CN204567966U - A kind of five grades of miniature gear change-speed boxs - Google Patents
A kind of five grades of miniature gear change-speed boxs Download PDFInfo
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- CN204567966U CN204567966U CN201520123868.0U CN201520123868U CN204567966U CN 204567966 U CN204567966 U CN 204567966U CN 201520123868 U CN201520123868 U CN 201520123868U CN 204567966 U CN204567966 U CN 204567966U
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Abstract
The utility model relates to a kind of five grades of miniature gear change-speed boxs, there is main shaft, the two ends, left and right of main shaft are separately installed with left end cap and right end cap, left end cap and right end cap are equipped with cylindrical drum shell jointly, between left end cap and right end cap, are arranged with the gear wheel shaft laid respectively at above main shaft and the camshaft be positioned at below main shaft in parallel; On main shaft and between left end cap and right end cap, be arranged with the gear of the number of teeth 48 from left to right successively, left clutch sleeve, right clutch sleeve, the gear of the number of teeth 43, the gear of the number of teeth 46, left clutch sleeve, right clutch sleeve, the gear of the number of teeth 39, the number of teeth be 21 output gear and overrunning clutch sleeve.This change-speed box, driving efficiency is high, gearshift sensitieness is good, oad is little, low cost of manufacture.
Description
Technical field
The utility model relates to bicycle speed-varying unit technical field, especially a kind of five grades of miniature gear change-speed boxs.
Background technology
The outer change-speed box of existing bicycle or Electrical Bicycle easily takes off chain in shift process, and therefore internal speed-changing technology more and more comes into one's own.Research about internal speed-changing is also a lot, as: a kind of bicycle rear axle planetary transmission introduced in China Patent Publication No. CN101152896A, a kind of chain-wheel axle speed changer introduced in China Patent Publication No. CN101152895A, the fast parallel shaft transmission device of the one three introduced in China Patent Publication No. CN2532009Y, the fast bicycle speed-varying unit of one 12 introduced in the how fast gear wheel hub of a kind of planetary gear train introduced in China Patent Publication No. CN101062712A and China Patent Publication No. CN102869565A, in these technical schemes, centre shaft variable speed device can export 4 speed, exportable 3 speed of rear axle wheel hub.Existing bicycle speed-varying unit is mainly used in manually driven bicycle, does not also have the precedent on electric booster bicycle; No matter internal speed-changing is have level, or electrodeless employing parallel-axes gears transmission or Planetary Gear Transmission all nothing more than.There is following problem in above-mentioned internal speed variator of bicycle:
(1) scantling of structure is large, complex contour, and do not meet modern aesthetic and lightweight, the requirement of especially pure bicycle and man, the internal speed-changing mechanism driving system complex of planetary transmission, assembly precision is high, cost intensive;
(2) usually can not have horsepower input in shift process, namely rider can not trample stretcher, and what this did not meet people drives custom, is such as desirably in shift in the process of trampling;
(3) some internal speed changer is in the process of shift, is to adopt the longitudinal travel of handsetting gear thus the gears meshing changing the different number of teeth is also shifted gears, and this easily causes gear face to beat tooth phenomenon, damages gear, and underaction of shifting gears;
(4) actuating force needed for gearshift is comparatively large, and what usually all adopt is sliding friction pair;
(5) stage-geared, because the engagement of gear teeth face exists cliding friction, progression is more, and frictional power loss is more, thus makes rider feel very painstaking.
Utility model content
The technical problems to be solved in the utility model is: in order to solve the prior art Problems existing in above-mentioned background technology, provides a kind of five grades of miniature gear change-speed boxs, and driving efficiency is high, gearshift sensitieness is good, oad is little, low cost of manufacture.
The utility model solves the technical scheme that its technical matters adopts: a kind of five grades of miniature gear change-speed boxs, there is main shaft, the two ends, left and right of main shaft are separately installed with left end cap and right end cap, left end cap and right end cap are equipped with cylindrical drum shell jointly, between left end cap and right end cap, are arranged with the gear wheel shaft laid respectively at above main shaft and the camshaft be positioned at below main shaft in parallel, main shaft is arranged with the gear of the number of teeth 48 from left to right successively between left end cap and right end cap, left clutch sleeve, right clutch sleeve, the gear of the number of teeth 43, the gear of the number of teeth 46, left clutch sleeve, right clutch sleeve, the gear of the number of teeth 39, the number of teeth is output gear and the overrunning clutch sleeve of 21, the periphery of overrunning clutch sleeve is embedded with wire spring, left clutch sleeve is provided with left shift fork, right clutch sleeve is provided with right shift fork, main shaft is also arranged with the output sleeve being positioned at cylindrical drum housing exterior, the outer race exporting sleeve is provided with sprocket wheel and the circular nut for fixed chain wheels, export in the endoporus of sleeve and be provided with end cover, gear wheel shaft is arranged with the dual gear that the output gear being 21 with the gear of the number of teeth 39 and the number of teeth is respectively meshed, camshaft is symmetrically arranged with two shift fork covers, be provided with steel ball between each shift fork cover and camshaft, each shift fork cover is connected to the stage clip for compressing left clutch sleeve and right clutch sleeve, and the right-hand member of camshaft is arranged with wire-drawing wheel.
Further specifically, two controlled ratchets are provided with in the endoporus of the gear of the described number of teeth 48.
Further specifically, described each shift fork puts and is all connected with the axis of guide.
Further specifically, described wire-drawing wheel is set in the right-hand member of camshaft by flat key.
Further specifically, the endoporus of described overrunning clutch sleeve be provided with two match with controlled ratchet often open ratchet.
The beneficial effects of the utility model are: a kind of five grades of miniature gear change-speed boxs of the present utility model, be taken to many two-stage parallel axis gear transmission, make its driving efficiency higher, avoid stage-geared, or the driving system that planetary transmission etc. is complicated, there is from matching requirements, manufacturing cost and practical aspect clear superiority; In addition, mix practical controllable clutch and overriding clutch, controllable clutch arranges two elastic components, achieve any time and with or without shift-variable equal when input torque, significantly improve the convenience and traveling comfort that drive, namely drive impression; Adopt the mode of stirring elastic component to shift gears, avoid handsetting gear, prevent from beating tooth and gear failure, improve the sensitieness of gearshift; Gearshift adopts cylindrical cam and steel ball, cliding friction is converted to friction of rolling, shifts gears light; Adopt low module and nonstandard bearing, further reduce its oad.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated.
Fig. 1 is structural representation of the present utility model;
Fig. 2 is the cutaway view at A-A place in Fig. 1;
Fig. 3 is the cutaway view at B-B place in Fig. 1;
Fig. 4 is the cutaway view at C-C place in Fig. 2;
Fig. 5 is the cutaway view at D-D place in Fig. 1;
Fig. 6 is the mounting structure schematic diagram between output gear, dual gear and output sleeve;
Fig. 7 is the structural representation of overrunning clutch sleeve;
Fig. 8 is the mounting structure schematic diagram of left clutch sleeve and right clutch sleeve;
Fig. 9 is the structural representation of camshaft.
Label in accompanying drawing is: 1, main shaft, 3, left end cap, 6, left clutch sleeve, 8, the gear of the number of teeth 48, 11, gear wheel shaft, 14, cylindrical drum shell, 15, left shift fork, 16, right shift fork, 17, right clutch sleeve, 18, the gear of the number of teeth 43, 20, the gear of the number of teeth 46, 21, the gear of the number of teeth 39, 22, flat key one, 23, dual gear, 26, right end cap, 30, sprocket wheel, 31, circular nut, 32, export sleeve, 34, end cover, 37, flat key two, 43, overrunning clutch sleeve, 44, wire spring, 45, the number of teeth is the output gear of 21, 53, wire-drawing wheel, 54, shift fork cover, 55, steel ball, 58, camshaft, 59, flat key three, 60, stage clip, 61, controlled ratchet, 62, flat key four, 64, bolt, 66, nut, 67, often open ratchet, 68, the axis of guide.
Detailed description of the invention
By reference to the accompanying drawings the utility model is described in further detail now.These accompanying drawings are the schematic diagram of simplification, only basic structure of the present utility model are described in a schematic way, and therefore it only shows the formation relevant with the utility model.
With reference to figure 1, a kind of five grades of miniature gear change-speed boxs, there is main shaft 1, the two ends, left and right of main shaft 1 are separately installed with left end cap 3 and right end cap 26, left end cap 3 and right end cap 26 are equipped with cylindrical drum shell 14 jointly, between left end cap 3 and right end cap 26, are arranged with the gear wheel shaft 11 laid respectively at above main shaft 1 and the camshaft 58 be positioned at below main shaft 1 in parallel, main shaft 1 is arranged with the gear 8 of the number of teeth 48 from left to right successively between left end cap 3 and right end cap 26, left clutch sleeve 6, right clutch sleeve 17, the gear 18 of the number of teeth 43, the gear 20 of the number of teeth 46, left clutch sleeve 6, right clutch sleeve 17, the gear 21 of the number of teeth 39, the number of teeth is output gear 45 and the overrunning clutch sleeve 43 of 21, the periphery of overrunning clutch sleeve 43 is embedded with wire spring 44, left clutch sleeve 6 is provided with left shift fork 15, right clutch sleeve 17 is provided with right shift fork 16, main shaft 1 is also arranged with the output sleeve 32 being positioned at cylindrical drum shell 14 outside, the outer race exporting sleeve 32 is provided with sprocket wheel 30 and the circular nut 31 for fixed chain wheels 30, export in the endoporus of sleeve 32 and be provided with end cover 34, gear wheel shaft 11 is arranged with the dual gear 23 that the output gear 45 being 21 with the gear 21 of the number of teeth 39 and the number of teeth is respectively meshed, camshaft 58 is symmetrically arranged with two shift fork covers 54, steel ball 55 is provided with between each shift fork cover 54 and camshaft 58, each shift fork cover 54 is connected to the stage clip 60 for compressing left clutch sleeve 6 and right clutch sleeve 17, the right-hand member of camshaft 58 is arranged with wire-drawing wheel 53, with reference to figure 1 and Fig. 9: wire-drawing wheel 53 is by flat key 4 62, and be locked on camshaft 58 by back-up ring, pull wire-drawing wheel 53 that camshaft 58 can be driven to rotate by bracing wire.The interior shift fork with being placed in camshaft 54 of cam path that steel ball 55 is embedded in camshaft 54 overlaps in the circular hole of 54, left shift fork 15, right shift fork 16, by packing ring and back-up ring rigid locking on shift fork cover, also empty set is on the axis of guide 68 for left shift fork 15, right shift fork 16 in addition, and left shift fork 15, right shift fork 16 and shift fork overlap the unintentional rotation of 54 and do not slide axially.Stage clip 60 clamped by left shift fork 15, right shift fork 16, thus wire-drawing wheel 53 is when driving camshaft 58 to rotate, because the half of steel ball 55 is overlapped in 54 circular holes at shift fork, can not rotate around cam 58 axis, second half of steel ball 55 is positioned at camshaft 58 cam path, steel ball 55 is caused to roll in cam path and axially move, shift fork cover 54 moves, stage clip 60 sway is driven by shift fork cover 54 and left shift fork 15, right shift fork 16, stage clip is made to press the fin of controlled ratchet 61, controlled ratchet 61 is upspring, and its corresponding gear handle ratchet wheel groove engages, and realizes shift.Camshaft there are two groups of shift fork covers 54 and two cover left shift fork 15, right shift forks 16, control the stage clip 60 of about two groups controllable clutch respectively, realize the shift control of 2,3,4,5 grades.
Adjust about bracing wire: because bracing wire is generally steel wire pull line, use a period of time plasticity to fluff, can not shift gears smoothly, be provided with adjusting mechanism for this reason, with reference to figure 1 and Fig. 3, the long-armed of wire-drawing wheel is embedded in the arc groove of cylindrical drum shell 14, after bracing wire fluffs, because arc groove has blocked the rotation of wire-drawing wheel, therefore outside transmission case, rotate counterclockwise shift handle, when handle can not rotate, adjustment bracing wire degree of tightness.
Wherein, with reference to figure 1 and Fig. 8: the controlled ratchet 61 of right part is embedded in the ratchet slot of right clutch sleeve 17, the wire spring 43 be embedded in right clutch sleeve 17 spring groove compresses the fin of controlled ratchet 61 all the time, controlled ratchet 61 is always in closure state, not transferring power, stage clip 60 can slide on right clutch sleeve 17, stirred by the shift fork of assembly of shifting gears, another fin of the controlled ratchet 61 of pressure of sliding to the right right part, controlled ratchet 61 flicks, can engage by gear ratchet slot corresponding with it, transferring power.The controlled ratchet 61 of left part is embedded in the ratchet slot of left clutch sleeve 6, the wire spring 43 be embedded in left clutch sleeve 6 spring groove compresses the fin of controlled ratchet 61 all the time, ratchet 61 is always in closure state, not transferring power, stage clip 60 can slide on left clutch sleeve 6, is stirred by the shift fork of assembly of shifting gears, another fin of the ratchet 61 of pressure of sliding left left part, controlled ratchet 61 flicks, and can engage by gear ratchet slot corresponding with it, transferring power.With reference to figure 8, left and right controllable clutch shares a stage clip 60, and form one group of power-transfer clutch, when obvious stage clip is in midway location, left and right controllable clutch is all in closure state, not transferring power.Stage clip is in right position will have the corresponding gear except 1 grade.Be positioned at the spring backing pin restraining line spring of left and right controllable clutch sleeve pin nail and the rotation of stage clip 60, prevent the opening of spring from forwarding on the fin of ratchet, avoid ratchet surprisingly to upspring or close.
With reference to figure 2, in the endoporus of the gear 8 of the number of teeth 48, be provided with two controlled ratchets 61.Each shift fork cover 54 is all connected with the axis of guide 68.
With reference to figure 3, wire-drawing wheel 53 is set in the right-hand member of camshaft 58 by flat key 4 62.
With reference to figure 5, the endoporus of overrunning clutch sleeve 43 be provided with two match with controlled ratchet 61 often open ratchet 67, ratchet 67 is embedded in overrunning clutch sleeve 43 ratchet slot, the wire spring 44 be embedded in overrunning clutch sleeve 43 spring groove compresses the fin of ratchet 67 all the time, ratchet 67 is always in the state of flicking, and prepares at any time to engage with the ratchet slot on the output sleeve 32 in output precision.
This change-speed box each shelves power transmission line and shift control step as follows:
One, 1 grade of power transmission line, with reference to figure 1 and Fig. 7: flat key 2 37 is embedded between the keyway of on main shaft 1 and the keyway of overrunning clutch sleeve 43, the input power of main shaft 1 is passed to overrunning clutch sleeve 43, ratchet 67 is embedded between overrunning clutch sleeve 43 pawl slot and the ratchet slot exporting sleeve 32, transmission of power can be given and export sleeve 32, export sleeve 32 to be connected with sprocket wheel 30 rigidity, thus power through main shaft 1, flat key 34, overrunning clutch sleeve 43, ratchet 67, export sleeve 32, sprocket wheel 30 exports, and is direct speed 1 grade.
Two, 2 grades of power transmission lines, with reference to figure 1 and Fig. 8: flat key 3 59 is embedded between the keyway of main shaft 1 and right clutch sleeve 17, the input power of main shaft 1 is passed to right clutch sleeve 17, controlled ratchet 61 is embedded between the ratchet slot of gear 21 of right clutch sleeve 17 pawl slot and the number of teeth 39, can by transmission of power to the gear 21 of the number of teeth 39, the gear 21 of the number of teeth 39 engages with 23 left gears of dual gear, right gear and the number of teeth of dual gear 23 be 21 output gear 45 engage, the number of teeth be 21 output gear 45 with export sleeve 32 and be connected by spline rigidity, export sleeve 32 to be connected with sprocket wheel 30 rigidity, thus power is through main shaft 1, flat key 3 59, right clutch sleeve 17, controlled ratchet 61, the gear 21 of the number of teeth 39, dual gear 23, the number of teeth is the output gear 45 of 21, export sleeve 32, sprocket wheel 30 exports, it is 2 grades.
Three, 3 grades of power transmission lines, with reference to figure 1 and Fig. 8: flat key 3 59 is embedded between the keyway of main shaft 1 and right clutch sleeve 17, the input power of main shaft 1 is passed to right clutch sleeve 17, controlled ratchet 61 is embedded between the ratchet slot of gear 18 of right clutch sleeve 17 pawl slot and the number of teeth 43, can by transmission of power to the gear 18 of the number of teeth 43, gear 18 and the number of teeth on gear wheel shaft 11 of the number of teeth 43 are the gear gears meshing of 17, gear wheel shaft is connected by flat key 1 and dual gear 23 rigidity, the right gear of dual gear 23 engages with output gear 45, the number of teeth be 21 output gear 45 with export sleeve 32 and be connected by spline rigidity, export sleeve 32 to be connected with sprocket wheel 30 rigidity, thus power is through main shaft 1, flat key 3 59, right clutch sleeve 17, controlled ratchet 61, the gear 18 of the number of teeth 43, gear wheel shaft 11, dual gear 23, the number of teeth is the output gear 45 of 21, export sleeve 32, sprocket wheel 30 exports, it is 3 grades.
Four, 4 grades of power transmission lines, with reference to figure 1 and Fig. 8: flat key 3 59 is embedded between the keyway of main shaft 1 and left clutch sleeve 6, the input power of main shaft 1 is passed to the right sleeve 6 of controllable clutch, controlled ratchet 61 is embedded between the ratchet slot of the pawl slot of left clutch sleeve 6 and the gear 20 of the number of teeth 46, can by transmission of power to the gear 20 of the number of teeth 46, gear 20 and the number of teeth on gear wheel shaft 11 of the number of teeth 46 are the gear gears meshing of 14, gear wheel shaft is connected by flat key 1 and dual gear 23 rigidity, right gear and the number of teeth of dual gear 23 be 21 output gear 45 engage, output gear 45 is connected by spline rigidity with output sleeve 32, export sleeve 32 to be connected with sprocket wheel 30 rigidity, thus power is through main shaft 1, flat key 3 59, left sleeve 6, controlled ratchet 61, the gear 20 of the number of teeth 46, gear wheel shaft 11, dual gear 23, output gear 45, export sleeve 32, sprocket wheel 30 exports, it is 4 grades.
Five, 5 grades of power transmission lines, with reference to figure 1 and Fig. 8: flat key 3 59 is embedded between the keyway of main shaft 1 and left clutch sleeve 6, the input power of main shaft 1 is passed to the right sleeve 6 of controllable clutch, controlled ratchet 61 is embedded between the ratchet slot of the pawl slot of left clutch sleeve 6 and the gear 8 of the number of teeth 48, can by transmission of power to the gear 8 of the number of teeth 48, gear 8 and the number of teeth on gear wheel shaft 11 of the number of teeth 48 are the gear gears meshing of 12, gear wheel shaft is connected by flat key 1 and dual gear 23 rigidity, right gear and the number of teeth of dual gear 23 be 21 output gear 45 engage, the number of teeth be 21 output gear 45 with export sleeve 32 and be connected by spline rigidity, export sleeve 32 to be connected with sprocket wheel 30 rigidity, thus power is through main shaft 1, flat key 3 59, left clutch sleeve 6, controlled ratchet 61, the gear 8 of the number of teeth 48, gear wheel shaft 11, dual gear 23, the number of teeth is the output gear 45 of 21, export sleeve 32, sprocket wheel 30 exports, it is 5 grades.
Position shown in Fig. 1, pulls without wire-drawing wheel 53, and camshaft 58 corner is 0, and power, through 1 grade of drive path transmission, is direct speed one grade; When making camshaft 58 conter clockwise turn over 40 degree when pulling wire-drawing wheel 53, the right clutch of second group of power-transfer clutch engages, and power, through 2 grades of transfer route transmission, is second gear; When making camshaft 58 conter clockwise turn over 80 degree when pulling wire-drawing wheel 53, the right clutch of first group of power-transfer clutch engages, and power, through 3 grades of transfer route transmission, is third gear; When making camshaft 58 conter clockwise turn over 120 degree when pulling wire-drawing wheel 53, the left clutch of second group of power-transfer clutch engages, and power, through 4 grades of transfer route transmission, is fourth gear; When making camshaft 58 conter clockwise turn over 160 degree when pulling wire-drawing wheel 53, the left clutch of first group of power-transfer clutch combines, and power, through 5 grades of transfer route transmission, is five grades.
Each gear transmitting ratio is as follows:
1 grade: the change-speed box output chain gear number of teeth 70, the trailing wheel input sprocket number of teeth 57, i
1=70/57=1.228;
2 grades: gear 21 number of teeth 39, dual gear left and right tooth tooth number is respectively 21,19, the output gear gear number of teeth 21, i
2=(39/21) × (19/21) × (70/57)=2.06;
3 grades: gear 18 number of teeth 43, the gear wheel shaft number of teeth 17, i
3=(43/17) × (19/21) × (70/57)=2.81;
4 grades: gear 21 number of teeth 46, the gear wheel shaft number of teeth 14, i
3=(46/14) × (19/21) × (70/57)=3.65;
5 grades: gear 8 number of teeth 48, the gear wheel shaft number of teeth 12, i
3=(48/12) × (19/21) × (70/57)=4.44;
The difference of each shelves transmitting ratio is about 0.8, and rider can be allowed all to pedal power to output when shifting gears each time has one to estimate.
From each shelves power transmission route, 1 grade directly outputs to output sleeve 32 by input shaft 1, overriding clutch assembly, the stage clip 60 of two groups of controllable clutch mediates, corresponding fourth speed gear idle running, there is minimum loss due to friction, disregard bearing friction loss, the efficiency of 1 grade is 0.98; For 2,3,4,5 grades all through two-stage gear transmission and one-level Chain conveyer, the efficiency that the gear transmission of 7 class precisions comprises bearing friction is 0.97, and net effciency is 0.97 × 0.97 × 0.98=0.922.
Known by forming of shift control and left and right controllable clutch:
One, stage clip 60 is elastic components, stirs arbitrarily by gearshift assembly, is no matter static, motion, all can stirs stage clip 60 with or without input, achieve the requirement of any time gearshift;
Two, camshaft 58 often turns an angle 40 degree, can only handle a pair controlled ratchet 61 on two groups of controllable clutch, avoid random shelves, ensured by the cam path on camshaft 58, with reference to figure 9;
Three, when being shifted gears to high-speed shelves by low gear, such as 2 grades to 3 grades, camshaft 58 forwards 80 degree of positions to by 40 degree of positions, the stage clip 60 of second group of controllable clutch is pushed midway location, the controlled ratchet 61 of the left part of second group of power-transfer clutch is closed under the effect of wire spring 43, be disengaged, the stage clip 60 of first group of controllable clutch is pushed right position, the controlled ratchet 61 of the right part of first group of power-transfer clutch is upspring at once, engage with the ratchet slot of the gear 18 of the number of teeth 43, because 3 grades of speed are higher than 2 grades of speed, power is at once through 3 grades of transfer route transmission, there is not neutral and step on sky phenomenon,
Four, when high speed gear is shifted gears to low velocity shelves, such as 3 grades to 2 grades, camshaft 58 forwards 40 degree of positions to by 80 degree of positions, the stage clip 60 of second group of controllable clutch is pushed right position, the controlled ratchet 61 of the right part of second group of power-transfer clutch is upspring, engage with the ratchet slot of its corresponding gear, the stage clip 60 of first group of controllable clutch is pushed meta, the controlled ratchet 61 of the right part of first group of power-transfer clutch can not close at once, can not throw off and engage with the ratchet slot of the gear 18 of the number of teeth 43, this is because 3 grades of speed are higher than 2 grades of speed, when there being input torque, friction force is there is between the ratchet slot of the controlled ratchet 61 of the right part of first group of power-transfer clutch and the gear 18 of the number of teeth 43, friction force stops line bullet 43 spring that this ratchet is pressed to make position, friction force is only had to disappear, this ratchet could close, friction force disappears two kinds of situations, one rider does not trample input crank, if its two trample input crank and input crank trampled plumb position, namely time perpendicular to the ground, now torque arm length is 0, without input torque, 3 grades of clicks are disengaged, and second gear click enters joint, realize the switching of 3 grades to 2 grades, there is not neutral and step on sky phenomenon.In other words: if rider shifts gears trampling in process continuously, and shifted gears to low velocity shelves by high speed gear, input shaft has the lag angle of 0 ~ 180 degree to shift gears.Shift gears so at any time, there are not random shelves, with or without shift-variable when input torque, meet very much and drive custom, and there will not be neutral and step on sky phenomenon, avoid gearshift to feel immediately.In shift process, stir stage clip 60, avoid handsetting gear, avoid beating tooth phenomenon, prevent the damage of gear.Gearshift assembly adopts cylindrical cam 58 to add the form of rolling steel balls 55, can improve gearshift sensitieness greatly and reduce actuating force, realizing light gearshift.
With above-mentioned according to desirable embodiment of the present utility model for enlightenment, by above-mentioned description, relevant staff in the scope not departing from this utility model technological thought, can carry out various change and amendment completely.The technical scope of this utility model is not limited to the content on specification sheets, must determine its technical scope according to right.
Claims (5)
1. five grades of miniature gear change-speed boxs, it is characterized in that: there is main shaft (1), the two ends, left and right of main shaft (1) are separately installed with left end cap (3) and right end cap (26), left end cap (3) and right end cap (26) are equipped with cylindrical drum shell (14) jointly, between left end cap (3) and right end cap (26), are arranged with the gear wheel shaft (11) laying respectively at main shaft (1) top and the camshaft (58) being positioned at main shaft (1) below in parallel, main shaft (1) is gone up and is positioned at the gear (8) being arranged with the number of teeth 48 between left end cap (3) and right end cap (26) from left to right successively, left clutch sleeve (6), right clutch sleeve (17), the gear (18) of the number of teeth 43, the gear (20) of the number of teeth 46, left clutch sleeve (6), right clutch sleeve (17), the gear (21) of the number of teeth 39, the number of teeth is output gear (45) and the overrunning clutch sleeve (43) of 21, the periphery of overrunning clutch sleeve (43) is embedded with wire spring (44), left clutch sleeve (6) is provided with left shift fork (15), right clutch sleeve (17) is provided with right shift fork (16), main shaft (1) is also arranged with and is positioned at the outside output sleeve (32) of cylindrical drum shell (14), the outer race exporting sleeve (32) is provided with sprocket wheel (30) and the circular nut (31) for fixed chain wheels (30), export in the endoporus of sleeve (32) and be provided with end cover (34), gear wheel shaft (11) is arranged with the dual gear (23) that the output gear (45) being 21 with the gear (21) of the number of teeth 39 and the number of teeth is respectively meshed, camshaft (58) is symmetrically arranged with two shift fork covers (54), steel ball (55) is provided with between each shift fork cover (54) and camshaft (58), each shift fork cover (54) is connected to the stage clip (60) for compressing left clutch sleeve (6) and right clutch sleeve (17), and the right-hand member of camshaft (58) is arranged with wire-drawing wheel (53).
2. a kind of five grades of miniature gear change-speed boxs according to claim 1, is characterized in that: be provided with two controlled ratchets (61) in the endoporus of the gear (8) of the described number of teeth 48.
3. a kind of five grades of miniature gear change-speed boxs according to claim 1, is characterized in that: described each shift fork cover (54) is all connected with the axis of guide (68).
4. a kind of five grades of miniature gear change-speed boxs according to claim 1, is characterized in that: described wire-drawing wheel (53) is set in the right-hand member of camshaft (58) by flat key (62).
5. a kind of five grades of miniature gear change-speed boxs according to claim 1, is characterized in that: the endoporus of described overrunning clutch sleeve (43) be provided with two match with controlled ratchet (61) often open ratchet (67).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520123868.0U CN204567966U (en) | 2015-03-03 | 2015-03-03 | A kind of five grades of miniature gear change-speed boxs |
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| CN201520123868.0U CN204567966U (en) | 2015-03-03 | 2015-03-03 | A kind of five grades of miniature gear change-speed boxs |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI636916B (en) * | 2016-05-20 | 2018-10-01 | 劍良 陸 | Smart gearing system for bicycle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI636916B (en) * | 2016-05-20 | 2018-10-01 | 劍良 陸 | Smart gearing system for bicycle |
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