CN114148444A - Three-gear speed-changing chainless transmission shaft of bicycle - Google Patents
Three-gear speed-changing chainless transmission shaft of bicycle Download PDFInfo
- Publication number
- CN114148444A CN114148444A CN202111269556.7A CN202111269556A CN114148444A CN 114148444 A CN114148444 A CN 114148444A CN 202111269556 A CN202111269556 A CN 202111269556A CN 114148444 A CN114148444 A CN 114148444A
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- transmission shaft
- spiral bevel
- gear
- bevel gear
- ball bearing
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Classifications
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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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- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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- Mechanical Engineering (AREA)
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Abstract
The invention relates to a bicycle three-gear speed change chainless transmission shaft, comprising: the device comprises a middle shaft shell, a middle shaft cover, a crank rotating shaft, a framework oil seal, a first ball bearing, a front main spiral bevel gear, a front auxiliary spiral bevel gear, a second ball bearing, a third ball bearing, a locking screw, a transmission shaft shell assembly, a transmission mandrel, a gear shifting fork, a driving sleeve, a guide sleeve, a return spring, an inner gear ring, a planet carrier mechanism, a rear main spiral bevel gear mechanism, a transmission shaft cover, a rear auxiliary spiral bevel gear, a sun gear mechanism and the like; 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.
Description
Technical Field
The invention relates to a transmission shaft, in particular to a three-gear speed-changing chainless transmission shaft of a bicycle, which utilizes a deflector rod to switch gears, can meet the requirements of riding speed on flat ground, speed reduction and torque increase on an uphill slope and accelerating riding.
Background
The traditional chainless bicycle is generally a fixed-speed chainless transmission shaft, an inner 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
In view of the above problems, the present invention provides a three-gear speed-changing chainless transmission shaft for a bicycle, which can switch gears by using a shift lever, can meet the requirements of riding on flat ground, speed reduction and torque increase on an uphill slope, and can also realize accelerating riding.
The invention solves the technical problems through the following technical scheme: a bicycle three speed chainless drive shaft, comprising:
the device comprises a middle shaft shell, a middle shaft cover, a crank rotating shaft, a framework oil seal, a first ball bearing, a front main spiral bevel gear, a front slave spiral bevel gear, a second ball bearing, a third ball bearing, a locking screw, a transmission shaft shell assembly, a transmission mandrel, a gear shifting fork, a driving sleeve, a guide sleeve, a return spring, an inner gear ring, a planet carrier mechanism, a rear main spiral bevel gear mechanism, a transmission shaft cover, a rear slave spiral bevel gear and a sun gear mechanism;
the front main spiral bevel gear is supported and installed in the middle shaft cover through a first ball bearing and is in spline connection with the right end of the crank rotating shaft, and the left end of the crank rotating shaft is fixed with the middle shaft shell through a third ball bearing; framework oil seals are arranged at the left end and the right end of the crank rotating shaft and are matched with the middle shaft cover and the middle shaft shell, so that external garbage is prevented from entering the transmission shaft; the front driven spiral bevel gear is supported and installed at the front end of the transmission shaft shell assembly through a second ball bearing, and the transmission mandrel is used for fixing the front driven spiral bevel gear and the rear main spiral bevel gear through a locking screw; the first ball bearing and the third ball bearing support the crank rotating shaft and bear the power input load of the whole transmission shaft; the inner gear ring is arranged in the middle of the rear end of the transmission shaft shell assembly in an interference manner; the left part of the rear end of the transmission shaft shell assembly is provided with an elongated slot, a guide sleeve is arranged on the outer diameter of a driving sleeve, a gear shifting fork penetrates through the elongated slot and is in threaded connection with the guide sleeve, the bottom of the gear shifting fork is clamped in a groove at the left end of the driving sleeve, the driving sleeve is driven to move left and right when the gear shifting fork moves left and right, and the guide sleeve and the driving sleeve can rotate mutually; the planet carrier mechanism is provided with four pawls and is supported and arranged at the left part of the rear end of the transmission shaft shell assembly through a bearing, the sun gear is provided with four sun gear pawls, the inner gear ring is arranged in the middle of the rear end of the transmission shaft shell assembly in an interference manner, the gear shifting fork forces the driving sleeve to move left and right, the reset spring forces the driving sleeve to be positioned at the left position when the driving sleeve is not influenced by external force, and the meshing relation of the driving sleeve, the planet carrier mechanism and the sun gear mechanism is changed to achieve the speed change effect; the front driven spiral bevel gear is driven by the front main spiral bevel gear, and then the torque is transmitted to the driving sleeve by the transmission mandrel.
In the specific implementation example of the invention, according to different speed requirements, the meshing of the driving sleeve and the planet carrier mechanism or the sun gear mechanism is changed, the torque is transmitted to the main spiral bevel gear mechanism through the pawl or the sun gear pawl, and then the power is transmitted from the spiral bevel gear to the rear hub to drive the rear wheel to move.
In an embodiment of the invention, the sun gear of the transmission shaft is a rotating part.
In the embodiment of the invention, the speed change effect is achieved by changing the meshing relation of the driving sleeve, the planet carrier mechanism and the sun gear mechanism.
The positive progress effects of the invention are as follows: the invention provides a bicycle three-gear speed change chainless transmission shaft which has the following advantages: the gear shifting device is simple in structure and convenient to use, and gears are switched by the shifting rod. Can satisfy the level land speed of riding requirement and satisfy the requirement of going up a slope speed reduction increase square, speed change mechanism generally sets up inside the flower-drum of back in the tradition, lead to the back flower-drum can only be speed change mechanism, along with the development increasingly of sharing bicycle technique and requirement, the function of back flower-drum is changing, novel sharing bicycle intelligence lock and generating mechanism have required to install inside the flower-drum of back, lead to the unable installation speed change mechanism of back flower-drum, this problem of fine solution of variable speed chainless transmission axle, make bicycle use more diversified.
Drawings
Fig. 1 is a cross-sectional view of the present invention.
FIG. 2-1 is a schematic diagram of a planet carrier mechanism.
FIG. 2-2 is a schematic sectional view A-A of FIG. 2-1.
Fig. 2-3 are schematic diagrams of the planet carrier mechanism.
FIG. 3-1 is a schematic view of the rear gear pair and the ratchet mechanism and the sun gear and the ratchet mechanism.
Fig. 3-2 is a schematic view of the main spiral bevel gear of fig. 3-1 with the rear portion removed.
Fig. 3-3 is a schematic cross-sectional view C-C of fig. 3-2.
Fig. 4-1 is a schematic diagram of the speed increase during the shifting process.
Fig. 4-2 is a schematic illustration of the constant speed during shifting.
Fig. 4-3 are schematic diagrams of deceleration during a shift.
The following are the names corresponding to the reference numbers in the invention:
the mechanism comprises a middle shaft shell 1, a middle shaft cover 2, a crank rotating shaft 3, a framework oil seal 4, a first ball bearing 5, a front main spiral bevel gear 6, a front slave spiral bevel gear 7, a second ball bearing 8, a third ball bearing 9, a locking screw 10, a transmission shaft shell assembly 11, a transmission mandrel 12, a gear shifting fork 13, a driving sleeve 14, a guide sleeve 15, a reset spring 16, an inner gear ring 17, a planet carrier mechanism 18, a rear main spiral bevel gear mechanism 19, a transmission shaft cover 20, a rear slave spiral bevel gear 21, a sun gear mechanism 22, a gear box assembly and a gear box assembly,
The planet carrier comprises a planet carrier body 100, a ball bearing 101, a planet wheel 102, a pawl 103, a pawl spring 104, a shaft clamp spring 105 and a mounting screw 106; a ratchet outer sleeve 300, a rear main spiral bevel gear 301, a ball bearing 302, a ball bearing 303 and a shaft clamp spring 304;
the sun gear comprises a sun gear body 200, a sun gear pawl 201, a rotating pin 202 and a pawl spring 203.
Detailed Description
The following provides a detailed description of the preferred embodiments of the present invention with reference to the accompanying drawings.
Fig. 1 is a sectional view of the present invention, fig. 2-1 is a schematic view of a carrier mechanism, fig. 2-2 is a schematic sectional view a-a of fig. 2-1, and fig. 2-3 is a schematic view of a carrier mechanism. As shown in the above figures: the invention provides a three-gear speed change chainless transmission shaft device of a bicycle, which comprises a middle shaft shell 1, a middle shaft cover 2, a crank rotating shaft 3, a framework oil seal 4, a ball bearing 5, a front main spiral bevel gear 6, a front slave spiral bevel gear 7, a second ball bearing 8, a third ball bearing 9, a locking screw 10, a transmission shaft shell assembly 11, a transmission mandrel 12, a gear shifting fork 13, a driving sleeve 14, a guide sleeve 15, a return spring 16, an inner gear ring 17, a planet carrier mechanism 18, a rear main spiral bevel gear mechanism 19, a transmission shaft cover 20, a rear slave spiral bevel gear 21 and a sun gear mechanism 22.
The planet carrier mechanism 18 is composed of a planet carrier body 100, a ball bearing 101, four planet wheels 102, four pawls 103, pawl springs 104, a shaft clamp spring 105 and four mounting screws 106; the rear main spiral bevel gear mechanism 19 comprises a ratchet outer sleeve 300, a rear main spiral bevel gear 301, a ball bearing 302, a ball bearing 303, a shaft snap spring 304 and the like; the sun gear mechanism 22 is composed of a sun gear body 200, four sun gear pawls 201, four rotation pins 202, and a pawl spring 203.
Referring to fig. 1, a front main spiral bevel gear 6 is supported and installed in a middle shaft cover 2 through a first ball bearing 5 and is connected with a right end spline of a crank rotating shaft 3, and the left end of the crank rotating shaft 3 is fixed with a middle shaft shell 1 through a third ball bearing 9; framework oil seals 4 are arranged at the left end and the right end of the crank rotating shaft 3 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 front driven spiral bevel gear 7 is supported and installed at the front end of a transmission shaft shell assembly 11 through a second ball bearing 8, and a transmission mandrel 12 fixes the front driven spiral bevel gear 7 and a rear main spiral bevel gear mechanism 19 through a screw 10; the first ball bearing 5 and the third ball bearing 9 support the crank rotating shaft 3 and bear the power input load of the whole transmission shaft; the inner gear ring 17 is arranged in the middle of the rear end of the transmission shaft shell assembly 11 in an interference manner; the left part of the rear end of the transmission shaft shell assembly 11 is provided with an elongated slot, a guide sleeve 15 is arranged on the outer diameter of a driving sleeve 14, a gear shifting fork 13 penetrates through the elongated slot and is in threaded connection with the guide sleeve 15, the bottom of the gear shifting fork 13 is clamped in a groove at the left end of the driving sleeve 14, the driving sleeve 14 is driven to move left and right when the gear shifting fork 13 moves left and right, and the guide sleeve 15 and the driving sleeve 14 can rotate mutually; the planet carrier mechanism 18 is provided with 4 pawls 103 and is supported and mounted at the left part of the rear end of the transmission shaft housing assembly 11 through a bearing 101, the sun gear 200 is provided with four sun gear pawls 201, the inner gear ring 17 is mounted at the middle part of the rear end of the transmission shaft housing assembly 11 in an interference manner, the gear shifting fork 13 forces the driving sleeve 14 to move left and right, the reset spring 16 forces the driving sleeve 14 to be positioned at the left position when not influenced by external force, and the meshing relation between the driving sleeve 14 and the planet carrier mechanism 18 and the sun gear mechanism 22 is changed to achieve the quick-acting effect. The front driven spiral bevel gear 7 is driven by the front main spiral bevel gear 6, the torque is transmitted to the rear driving sleeve 14 through the transmission mandrel 12, the driving sleeve 14 is changed to be meshed with the planet carrier mechanism 18 or the sun gear mechanism 22 according to different speed requirements, the torque is transmitted to the main spiral bevel gear mechanism 19 through the pawls 103 or the sun gear pawls 201, and then the power is transmitted to the rear hub from the spiral bevel gear 21 to drive the rear wheel to move.
Referring to FIGS. 2-1, 2-2, and 2-3, the planet carrier mechanism 18 is formed from: the four planet wheels 102 are uniformly arranged in the planet carrier body 100 through mounting screws 106, and the four pawls 103 are arranged at the right end of the planet carrier body 100 through pawl springs 104 and prop against the ratchet groove at the left end of the ratchet outer sleeve 300; the bearing 101 is installed on the planet carrier body 100 through a shaft snap spring 105 and is installed and stored coaxially with the transmission shaft shell assembly 11 at the front end in a matched mode, the planet carrier mechanism 18 is coaxial with the transmission mandrel 12, and the planet carrier body 100 comprises a key groove and can be matched with a key of the driving sleeve 14 to transmit power.
As shown in fig. 3-1, 3-2 and 3-3, the sun gear mechanism 22 is composed of the following components: the right end of the sun gear body 200 is provided with four sun gear pawls 201 and is positioned by four rotating pins 202; the pawl spring 203 always forces the sun wheel pawl 201 to contact with the ratchet groove at the right end of the ratchet outer sleeve 300; the bottom of the sun wheel pawl 201 is provided with a conical surface, when the driving sleeve 14 moves to the right position, the boss at the right end of the driving sleeve 14 contacts the conical surface at the bottom of the sun wheel pawl 201 to force the sun wheel pawl 201 to be separated from the ratchet groove at the right end of the ratchet outer sleeve 300, and at the moment, the sun wheel mechanism 22 and the rear main spiral bevel gear mechanism 19 are in a clutch state; when the driving sleeve 14 is in the left position or the middle position, the sun wheel pawls 201 are contacted with the left end ratchet grooves of the ratchet outer sleeve 300 under the action of the pawl spring 203, and the sun wheel mechanism 22 and the rear main spiral bevel gear mechanism 19 are in a connection state.
As shown in fig. 3-1, 3-2 and 3-3, the rear main helical bevel gear mechanism 19 is constituted by: the ball bearing 302 is arranged on the outer diameter of the rear main spiral bevel gear 301 and is connected with the ratchet outer sleeve 300 through threads; the ball bearing 303 is arranged in the rear main spiral bevel gear 301 and is fixed by a clamp spring 304; the rear main spiral bevel gear mechanism 19 enables parts at the left end and the right end of the transmission mandrel 12 to be connected into a whole through locking screws 10.
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 with the flexibility, shifts more reliably.
Referring to fig. 4-1, 4-2 and 4-3, the driving sleeve 14, the inner gear ring 17, the planet carrier mechanism 18, the rear main spiral bevel gear mechanism 19 and the sun gear mechanism 22 are installed in a simplified diagram, and three speeds are adjustable. The reference circle radius of the ring gear 17 is r2, and the reference circle radius of the sun gear mechanism 22 is r 1.
In a default state, the reset spring 16 forces the driving sleeve 14 to be located at the left position, a convex key on the driving sleeve 14 is connected with a key groove of the planet carrier mechanism 18 and is not connected with the sun gear mechanism 22, a pawl 103 on the planet carrier mechanism 18 abuts against a ratchet groove at the left end of the ratchet sleeve 300, a sun gear pawl 201 on the sun gear mechanism 22 also abuts against a ratchet groove at the right end of the ratchet sleeve 300, at the moment, the planet carrier mechanism 18 is a driving part, the inner gear ring 17 is a fixed part, the sun gear mechanism 22 is a driven part, so that the speed-increasing movement is realized, and the speed ratio is 1: 1+ r2/r1, the sun gear member 22 is faster than the carrier member 18, so the pawls 103 on the carrier member 18 are not active, which is the mode typically used during a passing ride.
When the gear shifting fork 13 forces the driving sleeve 14 to be located at the middle position, at this time, a convex key on the driving sleeve 14 is in key groove connection with the planet carrier mechanism 18 and is connected with the sun gear mechanism 22, the driving sleeve 14, the planet carrier mechanism 18 and the sun gear mechanism 22 are connected into a whole, a pawl 103 on the planet carrier mechanism 18 abuts against a ratchet groove at the left end of the ratchet outer sleeve 300, a sun gear pawl 201 on the sun gear mechanism 22 also abuts against a ratchet groove at the right end of the ratchet outer sleeve 300, at this time, the planet carrier mechanism 18 and the sun gear mechanism 22 are driving parts, the inner gear ring 17 is a fixed part, so that the constant-speed motion is realized, and the speed ratio is 1: 1, riding on the flat ground adopts the mode.
When the shift fork 13 forces the driving sleeve 14 to be located at the right position, the convex key on the driving sleeve 14 is not in keyway connection with the planet carrier mechanism 18 and is connected with the sun gear mechanism 22, the pawl 103 on the planet carrier mechanism 18 abuts against the ratchet groove at the left end of the ratchet sleeve 300, and the sun gear pawl 201 on the sun gear mechanism 22 is disengaged from the ratchet groove at the right end of the ratchet sleeve 300, so that the planet carrier mechanism 18 and the rear main helical bevel gear mechanism 19 are connected into a whole, and at this time, the planet carrier mechanism 18 is a driven part, the sun gear mechanism 22 is a driving part, and the ring gear 17 is a fixed part, so that the speed reduction movement is realized at a speed ratio of 1+ r2/r 1: 1, the riding starting and climbing adopt the mode.
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 merely illustrative of the principles of the present invention, but that various changes and modifications may be made without departing from the spirit and scope of the invention, which is defined by the appended claims and their equivalents.
Claims (4)
1. A three-gear speed-changing chainless transmission shaft of a bicycle is characterized in that: the bicycle three-gear speed change chainless transmission shaft comprises:
the device comprises a middle shaft shell (1), a middle shaft cover (2), a crank rotating shaft (3), a framework oil seal (4), a first ball bearing (5), a front main spiral bevel gear (6), a front slave spiral bevel gear (7), a second ball bearing (8), a third ball bearing (9), a locking screw (10), a transmission shaft shell assembly (11), a transmission mandrel (12), a gear shifting fork (13), a driving sleeve (14), a guide sleeve (15), a reset spring (16), an inner gear ring (17), a planet carrier mechanism (18), a rear main spiral bevel gear mechanism (19), a transmission shaft cover (20), a rear slave spiral bevel gear (21) and a sun gear mechanism (22);
the front main spiral bevel gear (6) is supported and installed in the middle shaft cover (2) through a first ball bearing (5) and is in spline connection with the right end of the crank rotating shaft (3), and the left end of the crank rotating shaft (3) is fixed with the middle shaft shell (1) through a third ball bearing (9); framework oil seals (4) are arranged at the left end and the right end of the crank rotating shaft (3) 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 front driven spiral bevel gear (7) is supported and mounted at the front end of a transmission shaft shell assembly (11) through a second ball bearing (8), and a transmission mandrel (12) is fixed with the front driven spiral bevel gear (7) and a rear main spiral bevel gear mechanism (19) through a locking screw (10); the first ball bearing (5) and the third ball bearing (9) support the crank rotating shaft (3) and bear the power input load of the whole transmission shaft; the inner gear ring (17) is arranged in the middle of the rear end of the transmission shaft shell assembly (11) in an interference manner; the left part of the rear end of the transmission shaft shell assembly (11) is provided with an elongated slot, a guide sleeve (15) is arranged on the outer diameter of a driving sleeve (14), a gear shifting fork (13) penetrates through the elongated slot and is in threaded connection with the guide sleeve (15), the bottom of the gear shifting fork (13) is clamped in a groove at the left end of the driving sleeve (14), the driving sleeve (14) is driven to move left and right when the gear shifting fork (13) moves left and right, the guide sleeve (15) and the driving sleeve (14) can rotate mutually, a planet carrier mechanism (18) is provided with four pawls (103) and is supported and arranged at the left part of the rear end of the transmission shaft shell assembly (11) through a bearing (101), four sun wheel pawls (201) are arranged on a sun wheel (200), an inner gear ring (17) is arranged in the middle part of the rear end of the transmission shaft shell assembly (11) in an interference manner, the gear (13) forces the driving sleeve (14) to move right, and a reset spring (16) forces the driving sleeve (14) to be positioned at the left position when not acted by external force, the meshing relation between the driving sleeve (14) and the planet carrier mechanism (18) and the sun gear mechanism (22) is changed to achieve the speed change effect; the front driven spiral bevel gear (7) is driven by the front main spiral bevel gear (6), and the torque is transmitted to the driving sleeve (14) by the transmission mandrel (12).
2. The bicycle three speed variable chainless transmission shaft of claim 1, wherein: according to different speed requirements, the meshing of the driving sleeve (14) and the planet carrier mechanism (18) or the sun gear mechanism (22) is changed, the torque is transmitted to the main spiral bevel gear mechanism (19) through the pawls (103) or the pawls (201) of the sun gear, and then the power is transmitted to the rear hub from the spiral bevel gear (21) to drive the rear wheel to move.
3. The bicycle three speed variable chainless transmission shaft of claim 1, wherein: the sun gear of the transmission shaft is a rotating part.
4. The bicycle three speed variable chainless transmission shaft of claim 1, wherein: the speed change effect is achieved by changing the meshing relationship of the driving sleeve, the planet carrier mechanism and the sun gear mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111269556.7A CN114148444B (en) | 2021-10-29 | 2021-10-29 | Three-gear speed-changing chainless transmission shaft of bicycle |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111269556.7A CN114148444B (en) | 2021-10-29 | 2021-10-29 | Three-gear speed-changing chainless transmission shaft of bicycle |
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| Publication Number | Publication Date |
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| CN114148444A true CN114148444A (en) | 2022-03-08 |
| CN114148444B CN114148444B (en) | 2023-03-24 |
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| CN202111269556.7A Active CN114148444B (en) | 2021-10-29 | 2021-10-29 | Three-gear speed-changing chainless transmission shaft of bicycle |
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| CN114148444B (en) | 2023-03-24 |
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