WO1995001277A1 - Automatic continuously adjustable bicycle drive - Google Patents

Automatic continuously adjustable bicycle drive Download PDF

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Publication number
WO1995001277A1
WO1995001277A1 PCT/PL1994/000013 PL9400013W WO9501277A1 WO 1995001277 A1 WO1995001277 A1 WO 1995001277A1 PL 9400013 W PL9400013 W PL 9400013W WO 9501277 A1 WO9501277 A1 WO 9501277A1
Authority
WO
Grant status
Application
Patent type
Prior art keywords
toothed
characterized
bicycle drive
segments
drive according
Prior art date
Application number
PCT/PL1994/000013
Other languages
German (de)
French (fr)
Inventor
Jaroslaw Piotr Warszewski
Original Assignee
Jaroslaw Piotr Warszewski
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

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B62LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62MRIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M9/00Transmissions characterised by use of an endless chain, belt, or the like
    • B62M9/04Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio
    • B62M9/06Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
    • B62M9/08Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving eccentrically- mounted or elliptically-shaped driving or driven wheel; with expansible driving or driven wheel

Abstract

Automatic continuously adjustable bicycle drives are already known. Their design and construction are however considerably costly, in particular to achieve fine adjustment steps with a Bowden wire lever and a transmission device. In order to reduce construction costs and to improve the efficiency of the drive, the chain wheel (2) connected to the hub (3) of the rear wheel consists of several tooth segments (6), i.e. of at least three tooth segments whose outer circumference provided with teeth (7) is an involute. The tooth segments are swivellingly received against the force of a restoring spring (8) in a housing (10) preferably mounted on the free-wheel (9) of the hub (3). This bicycle drive may be used in all bicycles, even bicycles with particularly high cross-country mobility requirements.

Description

Infinitely automatically adjustable bicycle drive

The invention relates to a continuously automatically ver ¬ adjustable bicycle drive, wherein the restriction means as Kraftübertra¬ from the pedal crank provided with a ring gear, the ring gears encircling endless flexible traction means, in particular a toothed belt, is provided.

To achieve a long life with bike drives by allowing for easy maintenance of low cost, a silent work and an environmentally friendly behavior is becoming more common departed from the roller chain as the power transmission means and it used a toothed belt. One possible embodiment of a bicycle drive using a toothed belt is disclosed in DE-OS 34 43 042nd

Regardless of whether a roller chain or a toothed belt for use occurs in bicycle transmission, it is known to adjust the gear ratio continuously automatically. It is a variable chain drive by the DE-OS 33 18 278, in particular for bicycles, known in which the drive sprocket of four segments, of which two opposing segments are provided with teeth, wherein all of the segments between a small and a large diameter are radially displaceable by a spindle drive. A disadvantage of this variable drive chain, which can also be replaced by a toothed belt drive, however, is that for the initiation of the displacement of the chain driving wheel segments by the associated segments spindles a timing chain as an additional Betätigungε- elements on the bicycle is necessary, the relative rotation of with initiates the spindles associated bevel gears, and with the interposition of a ring gear on which the bevel gears in mesh. The be¬ but indicated that on the comb relatively by rotation of the ring gear to the ring gear, the bevel gears. The however be ¬ indicated that the spindles rotate by rotation of the ring gear relative to the sprocket, so that, although can be varied as desired, the diameter and thus the transmission ratio, but this is possible in addition to the addition to actuating the timing chain with a large structural complexity.

This relatively large structural complexity is not avoided even with the continuously variable bicycle transmission according to the DO-OS 40 31 865th This bicycle transmission operates on the basis of push rods, which are provided with Rastergleitεteinen, have the saw teeth and are guided on the inside of a groove in the sprocket. In this case, the engagement point of the Rastergleitsteine ​​can be continuously adjusted by a rotatable centrally mounted to the sprocket base plate as well as a pen holder, so that upon rotation takes place a change in the transmission ratio. However, the displacement of the engagement point of the Rastergleitsteine ​​over the rotatably mounted base plate does not constitute, an additional construction effort.

A further accordance with the DD-PS 255 922 a known, finely diversifiable chain drive, in which at the same time the dead centers to be easily overcome and which in particular the Übersetzungsverhältins depending on spent pedal force is set, provides that a seated on the bottom bracket shaft crank star below alia is connected to a parallel guide, are arranged on the two gear segments displaceable in a radial direction. By compression springs which are disposed between the bottom bracket and the toothed segments, ensures that the toothed segments are shifted outwards, as soon as an existing lock is released. In this chain drive from the locking saw-toothed recesses in the parallel guide, as well as bolts, in which a tooth segment are guided transversely to the displacement direction and are pressed against the force of a spring by a cam in the recesses there. In this case, the cam is rotated through a bowdenzugbetätigten lever and by a transfer device. Thus, also in this chain drive in addition to a significant structural complexity requires comply for its operation to a fine level adjustment, as additional operational components, a bowdenzugbetätigen lever and a transmission device.

Otherwise it behaves in the continuously manually adjustable travel drive according to DD-PS 284 451 in which a shift lever must be actuated to change the gear ratio also to act via a Bowden cable for adjusting to a loading or discharge of transmission elements comes to be pressed by rolling in the guide tracks of the conical disks cylindrical rollers outward or go to a smaller diameter level.

The invention has for its object to provide a stepless automatic variable bicycle drive, wherein the encircling using the sprockets endless flexible traction means, in particular a toothed belt, with a minimum of constructional effort, so even with avoidance of additional components, such as bodenzugbetätigter lever, which Überset¬ zungsverhältins adjustable exclusively in dependence on the spent pedal force is, at the same time also possible dead centers are more easily be overcome by further increasing the efficiency.

According to the invention the object is achieved in that the standing in connection with the wheel hub of the rear wheel sprocket consists of several uniformly arranged on the circumference of the wheel hub of the rear wheel gear segments, the involute formed on its outer toothed periphery and pivotally in the region of its rear end against are mounted, the force of a return spring and is received by a preferably can be brought to the freewheeling of the hub housing.

In this case, a preferred embodiment of the invention is that the tooth segments receiving housing consists of two possessing at its outer periphery lugs discs, between which the toothed segments are arranged, wherein a guided by the tabs of the disks the tooth segments in its rear portion pivotally receiving pin is protruding with its one end of one of the two disks and receives the helical part of the return spring on this end, while one tangentially outgoing from the helical part of the return spring end of the two discs and the second tangentially outgoing end in the tensioned state of the return spring with distance from the helical part of the return spring penetrates the toothed segment in its front region.

The toothed segments are advantageously accommodated by the housing, ie the discs so that in the direction of rotation of the toothed belt of the toothed each tooth segment having the greatest distance to the axis of provided with the crank sprocket including the periphery of the group consisting of tooth segments ring gear, in rest position, each tooth segment having the smallest distance from the axis of the wheel hub of the rear wheel.

In order to limit the pivotal movement of the tooth segments in the tensioned state of the return springs inwardly er¬ this limit the toothed segment follows outgoing by abutment of the second tangentially from the helical part of the return springs, penetrating end at the outer periphery of at least one disc. The pivotal movement of the tooth segments in the tensioned state of the return springs inwards can therefore also be limited, which is of course also possible by this limitation tangentially outgoing by abutment of each toothed segment at the first from the helical part of the associated direction of rotation downstream of the sector gear return spring, the two forming the housing discs penetrating end takes place.

By such an inventive design of communicating with the wheel hub of the rear wheel sprocket a continuously automatically adjustable bicycle drive is provided, by which it is possible to adjust automatically the transmission ratio without additional components such as bo- wdenzugbetätige lever. The setting of the transformation ratio Überset¬ takes place solely in Abhän¬ dependence of the force applied to the pedal cranks. If this force is so great, which is the case, for example, on climbs, so this force transfers via the toothed belt to the tooth flanks of the tooth segments forces the toothed segments are pivoted against the force of the return springs around the axis of the toothed segments pivotally receiving pin out of the housing so that the outer diameter of the toothed segments is increased, so is established a smaller gear ratio. In this case, the load on the tooth flanks of the Zahnεegmente occurs differently, causing the timing belt in the area of ​​tooth segments consisting of the ring gear does not move on a circular path but on a path differing therefrom. but contributes to that possible dead center positions to be overcome, so that the torques by the toothed belt of the toothed ring provided with the Trerkurbel the group consisting of toothed segments, associated with the wheel hub of the rear wheel sprocket are transmitted evenly. It is advantageous if the in communication with the wheel hub of the rear wheel gear consisting of three toothed segments. Au ¬ ßerdem should be a more exciting the timing belt tensioner be subordinated to the existing segments of tooth rear sprocket. Instead of consisting of the helical part and the two tangentially outgoing from this helical part ends return spring, any other spring bodies can of course be used, which is capable of the tooth segments of the toothed ring pull in inwardly into the housing, such as a tension spring.

If the continuously automatically adjustable bicycle drive with the existing three toothed segments ring gear coming in bicycles for use, are placed on the particularly high with respect to the off-road performance requirements, there is according to a further feature of the invention is also provided with the pedal crank gear of a plurality of, preferably from three, evenly spaced around its circumference tooth segments, which are incorporated at its outer periphery open housing, exerted is force which is on the other hand mounted in the region of the axis of the ring gear provided with the Trerkurbel on the housing on the one hand at the front of the tooth segment and. It can come as a compression spring, each spring body on the application, which is adapted to press the tooth segments to the outside; such as a telescoping spring in the form of a gas spring or a hydraulic spring. It is also possible to use a coil spring is possible.

By this design of the provided with the crank sprocket is made possible that, when a level road on which the bicycle is moving, the toothed segments under Be¬ account the low loading of the tooth flanks of the teeth from their housing by the compression springs are expressed manufacturer. but, at the same time be pulled through the small load on the tooth flanks of the tooth segments of the toothed belt by the return springs inward into the housing the tooth segments of the toothed ring engaged with the hub of Hin¬ terrades in conjunction, so that automatically a large transmission ratio results. however, the bike moves on a track with great. Slope, then the tooth segments of the provided with the crank sprocket by the elevated apply forces through the toothed belt against the force of the compression springs pressed inwards - of the diameter of this ring gear is reduced - at the same time by these forces, the tooth segments of the toothed ring, which with the wheel hub is connected to the rear wheel, be pivoted against the force of the return springs from its housing, so that the diameter of this ring gear increases. But this is equivalent to saying that the transmission ratio decreases.

In order to avoid too high a load on the individual teeth of the toothed segment are on each tooth segment which meshes with the toothed belt in engagement, be at least three teeth engaged therewith.

A simpler construction can be achieved when the toothed segments the receiving housing forming the outer wall of the freewheel time.

It is convenient if both the springs and the return springs for different forces are designed depending on the mass of the bike the person using it. It should be provided for people with low mass bikes relatively small forces should exert on the toothed segments a relatively large force. The invention will be explained in more detail below using exemplary embodiments. In the accompanying drawings:

Fig. 1 is a front view of a stepless automatic variable bicycle drive in schematic

Presentation,

Fig. 2 is a front view of the rear sprocket of the bicycle drive,

Fig. 3 is a front view of a pedal crank with the ver¬-bound front sprocket

As Fig. 1 shows, the infinitely adjustable automatically ver¬ bicycle drive to a ver¬ with the pedal crank 1-bound ring gear 2 and a 3 are arranged on the wheel hub of the rear wheel not shown tooth rim 4. Both sprockets 2; 3 are embraced by a toothed belt 5 which is' tensioned by a belt tensioner. 5 The ring gear 4 has three evenly across the periphery of the wheel hub of the rear wheel 3 disposed toothed segments 6, the peripheral is provided at its inner periphery circular in shape and at its outer, with teeth 7 (Fig. 2) are formed in an involute. On these portions of the involute toothed segments 6 of the toothed belt 5 is on. The toothed segments 6 are mounted in the region of its rear end pivoted against the force of a return spring 8 and received by a preferably applied to the free wheel 9 of the wheel hub 3 housing 10th In Fig. 1, the return spring 8 is formed as a tension spring 8 ', which is in the region of the front end of the toothed segments 6 connected thereto. According to Fig. 2 there is the toothed segments 6 female housing 10 from two plates 11 provided with disks 12, between which the toothed segments 6 are arranged. The return spring 8 is formed as a spiral spring.

By each tab 11 is a tooth segments is guided in its rear portion pivotally receiving pin 13 6, which protrudes with its one end from the one disk 12th On this end of the bolt 13 of the helical part 14 of the trained as a return spring 8 Deten spiral spring is arranged. From this helical part 14 go two ends 15; 16 tangentially from, one of which is engaged by the first tangentially outgoing end 15 in the two discs 12 and thereby fixed, while the second tangentially outgoing end 16 in the tensioned state of the return spring 8 a distance from the helical portion 14 of the return spring 8, the sector gear 6 in its front portion penetrates.

The εtufenlose, automatic adjustment of the Fahrradan¬ drive occurs in dependence on the front of the ring gear 2 via the toothed belt 5 to the rear toothed wheel 4, that is to say the tooth flanks 18 of the toothed segments 6, the transmitted force. If by the cyclist, a greater amount of force to the forward movement of the bicycle, for example, on climbs, required iεt, the Zahnεegmente be 6 auε about the axis of the toothed segments 6 pivotally receiving pin 13 against the force of Rückεtellfedern 8 the auε the discs 12 beεtehenden housing 10 pivoted, so that with increasing expenditure of force for the cyclist, the outer diameter of the toothed segments 6 is increased, leading to a smaller gear ratio increases again. Hereby is achieved that the force of the Radfahrerε can remain approximately the same. In connection with the formation of the involute toothed segments 6 is achieved that the toothed belt 5 comprises 2/3 of the circumference of the ring gear 4, εo that a high Wirkungεgrad is achieved. In order that a too large expenditure of energy on a single tooth 7 deε Zahnεegmenteε 6 avoided, this is preferably auεgebildet that εtändig are at least a toothed segment 6, three teeth 7 engaged.

The pivoting movement of the toothed segments 6 inwardly clamped in the overall condition of the return springs 8 8 is in the embodiment deε ring gear 4 of Figure 2 through both ta¬ gential outgoing from the helical portion 14 ends. 15; limited 16, as outgoing by the stop deε second tangentially from the helical part 14 of the return spring 8, the respective toothed segment 6 penetrating end 16 on the outer periphery of at least one disc 12 of the housing 10th

From Fig. 3 it is apparent that also in communication with the crank gear 1 2 can beεtehen of tooth segments 19, with three toothed segments 19 are arranged uniformly on its circumference in the dargeεtellten embodiment. In this case, these toothed segments 19 have an outer, fitted with teeth 20, involute section. They are pivotally mounted at its rear end on a pin 21 and received by a stationary with the pedal crank 1 in connection, open at its outer circumference housing 22nd

The Zahnεegmente 19 of the ring gear 4 under the force of compression springs 23. This can be formed as coil springs, as well as telescopic springs. The compression springs 23 are with their lower end in the area of ​​Achεe deε ring gear 2 is preferably on the bearing of the pedal crank 1 and secured at its upper end to the front end of the pivotable toothed segment 19th 19 thereby pivot the toothed segments with its front end in the unloaded Zuεtand outward. Dieεe pivotal movement iεt limited by a stop, the iεt arranged when using a telescoping spring in this itself.

the toothed belt 5 is located on the toothed segments 19 of the ring gear 2, into the teeth 20 engaging on. At high force required for depressing the ring gear 2, the gear segments 19 are pressed against the force of the compression springs 23 inward. To pan, located daε Überεetzungεverhältnis reduced greatly.

This design of the erfingungsgemäßen solution is therefore particularly suitable for sport bikes, such as mountain bikes, are suitable. By Einεatz of return springs 8 and / or pressure springs 23 having different spring characteristics of the exact amount of force by the cyclist can be adjusted.

Statement of Beugszeichen used

1 crank

2 sprocket

3 hub 4 ring gear

5 Timing belt

5 'belt tensioner

6 toothed segments

7 tooth 8 return spring

8 'tension spring

9 freewheel

10 housing

11 tabs 12 slices

13 pin

14 wendeiförmiger part of the return spring 8

15 tangentially first outgoing end

16 tangentially second outgoing end 18 of the tooth flank

19 toothed segment

20 tooth

21 pin

22 casing 23 compression spring

Claims

claims
1. Infinitely automatically adjustable bicycle drive, wherein as Kraf transmission means of the provided with the crank sprocket to the end connected to the wheel hub of the rear wheel sprocket a the gear rings encircling endless, flexible train ¬ medium, in particular a toothed belt, is provided, characterized in that of the wheel hub (3) of the rear wheel related gear rim (4) of a plurality of uniformly on the circumference of the wheel hub (3) of the rear wheel arranged toothed segments (6), is formed, the circumferential provided at its OUTER with teeth (7) evolventenformig and εind recorded mounted in the region of its rear end pivoted against the force of a return spring (8) and can be brought from one to preferably the freewheel (9) of the wheel hub (3) housing (10),
2. The bicycle drive according Anεpruch 1, characterized in that daε the toothed segments (6) receiving the housing (10) auε two at its outer periphery lugs (11) possessing discs (12), between which the toothed segments (6) are arranged, wherein by the tabs (11) of the discs (12) the toothed segments (6) in its rear portion pivotally receiving pin (13) is guided, which protrudes with its one end of one of the two discs (12) and to this end the wendelformigen part (14) of the return spring (8) accommodates, while the one from the wendelfόrmigen part (14) of the return spring (8) tangentially outgoing end (15), the two discs (12) and the second tangentially outgoing end (16) in the tensioned state of the restoring spring (8) penetrates the toothed segment (6) in its front region.
3. The bicycle drive according to claim 1 and 2, characterized ge ¬ indicates that in the rotational direction of the toothed belt (5) of the teeth of each toothed segment (6), the ring gear loading under Ein¬ relationship of the circumference of from tooth segments (6) (4) the greatest distance to the axis of the Trerkurbel (1) provided with gear ring (2) has, in the rest position of each Zahnεegmenteε (6) the kleinεten Abεtand to the axis of the wheel hub (3) of the rear wheel has.
4. The bicycle drive according to claim 1 to 3, characterized denotes ge, that in the tensioned state the residue is springs (8) the pivotal movement of Zahnεegmente (6) inwards by abutment of the second tangentially from the helical part (14) of the return springs (8) outgoing, the toothed segment (6) penetrating the end (16) is delimited on the outer periphery of at least one disc (12).
5. The bicycle drive according to claim 1 to 3, characterized denotes ge that springs in the tensioned state the back (8) the pivotal movement of the tooth segments (6) inwards by abutment of each toothed segment (6) at the first from the helical portion (14) of the the direction of rotation downstream of the toothed segment (6) zu¬ parent return spring (8) tangentially outgoing, the two discs (12) penetrating end (15) is limited.
6. Bicycle drive according to claim 1 to 3, characterized gekenn¬ characterized in that the return springs (8) and tension springs (8 ') are formed.
7. bicycle drive according to claim 1 to 3, characterized denotes ge that the return springs (8) are formed as springs Biege¬.
8. bicycle drive according to claim 1 to 7, characterized ge ¬ indicates that the existing of toothed segments (6) toothed ring (4) is arranged downstream of a toothed belt (5) exciting belt tensioner (5 ').
9. bicycle drive according to claim 1 to 7, characterized denotes ge that the wheel hub (3) of the Hin ¬ terrades is related gear rim (4) made up of three toothed segments (6).
10. The bicycle drive according to claim 1 to 9, characterized indicates overall that with the pedal crank (1) provided
Sprocket (2) consists of several, preferably three, evenly spaced around its circumference tooth segments (19) which is provided at its outer, with teeth (20) formed circumferential involute and pivotably mounted in the region of its rear end and of one with the pedal crank (1) communicating, open at its outer peripheral housing (22) are accommodated, each toothed segment (19) auεgeübten force below that of a compression spring (23), on the one hand at the front of the tooth segment (19) and on the other hand, in region of the axis of the pedal crank with (1) the ring gear (2) provided iεt attached to the housing (22).
11. The bicycle drive according to claim 10, characterized marked characterized in that the pressure springs (23) are designed as telescopic springs.
12. The bicycle drive according to claim 10, characterized gekenn¬ characterized in that the pressure springs (23) are formed as coil springs.
13. The bicycle drive according to one or more of claims 1 to 10, characterized in that on each tooth segment (6; 19), which engages with the toothed belt (5) engages at least three teeth (7; .20) are engaged.
14. The bicycle drive according to claim 1 and 2, characterized denotes ge that the toothed segments (6) receiving the housing (10) forms the outer wall of the freewheel.
PCT/PL1994/000013 1993-06-29 1994-06-28 Automatic continuously adjustable bicycle drive WO1995001277A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19934322382 DE4322382A1 (en) 1993-06-29 1993-06-29 Infinitely automatically adjustable bicycle drive
DEP4322382.6 1993-06-29

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PL30863694A PL173215B1 (en) 1993-06-29 1994-06-28 Automatic variable-transmission for bicycles

Publications (1)

Publication Number Publication Date
WO1995001277A1 true true WO1995001277A1 (en) 1995-01-12

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/PL1994/000013 WO1995001277A1 (en) 1993-06-29 1994-06-28 Automatic continuously adjustable bicycle drive

Country Status (2)

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DE (1) DE4322382A1 (en)
WO (1) WO1995001277A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772546A (en) * 1993-06-29 1998-06-30 Warszewski; Jaroslaw Piotr Continuously variable automatic drive
ES2125122A1 (en) * 1994-10-28 1999-02-16 Rodriguez Jose Antonio Tovar Self-adaptable system for transmission of the torque/speed for vehicles

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0877700A1 (en) * 1996-11-28 1998-11-18 BÄCHTIGER, Rolf Chain drive with variable transmission ratio
US9238235B2 (en) 2013-02-28 2016-01-19 Omachron Intellectual Property Inc. Cyclone such as for use in a surface cleaning apparatus

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935751A (en) * 1975-01-06 1976-02-03 Lee Kuang Chang Centrifugal stepless speed changing device
US4373926A (en) * 1980-07-21 1983-02-15 Fullerton Robert L Automatic transmission having a continuously variable drive ratio
EP0112112A1 (en) * 1982-12-14 1984-06-27 Michel Deal Variable ratio transmission
WO1984002562A1 (en) * 1981-10-26 1984-07-05 Harold L Walker Automatic variable speed transmission
DE4318648C1 (en) * 1993-06-04 1994-07-14 Kraemer Hubert Dipl Ing Fh Belt drive with selbttätiger stepless gear change, in particular for bicycles

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3935751A (en) * 1975-01-06 1976-02-03 Lee Kuang Chang Centrifugal stepless speed changing device
US4373926A (en) * 1980-07-21 1983-02-15 Fullerton Robert L Automatic transmission having a continuously variable drive ratio
WO1984002562A1 (en) * 1981-10-26 1984-07-05 Harold L Walker Automatic variable speed transmission
EP0112112A1 (en) * 1982-12-14 1984-06-27 Michel Deal Variable ratio transmission
DE4318648C1 (en) * 1993-06-04 1994-07-14 Kraemer Hubert Dipl Ing Fh Belt drive with selbttätiger stepless gear change, in particular for bicycles

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5772546A (en) * 1993-06-29 1998-06-30 Warszewski; Jaroslaw Piotr Continuously variable automatic drive
ES2125122A1 (en) * 1994-10-28 1999-02-16 Rodriguez Jose Antonio Tovar Self-adaptable system for transmission of the torque/speed for vehicles

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