WO2004048189A1 - 自転車用変速装置 - Google Patents
自転車用変速装置 Download PDFInfo
- Publication number
- WO2004048189A1 WO2004048189A1 PCT/JP2002/012333 JP0212333W WO2004048189A1 WO 2004048189 A1 WO2004048189 A1 WO 2004048189A1 JP 0212333 W JP0212333 W JP 0212333W WO 2004048189 A1 WO2004048189 A1 WO 2004048189A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- guard
- diameter gear
- bicycle
- gear
- auxiliary
- Prior art date
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
- 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
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/131—Front derailleurs
- B62M9/136—Chain guides; Mounting thereof
-
- 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
- B62M9/06—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like
- B62M9/10—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like
- B62M9/12—Transmissions characterised by use of an endless chain, belt, or the like of changeable ratio using a single chain, belt, or the like involving different-sized wheels, e.g. rear sprocket chain wheels selectively engaged by the chain, belt, or the like the chain, belt, or the like being laterally shiftable, e.g. using a rear derailleur
- B62M9/131—Front derailleurs
- B62M9/134—Mechanisms for shifting laterally
- B62M9/1342—Mechanisms for shifting laterally characterised by the linkage mechanisms
Definitions
- the present invention relates to a transmission for a bicycle, and more particularly to a transmission for a bicycle that changes a chain in the width direction of a bicycle in a front chain wheel provided with two or more gear plates.
- a bicycle transmission has a gear for shifting a chain through a link mechanism and a front chain wheel in which small diameter gears, medium diameter gears and large diameter gears having different numbers of teeth are arranged side by side in the lateral direction. It is widely known.
- the bicycle transmission Moves from the small diameter gear side to the large diameter gear side, whereby the chain can be changed from the small diameter gear to the medium diameter gear and the large diameter gear.
- the transmission lever is loosened by operating the shift lever, the bicycle transmission returns from the large diameter gear to the small diameter gear by the force of the return panel provided on the bicycle transmission.
- the chain can be changed from a large diameter gear to a medium diameter gear and a small diameter gear.
- the inner guard of the bicycle transmission is fronted. It needs to extend to the axial center of the chain wheel.
- the inner guard is extended, when shifting from a medium diameter gear to a large diameter gear, the chain is sandwiched between the inner guard and the large diameter gear, and the shift performance is degraded.
- Various inner guard shapes have been proposed to solve such problems, but none of them has achieved satisfactory shift performance.
- the gap between the inner guard and the small diameter gear tooth tip is large.
- the chain may jump over the small gear and drop inward in the bicycle wheel width direction.
- the inner guard is the same as above.
- the present invention has been made in view of the above-described circumstances, and by forming a guard with two types of guards, a main guard and an auxiliary guard, a front having three or more gears arranged side by side. It is a first object of the present invention to improve shift performance from a small diameter gear to a medium diameter gear and at the same time improve shift performance from a medium diameter gear to a large diameter gear in a chain wheel. Furthermore, when the present invention is used with a front chain wheel provided with two gears, when shifting from a large diameter gear to a small diameter gear while securing the transmission performance from the small diameter gear to the large diameter gear, The second purpose is to prevent the chain from falling off to the small diameter gear side.
- the guard for the bicycle transmission is configured with two types of guards, a main guard and an auxiliary guard, and the auxiliary guard is located radially downward to the shaft center of the front chain wheel with respect to the main guard.
- the elastically displaceable mounting allows the auxiliary guard to push the chain and shift the speed when shifting from a small diameter gear to a medium diameter gear in a front chain wheel in which three gears are arranged side by side.
- the auxiliary guard presses the chain toward the large diameter gear as in the conventional product, but the auxiliary guard is attached to the main guard so that it can be freely displaced. If the pressure exceeds a certain level, it will escape to the opposite side of the large diameter gear. Displace to avoid.
- the chain can be smoothly shifted to the large diameter gear without inserting the chain between the guard and the large diameter gear.
- the auxiliary guard is displaced when shifting from a small diameter gear to a large diameter gear.
- the same speed change performance as a bicycle speed changer for the front chain wheel arranged in parallel in the direction is obtained, and the gap between the inner guard and the small diameter gear tip can be made smaller when changing from a large diameter gear to a small diameter gear. It is possible to solve the problem that the chain jumps over a small diameter gear and easily falls inward in the width direction of the rotating vehicle.
- FIG. 1 is a front view of a bicycle transmission according to an embodiment of the present invention
- FIG. 2 is a side view of a bicycle transmission according to an embodiment of the present invention
- FIG. FIG. 6 is an operation explanatory view when combined with a front chain wheel provided with a gear plate of FIG.
- Fig. 4 is an illustration of operation when the conventional product is combined with a front chain wheel equipped with three gear plates
- Fig. 5 is a combination of the conventional product with a front chain wheel equipped with three gear plates. It is explanatory drawing of a case.
- FIG. 6 is a view showing a second embodiment of the present invention
- FIG. 7 is a view showing a third embodiment of the present invention.
- the transmission 1 for a bicycle according to the present invention is pivotably connected via a frame 3 and a pand 4 fixed to a seat pipe 2 as shown in FIGS. 1 and 2, and a shaft 9 and a pin 10 on the frame.
- the main guard 7, which is pivotably attached via the pins 1 2 and 1 1 to the links 6 and 5 and 5 and 6, is composed of an auxiliary guard 8 fixed by the pins 1 9 to the main guard
- the guard M is configured to be movable in parallel.
- a return spring 17 is built in the inside of the link 6, and the guard M is biased by the return spring 17 on the side of the vehicle in the width direction (the direction of the arrow Q).
- a wire connection 16 for connecting a wire 18 extending from the shift lever S to the link 6 is constituted by a port 13, a nut 14 and a washer 15, and by pulling the shift lever S
- the guard M moves outward in the width direction of the bicycle (arrow P direction), and when the shift lever is returned, the guard M moves in the arrow Q direction due to the return force of the return spring.
- the auxiliary guard is formed of an elastically deformable material, and is fixed to the main guard at the back of the seat pipe from the center of the seat pipe by a pin 19.
- the guard M has a small diameter gear as shown in FIG. It is located above C.
- the main guard 20 and the auxiliary guard 21 are formed of a rigid body.
- the auxiliary guard may be attached to the main guard at least on the inner side in the width direction of the vehicle (arrow W direction) via the plate spring 23 by means of the pin 22 so as to be displaceable.
- the guard R may be formed of an elastic body, and the main guard portion R a and the auxiliary guard portion R b may be provided so that the auxiliary guard portion is elastically displaced. And the auxiliary guard portion may be provided so that the auxiliary guard portion is elastically displaced by an external force.
- the present invention largely solves the drawbacks of the conventional front bicycle transmission and significantly improves the transmission performance.
- the shift performance from the medium diameter gear to the large diameter gear is on the contrary, if it is intended to improve the shift performance from the medium diameter gear to the large diameter gear, there is a disadvantage that the shift performance from the small diameter gear to the medium diameter gear is degraded.
- the guard of the bicycle transmission is composed of two pieces of the main guard and the auxiliary guard, and the auxiliary guard is resilient to the main guard in the radial direction lower position of the main guard with respect to the axial center of the front chain wheel.
- the auxiliary guard presses and changes the speed of the chain when changing gears from small monster gears to medium diameter gears by being mounted displaceably on the gear, the same speed change performance as conventional products can be obtained.
- the auxiliary guard is displaced so as to escape to the opposite side to the large diameter gear.
- the chain can be smoothly shifted to the large diameter gear without interposing the chain between the guard and the large diameter gear.
- the inner guard does not extend as far in the axial center of the front chain wheel in conventional bicycle transmissions, When shifting from a large diameter gear to a small diameter gear, the chain may jump over the small diameter gear and drop off, but in the present invention, the guard located at the lower side in the radial direction is extended largely toward the axial center of the front chain wheel. As a result, it is possible to prevent the chain from falling off.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmissions By Endless Flexible Members (AREA)
- Gears, Cams (AREA)
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN02829925.6A CN1694831A (zh) | 2002-11-26 | 2002-11-26 | 自行车用变速装置 |
US10/535,343 US20060148602A1 (en) | 2002-11-26 | 2002-11-26 | Transmission for bicycle |
PCT/JP2002/012333 WO2004048189A1 (ja) | 2002-11-26 | 2002-11-26 | 自転車用変速装置 |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/JP2002/012333 WO2004048189A1 (ja) | 2002-11-26 | 2002-11-26 | 自転車用変速装置 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004048189A1 true WO2004048189A1 (ja) | 2004-06-10 |
Family
ID=32375608
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/012333 WO2004048189A1 (ja) | 2002-11-26 | 2002-11-26 | 自転車用変速装置 |
Country Status (3)
Country | Link |
---|---|
US (1) | US20060148602A1 (ja) |
CN (1) | CN1694831A (ja) |
WO (1) | WO2004048189A1 (ja) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4191757B2 (ja) * | 2006-10-12 | 2008-12-03 | 株式会社シマノ | 自転車用変速制御装置 |
US20090111624A1 (en) * | 2007-10-31 | 2009-04-30 | Douglas Chiang | Front speed change device |
CN101767626B (zh) * | 2008-12-29 | 2012-12-12 | 荣技研股份有限公司 | 自行车用前变速器 |
US8337343B2 (en) * | 2010-03-06 | 2012-12-25 | Chang Hui Lin | Front derailleur of bicycle |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60219187A (ja) * | 1984-04-16 | 1985-11-01 | 株式会社シマノ | 自転車用フロントデイレ−ラ− |
JPH06305475A (ja) * | 1993-04-21 | 1994-11-01 | Shimano Inc | 自転車用フロントディレーラ |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5383246A (en) * | 1976-12-28 | 1978-07-22 | Shimano Industrial Co | Derailer for bicycle |
US4237743A (en) * | 1977-10-11 | 1980-12-09 | Shimano Industrial Company, Limited | Front derailleur for a bicycle |
JPS59184078A (ja) * | 1983-04-01 | 1984-10-19 | 株式会社シマノ | 自転車用フロントデイレ−ラ− |
JPS6030892U (ja) * | 1983-08-08 | 1985-03-02 | 株式会社シマノ | 自転車用変速操作装置 |
JPS60206793A (ja) * | 1984-03-29 | 1985-10-18 | 株式会社シマノ | 3段変速用フロントデイレ−ラ− |
JP3458016B2 (ja) * | 1994-12-20 | 2003-10-20 | 株式会社シマノ | 自転車用フロントディレーラ |
-
2002
- 2002-11-26 WO PCT/JP2002/012333 patent/WO2004048189A1/ja active Application Filing
- 2002-11-26 US US10/535,343 patent/US20060148602A1/en not_active Abandoned
- 2002-11-26 CN CN02829925.6A patent/CN1694831A/zh active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60219187A (ja) * | 1984-04-16 | 1985-11-01 | 株式会社シマノ | 自転車用フロントデイレ−ラ− |
JPH06305475A (ja) * | 1993-04-21 | 1994-11-01 | Shimano Inc | 自転車用フロントディレーラ |
Also Published As
Publication number | Publication date |
---|---|
CN1694831A (zh) | 2005-11-09 |
US20060148602A1 (en) | 2006-07-06 |
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