CN113247170A - Two-gear speed-changing chainless transmission shaft of bicycle - Google Patents
Two-gear speed-changing chainless transmission shaft of bicycle Download PDFInfo
- Publication number
- CN113247170A CN113247170A CN202110609416.3A CN202110609416A CN113247170A CN 113247170 A CN113247170 A CN 113247170A CN 202110609416 A CN202110609416 A CN 202110609416A CN 113247170 A CN113247170 A CN 113247170A
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- bevel gear
- spiral bevel
- gear
- shaft
- bicycle
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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
- B62M11/00—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels
- B62M11/04—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio
- B62M11/14—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears
- B62M11/18—Transmissions characterised by the use of interengaging toothed wheels or frictionally-engaging wheels of changeable ratio with planetary gears with a plurality of planetary gear units
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Structure Of Transmissions (AREA)
- Transmission Devices (AREA)
Abstract
The invention provides a two-gear speed-changing chainless transmission shaft of a bicycle, which comprises a middle shaft shell, a middle shaft cover, a front main spiral bevel gear, a front auxiliary spiral bevel gear, a crank rotating shaft, a planet carrier mechanism, an inner gear ring mechanism, a guide sleeve, a limiting sleeve, a gear shifting fork, a transmission shaft shell assembly, a transmission mandrel, a rear main spiral bevel gear mechanism, a rear auxiliary spiral bevel gear, a transmission shaft cover, a ratchet mechanism and the like. The intelligent bicycle speed change mechanism is simple in structure and convenient to use, the shifting lever is utilized to switch gears, the requirement on flat ground riding speed can be met, the requirement on uphill speed reduction and torque increase can be met, the traditional inner speed change mechanism is generally arranged inside the rear hub, the rear hub can only be used as a speed change mechanism, the function of the rear hub is changing along with the gradual development of bicycle technology and requirements, the novel intelligent bicycle lock and the power generation mechanism are required to be installed inside the rear hub, the speed change mechanism cannot be installed on the rear hub, the speed change chainless transmission shaft well solves the problem, and the bicycle is more diversified in application.
Description
Technical Field
The invention relates to a bicycle transmission shaft, in particular to a bicycle two-gear speed change chainless transmission shaft.
Background
At present, the traditional chainless bicycle is generally a fixed-speed chainless transmission shaft with an internal speed-changing hub and an external horseshoe lock, and the configuration causes the rear hub to be only used as a speed-changing mechanism. With the increasing development of bicycle technology and requirements, the functions of the rear hub are changing, and the novel bicycle intelligent lock and the power generation mechanism are required to be installed inside the rear hub, so that the rear hub cannot be provided with a speed change mechanism. The traditional chainless constant-speed transmission shaft generally has an overall transmission ratio of about 2:1, and is good in riding speed and experience when riding on flat ground, but is laborious to ride when starting and climbing. If the rear hub is not provided with the speed change mechanism, the requirements of flat riding speed and uphill speed reduction and torque increase cannot be met, and the riding experience of the bicycle is reduced.
Disclosure of Invention
To solve the above problems, the present invention provides a two-speed transmission chainless transmission shaft assembly for a bicycle that provides an overall chainless transmission shaft assembly with larger shift arms.
In order to achieve the above object, the present invention provides a two-speed transmission chainless transmission for a bicycle, comprising a front transmission, a rear transmission and a transmission spindle connecting the front transmission and the rear transmission, wherein the front transmission comprises:
a bottom bracket shell;
the crank rotating shaft is arranged in the middle shaft shell;
the crank rotating shaft is fixed on the front main spiral bevel gear arranged in the middle shaft shell;
the front driven spiral bevel gear is arranged in the middle shaft shell and meshed with the front main spiral bevel gear, and the spiral bevel gear is arranged at one end of the transmission mandrel;
the planet carrier mechanism is fixed on the crank rotating shaft and comprises a planet carrier body and 4 planet wheels which are respectively meshed with the planet carrier body; and
a gear shifting fork is arranged on the front end of the main shaft,
and the rear transmission device comprises a rear main spiral bevel gear mechanism and a rear auxiliary spiral bevel gear meshed with the rear main spiral bevel gear mechanism, wherein the rear main spiral bevel gear mechanism is fixedly connected with the other end of the transmission mandrel.
Furthermore, the front main spiral bevel gear is installed on the crank rotating shaft through a bearing support, the planet carrier mechanism is installed on the crank rotating shaft through the bearing support and is meshed with the front main spiral bevel gear through a tail end cross key groove, the inner gear ring mechanism is installed inside the middle shaft shell through a guide sleeve and can move left and right through a gear shifting fork, the sun gear tooth is located in the middle of the crank rotating shaft, and the position of the inner gear ring is changed to achieve a speed change effect. The front driven spiral bevel gear is driven by the front main spiral bevel gear, the torque is transmitted to the rear main spiral bevel gear mechanism by the transmission mandrel, the ratchet mechanism is arranged in the rear main spiral bevel gear mechanism, and then the power is transmitted to the rear hub from the spiral bevel gear to drive the rear wheel to move.
Further, the sun gear tooth part and the crank rotating shaft of the transmission shaft are integrated and are power input components.
Furthermore, planet carrier mechanism comprises planet carrier body, 4 planet wheels, 4 stall round pins and 4 installation screws.
Further, the rear main spiral bevel gear mechanism is composed of a rear main spiral bevel gear, a ratchet wheel outer sleeve, a ball bearing, a clamp spring for a shaft, a positioning spacer bush, a ratchet wheel inner ring, a jack spring, a spacer bush, a clamp spring for a hole, a ball bearing and 4 jack pieces.
In a preferred embodiment of the invention, the output rotation speed of the front main spiral bevel gear is changed by changing the motion relationship of the internal gear ring mechanism and the middle shaft shell and the planet carrier mechanism.
In a preferred embodiment of the present invention, the ratchet mechanism is located at the end of the drive shaft and is mounted inside the rear main spiral bevel gear.
Therefore, the beneficial effects of the invention are as follows:
the invention has simple structure and convenient use, and can meet the requirements of flat ground riding speed and uphill speed reduction and torque increase by utilizing the shift lever to switch gears. The two-gear speed-changing chainless transmission shaft overcomes the defect that the traditional inner speed-changing mechanism is generally arranged in the rear hub, so that the rear hub can only be used as the speed-changing mechanism, and along with the increasing development of the technology and the requirement of the shared bicycle, the function of the rear hub is changing, and the novel intelligent lock and the power generation mechanism of the shared bicycle are required to be arranged in the rear hub, so that the rear hub cannot be provided with the speed-changing mechanism.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a cross-sectional view of the present invention;
FIG. 2 is a schematic view of a planet carrier mechanism;
FIG. 3 is a schematic view of a rear gear pair and a ratchet mechanism; and
fig. 4 is a schematic diagram of a gear shifting process.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
Referring to fig. 1 to 3, the two-gear speed change chainless transmission shaft device for a bicycle provided by the invention comprises a middle shaft shell 1, a middle shaft cover 2, a ball bearing 3, a front main spiral bevel gear 4, a framework oil seal 5, a crank rotating shaft 6, a hole snap spring 7, a ball bearing 8, a planet carrier mechanism 9, an inner gear ring mechanism 10, a ball bearing 12, a gear shift fork 13, a compression spring 14, a spring catch 15, a shaft snap spring 16, a locking screw 17, a guide sleeve 18, a limit sleeve 19, a rotation stop pin 20, a front slave spiral bevel gear 21, a ball bearing 22, a transmission shaft shell assembly 23, a transmission mandrel 24, a rear main spiral bevel gear mechanism 25, a transmission shaft cover 26, a rear slave spiral bevel gear 27 and the like.
The planet carrier mechanism 9 is composed of a planet carrier body 100, 4 planet wheels 101, 4 rotation stopping pins 102 and 4 mounting screws 103; the rear main spiral bevel gear mechanism 25 is composed of a rear main spiral bevel gear 200, a ratchet outer sleeve 201, a ball bearing 202, a shaft snap spring 203, a positioning spacer 204, a ratchet inner ring 205, a jack piece spring 206, a spacer 207, a hole snap spring 208, a ball bearing 209, 4 jack pieces 210 and the like.
Referring to fig. 1 to 3, the ball bearing 8 is mounted inside the front main spiral bevel gear 4 and fixed by the snap spring 7 through a hole, and the ball bearing 8 is mounted outside the front main spiral bevel gear 4 and fixed in the middle shaft housing 1 through the middle shaft cover 2 in a matching manner; framework oil seals 5 are arranged at the left end and the right end of a crank rotating shaft 6 and are matched with the middle shaft cover 2 and the middle shaft shell 1 to prevent external garbage from entering the transmission shaft; the left end of the crank rotating shaft 6 is also provided with a ball bearing 8 which is matched and installed with the middle shaft shell 1 to support the power input load of the whole transmission shaft; the limiting sleeve 19 is arranged inside the middle shaft shell 1 in an interference fit mode and is coaxially arranged with the guide sleeve 18, the left end of the limiting sleeve 19 is provided with a long groove, the gear shifting fork 13 penetrates through the long groove to be fixed on the guide sleeve 18, the bottom of the gear shifting fork 13 is clamped in a groove at the left end of the inner gear ring mechanism 10, and the inner gear ring mechanism 10 is driven to move left and right when the gear shifting fork 13 moves left and right; the 4 rotation stopping pins 20 are uniformly distributed on the outer diameter of the inner gear ring mechanism 10 in an interference fit manner, 4 spiral clamping grooves are formed in the right end of the limiting sleeve 19, the inner gear ring mechanism 10 is driven to move leftwards when the gear shifting fork 13 moves leftwards, and the 4 rotation stopping pins 20 on the outer diameter of the inner gear ring mechanism 10 are just clamped in the 4 spiral clamping grooves in the right end of the limiting sleeve 19, so that the inner gear ring mechanism 10 and the middle shaft shell 1 are connected into a whole and are kept in a static state; the compression spring 14 acts on the inner gear ring mechanism 10 through the spring stop piece 15 and the shaft clamp spring 16, so that the inner gear ring mechanism 10 tends to move to the right, 4 spiral clamping grooves are formed in the inner gear ring mechanism 10, at the moment, 4 rotation stopping pins 102 on the planet carrier mechanism 9 are just clamped in the spiral clamping grooves in the inner gear ring mechanism 10, and the inner gear ring mechanism 10 and the planet carrier mechanism 9 are kept consistent.
Referring to fig. 2, 4 planet gears 101 are uniformly arranged in a planet carrier body 100 through mounting screws 103, and 4 rotation stopping pins 102 are arranged on the planet carrier body 100 in a staggered manner by 45 degrees; the planet carrier mechanism 9 is coaxially arranged on the crank rotating shaft 6 through a ball bearing 12 and is limited by a shaft clamp spring 28; the cross-shaped groove is formed in the upper portion of the planet carrier body 100, the cross-shaped key is arranged on the front main spiral bevel gear 4, when the main spiral bevel gear 4 is installed in place, the cross-shaped key groove is just clamped in place, and torque on the planet carrier body 100 is transmitted to the front main spiral bevel gear 4;
referring to fig. 3, for convenience of processing, the rear main spiral bevel gear 200 and the ratchet outer sleeve 201 are separately processed and then welded into a whole by argon arc welding, the ball bearing 202 is mounted on the rear main spiral bevel gear 200 and fixed by a shaft through a snap spring 203, and the ball bearing 202 is mounted inside the lower end of the transmission shaft housing assembly 23; the ball bearing 209 is arranged in the rear main spiral bevel gear 200 and is fixed by a clamp spring 208 through a hole; the positioning spacer 204 and the spacer 207 are respectively arranged at the left side and the right side of the ratchet wheel inner ring 205 and are fixedly arranged through the transmission mandrel 24 and the locking screw 17; the 4 jack pieces 210 are fixed on the ratchet inner ring 205 through the jack piece spring 206, and the jack piece spring 206 enables the jack pieces 210 to be in an ejecting state. When riding in the forward direction, the power of the crank rotating shaft 6 is transmitted to the jack piece 210 through a transmission chain, and the jack piece 210 drives the ratchet wheel outer sleeve 201 and the rear main spiral bevel gear 200 to move; when riding in the reverse direction, the ratchet mechanism forces the bicycle to be in a clutch state.
Through the implementation of above-mentioned structure, this application adopts a bearing to support a drive disk assembly and makes the transmission shaft rotate more nimble, shifts more reliably.
Fig. 4 is a simplified view of the front main spiral bevel gear 4, the crank shaft 6 (sun gear), the ring gear mechanism 10, and the carrier body 100 being mounted. The reference circle radius of the inner gear ring mechanism 10 is r2, and the reference circle radius of the crank rotating shaft 6 (sun gear) is r 1; in the default state, compression spring 14 forces gear shift fork 13 to be located the right-hand member, 4 on the planet carrier mechanism 9 only block in ring gear mechanism 10 inside helical groove, 4 on the ring gear mechanism 10 external diameter only stop round pin 20 keep away from 19 right-hand members of stop collar 4 helical groove simultaneously, be in the separation state, the driving part is crank shaft 6 (sun gear) this moment, ring gear mechanism 10 and planet carrier body 100 link into an organic whole, this kind of mode is the constant velocity motion, the drive ratio is 1: 1, riding on the flat ground in the mode; when the gear shifting fork 13 is forced to be in the left position by external force, 4 rotation stopping pins 102 on the planet carrier mechanism 9 are separated from the internal spiral clamping grooves of the inner gear ring mechanism 10, and meanwhile, 4 rotation stopping pins 20 on the outer diameter of the inner gear ring mechanism 10 are just clamped at 4 spiral clamping grooves at the right end of the limiting sleeve 19, so that the inner gear ring mechanism 10 is forced to be in an forbidden state, at the moment, the driving part is a crank rotating shaft 6 (sun gear), the fixing part is the inner gear ring mechanism 10, the driven part is a planet carrier body 100, the mode is deceleration motion, and the transmission ratio is 1: 1+ r2/r1, and the riding mode adopts the mode of starting and climbing.
The invention is further characterized in that the transmission shaft device comprises a middle shaft shell, a middle shaft cover, a front main spiral bevel gear, a front slave spiral bevel gear, a crank rotating shaft, a planet carrier mechanism, an inner gear ring mechanism, a guide sleeve, a limit sleeve, a shifting fork, a transmission shaft shell assembly, a transmission mandrel, a rear main spiral bevel gear, a rear slave spiral bevel gear, a transmission shaft cover, a ratchet mechanism, a transmission shaft protecting cover and the like.
Furthermore, the front main spiral bevel gear is installed on the crank rotating shaft through a bearing support, the planet carrier mechanism is installed on the crank rotating shaft through the bearing support and is meshed with the front main spiral bevel gear through a tail end cross key groove, the inner gear ring mechanism is installed inside the middle shaft shell through a guide sleeve and can move left and right through a gear shifting fork, the sun gear tooth is located in the middle of the crank rotating shaft, and the position of the inner gear ring is changed to achieve a speed change effect. The front driven spiral bevel gear is driven by the front main spiral bevel gear, the torque is transmitted to the rear main spiral bevel gear mechanism by the transmission mandrel, the ratchet mechanism is arranged in the rear main spiral bevel gear mechanism, and then the power is transmitted to the rear hub from the spiral bevel gear to drive the rear wheel to move.
Further, the sun gear tooth part and the crank rotating shaft of the transmission shaft are integrated and are power input components.
Furthermore, the output rotating speed of the front main spiral bevel gear is changed by changing the motion relation of the inner gear ring mechanism, the middle shaft shell and the planet carrier mechanism.
Furthermore, the ratchet mechanism is positioned at the tail end of the transmission shaft and is arranged inside the rear main spiral bevel gear.
The foregoing shows and describes the general principles and broad features of the present invention and advantages thereof. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A two speed chainless drive axle assembly for a bicycle comprising a front drive, a rear drive and a drive spindle (24) connecting the front and rear drives, wherein the front drive comprises:
a bottom bracket shell (1);
a crank rotating shaft (6) arranged in the middle shaft shell (1);
is fixed on the crank rotating shaft (6) and the front main spiral bevel gear 4 arranged in the middle shaft shell (1),
a front driven spiral bevel gear (21) which is arranged in the middle shaft shell (1) and is meshed with the front main spiral bevel gear 4, wherein the spiral bevel gear (21) is arranged at one end of the transmission mandrel (24);
the planet carrier mechanism (9) is fixed on the crank rotating shaft (6), and the planet carrier mechanism (9) comprises a planet carrier body (100) and 4 planet wheels (101) which are respectively meshed with the planet carrier body (100); and
a gear shifting fork (13),
the rear transmission device comprises a rear main spiral bevel gear mechanism (25) and a rear auxiliary spiral bevel gear (27) meshed with the rear main spiral bevel gear mechanism (25), wherein the rear main spiral bevel gear mechanism (25) is fixedly connected with the other end of the transmission mandrel (24).
2. The two-gear speed change chainless transmission shaft device for the bicycle as claimed in claim 1, wherein the front main spiral bevel gear 4 is supported and mounted on the crank shaft (6) through a bearing (8), the planet carrier mechanism (9) is supported and mounted on the crank shaft (6) through a bearing (12) and is engaged with the front main spiral bevel gear 4 through a cross key slot at the tail end, the inner gear ring mechanism (25) is mounted inside the middle shaft housing (1) through a guide sleeve 18 and can move left and right through a gear shifting fork 13, the sun gear tooth part is located in the middle of the crank shaft (6), and the position of the inner gear ring 10 is changed to achieve a speed change effect. The front driven spiral bevel gear (21) is driven by the front main spiral bevel gear (4), torque is transmitted to the rear main spiral bevel gear mechanism (25) through the transmission mandrel (24), the ratchet mechanism is arranged in the rear main spiral bevel gear mechanism (25), and then power is transmitted to the rear hub from the spiral bevel gear (200) to drive the rear wheel to move.
3. The two speed chainless drive shaft assembly for a bicycle as set forth in claim 1, wherein said drive shaft sun gear cog and crank shaft are integral and power input members.
4. A bicycle two-speed chainless transmission shaft assembly according to claim 1, wherein said carrier mechanism (9) is comprised of a carrier body (100), 4 planet wheels (101), 4 anti-rotation pins (102) and 4 mounting screws (103).
5. The two-gear speed change chainless transmission shaft assembly for a bicycle as claimed in claim 1, wherein said rear main spiral bevel gear mechanism (25) is comprised of a rear main spiral bevel gear (200), a ratchet outer sleeve (201), a ball bearing (202), a shaft snap spring (203), a positioning spacer (204), a ratchet inner ring (205), a jack spring (206), a spacer (207), a hole snap spring (208), a ball bearing (209), and 4 jack pieces (210).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609416.3A CN113247170A (en) | 2021-06-01 | 2021-06-01 | Two-gear speed-changing chainless transmission shaft of bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110609416.3A CN113247170A (en) | 2021-06-01 | 2021-06-01 | Two-gear speed-changing chainless transmission shaft of bicycle |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN113247170A true CN113247170A (en) | 2021-08-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110609416.3A Pending CN113247170A (en) | 2021-06-01 | 2021-06-01 | Two-gear speed-changing chainless transmission shaft of bicycle |
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| CN (1) | CN113247170A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114148444A (en) * | 2021-10-29 | 2022-03-08 | 上海第二工业大学 | Three-gear speed-changing chainless transmission shaft of bicycle |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2319314Y (en) * | 1997-09-25 | 1999-05-19 | 梁朝斌 | Pedal speed variable planetary transmission device |
| CN201110353Y (en) * | 2007-11-08 | 2008-09-03 | 彪马集团浙江汽车研究院有限公司 | Helical teeth planet time-shelf mechanism |
| CN104500705A (en) * | 2014-11-24 | 2015-04-08 | 中国地质大学（武汉） | Sub-gearbox for planetary gear train of transmission |
| CN104806712A (en) * | 2015-04-29 | 2015-07-29 | 重庆通盛建设工业有限公司 | Input gear box and bicycle gear shifting speed control system with same |
| CN205113631U (en) * | 2015-11-13 | 2016-03-30 | 佛山市佳德兴自行车科技有限公司 | Bicycle axle driving device |
| CN106969103A (en) * | 2017-05-25 | 2017-07-21 | 李钢 | A kind of internal speed variator of bicycle and its arrangements for speed regulation |
-
2021
- 2021-06-01 CN CN202110609416.3A patent/CN113247170A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2319314Y (en) * | 1997-09-25 | 1999-05-19 | 梁朝斌 | Pedal speed variable planetary transmission device |
| CN201110353Y (en) * | 2007-11-08 | 2008-09-03 | 彪马集团浙江汽车研究院有限公司 | Helical teeth planet time-shelf mechanism |
| CN104500705A (en) * | 2014-11-24 | 2015-04-08 | 中国地质大学（武汉） | Sub-gearbox for planetary gear train of transmission |
| CN104806712A (en) * | 2015-04-29 | 2015-07-29 | 重庆通盛建设工业有限公司 | Input gear box and bicycle gear shifting speed control system with same |
| CN205113631U (en) * | 2015-11-13 | 2016-03-30 | 佛山市佳德兴自行车科技有限公司 | Bicycle axle driving device |
| CN106969103A (en) * | 2017-05-25 | 2017-07-21 | 李钢 | A kind of internal speed variator of bicycle and its arrangements for speed regulation |
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| Title |
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| 初级职业技术教育培训教材编审委员会: "《自行车装配与维修》", 30 November 1990 * |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114148444A (en) * | 2021-10-29 | 2022-03-08 | 上海第二工业大学 | Three-gear speed-changing chainless transmission shaft of bicycle |
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Application publication date: 20210813 |