The invention applied for is of a type of transmission meant to set into motion pedal driven vehicles, namely a transmission as distinguished by cog drive in use.
Background of the invention
There is a common knowledge bicycle mechanical stepped transmission invented by Tullio Campagnolo (http://en.wikipedia.org/wiki/Bicycle_chain) that consists of star gears of gradually increasing diameter assembled into a single cassette mounted on common axle. A cyclist sets front cassette of driving gears (chain rings) into rotation with crankset. The rotation motion is transmitted with bicycle chain to the rear cassette from the front set of driving star gears (chain rings). Velocity ratio and transmission are selected by changing the pair of driving-driven gears of various diameter resulting from prior side movement of bicycle chain. The said side movement of bicycle chain is performed by specific guide mechanism (derailleur) controlled with flexible cables by a cyclist. To ensure even tension of the chain during the interaction of two star gears differing in diameter there is a spring adjuster installed at the rear derailleur.
Shortcomings for the transmission in question are as follows: a) lack of protection from adverse impacts resulting in friction particles of dust settling on the interacting mechanical units, thus causing their considerably accelerated abrasive wear; this requires extra costs for cleanup and maintenance; b) due to relatively greater width of the rear cassette (of sprockets) the guide of derailleur and the device for adjusting chain with the spring are located in the site of increased risk of mechanical damages induced by stumbling upon, and bumping into, external objects, that would increase the number of
unscheduled repairs that imply relevant time and cost expenditures; d) as the interaction of the opposite against the axle of motion rear and front star gears begins the chain runs at a considerable angle that significantly accelerates its wearing and increases the transmission mechanical losses thus resulting in its early dysfunction and extra expenditure for its replacement e) design based failure of the above transmission system to transmit a rotary moment backward disables the mode of stopping bicycle with a crankset; e) in order to complete gear changing the star gear selected needs to rotate several times free of a tension so that the chain shifting into new trace would complete, which requires the cyclists to develop specific psychomotor skills; f) the star gear assemblies need to be space-effective, ensure the chain flexibility, move the chain sidewise along the cassette of star gears requiring little effort, which disable the transmission of such type to be used in cargo bicycles or in the bicycles for obese persons.
There is a common knowledge bicycle mechanical stepped transmission invention CN 101332854 A applied for in China by Shimano Corporation (JP) (SHIMANO KK), published 31.12.2008, transmission consists of a hermetic metallic lifting body of the planetary reduction and braking system mounted to a wheel hub spindle. Outside the body there is a gear shifting control unit attached.
Shortcomings for the transmission in question are as follows: a) critical density of the interacting high-precision assembly components running under considerable dynamic load and inside a limited space of the wheel hub, which requires extra expenditures for costly construction materials and complex processing technologies to be applied; b) limited space and hermetic body of the transmission prevent the heat release, in particular at braking, hence restrict the intensity of the transmission loading; c) the transmission
complexity requires special equipment for its mounting and does not allow for any maintenance or repair service outside the workshops equipped for the purpose.
There is a common knowledge bicycle mechanical stepped transmission as described in European Application No. EP 1980484 filed by SRAM CORP (US), published 15.10.2008. It has a pedal drive and contains a body that provides for the option of its mounting at a bicycle frame lower part; an output spindle mounted at the body and connected to the output cog wheel that transmits a rotary moment into the driving spindle of a vehicle; input spindle that provides for the option of connecting it to the vehicle crankset, its rotating axis along that of output spindle; a planetary gear type stepped reductor connected to the body. To enable gears shifting there is a rather complicated means provided for in the transmission that consists of a preventer, cable tie and motion control.
There are the following shortcomings for the stepped transmission in question: a) high technological complexity inherent to any planetary mechanism as directly evidenced by the fact that even conventional design schemes contain over one hundred of the essential assembly components, thus requiring non-efficient expenditures into manufacture of a number of details using valuable construction materials and complex processing technologies; b) the transmission complexity requires special equipment for its mounting and does not allow for any maintenance or repair service outside the workshops equipped for the purpose.
A nowadays stepped mechanical transmission described in the Patent of Ukraine No.67350U, author Y.V. Donchenko, has been set as a prototype. This stepped mechanical transmission for a vehicle is the closest in terms of its technical essence and the effect achieved.
The prototype contains a body that provides for the option of its mounting at a vehicle, output spindle that provides for the option of connecting it to the device for a rotary moment transmission into driving spindle of a vehicle; input spindle that provides for the option of connecting it to the vehicle crankset, its rotating axel is parallel to the axel of output spindle; a stepped reductor connected to the body, and a gear shifting device; according to the invention, the output spindle has a tube structure, the input spindle mounted along the same axel within the tubular output spindle housing; stepped reductor contains a transition spindle mounted in parallel to the input and output spindles, reductor being designed to contain at least three modules of external gearing cogwheel pairs of required velocity ratio value; among these the cogwheels of one side are rigidly mounted to, respectively, the input and transition spindles and constantly interlinked with a gear, while one cogwheel of each cogwheels pair of other modules is mounted rigidly to the output spindle, with another cogwheel of each cogwheels pair spinning freely around the transition spindle providing for the option of its rigid mounting to this spindle with a gear shifting device.
Among shortcomings of the transmission in question there may be indicated a high pressure at the spot of interlinking of the cogwheel teeth that at any given moment of time transmit the rotary moment through one contact dot only. As a driving wheel of pedal vehicle runs over a stepped obstacle, a sharp turn of pressure occurs that may exceed in dozens of times the estimated regulatory pressure onto the transmission cogwheels. This peculiarity requires to increase the area of contact dot and the cogwheels safety factor, that entails the overall increase of transmission dimensions and weight thus raising the expenditure of construction materials and the transmission costs.
Summary of the invention
A key task for the invention is to develop a design of stepped mechanical transmission, which would enable, by way of introducing an alternate embodiment for the type of constant gearing mechanical transmission between the spindles, as well as for the output spindle and/or for one of the star gears of the chain driving, the use of a lightweight gear reductor of external cogwheels gearing and/or the use of a chain and/or cog belt drive of constant gearing between the spindles, thus improving the weight and dimension characteristics of the transmission, reducing its production costs without prejudice to its life span, the ease of manufacturing and repairability.
The set task is fulfilled with the pedal drive vehicle stepped mechanical transmission design that contains a body that provides for the option of its mounting to a vehicle, tubular output spindle that provides for the option of connecting it to the device for a rotary moment transmission into driving spindle of a vehicle; input spindle that provides for the option of connecting it to the vehicle crankset, the driving spindle being mounted along the same axel within the housing of tubular output spindle, while its axis of rotation is parallel to that of the output spindle; stepped reductor containing transition spindle mounted in parallel to the driving and output spindles, reductor being designed to contain at least three modules of external gearing cogwheel pairs of required velocity ratio value; among these the cogwheels of one side are rigidly mounted to, respectively, the input and transition spindles, while one cogwheel of each cogwheels pair of other modules is mounted rigidly to output spindle, with another cogwheel of each cogwheels pair spinning freely around the transition spindle providing for the option of its rigid mounting to this spindle with a gear shifting device; and the gear shifting device that ensures constant inter-spindles gearing with chain and/or cog belt drive, with a rotary
vibration damper made of spring materials or springs installed into output spindle or one of the chain drive star gears.
Prevailing embodiment of the invention features a gear shifting device made of driven splined sliding bushings with forked carriers, where each cogwheel (star gear) engaging the bushing has a relevant device to gear respective bushing.
Another prevailing embodiment of the invention features a gear shifting device made as a blocker installed within the transition spindle. For example, the blocker may be designed as an assembly of a pusher, both ends tapered, installed within the housing of a hollow transition spindle and capable of moving along the axel of the transition spindle in both directions. Both of the tapered ends of the pusher interact with radially mounted into holes resilient pins capable of radial movements across the center of the transition spindle. The pin located outside the cogwheel and off-center the spindle, typically at the reductor housing wall, its end facing the outside of the spindle, interacts with a hold-down device triggered by a shifting mechanism at the pedal vehicle control unit. The pin under the cogwheel or the star gear that freely spins around transition spindle moving radially, is capable, with its outer end, to emerge outside the transition spindle and gear the cave at the inner surface of cogwheel register diameter. The blocker functions in the following way. The hold-down device triggered with the shifting mechanism located at the pedal vehicle control unit presses the pin outside the cogwheel, which, moving inside the transition spindle, presses outer tapered end of the pusher. Moving toward the cogwheel the pusher with its tapered end forces out the pin from under the cogwheel. The above pin, getting beyond cylindrical surface area of the spindle with its outer end, gears the cave of the cogwheel blocking it at the spindle in order to transmit the rotary moment onto the transmission output spindle
Another prevailing embodiment of the invention features a stepped reductor with gear shifting device, which has extra spindles and mechanical gearboxes to adjust the number of gears.
Due to its ability of absorbing shock pressure on the transmission generated when crossing a stepped obstacle the damper of rotary vibration reduces the load onto the contact dot between the cogwheel teeth, thus enabling to narrow its area proportionally reducing, eventually, dimensions and weight of the cogwheels in the gear drive.
Nature of the invention is detailed in a drawing.
Brief description of the drawings
Figure 1 provides a gearing diagram for the bicycle stepped mechanical transmission as a case example for the applied for transmission embodiment.
The drawing, as well as the description of a case example for the applied for transmission embodiment are only provided to illustrate the applied for invention and do not restrict the scope of protection as set in its relevant claims. In particular, the invention applied for could be utilized at any other pedal driven vehicle.
Bicycle mechanical stepped transmission is integrated into the lower part of a bicycle frame. For that purpose, it contains a body 1 integrated into the lower part of the frame, at the body there are an input spindle 2 that also serves as a spindle for bicycle crankset and an output spindle 3 that provides for the option of connecting it to the device of a rotary moment transmission onto the driving spindle of the bicycle via mounted on it driving gear (chain ring) 4 of the bicycle chain system 5. Output spindle 3 has a tube structure, and an input spindle 2 is axially aligned against it in its housing. One side of the transmission driving spindle 2 leans with a bearing against the body 1, another side leans with a bearing against the inside diameter of the output tubular spindle 3. At the body 1
there is also a transition spindle 6 mounted that leans with the bearings of its both sides against the body 1 and is installed in parallel to the output and input spindles. There are four modules of chain and/or cog belt drives (7 - 16 ) assembled into a reductor mounted at 2, 3, 6 spindles. Those modules of chain and/or cog belt drives have a velocity ratio of a required value, which ensures the star gears of chain and/or cog belt drives 7, 8 from one side are rigidly mounted to, respectively, input and transition spindles and are constantly interlinked with gears. Four star gears of chain and/or cog belt drives 9, 11, 13, 15 of each module are rigidly mounted to the output spindle 3, with their diameter gradually growing in the direction opposite to that of diameter size of the star gears of the transition spindle 6. The 10, 12, 14, 16 star gears are mounted to the transition spindle 6 and spin freely around it; linking with relative 9, 11, 13, 15 star gears at 3 output spindle through the chain and/or cog belt drive, these establish four chain and/or cog belt drives of the given velocity ratio values. The transmission includes gear shifting device mounted to the body 1 as a set of driven splined sliding bushings 17 with round spire through which forked carriers 18 run, which have a given angle of movement around their axel, attached to the other side of it there are balancing levers triggered by flexible cables from the gear selection conductor 19 mounted to the bicycle handlebar - it is omitted for clarity (in the drawing). The bushings are tightly linked with the splines to the transition spindle 6 following the hand of rotation and are capable of moving along those splines until running into gear with one of the four cogwheels 10, 12, 14, 16, which have relevant spline holes that provide for the option for rigid mounting of cogwheels 10, 12, 14, 16 to the transition spindle. At the chain ring (driving gear) 4 from the output spindle 3 onto the driving spindle of the vehicle there is a damper of rotary vibration 20 mounted, which , due to its ability of absorbing shock pressure in the transmission generated when crossing a stepped
obstacle, reduces the load onto the contact dot between the cogwheel teeth, thus enabling to narrow its area proportionally reducing, eventually, dimensions and weight of the cogwheels in the gear drive or size of the chain drive links or width of the cog belt drive.
The direction or rotation moment from input spindle 2 to output spindle 3, as well as gear shifting method remain true to the prototype.
Now therefore the applied for bicycle stepped mechanical transmission due to the use of constant gearing between the spindles instead of using (tooth) cog wheels of chain or cog belt drives and the installation of rotary vibration damper into the assembly of output spindle and/or one of the star gears of the chain drive, an opportunity is emerging to significantly enhance weight and dimension characteristics of a transmission without prejudice to the technological design simplicity and repairability, as well as to reduce its costs, improve reliability, extend the life-span.
Claims
1. Stepped mechanical transmission of a pedal driven vehicle containing a body that provides for the option of its mounting to a vehicle, tubular output spindle that provides for the option of connecting it to the device of a rotary moment transmission onto the vehicle driving spindle, input spindle that provides for the option of connecting it to the vehicle crankset, input spindle being installed along the axis of the output tubular spindle inside its housing, its rotation axis parallel to that of the output spindle, a stepped reductor that contains a transition spindle parallel to the input and output spindles, the reductor being designed to contain at least three modules of cog wheel pairs, among these the cogwheels of one side are rigidly mounted to, respectively, the input and transition spindles, while one cogwheel of each cogwheels pair of other modules is mounted rigidly to output spindle, with another cogwheel of each cogwheels pair spinning freely around the transition spindle providing for the option of its rigid mounting to this spindle with a gear shifting device, and the gear shifting device, which is characterized by that its constant gearing between the spindles is provided with chain and/or cog belt drive, while there is a damper of rotary vibration made of springs or spring materials mounted into output spindle or one of the chain drive star gears.
2. Stepped mechanical transmission according to the claim 1, which is characterized by that its gear shifting device is designed as a set of driven splined sliding bushings with forked carriers, where each cogwheel (star gear) engaging the bushing has a relevant device to gear respective bushing.
3. Stepped mechanical transmission according to any of the claims 1 to 2, which is characterized by that its gear shifting device is designed as a blocker inside the transition spindle.
4. Stepped mechanical transmission according to any of the claims 1 to 3, which is characterized by that its stepped reductor along with gear shifting device are equipped with extra spindles and mechanical gearboxes that adjust the number of gears.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| UAA201303860 | 2013-03-28 | ||
| UA201303860 | 2013-03-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2014158120A1 true WO2014158120A1 (en) | 2014-10-02 |
Family
ID=48782586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/UA2013/000040 WO2014158120A1 (en) | 2013-03-28 | 2013-04-09 | Stepped mechanical transmission |
Country Status (1)
| Country | Link |
|---|---|
| WO (1) | WO2014158120A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10793222B1 (en) | 2017-03-21 | 2020-10-06 | Jonathan K. Harris | Bicycle derailleur having upper and lower alignment assemblies |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB444433A (en) * | 1935-02-27 | 1936-03-20 | Wilhelm Goeckel | Improvements in or relating to cycle drives |
| DE19807408A1 (en) * | 1998-02-20 | 1999-09-09 | Schneider Gmbh & Co Kg Franz | Pedal crank drive for pedal car or other play vehicle |
| WO2000075005A1 (en) * | 1999-06-04 | 2000-12-14 | Llibrer Porcar Jose | Bottom bracket shell with built-in micro-derailleur for bicycles |
| US20040066017A1 (en) * | 2002-10-04 | 2004-04-08 | Dratewski George J. | Bicycle drive train |
| UA67350A (en) | 2003-09-01 | 2004-06-15 | Acad Med Sciences Ukraine | Method for preoperative procedures |
| EP1980484A1 (en) | 2007-04-11 | 2008-10-15 | Sram Corporation | Mounting system for an internal bicycle transmission |
| CN101332854A (en) | 2007-06-28 | 2008-12-31 | 株式会社岛野 | Internal transmission hub assembly |
| WO2011014915A1 (en) * | 2009-08-04 | 2011-02-10 | Ryan Burke | A torsion cushioning sprocket |
-
2013
- 2013-04-09 WO PCT/UA2013/000040 patent/WO2014158120A1/en active Application Filing
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB444433A (en) * | 1935-02-27 | 1936-03-20 | Wilhelm Goeckel | Improvements in or relating to cycle drives |
| DE19807408A1 (en) * | 1998-02-20 | 1999-09-09 | Schneider Gmbh & Co Kg Franz | Pedal crank drive for pedal car or other play vehicle |
| WO2000075005A1 (en) * | 1999-06-04 | 2000-12-14 | Llibrer Porcar Jose | Bottom bracket shell with built-in micro-derailleur for bicycles |
| US20040066017A1 (en) * | 2002-10-04 | 2004-04-08 | Dratewski George J. | Bicycle drive train |
| UA67350A (en) | 2003-09-01 | 2004-06-15 | Acad Med Sciences Ukraine | Method for preoperative procedures |
| EP1980484A1 (en) | 2007-04-11 | 2008-10-15 | Sram Corporation | Mounting system for an internal bicycle transmission |
| CN101332854A (en) | 2007-06-28 | 2008-12-31 | 株式会社岛野 | Internal transmission hub assembly |
| WO2011014915A1 (en) * | 2009-08-04 | 2011-02-10 | Ryan Burke | A torsion cushioning sprocket |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10793222B1 (en) | 2017-03-21 | 2020-10-06 | Jonathan K. Harris | Bicycle derailleur having upper and lower alignment assemblies |
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