CN107434007B - Usage mode switching mechanism of bicycle derailleur - Google Patents
Usage mode switching mechanism of bicycle derailleur Download PDFInfo
- Publication number
- CN107434007B CN107434007B CN201610352209.3A CN201610352209A CN107434007B CN 107434007 B CN107434007 B CN 107434007B CN 201610352209 A CN201610352209 A CN 201610352209A CN 107434007 B CN107434007 B CN 107434007B
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- CN
- China
- Prior art keywords
- positioning
- ratchet wheel
- switching mechanism
- mode switching
- bicycle derailleur
- 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.)
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- 230000007246 mechanism Effects 0.000 title claims abstract description 19
- 230000009471 action Effects 0.000 abstract description 7
- 230000006872 improvement Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000008261 resistance mechanism Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Images
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
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- 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
- B62M9/121—Rear derailleurs
- B62M9/126—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
- B62M9/136—Chain guides; Mounting thereof
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Transmission Devices (AREA)
- Devices For Conveying Motion By Means Of Endless Flexible Members (AREA)
Abstract
The invention relates to a using mode switching mechanism of a bicycle derailleur, which comprises a body, a shifting lever and a shifting lever, wherein the top surface of the body is provided with an accommodating groove and is pivoted on a rotating shaft, so that the rotating shaft protrudes out of the bottom of the accommodating groove; the positioning assembly is provided with a ratchet wheel, at least one positioning pawl and at least one elastic piece, wherein the ratchet wheel is pivoted in the accommodating groove and synchronously rotates with the rotating shaft; an outer cover covering the body; a switch assembly including a bracket positioned between the cover and the positioning assembly and a control member slidably disposed between the bracket and the positioning assembly and protruding with at least one stopper disposed at an interval to approach or depart from an action path of the positioning pawl; wherein, the ratchet wheel is provided with a plurality of annular ratchets which are arranged at equal intervals, and each positioning pawl is provided with a meshing tooth meshed on any one ratchet. The invention enables a user to quickly switch the mode of use of the chain guide.
Description
Technical Field
The present invention relates to a bicycle derailleur, and more particularly, to a use mode switching mechanism for a bicycle derailleur that can switch a chain guide.
Background
A conventional derailleur for a bicycle, as disclosed in taiwan patent No. M481882, is mainly composed of a base fixed to a frame of the bicycle, a link mechanism connected to the base for driving the chain guide to swing with respect to the base, and a chain guide, wherein a swing axis direction of the chain guide intersects with a traveling direction of the bicycle, so that a chain of the bicycle can be guided to sprockets having different numbers of teeth, thereby achieving a speed change effect and providing a proper tension to the chain to ensure smooth operation.
In order to stabilize the chain for the purpose of achieving accurate shifting, it is common to add a one-way resistance mechanism to the chain guide, however, this mechanism does not have associated switching means, and therefore is inconvenient to use, and in U.S. patent publication No. 8,870,692, there is disclosed a bicycle derailleur, which is provided with a control lever on the link mechanism, and which applies different resistances to the rotation of the chain guide by switching the control lever between a first position and a second position, even though the control lever does not have a function of allowing the link mechanism to rotate bi-directionally relative to the chain guide, and there is still room for improvement.
Disclosure of Invention
In view of the above, it is an object of the present invention to provide a use mode switching mechanism for a bicycle derailleur that allows a user to quickly switch the use mode of the chain guide.
In order to achieve the purpose, the invention adopts the following technical scheme: a using mode switching mechanism of a bicycle derailleur is characterized by comprising a body, a shifting rod and a shifting rod, wherein the top surface of the body is provided with an accommodating groove and is pivoted on a rotating shaft, so that the rotating shaft protrudes out of the bottom of the accommodating groove; the positioning assembly is provided with a ratchet wheel, at least one positioning pawl and at least one elastic piece, wherein the ratchet wheel is pivoted in the accommodating groove and synchronously rotates with the rotating shaft, the positioning pawl is adjacent to the ratchet wheel and can be relatively close to or far away from the ratchet wheel, and the elastic piece is used for applying elastic force to the ratchet wheel to the positioning pawl; an outer cover covering the body; a switch assembly including a bracket and a control member, wherein the bracket is positioned between the outer cover and the positioning assembly, the control member is slidably disposed between the bracket and the positioning assembly, and at least one stopper is protruded at a distance to approach or depart from an action path of the positioning pawl; the ratchet wheel is provided with a plurality of annular ratchet teeth which are arranged at equal intervals, and each positioning pawl is provided with an engaging tooth which is engaged on any one ratchet tooth.
Preferably, the ratchet mechanism further comprises a pressing component arranged between the body and the outer cover to apply resistance to the ratchet.
Preferably, the plurality of ratchet teeth are arranged on the circumferential surface of the ratchet wheel at intervals, the positioning assembly further comprises a holder which is locked on the body and is adjacent to the ratchet wheel, the plurality of positioning pawls are slidably arranged in at least one accommodating hole of the holder, and each elastic element is arranged in any accommodating hole.
Preferably, the positioning assembly further has a fixing plate fixed on the holder and covering all the receiving holes, and the elastic member abuts against between the positioning pawl and the holder at both ends thereof.
Preferably, the bracket is positioned between the outer cover and the fixing plate, and the control member is slidably disposed between the bracket and the fixing plate.
Preferably, the bracket is provided with a groove, the control part comprises a rod body and a plate body, the rod body penetrates through the groove and the outer cover, and the stop block is formed by protruding extension of the plate body.
Preferably, one end of the rod body protruding out of the outer cover is connected with a toggle key.
Therefore, the user can adjust the position of the control piece to enable the stop block of the control piece to be far away from the action path of the positioning pawls, so that the positioning pawls can move freely to play the function normally, or the stop block of the control piece is positioned on the action path of the positioning pawls, so that the positioning pawls are limited in the containing holes, and the chain guide can rotate bidirectionally relative to the body.
Drawings
FIG. 1 is a perspective view of a bicycle derailleur clutch unit in a preferred embodiment of the present invention;
FIG. 2 is an exploded view of the bicycle derailleur clutch unit in the preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line 3-3 of FIG. 1;
FIG. 4 is a sectional top view of the ratchet and positioning ratchet of the preferred embodiment of the present invention;
FIG. 5 is an exploded view of the switch assembly and positioning ratchet in the preferred embodiment of the present invention.
Detailed Description
The invention is described in detail below with reference to the figures and examples.
As shown in fig. 1 to 3, a clutch unit 1 of a bicycle derailleur according to a preferred embodiment of the present invention is disposed between a chain guide 2 and a linkage mechanism (not shown), the clutch unit 1 includes a body 10, a positioning assembly 20, a pressing assembly 30 and a cover 40 covering the body 10 to enclose the positioning assembly 20 and the pressing assembly 30 in an inner space between the body 10 and the cover 40.
The body 10 is hollow and has a receiving slot 11 on a side away from the chain guide 2, so that the rotating shaft 2a of the chain guide 2 can penetrate through the body 10 and protrude out of the center of the bottom of the receiving slot 11. Thus, the bodies 10 are pivotally connected to the chain guide 2 to be rotatable with respect to each other. In addition, the following description will be given with the protruding direction of the rotating shaft 2a protruding from the accommodating groove 11 as the upper side.
The positioning assembly 20 has a ratchet wheel 21, the ratchet wheel 21 is pivoted in the containing groove 11 by taking the rotating shaft 2a as the center and rotates synchronously with the rotating shaft 2a, and a plurality of annular ratchet teeth 21a arranged at equal intervals are arranged on the circumferential surface of the ratchet wheel 21; two sides of a retainer 22 are locked on the body 10 and are adjacent to the circumferential surface of the ratchet 21; at least one positioning pawl 24 (four in the present embodiment) is linearly slidably disposed in at least one receiving hole 23 (four in the present embodiment) of the holder 22, and one end of each positioning pawl 24 relatively close to the ratchet wheel 21 is provided with an engaging tooth 24a for engaging with the ratchet teeth 21a of the ratchet wheel 21; a fixing piece 25 locked above the holder 22 to cover all the receiving holes 23; and at least one elastic member 26, which is a compression spring in this embodiment and is four in number, and each of which is abutted between the positioning pawl 24 and the holder 22 at both ends thereof to apply an elastic force to the ratchet 21 to position the pawl 24. In addition, each ratchet 21a is formed by an inclined surface and an upright stopper surface, so that the ratchet 21 can only rotate in one direction under the action of the positioning pawl 24 engaged with the ratchet 21 a. It should be noted that the number of the positioning pawls 24, the receiving holes 23 and the resilient members 26 need only be one, and need not be multiple, to achieve the actuation function of the bicycle derailleur.
As shown in fig. 4, in the present embodiment, 24 ratchet teeth 21a are provided on the circumferential surface of the ratchet 21, so that the angle θ between each ratchet tooth 21a and the center of the ratchet 21 is 15 degrees. In order to improve the accuracy, the positioning pawls 24, the accommodating holes 23 and the elastic members 26 need to be provided in plural numbers, in this embodiment, the included angles θ 1, θ 2 and θ 3 between the engaging teeth 24a of two adjacent positioning pawls 24 and the center of the ratchet 21 (i.e., the center of the rotating shaft 2 a) are respectively set to θ 1= θ 2= θ 3=33.75 degrees (i.e., 360/24 × 2+ (360/24)/4, where N = 2) and the same angular interval is arranged. Based on the setting position of the positioning pawl, the rotation precision of the positioning component 20 can be improved from the original 15 degrees to 3.75 degrees, namely improved by 4 times.
In other words, assuming that the top surface of the ratchet 21 is provided with X ratchet teeth 21a, in the case of having Y positioning pawls 24 (where X is a positive integer greater than 2 and Y is a positive integer greater than or equal to 2), if the positioning pawls 24 are arranged at equal angular intervals, the precision of rotation of the positioning assembly 20 is only Δ =360/X degrees; if the positioning pawls 24 are arranged at equal angular intervals according to the above formula, that is, the included angle between two adjacent positioning pawls 24 and the center of the ratchet 21 is set to Δ × N plus (Δ/Y), the rotational accuracy of the positioning assembly 20 is increased to Δ/Y, and a large increase can be obtained.
Specifically, the positioning pawls do not mesh with the ratchet teeth of the ratchet wheel at the same time, and in the present embodiment, the positioning pawls 24 mesh with the ratchet teeth of the ratchet wheel 21 in turn, so that only one of the engaging teeth 24a of one positioning ratchet 24 meshes with one ratchet tooth 21a of the ratchet wheel 21 at a time, and when the ratchet wheel rotates again by (360/X)/Y degrees, another engaging tooth 24a of the other positioning pawl 24 meshes with another ratchet tooth 21a of the ratchet wheel 21, that is, the rotation accuracy of the rotating shaft 2a is indeed improved to (360/X)/Y degrees. If necessary, one skilled in the art may also make minor adjustments to θ 1, θ 2, and θ 3 such that θ 1 ≠ θ 2 ≠ θ 3, which will result in varying degrees of accuracy.
As shown in fig. 1 and 2, the pressing assembly 30 includes a washer set 31 for clamping the ratchet 21, a pair of plate-shaped resilient pieces 32, a collar 33 sleeved on the rotating shaft 2a, and an adjusting bolt 34 locked in the threaded hole 2b on the top surface of the rotating shaft 2 a. The two ends of the plate-shaped resilient plate 32 abut against the top surface of the shim group 31 and the bottom surface of the collar 33, so that a user can rotate the screw depth of the adjusting bolt 34 to move the collar 33 upward or downward, thereby changing the downward pressure exerted by the plate-shaped resilient plate 32 on the shim 31 to adjust the resistance exerted by the positioning assembly 20 on the rotating shaft 2a and the chain guide 2.
Therefore, since the positioning pawls 24 are arranged at the calculated equal angles in an interval arrangement, the rotation accuracy of the chain guide 2 can be easily improved with the same number of parts. In addition, the ratchet teeth of the ratchet wheel can also be arranged on the circumferential surface of the ratchet wheel, and the positioning pawls can still be arranged at equal angular intervals to improve the accuracy.
It should be noted that, as shown in fig. 2, 4 and 5, the clutch unit 1 is further provided with a switch assembly 50, which includes a bracket 51 and a control member 52, wherein the bracket 51 is positioned between the outer cover 40 and the fixing plate 25 and is provided with a groove 51a, the control member 52 is formed by integrally forming a plate body 53 and a rod body 54, the plate body 52 is slidably disposed between the bracket 51 and the fixing plate 25 and downwardly protrudes with four stoppers 55 (as shown in fig. 5); the lever 54 is upwardly passed through the slot 51a and the opening 41 in the cover 40 so that one end of the lever 54 can be connected to a toggle key 60. Therefore, the user can push the toggle button 60 by hand to move the control member 52 along the slot 51a, when the control member 52 is located at one end of the slot 51a, the stopper 55 will not be located on the action path of the positioning pawls 24, so that the positioning pawls 24 can freely move to function normally (as shown in fig. 4), but when the control member 52 is located at the other end of the slot 51a, the stopper 55 will be located on the action path of the positioning pawls 24 to block the positioning pawls 24 from being confined in the accommodating holes 23, and the chain guide 2 will be capable of rotating bidirectionally relative to the body 10. It should be noted that the number of the stoppers 55 can be adjusted according to the number of the positioning pawls 24, for example, when the number of the positioning pawls 24 is one, the number of the stoppers 55 only needs to be one, and the function of switching the actuating manner can be realized.
The above embodiments are only for illustrating the present invention, and the structure, size, arrangement position and shape of each component can be changed, and on the basis of the technical solution of the present invention, any improvement and equivalent transformation of the individual components according to the principle of the present invention should not be excluded from the protection scope of the present invention.
Claims (7)
1. A usage mode switching mechanism for a bicycle derailleur, comprising:
the top surface of the body is provided with an accommodating groove and is pivoted on a rotating shaft, so that the rotating shaft protrudes out of the bottom of the accommodating groove;
the positioning assembly is provided with a ratchet wheel, at least one positioning pawl and at least one elastic piece, wherein the ratchet wheel is pivoted in the accommodating groove and synchronously rotates with the rotating shaft, the positioning pawl is adjacent to the ratchet wheel and can be relatively close to or far away from the ratchet wheel, and the elastic piece is used for applying elastic force to the ratchet wheel to the positioning pawl;
an outer cover covering the body;
a switch assembly including a bracket positioned between the cover and the positioning assembly and a control member slidably disposed between the bracket and the positioning assembly and projecting at least one stop spaced to approach or move away from the path of movement of the positioning pawl;
the ratchet wheel is provided with a plurality of annular ratchets which are arranged at equal intervals, and each positioning pawl is provided with an engaging tooth which is engaged on any one ratchet.
2. The use mode switching mechanism of a bicycle derailleur according to claim 1, wherein: the ratchet wheel further comprises a pressurizing assembly arranged between the body and the outer cover so as to apply resistance to the ratchet wheel.
3. The use mode switching mechanism of a bicycle derailleur according to claim 2, wherein: the positioning assembly is provided with a retainer which is locked on the body and is adjacent to the ratchet wheel, the positioning pawls are arranged in at least one accommodating hole of the retainer in a sliding manner, and each elastic piece is arranged in any accommodating hole.
4. The use mode switching mechanism of a bicycle derailleur according to claim 3, wherein: the positioning component is also provided with a fixing plate which is fixedly locked on the retainer and covers all the accommodating holes, and two ends of the elastic component are propped against between the positioning pawl and the retainer.
5. The use mode switching mechanism of a bicycle derailleur according to claim 4, wherein: the bracket is positioned between the outer cover and the fixing piece, and the control piece is slidably arranged between the bracket and the fixing piece.
6. The use mode switching mechanism of a bicycle derailleur according to claim 1, wherein: the support is provided with a groove, the control piece is composed of a rod body and a plate body, the rod body penetrates through the groove and the outer cover, and the stop block is formed by protruding extension of the plate body.
7. The use mode switching mechanism of a bicycle derailleur according to claim 6, wherein: one end of the rod body, which protrudes out of the outer cover, is connected with a toggle key.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610352209.3A CN107434007B (en) | 2016-05-25 | 2016-05-25 | Usage mode switching mechanism of bicycle derailleur |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610352209.3A CN107434007B (en) | 2016-05-25 | 2016-05-25 | Usage mode switching mechanism of bicycle derailleur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107434007A CN107434007A (en) | 2017-12-05 |
| CN107434007B true CN107434007B (en) | 2022-10-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610352209.3A Active CN107434007B (en) | 2016-05-25 | 2016-05-25 | Usage mode switching mechanism of bicycle derailleur |
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| Country | Link |
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| CN (1) | CN107434007B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112478041B (en) * | 2019-09-11 | 2022-06-03 | 台湾微转股份有限公司 | Bicycle chain puller |
| CN112158293B (en) * | 2020-09-11 | 2021-11-16 | 惠州市元胜自行车配件有限公司 | Rear speed-changing guide wheel position adjusting tool |
| CN113247169B (en) * | 2021-06-11 | 2022-09-30 | 天津美派电动科技有限公司 | Switch type chain wheel driving mechanism |
| US11834131B1 (en) * | 2022-06-14 | 2023-12-05 | Ad-Ii Engineering Inc. | Rear derailleur |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6015516B2 (en) * | 1979-12-19 | 1985-04-19 | 株式会社シマノ | bicycle derailleur |
| JPH0752865A (en) * | 1993-06-10 | 1995-02-28 | Nobuo Ozaki | Derailer for bicycle and speed change system for bicycle employing the derailer |
| US6584875B1 (en) * | 2002-07-09 | 2003-07-01 | Jackson Deng | Ratchet wrench |
| DE102007040156B4 (en) * | 2007-08-24 | 2013-08-29 | Shimano Inc. | Rear bicycle derailleur |
| US8852041B2 (en) * | 2010-09-30 | 2014-10-07 | Shimano, Inc. | Bicycle derailleur with rotation resistance |
| US9475547B2 (en) * | 2012-02-06 | 2016-10-25 | Brian Jordan | Derailleur with damping assembly |
| CN205769961U (en) * | 2016-05-25 | 2016-12-07 | 台湾微转股份有限公司 | The use pattern switching mechanism of bicycle chain puller |
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2016
- 2016-05-25 CN CN201610352209.3A patent/CN107434007B/en active Active
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| CN107434007A (en) | 2017-12-05 |
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