GB2254298A - Bicycle transmission mechanism - Google Patents
Bicycle transmission mechanism Download PDFInfo
- Publication number
- GB2254298A GB2254298A GB9106784A GB9106784A GB2254298A GB 2254298 A GB2254298 A GB 2254298A GB 9106784 A GB9106784 A GB 9106784A GB 9106784 A GB9106784 A GB 9106784A GB 2254298 A GB2254298 A GB 2254298A
- Authority
- GB
- United Kingdom
- Prior art keywords
- gear
- bicycle
- transmission shaft
- transmission mechanism
- rear wheel
- 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.)
- Withdrawn
Links
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
- B62M17/00—Transmissions characterised by use of rotary shaft, e.g. cardan shaft
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Gear Transmission (AREA)
- Automatic Cycles, And Cycles In General (AREA)
Abstract
The transmission mechanism comprises a transmission shaft 11 received inside a protective sleeve 10, which is connected between the bottom bracket bearing axle and the rear wheel hub 19 of a bicycle. The bicycle is driven by foot pedals through the transmission mechanism to propel the rear wheel of said bicycle to rotate. The transmission shaft may have a pair of universal joints to absorb shock waves. <IMAGE>
Description
STRUCTURE OF BICYCLE TRANSMISSION MECHANISM
The present invention relates to bicycle transmission mechanisms and relates more particularly to a bicycle transmission mechanism which transmits motive force from foot pedals to the wheels of a bicycle by means of gears and transmission shaft.
In early days, bicycle was specifically designed for use as a vehicle for transportation. In recent years, various types of bicycles have been disclosed to provide different functions for different purposes. Conventional bicycles may be different from one another in various aspects, they are commonly propelled by foot pedals through the operation of a chain gearing. Disadvantages of chain transmission are numerous and outlined hereinafter.
1. Motive force from foot pedals can not be completely directly transmitted through the chain because it is somewhat loosely mounted on the chain wheel and the rear hub sprocket:
2. The connecting links of the chain may be disconnected from the teeth of the chain wheel or the rear hub sprocket or damaged easily causing transmission error;
3. Because the chain, the chain wheel and the rear hub sprocket must be frequently lubricated with lubricating grease, rider's clothes may be contaminated by the lubricating grease easily during riding.
The present invention has been accomplished to eliminate the aforesaid problems. It is therefore an object of the present invention to provide a bicycle transmission mechanism which transmits motive force from foot pedals by transmission shaft and gears.
It is another object of the present invention to provide a bicycle transmission mechanism which provides high performance and is durable in use.
It is still another object of the present invention to provide a bicycle transmission mechanism which is completely enclosed to prevent from contamination.
An embodiment of the present invention will now be described by way of example with reference to the accompanying drawings in which:
Fig. 1 is a dismantled perspective view of the preferred embodiment of the bicycle transmission mechanism of the present invention;
Fig. 2 illustrates the main structure of a bicycle constructed according to the present invention, wherein two transmission mechanisms of the present invention are bilaterally connected between the bottom bracket bearing axle and the rear wheel hub of said bicycle; and
Fig. 3 illustrates an alternate form of transmission shaft according to the present invention.
Referring to the various drawings attached hereuith, a detailed description of the structural features of "Structure of Bicycle Transmission Mechanism" of the present invention is as follows:
Referring to Fig. 1, a bicycle transmission mechanism in accordance with the present invention comprises a transmission shaft 11 received inside a sleeve 10, having two opposite ends respectively coupled with a bevel gear 12 or 13 each. The first bevel gear 12 of the transmission shaft 11 is covered with a casing 14 which is connected to a socket 17 which is mounted on the sleeve 10 at one end.
The casing 14 has a circular covering 15 at one side for holding a bevel gear 16 which is mounted on the bottom bracket bearing axle 23 and driven by the crank 22 to drive the first bevel gear 12 of the transmission shaft 10 to rotate. The size of the bevel gear 16 is relatively larger than the first bevel gear 12 of the transmission shaft 11.
The second bevel gear 13 of the transmission shaft 11 is covered with an angle fitting 18, which is connected to a socket 21 which is mounted on the sleeve 10 at an opposite end, and engaged with a bevel gear 20 which is mounted on the rear wheel hub 19. In an alternate form of the present invention, helical or worm gears may be used to replace the bevel gears 12, 13, 16 and 20 respectively.
Referring to Fig. 2, the transmission mechanism of the present invention is mounted on the tubular metal frame of a bicycle at either side with the sleeve 10 thereof connected between the bottom bracket bearing axle 23 and the rear wheel hub 19 of said bicycle. When the crack 22 is rotated, the bottom bracket bearing axle 23 is driven to carry the transmission shaft 10 to rotate via the bevel gears 16 and 12. Rotating the bevel gear 16 causes the bevel gear 13 to drive the bevel gear 20 to carry the rear wheel hub 19 and the rear wheel 24 to rotate. Therefore, the bicycle is propelled to move.
Referring to Fig. 3, there is illustrated an alternate form of transmission shaft according to the present invention. As shown in the drawing, two sets of double universal joints 111 and 112, 113 and 114 are respectively connected to the transmission shaft 11 at two opposite ends.
By means of the operation of the double universal joints 111 and 112, 113 and 114, shock waves are eliminated from transmitting to the transmission shaft 11 when the bicycle bumps along the road or against an object. Therefore, the transmission shaft 11 is constantly maintained in position for high performance.
Claims (4)
1. A transmission mechanism for a bicycle, the improvement comprising:
a transmission shaft received inside a sleeve, having a first gear fixedly mounted thereon at one end and a second gear fixedly mounted thereon at an opposite end, said sleeve having a first socket means mounted thereon at one end and a second socket means mounted thereon at an opposite end;
a first angle fitting to connect said first socket means to a bottom bracket bearing axle;
a second angle fitting to connect said second socket means to a rear wheel hub;
a crank mounted on said bottom bracket bearing axle, having a driving gear fixedly mounted thereon and received in said first angle fitting and engaged with said first gear; and
a driven gear set inside said second angle fitting and driven by said second gear to drive said rear wheel hub to rotate.
2. The improvement of claim 1, wherein said first gear, said second gear, said driving gear and said driven gear can be each made of a bevel gear, a worm gear or a spiral gear.
3. The improvement of claim 1, wherein said transmission shaft has two opposite ends respectively coupled 4ith a double universal joint each.
4. A transmision mechanism for a bicycle substantially as hereinbefore described with reference to, and as illustrated in Figures 1 and 2 or Figure 3 of the accompanying drawing.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9106784A GB2254298A (en) | 1991-04-02 | 1991-04-02 | Bicycle transmission mechanism |
| FR9104240A FR2674812B3 (en) | 1991-04-02 | 1991-04-08 | TRANSMISSION MECHANISM STRUCTURE FOR BICYCLES. |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB9106784A GB2254298A (en) | 1991-04-02 | 1991-04-02 | Bicycle transmission mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB9106784D0 GB9106784D0 (en) | 1991-05-22 |
| GB2254298A true GB2254298A (en) | 1992-10-07 |
Family
ID=10692450
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB9106784A Withdrawn GB2254298A (en) | 1991-04-02 | 1991-04-02 | Bicycle transmission mechanism |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR2674812B3 (en) |
| GB (1) | GB2254298A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6177438B1 (en) | 1993-07-23 | 2001-01-23 | Toray Industries, Inc. | Morphinan derivatives and pharmaceutical use thereof |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4664215A (en) * | 1985-03-04 | 1987-05-12 | Yamaha Hatsudoki Kabushiki Kaisha | Shaft drive for balloon tired motorcycle |
| GB2228238A (en) * | 1988-12-14 | 1990-08-22 | Yu Fu Traffic Supplier Ltd Co | Shaft driven bicycle |
-
1991
- 1991-04-02 GB GB9106784A patent/GB2254298A/en not_active Withdrawn
- 1991-04-08 FR FR9104240A patent/FR2674812B3/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4664215A (en) * | 1985-03-04 | 1987-05-12 | Yamaha Hatsudoki Kabushiki Kaisha | Shaft drive for balloon tired motorcycle |
| GB2228238A (en) * | 1988-12-14 | 1990-08-22 | Yu Fu Traffic Supplier Ltd Co | Shaft driven bicycle |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6177438B1 (en) | 1993-07-23 | 2001-01-23 | Toray Industries, Inc. | Morphinan derivatives and pharmaceutical use thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| GB9106784D0 (en) | 1991-05-22 |
| FR2674812A3 (en) | 1992-10-09 |
| FR2674812B3 (en) | 1993-04-09 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US5158314A (en) | Bicycle with traction on both wheels | |
| US4685692A (en) | Foot pedal or arm crank driven riding bicycle | |
| US7487854B2 (en) | Two-wheel drive two-wheeled vehicle | |
| US8689957B2 (en) | Two-wheel drive two-wheeled vehicle | |
| US3045772A (en) | Drive for motor bikes | |
| US5224725A (en) | Two-wheeled-drive two wheeled vehicle | |
| GB2116498A (en) | Motor tricycle | |
| US6182991B1 (en) | Two wheel drive bicycle with a shock-absorbing front fork | |
| US6505699B1 (en) | Two-wheel drive two-wheeled vehicle | |
| US6161854A (en) | Two-wheel drive bicycle | |
| WO1997041024B1 (en) | Two-wheel drive bicycle | |
| US6095540A (en) | Rotary drive means for front wheel drive bicycle | |
| GB2254298A (en) | Bicycle transmission mechanism | |
| FR2574744A1 (en) | Device making it possible to drive the front wheel of two- or three-wheeled land vehicles with or without an engine | |
| US20060066073A1 (en) | Pedal drive | |
| US10683058B2 (en) | Bicycle drive train | |
| EP1225124A1 (en) | Propelling scooter | |
| FR2935310A1 (en) | Four wheels driving device i.e. mechanical transmission, for e.g. ground clearing vehicle, has frame parts receiving wheel shaft and articulating along axle, where pivoting axis of each part coincide with vertical axle or found near axle | |
| JP2794869B2 (en) | Front wheel drive system for front and rear wheel drive motorcycles | |
| RU93052938A (en) | FULLY-DRIVE SINGLE-VOLTAGE VEHICLE | |
| JPS6136079A (en) | Differential gear for front and rear wheel driving type motor tricycle | |
| KR890003864Y1 (en) | Forward wheel driving vehicle having three wheels | |
| SU958204A2 (en) | Bicycle pedal drive carriage unit | |
| JPS6316899Y2 (en) | ||
| JP2958998B2 (en) | Front wheel drive system for front and rear wheel drive motorcycles |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |