CN119773473B - A type of gearbox - Google Patents
A type of gearboxInfo
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- CN119773473B CN119773473B CN202510064578.1A CN202510064578A CN119773473B CN 119773473 B CN119773473 B CN 119773473B CN 202510064578 A CN202510064578 A CN 202510064578A CN 119773473 B CN119773473 B CN 119773473B
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- gear
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- shifting
- power
- ratchet
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Abstract
本发明涉及一种变速箱，包括驱动轴机构，驱动轴机构包括中轴和套在中轴上的传动主齿以及多个动力输出齿轮，传动主齿与中轴转动连接，动力输出齿轮与中轴径向固定连接，传动主齿包括至少一个传动分齿；变速轴机构，变速轴机构包括变速轴，变速轴上套设有多个动力接收齿轮以及至少一个动力回传齿轮，动力接收齿轮与动力输出齿轮一一对应啮合，动力回传齿轮与传动分齿一一对应啮合；变挡机构，变挡机构包括凸轮轴、变挡动力件、行星齿轮组，凸轮轴同轴设置在变速轴的内腔，凸轮轴与变速轴转动连接，凸轮轴的一端固定连接有换挡轴，行星齿轮组安装在换挡轴上，凸轮轴上轴向设置有多个驱动凹槽，变速轴上轴向设置有多组棘齿啮合单元。
This invention relates to a gearbox, comprising a drive shaft mechanism, which includes a central shaft, a main transmission gear sleeved on the central shaft, and multiple power output gears. The main transmission gear is rotatably connected to the central shaft, and the power output gears are radially fixedly connected to the central shaft. The main transmission gear includes at least one transmission tooth. A shift shaft mechanism includes a shift shaft, on which multiple power receiving gears and at least one power return gear are sleeved. The power receiving gears mesh with the power output gears in a one-to-one correspondence, and the power return gear meshes with the transmission tooth in a one-to-one correspondence. A shift mechanism includes a camshaft, a shift power component, and a planetary gear set. The camshaft is coaxially disposed within the inner cavity of the shift shaft and is rotatably connected to the shift shaft. One end of the camshaft is fixedly connected to a shift shaft. The planetary gear set is mounted on the shift shaft. Multiple drive grooves are axially arranged on the camshaft, and multiple sets of ratchet meshing units are axially arranged on the shift shaft.
Description
Technical Field
The invention relates to the technical field of gearboxes, in particular to a gearbox.
Background
At present, vehicles for outdoor travel are more and more diversified and intelligent, and original single power sources are changed into two power sources, so that better driving experience can be provided, such as new energy hybrid vehicles, electric power assisted bicycles and the like. However, how to provide proper power by using another power as an auxiliary power in a specific operation is particularly important, and directly influences driving experience.
The Chinese patent application publication No. CN116857362B discloses an electronic gear shifting gearbox system which comprises a box type gearbox and an electronic gear shifting control system, wherein the box type gearbox comprises a box body, a main shaft, a secondary shaft, a main shaft gear, a secondary shaft gear and a ratchet wheel. In the electronic gear shifting gearbox system, the gear shifting is difficult to increase due to the fact that the gear shifting quantity is limited by the structure, the structure of an end face ratchet wheel is poor in gear shifting timeliness, a middle shaft is sometimes required to rotate and then can be hung on the gear, and the cam mechanism which is moved up and down on a gear shifting drum rod by means of a shifting fork convex column on a shifting fork seat is thin and easy to wear, easy to damage, easy to fail in elastic piece and difficult to replace.
In order to solve the technical problems, the invention provides a gearbox which can be used for rotating machinery for simultaneously outputting two types of power, and is not limited to hybrid electric vehicles and electric booster bicycles.
Disclosure of Invention
The invention provides a gearbox aiming at the technical problems in the prior art.
The technical scheme for solving the technical problems is as follows, the gearbox comprises:
the driving shaft mechanism comprises a central shaft, a transmission main tooth sleeved on the central shaft and a plurality of power output gears, the transmission main tooth is rotationally connected with the central shaft, the power output gears are radially and fixedly connected with the central shaft, and the transmission main tooth comprises at least one transmission sub-tooth;
The speed change shaft mechanism comprises a speed change shaft, a plurality of power receiving gears and at least one power returning gear are sleeved on the speed change shaft, the power receiving gears are meshed with the power output gears in a one-to-one correspondence manner, and the power returning gears are meshed with the transmission sub-gears in a one-to-one correspondence manner;
The gear shifting mechanism comprises a cam shaft, a gear shifting power piece and a planetary gear set, wherein the cam shaft is coaxially arranged in an inner cavity of a gear shifting shaft, the cam shaft is connected with the gear shifting shaft in a rotating mode, one end of the cam shaft is fixedly connected with a gear shifting shaft, the planetary gear set is installed on the gear shifting shaft, a plurality of driving grooves are axially formed in the cam shaft, a plurality of groups of ratchet meshing units are axially formed in the gear shifting shaft, the driving grooves are in one-to-one correspondence with the ratchet meshing units, each power receiving gear and each power returning gear are provided with inner teeth, each power receiving gear and each power returning gear are correspondingly matched with a group of ratchet meshing units, the gear shifting power piece transmits power to the cam shaft through the planetary gear set and the gear shifting shaft, and the cam shaft rotates to change the states of the ratchet meshing units so as to achieve radial fixed connection of one power receiving gear and one power returning gear with the gear shifting shaft.
Preferably, the gearbox is provided, wherein the torque sensor is mounted on the driving main gear.
Preferably, the gear box comprises a ratchet, an elastic wire ring and a ratchet cavity, wherein a plurality of annular grooves are formed in the outer portion of the gear box shaft, the elastic wire ring is embedded in the annular grooves, and the ratchet is installed in the ratchet cavity.
Preferably, the above gearbox, wherein the ratchet includes brake foot, revolving stage, meshing portion and dials the fluting, elastic bead ring passes and dials the fluting and will the ratchet is in ratchet intracavity, meshing portion be used for with power receiving gear, power return gear's internal tooth meshing, the bottom in ratchet chamber position is provided with the through-hole, the brake foot passes the through-hole and can be in the through-hole is swung, the drive recess is used for driving the brake foot is swung around the revolving stage.
Preferably, the above gearbox, wherein the planetary gear set includes a planet carrier, an outer gear ring fixedly arranged, and a gear shifting gear ring rotatably arranged, the planet carrier is rotatably connected with the gear shifting shaft, two sets of planetary transmission mechanisms are installed on the planet carrier, a sun gear a and a sun gear B are installed on the gear shifting shaft, the sun gear a and the sun gear B are meshed with the two sets of planetary transmission mechanisms in a one-to-one correspondence manner, gear shifting gear ring internal teeth are arranged on the gear shifting gear ring, one set of planetary transmission mechanisms is meshed with the outer gear ring, and the other set of planetary transmission mechanisms is meshed with the gear shifting gear ring internal teeth.
Preferably, in the gearbox, a limiting groove is formed in the cam shaft, a limiting column is mounted on the speed changing shaft, and the limiting column is inserted into the limiting groove.
Preferably, in the gearbox, a toothed disc is fixed on the driving main gear.
Preferably, in the gearbox, the shift shaft is fixedly connected with the sun gear B in a radial direction, and the shift shaft is rotatably connected with the sun gear a in a radial direction.
Preferably, in the above gearbox, a fixed ring is fixed on the gear shift shaft, the sun gear a is fixedly connected with the fixed ring, the fixed ring is rotationally connected with the gear shift shaft, and the sun gear a, the fixed ring and the gear shift shaft are coaxially arranged.
Preferably, in the above gearbox, external teeth of the gear shifting gear ring are provided on the gear shifting gear ring, the gear shifting power piece is a gear shifting motor, a driving gear is mounted on an output shaft of the gear shifting motor, and the driving gear is meshed with the external teeth of the gear shifting gear ring.
The beneficial effects of the invention are as follows:
1. The gearbox provided by the invention has a simple structure, timely gear shifting response, and convenient assembly and processing of the whole gearbox, and reduces the later maintenance difficulty.
2. The torque sensor is integrated in the gearbox, the pedal frequency and the pedal torque of a rider can be collected in the whole process when the gearbox is applied to the electric power-assisted bicycle, the collected pedal frequency and pedal torque information of the rider is transmitted to the control board of the electric power-assisted bicycle through the torque sensor, the control board can accurately analyze how much electric power is needed by the rider, and corresponding power is output through the motor, so that riding experience is improved.
Drawings
Fig. 1 is a three-dimensional view of the internal structure of the present invention.
Fig. 2 is a three-dimensional view of the shift axle mechanism of the present invention.
Fig. 3 is an internal cross-sectional view of the shift axle mechanism of the present invention.
Fig. 4 is an exploded view of a portion of the components of the shift axle mechanism of the present invention.
FIG. 5 is a three-dimensional schematic view of a portion of the components of the shift axle mechanism of the present invention.
Figure 6 is a three-dimensional view of the ratchet of the present invention.
Fig. 7 is a schematic view of the structure of the transmission main gear of the present invention.
Fig. 8 is a schematic view of the external structure of the present invention.
Fig. 9 is a schematic view of the structure of the present invention applied to an electric bicycle.
FIG. 10 is a partial schematic view of the handle bar position of the present invention applied to an electric bicycle.
In the drawings, the list of components represented by the various numbers is as follows:
60. Electric bicycle, 61, crank, 62, gearbox, 63, toothed disc, 64, hub motor, 65, code table, 66, handle, 67, center shaft, 68, gear tooth a,69, gear tooth B,70, gear tooth C,71, main gear, 72, torque sensor, 721, strain gauge, 722, torque sensor control plate, 723, plastic cover, 725, coil sleeve, 7251, spacing foot, 726, shielding cover, 727, communication wire, 73, gear shift ring, 74, planetary gear set, 75, gear shift motor, 76, gear shift tooth a,77, gear shift tooth B,78, gear shift tooth C,79, gear shift tooth D,80, gear shift tooth E,81, spacer, 82, a shift shaft, 821, a ratchet cavity, 83, a ratchet, 831, a brake foot, 832, a rotary table, 833, a dial slot, 834, a meshing portion, 84, an elastic bead ring, 85, a limit post, 86, a cam shaft, 861, a drive groove 862, a limit groove, 87, a shift shaft, 88, a pin shaft, 89, a fixed ring, 90, a carrier, 91, an outer gear ring, 92, a planetary wheel shaft, 93, a planetary wheel, 94, a sun gear a,95, a sun gear B,96, a deep groove ball bearing, 97, a circlip, 98, a seal ring, 99, a left cover, 100, a middle cover, 101, a right cover, 102, a chain, 103, a flywheel, 104, a pedal, 105, and a bicycle five-way.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1 to 8, a transmission case includes a drive shaft mechanism, a shift shaft mechanism, and a shift mechanism, and the transmission case is composed of a left cover 99, a middle cover 100, and a right cover 101, and the left cover 99, the middle cover 100, and the right cover 101 are connected by screws, and enclose the internal structure of the transmission case 62.
The driving shaft mechanism comprises a center shaft 67, a transmission main tooth 71 sleeved on the center shaft 67 and three power output gears, the center shaft 67 penetrates through the transmission main tooth 71, the transmission main tooth 71 is rotationally connected with the center shaft 67, and the center shaft 67 supports the transmission main tooth 71 through a needle bearing. The drive main tooth 71 comprises two drive sub-teeth. The power output gear is fixedly connected with the central shaft 67 in the radial direction, the three power output gears are respectively a transmission tooth A68, a transmission tooth B69 and a transmission tooth C70, the inner rings of the transmission tooth A68, the transmission tooth B69 and the transmission tooth C70 are of spline structures, part of the central shaft 67 is a spline shaft, and the transmission tooth A68, the transmission tooth B69 and the transmission tooth C70 are connected with the central shaft 67 through splines. A tooth disc 63 is fixed to the transmission main tooth 71 for transmitting power.
The speed change shaft mechanism comprises a speed change shaft 82, three power receiving gears and two power returning gears are sleeved on the speed change shaft 82, the three power receiving gears and the two power returning gears can be meshed and separated through ratchets 83, the speed change shaft mechanism is rotationally connected with the speed change shaft 82 during separation, and the speed change shaft mechanism has the same angular velocity with the speed change shaft 82 during meshing. The three power receiving gears are respectively a speed change tooth A76, a speed change tooth B77 and a speed change tooth C78, and the two power returning gears are respectively a speed change tooth D79 and a speed change tooth E80. The gear tooth A76, the gear tooth B77, the gear tooth C78, the gear tooth D79 and the gear tooth E80 have internal teeth and external teeth, and the gear tooth A76, the gear tooth B77, the gear tooth C78, the gear tooth D79 and the gear tooth E80 are meshed with two transmission sub-teeth of the gear tooth A68, the gear tooth B69, the gear tooth C70 and the transmission main tooth 71.
The gear change mechanism includes a camshaft 86, a gear change motor 75, and a planetary gear set 74. The cam shaft 86 is coaxially disposed within the interior cavity of the shift shaft 82, and the cam shaft 86 is rotatably coupled to the shift shaft 82. One end of a cam shaft 86 is fixedly connected with a shift shaft 87 through a pin 88. The planetary gear set 74 is mounted on a shift shaft 87. The planetary gear set 74 includes a carrier 90, a fixedly disposed external ring gear 91, and a rotatably disposed shift ring gear 73. The planet carrier 90 is rotatably connected with the gear shifting shaft 87, the outer gear ring 91 is fixed on the right cover 101, and a deep groove ball bearing 96 is arranged between the planet carrier 90 and the gear shifting shaft 87. The speed change shaft 82 is fixedly provided with a fixed ring 89, the sun wheel A94 is fixedly connected with the fixed ring 89, the fixed ring 89 is rotationally connected with the gear change shaft 87, and the sun wheel A94, the fixed ring 89 and the speed change shaft 82 are coaxially arranged. Two planetary transmission mechanisms are mounted on the planetary carrier 90, the two planetary transmission mechanisms share one planetary carrier 90, the planetary set 74 is provided with four groups of planetary gears 93, each group of planetary gears 93 shares one planetary wheel shaft 92, the planetary gears 93 are mounted on the planetary wheel shafts 92 through split collars 97, and the two planetary gears 93 of each group can rotate relatively freely. The gear shift shaft 87 is provided with a sun gear A94 and a sun gear B95, and the sun gear A94 and the sun gear B95 are respectively meshed with the two groups of planetary transmission mechanisms. The gear shifting shaft 87 can freely rotate in the sun gear A94, a sealing ring 98 is arranged between the gear shifting shaft 87 and the sun gear A94, a polygonal hole is formed in the middle of the sun gear B95, the head of the gear shifting shaft 87 is the same polygonal shaft, the sun gear B95 is connected with the gear shifting shaft 87 through a polygonal structure, and the sun gear B95 and the gear shifting shaft 87 have the same angular velocity.
The gear change ring 73 is provided with gear change ring external teeth and gear change ring internal teeth, one set of planetary gear mechanism is meshed with the external gear 91, and the other set of planetary gear mechanism is meshed with the gear change ring internal teeth. The output shaft of the gear-shifting motor 75 is provided with a drive gear which meshes with the external teeth of the gear-shifting ring gear. The gear shifting ring 73 is sleeved on the outer cylinder of the right cover 101 and can rotate freely.
When the shift shaft 82 rotates, the sun gear a 94 drives the planet gears 93 of the lower layer of the planet group 74 to rotate, the planet gears 93 of the lower layer of the planet group 74 rotate to drive the planet carrier 90 to rotate, the planet carrier 90 rotates to drive the planet gears 93 of the upper layer to rotate, and the sun gear B95 is further driven to rotate, and since the sun gear B95 and the shift shaft 87 have the same angular velocity, the shift shaft 87 also rotates together, and therefore when the shift shaft 82 rotates, the shift shaft 87 also rotates together.
When the gear shifting motor 75 drives the gear shifting gear ring 73 to rotate, the gear shifting gear ring 73 rotates to drive a layer of planet gears 93 on the planet group 74 to rotate, a layer of planet gears 93 on the planet group 74 rotates to drive a sun gear B95 to rotate, the sun gear B95 rotates to drive a gear shifting shaft 87 to rotate, the gear shifting shaft 87 rotates to drive a cam shaft 86 to rotate, the cam shaft 86 rotates relative to the gear shifting shaft 82 to perform gear shifting, and the upper layer of planet gears 93 and the lower layer of planet gears 93 of the planet group 74 can rotate freely relatively, so that the gear shifting and the rotation of the gear shifting shaft 82 are not affected by each other.
A plurality of driving grooves 861 with different shapes and depths are axially arranged on the cam shaft 86, a plurality of groups of ratchet meshing units are axially arranged on the speed changing shaft 82, and the driving grooves 861 are in one-to-one correspondence with the ratchet meshing units. Each power receiving gear and each power returning gear are correspondingly matched with a group of ratchet meshing units. When the gear-shifting motor 75 rotates, power is transmitted to the cam shaft 86 through the planetary gear set 74 and the gear-shifting shaft 87, and the rotation of the cam shaft 86 changes the state of the ratchet engagement unit to realize a radially fixed connection of a power receiving gear and a power returning gear with the speed-changing shaft 82. Meanwhile, only one power receiving gear and one power returning gear are fixedly connected with the speed changing shaft 82 in the radial direction at a time. The gearbox can realize six-gear speed change of three times two. The spacer 81 is sleeved on the outer end of the speed changing shaft 82 and is used for isolating the speed changing shaft 82 from the speed changing box shell.
The cam shaft 86 is provided with a limit groove 862, the speed change shaft 82 is provided with a limit column 85, and the limit column 85 is inserted into the limit groove 862. The cam shaft 86 can rotate inside the speed changing shaft 82, but the cam shaft 86 cannot rotate at will inside the speed changing shaft 82, and has a rotation range controlled by the limit post 85 and the limit groove 862 of the cam shaft 86, wherein the limit post 85 is provided with external threads and can be fixed on the speed changing shaft 82, the limit post 85 is provided with a cylindrical head, and the cylindrical head of the limit post 85 extends into the limit groove 862 to play a limit role.
The ratchet engagement unit comprises a ratchet 83, an elastic wire ring 84 and a ratchet cavity 821, a plurality of annular grooves are formed in the outer portion of the speed changing shaft 82, the elastic wire ring 84 is embedded in the annular grooves, and the ratchet 83 is installed in the ratchet cavity 821. The ratchet 83 includes a stopper pin 831, a rotary table 832, an engagement portion 834, and a pulling groove 833, and pulling and retracting of the ratchet 83 are rotational movements of the ratchet 83 about the center of the rotary table 832 thereof. The elastic wire ring 84 passes through the poking groove 833 to bind the ratchet 83 in the ratchet cavity 821. The ratchet 83 is pressed in the poking groove 833 of the ratchet 83 by the elastic bead ring 84 and is sleeved on the groove position of the speed changing shaft 82, so that the ratchet 83 can be prevented from falling out of the ratchet cavity 821 on the speed changing shaft 82, and the ratchet 83 can be always kept in the poking state due to the elasticity of the elastic bead ring 84. When the ratchet 83 is fully retracted, the ratchet 83 is integrally hidden in the ratchet cavity 821 on the shift shaft 82, and the gear assembled with the ratchet 83 and the shift shaft 82 can rotate freely. The engagement portion 834 is configured to engage with inner teeth of the power receiving gear and the power returning gear, a through hole is formed at a bottom of the ratchet cavity 821, the brake legs 831 pass through the through hole and can swing in the through hole, and the driving grooves 861 are configured to drive the brake legs 831 to swing around the rotary table 832. When the cam shaft 86 rotates, the braking legs 831 of the ratchet 83 cam in the driving grooves 861 opposite to the cam shaft 86, and the braking legs cooperate with the elastic bead ring 84 to control the opening and closing of the ratchet 83. The elasticity of the rotating fit elastic bead ring 84 of the cam shaft 86 can drive the ratchet 83 to be opened and closed, the opening and closing of the ratchet 83 determine whether the speed change teeth A76, the speed change teeth B77, the speed change teeth C78, the speed change teeth D79, the speed change teeth E80 and the speed change shaft 82 have the same angular velocity, and meanwhile determine which gear the gearbox is in, and the gear change response is timely.
A torque sensor 72 is mounted on the drive main tooth 71. Specifically, the strain gauge 721 of the torque sensor 72 is disposed on the driving main tooth 71, the strain gauge 721 can capture the tiny rigid deformation of the driving main tooth 71, the coil sleeve 725 is disposed with an induction coil, the induction coil is surrounded by a shielding cover 726, different rigid deformations of the driving main tooth 71 can affect different electric signals generated between the strain gauge 721 and the induction coil disposed on the coil sleeve 725 and transmit the electric signals to the torque sensor control board 722 of the torque sensor 72, the torque sensor control board processes the electric signals and transmits the electric signals out through the communication wire 727, the plastic cover 723 is disposed outside the torque sensor 72, and the limiting feet 7251 on the coil sleeve are clamped on the left cover 99, so that the driving main tooth 71 can freely rotate in the center of the torque sensor 72.
The following embodiments are described in connection with the application of the transmission to an electrically assisted variable bicycle.
As shown in fig. 9 and 10, the electric bicycle 60 is configured with a rear hub motor 64, a gear box 62 is mounted at a position of a bicycle five-way joint 105, the gear box 62 can collect the pedaling frequency and the pedaling torque of a rider through a torque sensor 72 arranged in the gear box 62, the torque sensor 72 converts the collected pedaling frequency and the pedaling torque into electric signals and transmits the electric signals to a control board of the electric bicycle, a chip in the control board of the electric bicycle 60 analyzes the signals transmitted by the torque sensor through a software algorithm and gives an instruction to the rear hub motor 64, and the rear hub motor 64 of the electric bicycle 60 determines how much electric power is provided to the bicycle through the received instruction.
When the rider does not need the electric bicycle 60 to provide power, the rider provides power to the electric bicycle 60 by stepping on the pedals 104, wherein the pedals 104 are fixed on the crank 61, the crank 61 is fixed on the middle shaft 67 of the gearbox 62, the toothed disc 63 of the electric bicycle 60 is fixed on the driving main tooth 71 of the gearbox 62, the gearbox 62 can convert the power provided by stepping on the rider to the driving main tooth 71, the driving main tooth 71 drives the toothed disc 63 to rotate, the toothed disc 63 drives the chain 102 to act, the chain 102 drives the flywheel 103 to rotate, and finally the rear wheel of the electric bicycle 60 is driven to rotate, so that the electric bicycle 60 is started.
Fig. 10 shows a partial perspective view of the handle bar position of the electric bicycle 60, the operating buttons of the gear shifting mechanism of the gearbox 62 are arranged on the turning handle 66, the turning handle 66 can be one button or a plurality of buttons, the rider can realize gear shifting by pressing the buttons on the turning handle 66, and meanwhile, the buttons on the turning handle 66 can provide a mechanical vibration feedback to the pressing fingers of the rider when pressed, and a short prompting sound is provided, and meanwhile, the code table 65 can display gear numbers to provide the rider with a sufficient gear shifting experience. The gear shifting mechanism is electronic gear shifting, and the control system can accurately control the rotation angular displacement of the gear shifting motor, so that the angular displacement of the cam shaft is accurately controlled, and accurate gear shifting is realized. The electric bicycle has compact structure while realizing high number of gears, can reduce the total weight of the electric bicycle, and is simple to operate.
Similarly, when the gearbox is applied to a hybrid electric vehicle, an output shaft of an engine is connected with a center shaft 67, torque output through speed change is transmitted to a toothed disc 63, the toothed disc 63 transmits power to an axle of the vehicle through a power transmission mechanism, the gearbox 62 can collect engine rotation speed and torque through a torque sensor 72 arranged in the gearbox, the torque sensor 72 converts collected data into an electric signal and transmits the electric signal to a control board, a chip in the control board analyzes the signal transmitted by the torque sensor through a software algorithm, analyzes how much electric power is needed by the vehicle, gives an instruction to a motor of the vehicle, and the motor determines how much electric power is provided to the vehicle through the received instruction.
In the description of the present invention, it should be understood that the terms "upper," "lower," "left," "right," and the like indicate an orientation or a positional relationship based on that shown in the drawings, and are merely for convenience of description and for simplifying the description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, as well as a specific orientation configuration and operation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, unless otherwise indicated, the meaning of "a plurality" is two or more.
In the description of the present invention, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, integrally connected, mechanically connected, electrically connected, directly connected, indirectly connected via an intermediate medium, or in communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The foregoing describes one embodiment of the present invention in detail, but the description is only a preferred embodiment of the present invention and should not be construed as limiting the scope of the invention. All equivalent changes and modifications within the scope of the present invention are intended to be covered by the present invention.
Claims (10)
1. A kind of gear box, which is used for the gear box, characterized by comprising the following steps:
The driving shaft mechanism comprises a central shaft (67), a transmission main tooth (71) sleeved on the central shaft (67) and a plurality of power output gears, wherein the transmission main tooth (71) is rotationally connected with the central shaft (67), the power output gears are radially and fixedly connected with the central shaft (67), and the transmission main tooth (71) comprises at least one transmission sub-tooth;
The speed change shaft mechanism comprises a speed change shaft (82), a plurality of power receiving gears and at least one power returning gear are sleeved on the speed change shaft (82), the power receiving gears are meshed with the power output gears in a one-to-one correspondence manner, and the power returning gears are meshed with the transmission sub-gears in a one-to-one correspondence manner;
The gear shifting mechanism comprises a cam shaft (86), a gear shifting power piece and a planetary gear set (74), wherein the cam shaft (86) is coaxially arranged in an inner cavity of the gear shifting shaft (82), the cam shaft (86) is rotatably connected with the gear shifting shaft (82), one end of the cam shaft (86) is fixedly connected with a gear shifting shaft (87), the planetary gear set (74) is installed on the gear shifting shaft (87), a plurality of driving grooves (861) are axially formed in the cam shaft (86), a plurality of groups of ratchet meshing units are axially formed in the gear shifting shaft (82), the driving grooves (861) are in one-to-one correspondence with the ratchet meshing units, each power receiving gear and each power returning gear are respectively provided with inner teeth, each power receiving gear and each power returning gear are correspondingly matched with a group of ratchet meshing units, the gear shifting power piece transmits power to the cam shaft (86) through the planetary gear set (74) and the gear shifting shaft (87), and the cam shaft (86) rotates to change the state of the ratchet meshing units so as to realize one power receiving gear and one power returning gear (82) to be fixedly connected with the gear shifting shaft (82).
2. A gearbox according to claim 1 characterised in that the drive main tooth (71) is provided with a torque sensor (72).
3. The gearbox according to claim 1, wherein the ratchet meshing unit comprises a ratchet (83), an elastic wire ring (84) and a ratchet cavity (821), a plurality of annular grooves are formed in the outer portion of the speed changing shaft (82), the elastic wire ring (84) is embedded in the annular grooves, and the ratchet (83) is installed in the ratchet cavity (821).
4. A gearbox according to claim 3 characterised in that the ratchet teeth (83) comprise a braking foot (831), a rotary table (832), an engagement portion (834) and a poking groove (833), the elastic bead ring (84) passing through the poking groove (833) to bind the ratchet teeth (83) in the ratchet cavity (821), the engagement portion (834) being arranged to engage with the internal teeth of the power receiving gear, the power return gear, the bottom of the ratchet cavity (821) being provided with a through hole, the braking foot (831) passing through the through hole and being swingable within the through hole, the driving groove (861) being arranged to drive the braking foot (831) to swing around the rotary table (832).
5. The gearbox of claim 1, wherein the planetary gear set (74) comprises a planetary carrier (90), an outer gear ring (91) fixedly arranged and a gear shifting gear ring (73) rotatably arranged, the planetary carrier (90) is rotatably connected with the gear shifting shaft (87), two groups of planetary transmission mechanisms are installed on the planetary carrier (90), a sun gear A (94) and a sun gear B (95) are installed on the gear shifting shaft (87), the sun gear A (94) and the sun gear B (95) are meshed with the two groups of planetary transmission mechanisms in a one-to-one correspondence manner, the gear shifting gear ring (73) is provided with gear shifting gear ring inner teeth, one group of planetary transmission mechanisms is meshed with the outer gear ring (91), and the other group of planetary transmission mechanisms is meshed with the gear shifting gear ring inner teeth.
6. The transmission according to claim 4, wherein the cam shaft (86) is provided with a limit groove (862), the shift shaft (82) is provided with a limit post (85), and the limit post (85) is inserted into the limit groove (862).
7. A gearbox according to claim 1 characterised in that the driving main tooth (71) is fixed with a toothed disc (63).
8. The gearbox as set forth in claim 5, wherein the shift shaft (87) is fixedly connected radially to the sun gear B (95), and the shift shaft (87) is rotatably connected radially to the sun gear A (94).
9. The gearbox of claim 8, wherein a fixed ring (89) is fixed on the speed changing shaft (82), the sun wheel A (94) is fixedly connected with the fixed ring (89), the fixed ring (89) is rotationally connected with the gear shifting shaft (87), and the sun wheel A (94), the fixed ring (89) and the speed changing shaft (82) are coaxially arranged.
10. The transmission according to claim 5, wherein the gear-shifting ring gear (73) is provided with gear-shifting ring gear external teeth, the gear-shifting power member is a gear-shifting motor (75), and a driving gear is mounted on an output shaft of the gear-shifting motor (75) and meshed with the gear-shifting ring gear external teeth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202510064578.1A CN119773473B (en) | 2025-01-15 | 2025-01-15 | A type of gearbox |
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| CN202510064578.1A CN119773473B (en) | 2025-01-15 | 2025-01-15 | A type of gearbox |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08230750A (en) * | 1995-02-28 | 1996-09-10 | Suzuki Motor Corp | Auxiliary power assisted bicycle |
| JP2010276136A (en) * | 2009-05-29 | 2010-12-09 | Honda Motor Co Ltd | Multi-speed transmission |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09123978A (en) * | 1995-10-30 | 1997-05-13 | Bridgestone Cycle Co | Automatic speed change gear operation device for bicycle |
| US8424626B2 (en) * | 2009-03-31 | 2013-04-23 | Honda Motor Co., Ltd. | Vehicle |
| US8590655B2 (en) * | 2010-01-22 | 2013-11-26 | Foster Assets Corporation | Pedal driven apparatus having a motor |
| CN112407135B (en) * | 2020-11-23 | 2021-12-31 | 八方电气(苏州)股份有限公司 | Mid-motor capable of multi-gear variable speed adjustment |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08230750A (en) * | 1995-02-28 | 1996-09-10 | Suzuki Motor Corp | Auxiliary power assisted bicycle |
| JP2010276136A (en) * | 2009-05-29 | 2010-12-09 | Honda Motor Co Ltd | Multi-speed transmission |
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| CN119773473A (en) | 2025-04-08 |
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