CN2389837Y - Variable shaft length gear box for moped - Google Patents

Abstract

The utility model relates to a variable axle length gear box for a moped, which comprises a gear box body provided with a force inputting hole and a force outputting hole. The force inputting hole is used for being penetrated by an inputting gear axle and is in a parallel state with the penetrating force outputting hole. The force outputting hole transversely passes through the gear box body. The inner part of the gear box body is provided with a speed difference gear engaged with the inputting gear axle and driven by the inputting gear axle. An inner part and vertical directions on two ends are respectively provided with a pair of engaged bevel gears. The bevel gears arranged on the two ends are respectively connected with an outputting long axle and an outputting short axle of the gear box in order to respectively connect with a back wheel of the moped. The outputting long axle of the gear box can be changed with the width of a moped body and a gear box cover is arranged under the gear box body.

Description

The electric cycle change speed gear box of variable axial length

The utility model relates to a kind of electric cycle change speed gear box of variable axial length, and it is long and have a gearbox designs that the upper and lower shell body member is torn open, organized particularly to relate to a kind of transmission shaft of adjusting.

Vehicle is an indispensable running vehicle in the daily life, particularly automobile and motor bike, almost become the part of modern's life, yet, because oil-fired vehicles such as motor bike or automobile, the common air pollution problems inherent that exists, so under the trend of doing one's utmost advocating environment protection now, battery-driven car with environmental-protection function also just in response to and given birth to, for example: three-wheel that a kind of feel is seen or the four-wheel electric car of riding instead of walk, because light and easy operating, be subjected to liking of handicapped person or the elderly deeply, and become ride instead of walk the main tool of usefulness of short distance gradually.

In the structure of above-mentioned electric cycle, its topmost dynamic structure, except in order to the motor that power is provided, the gearbox designs of power transmission and speed changing function also will be provided, obviously the gearbox designs of electric cycle does not resemble existing automobile, the change speed gear box of motor bike is so complicated, as shown in figure 19, be the gearbox designs of a typical existing electric cycle, in the following description, number with A and to indicate, wherein, this change speed gear box A comprises a left side, right the hollow housing 1A and the 2A of symmetry mutually are connected with some bolt 3A between the one end, and the other end at this hollow housing 1A and 2A, be provided with an opening 4A and a 5A, can be inserted in an output revolving shaft respectively, and be provided with change-gear set at this hollow housing 1A and 2A inside, general old-fashioned reducing gear is from this left side with belt or chain, the rotating shaft at right two ends connects, forming an enclosed change speed gear box A structure, and present reducing gear machine as shown in figure 19, directly drives differential gear with motor output shaft and rotate.

Yet, with regard to the gearbox designs of above-mentioned existing electric cycle, because it adopts a left side, the hollow housing 1A and the 2A of right symmetry are its main shell, therefore, in processing, need relate to cooperatively interacting of a plurality of planes, therefore its accuracy requirement just improves relatively, cause the processed complex degree to increase, also make its tooling cost higher, for example: make this left side, output shaft opening 4A and 5A on right hollow housing 1A and the 2A will be on same horizocardia axis, so that its left side, right spindle keeps horizontal stable when transmission, the jointing end face of left and right sides housing needs smooth, and its face of joint needs to become suitable fixed angle with the output shaft opening, motor spindle opening 6A needs parallel with the output shaft opening, and must become suitably fixing angle with right shell body, in the time all need controlling its working accuracy, slightly once scrap is arranged accidentally easily, therefore, except the course of processing is more difficult, and in the assembling and replacing process of assembly, also seem difficult relatively, and the problem of noise also profoundly perplexs this kind design.

In addition, electric cycle car type at different overall width and horizontal tread change, directly change a left side if consider with the change speed gear box of original type shape, right either party's output revolving shaft uses so that continue, except the dismounting difficulty of assembly, left side after this is changed, right output revolving shaft, because of again through again assembling, and cannot say for sure that one is positioned on the same horizocardia axis, event can't directly make output revolving shaft with regard to original change speed gear box A or replacement of component is reached, must make this electric cycle overall width of cooperation and lateral wheel change speed gear box separately apart from kenel,, be to be another unfavorable factor on its industry is utilized so that but its elasticity changes is very little.

Moreover the change speed gear box of the left and right sealing combination of above-mentioned existing employing is changed the internal gear assembly except being not easy to tear open, organize, because accuracy rate is relatively poor, therefore this left and right output revolving shaft arbitrarily rocks easily, causes the member wearing and tearing than being easier to, and produces the friction noise.

The purpose of this utility model is to provide a kind of electric cycle change speed gear box of variable axial length, its change speed gear box body is formed as one, and the opening of its left and right output shaft, and motor strength inlet opening, for on same horizontal surface, forming, its working accuracy is improved and make the course of processing simple and direct and cut down finished cost through synchronous processing.

Another purpose of the present utility model is the output shaft opening of its synchronous processing, can guarantee both precision at same horizontal axis, therefore be used in different overall width with same change speed gear box body, or laterally during the electric cycle car type of tread change, can still can guarantee the precision of the horizontal shaft that coexists of its left and right output shaft directly by changing the length of adjusting its left side or right output shaft one side.

A purpose more of the present utility model is to provide a kind of electric cycle change speed gear box of variable axial length, its below has a movable gear shift cover of tearing open, organizing, when the electric cycle car body that changes apart from kenel at different overall width or lateral shaft is used, can make things convenient for its left and right output shaft and other replacement of component, convenient rapid.

The 4th purpose of the present utility model is to provide a kind of electric cycle change speed gear box of variable axial length, be provided with the strength inlet opening of motor spindle input, this hole is parallel with the opening of output shaft, and owing to be subsynchronous parallel processing, therefore except that its precision may command, further, can cooperate the drive motor of changing any kenel to be made up transmission, therefore not influence its degree of precision.

The 5th purpose of the present utility model is to provide a pipe spreader that cooperates, by the position of its positioning control change speed gear box on the vehicle frame of back, change speed gear box can be limited on the vehicle frame of back really, the reason car body is not advanced and is rocked and make change speed gear box produce displacement, guaranteeing the service life of change speed gear box and output shaft thereof, in addition, the electric cycle change speed gear box of this variable axial length, respectively there is a C type fixed plate to be fixed on this left and right output shaft, to stablize the flat smooth and unlikely generation noise that rocks of this output shaft running.

The purpose of this utility model is to realize like this, a kind of electric cycle change speed gear box of variable axial length promptly is provided, it comprises: a change speed gear box body, be provided with a strength inlet opening and run through the hole of exerting oneself, this strength inlet opening inserts the input gear axle that connection one is used for imput power, this runs through the hole of exerting oneself and traverses left and right two ends on same horizontal axis, and runs through between left and right two ends, the hole of exerting oneself at this and to be provided with a room; One gear shift cover is movably connected in the bottom of this change speed gear box body; One differential gear, place the room of gearbox body, and be meshed with this input gear axle, to be subjected to the transmission of input gear axle, and respectively be provided with a storage tank at inner two ends, and installing respectively in conjunction with a bevel gear, the flank of tooth of this bevel gear and the flank of tooth of differential gear are the arrangements of vertical 90 degree, and its rotation direction is vertical 90 rotation directions mutually with the differential gear rotation direction; One change speed gear box output major axis and change speed gear box output minor axis, at one end connect a bevel gear respectively, the other end is connected to the trailing wheel of electric cycle, this bevel gear flank of tooth and with above-mentioned differential gear in the bevel gear flank of tooth be vertical 90 the degree engagements, turned round by the transmission of this differential gear, and its rotation direction and differential gear turn to and are state in the same way; Some C type fixed plates go to upper and lower the bevel gear rear end that fixed form is fixed on this change speed gear box output major axis.Wherein, gear shift cover by this change speed gear box body bottom is torn open, is organized from the gearbox body below, to cooperate different overall width of electric cycle and horizontal tread change, change the change speed gear box output major axis of different length, and by the differential gear transmission, make this change speed gear box output major axis and change speed gear box output minor axis when electric cycle is turned, produce one fast, a slow differential running.

The advantage of the utility model device is, its simple in structure and low cost of manufacture, in the processing and manufacturing process, the crudy that can keep the change speed gear box body at any time, and because gear shift cover is positioned at change speed gear box body below, therefore its offer, process, assembling etc., do not influence the precision of change speed gear box body, and can provide the most simple and convenient spare part to change structure, and the propulsion source connection mode that changeable voltinism is provided, and on power take-off shaft, make firm assembly and fix, more stable in the time of can making it do the differential running operation.

Below in conjunction with accompanying drawing, describe embodiment of the present utility model in detail, wherein:

Fig. 1 is the three-dimensional appearance constructional drawing of the electric cycle change speed gear box of variable axial length of the present utility model, wherein shows and motor bonded assembly structure;

Fig. 2 is a three-dimensional decomposition chart of the present utility model;

Fig. 3 is a front elevation of the present utility model;

Fig. 4 is a front elevation, show this gear shift cover from change speed gear box body below bonded assembly state upwards;

Fig. 5 is a upward view, shows that this gear shift cover is connected in the state of change speed gear box body in the utility model;

Fig. 6 is a bottom view, and change speed gear box output major axis in demonstration the utility model and minor axis are subjected to the state of differential gear transmission simultaneously running;

Fig. 7 is a C-C cutaway view Amplified image among Fig. 6, bevel gear ingear state on interior bevel gear of differential gear and change speed gear box output major axis, the minor axis in demonstration the utility model;

Fig. 8 is that enlarged drawing is looked up in a part, shows that this change speed gear box output major axis one end inserts the interior state of differential gear in the utility model;

Fig. 9 is a partial exploded view, shows the structure of C type fixed plate in the utility model;

Figure 10 is a partial perspective view, shows that C type fixed plate of the present utility model is after combination, without sealed state;

Figure 11 is a partial perspective view, shows that C type fixed plate of the present utility model is after combination, with the sealed state of cross round head bolt;

Figure 12 is a partial perspective view, shows C type fixed plate of the present utility model in assembled state, and after the locking of cross round head bolt, a wing tip of this screw retention sheet is upwards turned up the state of 90 degree;

Figure 13 is a partial perspective view, shows that the utility model C type fixed plate in assembled state, after a wing tip of this screw retention sheet upwards bends 90 degree, bends the groove state that 90 degree snap in cross round head bolt head again;

Figure 14 is a upward view, shows the change speed gear box output major axis in the utility model, the structure that minor axis is subjected to the differential gear transmission;

Figure 15 is a upward view, shows the static or slow-speed of change speed gear box output minor axis in the utility model, the fast differential operative condition that changes of change speed gear box output major axis;

Figure 16 is a part sectional view, shows the static or slow-speed of change speed gear box output minor axis in the utility model, the fast differential operative condition that changes of change speed gear box output major axis;

Figure 17 is a part sectional view, shows the static or slow-speed of change speed gear box output major axis in the utility model, the fast differential operative condition that changes of change speed gear box output minor axis;

Figure 18 is a three-dimensional decomposition chart, and the electric cycle change speed gear box that shows variable axial length of the present utility model is used the state be incorporated into vehicle frame behind the electric cycle;

Figure 19 is the change speed gear box appearance assumption diagram of existing electric cycle.

At first see also Fig. 1～shown in Figure 5, the electric cycle change speed gear box of the variable axial length of the utility model, to call change speed gear box in the following text, and following each graphic in, indicate with 100 numberings, wherein, this change speed gear box 100 comprises a change speed gear box body 10, be hollow form, its face shaping is not limit, offer a strength inlet opening 11 and run through the hole 12 of exerting oneself in horizontal transverse direction, this strength inlet opening 11 with run through the hole 12 of exerting oneself for being parastate (as shown in Figures 2 and 3) mutually, and, strength inlet opening 11 is for the sheathed ball bearing of main shaft 112 of an input gear axle 111 two ends difference, 113, C type clasp 114, bearing catch 115, spring washer 116 and cross round head bolt 117 etc., the cover group is arranged in this strength inlet opening 111, one end of this input gear axle 111 sees through a change speed gear box in flakes 118, one change speed gear box connects lining 119 and is connected with the rotating shaft 1B of a motor B, make this input gear axle 111 be subjected to the transmission of motor B and imput power is given this change speed gear box 100, the above-mentioned hole 12 of exerting oneself of running through is a left side, right level runs through state (as shown in Figure 5), and described change speed gear box body 10 inside are provided with a room 13 (as shown in Figure 6), on above-mentioned 12 left sides, hole of exerting oneself of running through, be provided with a gear shift cover 20 between the right-hand member, be provided with a concave-arc part 21 in inside, room 13 shapes of the above-mentioned change speed gear box body 10 of its form fit constitute, be provided with some holes 22 in the bottom, be locked in the bottom of this change speed gear box body 10 (as Fig. 3 to see through some cross round head bolts 23 and spring washer 24 respectively, Fig. 4 and shown in Figure 5), conveniently tear open from the 10 bottom activities of change speed gear box body, organize the intraware of this change speed gear box body 10.

Please cooperate Fig. 6 again, Fig. 7 and shown in Figure 8, above-mentioned change speed gear box of the present utility model 100 also comprises a differential gear 30, place above-mentioned change speed gear box body 10 inside, run through 12 left sides, hole of exerting oneself, in the room 13 between right two ends (as shown in Figure 6), and be meshed with input gear axle 111 in the strength inlet opening 11 of above-mentioned change speed gear box body 10, and be subjected to the transmission of this input gear axle 111, promptly be subjected to the indirect drive of motor B, and at these differential gear 30 inner two ends, be respectively equipped with a storage tank 31 and 32 (as Fig. 2), on the two side walls of this storage tank 31 and 32, be arranged with a pair of ditch 311 and 321, this storage tank 31 and 32 respectively provides a bevel gear 33 and 34 to install wherein, and this bevel gear 33 and 34 the flank of tooth and the flank of tooth of above-mentioned differential gear 30 are the ordered states of vertical 90 degree, and through lining 331,341 be inserted in the center of bevel gear 33 and 34 after, after traversing this lining 331 and 341 with a square pin 332 and 342 respectively again, snap in respectively on the storage tank 31 of above-mentioned differential gear 30 and the ditch 311 and 321 in 32 the two side (seeing also shown in Figure 6) with the two ends of square pin 332 and 342, make the orthogonal directions that is vertical 90 degree with turning to of this differential gear 30 that turns to of this bevel gear 33 and 34 turns, and this each bevel gear 33,34 more can be at the ditch 311 of differential gear, make cross travel in 321, and do not influence the rotation and the transmission of differential gear set.

One change speed gear box output major axis 40 and change speed gear box output minor axis 50, at both ends respectively is provided with a pin-and-hole 41 respectively, 51, reach combination breach 42 with wheels, 52, this end that is provided with the axle of pin-and- hole 41 and 51 penetrates respectively and is combined with a round pin 43 and 53, and two bevel gears 44 and 54 are arranged in addition, on its back side central authorities two walls, be respectively equipped with a breach 441 and 541, export major axis 40 and change speed gear box output minor axis 50 1 ends institute bonded assembly round pin 43 and 53 two ends for above-mentioned change speed gear box and snap in combination, make this bevel gear 44 and 54 be connected to an end of this change speed gear box output major axis 40 and change speed gear box output minor axis 50, and the part of these change speed gear box output major axis 40 1 ends, slightly pass this bevel gear 44, and see through a flat gasket 45 and penetrate the center (as Figure 6 and Figure 7) of this differential gear 30, and make bevel gear 44,45 opposing parallel are in differential gear 30, and make these bevel gear 44 flank of tooth and the above-mentioned engagements (as shown in Figure 6) that place two bevel gears 33 in the differential gear 30 and 34 the side flank of tooth to be 90 degree further, similarly, the flank of tooth of the bevel gear 54 on this change speed gear box output minor axis 50 1 end limits also in like manner is 90 degree engagements with the flank of tooth of this bevel gear 33 and 34 1 sides, institute's difference, this end that promptly is this change speed gear box output minor axis 50 does not penetrate the center of this differential gear 30 (as Fig. 6, Fig. 7 and shown in Figure 8), by each above unit construction, make this bevel gear 44 and 54 still be subjected to the indirect drive of differential gear 30, its rotation direction is identical turning to this differential gear 30, even this change speed gear box output major axis 40 and change speed gear box output minor axis 50 are subjected to the transmission of this differential gear 30 and outputting power.

Please consult Fig. 9～shown in Figure 13 again, after above-mentioned change speed gear box output major axis 40 is engaged to differential gear 30 by this bevel gear 44, on this position, bevel gear 44 rear end, the lower end is combined with a pair of C type fixed plate 60 respectively, the two ends of each C type fixed plate 60 are respectively equipped with a perforation 61 and a screw 62, and at the two ends of end face 63, establish a catching groove 631 respectively, at this a pair of C type fixed plate 60 from this change speed gear box output major axis 40, when make up the lower end, seeing through a cross round head bolt 64 and a screw retention sheet 65 locks, promptly pass perforation 61 screw locks on screw 62 with this cross round head bolt 64, and this cross round head bolt 64 is provided with two grooves 641, this two groove 641 is right-angled crossing, screw retention sheet 65 at both endss respectively are provided with a fin 651, the fin 651 of this end is at cross dome bolt 64 screw locks during in C type fixed plate 60, correspondence is inserted in the catching groove 631 of end face 63 of above-mentioned C type fixed plate 60 (as Fig. 9 and shown in Figure 10), and be locked on this at this cross round head bolt 64, behind following two C type fixed plates 60, this fin 651 is upwards turned up 90 degree (as shown in figure 11) in advance, again this fin 651 is oppositely bent 90 degree with in the groove 641 that buckles into above-mentioned cross round head bolt 64, make this cross round head bolt 64 unlikely getting loose when being locked together in this C type fixed plate 60, reach the purpose that prevents that mechanical shock from coming off, and after the end locking of C type fixed plate 60, can stir C type fixed plate group by screw driver, make it after major axis rotates 180 degree, again according to an end of the same manner locking C type fixed plate.

Before above-mentioned C type fixed plate 60 is fixed, pass the Needle bearing 67 that has been preset in the hole of exerting oneself earlier at this change speed gear box output major axis 40, and anti-dust seal 68, overlap again with a flat gasket 66, make this change speed gear box output major axis 40 and change speed gear box output minor axis 50 leak-tight joints in this change speed gear box body 10, and seal the left and right two ends (as shown in Figure 6) that this runs through the hole 12 of exerting oneself respectively by this anti-dust seal 68.

Please consult Figure 14～shown in Figure 17 again, above-mentioned Fig. 1～change speed gear box 100 structures of the present utility model shown in Figure 13, on reality is made, can be owing to the strength inlet opening in this change speed gear box body 10 11 is a parastate with running through the hole 12 of exerting oneself, make this change speed gear box body 10 in processing, only doing the same side parallel processing synchronously gets final product, can improve its working accuracy, and, because running through the hole 12 of exerting oneself is with a left side, what the right side was run through processes at one time, therefore can guarantee that this runs through the concentric precision of hole 12 horizontal axiss of exerting oneself, strength inlet opening 11 be arranged in parallel with the hole 12 of exerting oneself, can make things convenient for the be connected motor B propulsion source of various different kenels of this change speed gear box body 10; And in the transmission operation, this motor B is engaged in this differential gear 30 via above-mentioned input gear axle 111, make differential gear 30 runnings, further by this bevel gear 33 and 34 transmission bevel gears 44 and 54, make this change speed gear box output major axis 40 and change speed gear box output minor axis 50 produce running (shown in the direction of arrow among Figure 14), so that electric cycle obtains power, its detailed application state will be hereinafter will describe in detail.

When this change speed gear box output major axis 40 and change speed gear box output minor axis 50 when doing the differential running operation, as Figure 15 and state shown in Figure 16, because this left side bevel gear 54 does not rotate, or rotating speed is slack-off, this moment and its ingear bevel gear 33,34 influenced by it, after contact that some engagements have some setbacks takes place, be nested with at bevel gear 33, square pin 332 on 34,342 just can displacement in the ditch 311,321 of differential gear 30, under this kind situation, bevel gear 33,34 can press close to (shown in the direction of arrow among Figure 16) to the direction of change speed gear box output major axis 40, and separate with the bevel gear 54 in left side, at this moment, this change speed gear box major axis 40 is the state of fast turn-around transmission (shown in the direction of arrow among Figure 16 and Figure 16), relatively, this change speed gear box output minor axis 50 presents to be almost and stops or the state of microrunning, locks this change speed gear box output major axis 40 admittedly by above-mentioned Fig. 9～C type fixed plate 60 of the present utility model shown in Figure 13, in the time of can making this change speed gear box output major axis 40 do the differential running, more stable.

Otherwise, when change speed gear box output minor axis 50 is done the differential running, promptly this change speed gear box output minor axis 50 is done fast turn-around, this change speed gear box output major axis 40 is almost stopping or during microrunning, same this each bevel gear 33,34 also press close to (shown in the direction of arrow among Figure 17) to these change speed gear box output minor axis 50 directions, make this change speed gear box output minor axis 50 do differential running (as shown in figure 17), and the above Figure 15～change speed gear box output major axis 40 shown in Figure 17 and the differential running action of change speed gear box output minor axis 50, for being used to make the state of electric cycle in the operation of turning, can directly provide this function by this change speed gear box 100, need not to install additional again other spare part, and then the power design and the manufacturing cost of reduction electric cycle, and improve its industry applications.

Please cooperate shown in Figure 180 again, above-mentioned Fig. 1～change speed gear box 100 of the present utility model shown in Figure 17 is in practical application, be connected in the back-wheel drive mechanism of electric cycle, in Figure 18, disclosed a preferred application examples state, promptly this change speed gear box 100 is fixed on the vehicle frame 200 of back, be fixed on the vehicle frame 200 of back by a change speed gear box fixed plate 210 and sticking belt 220, and should be the connection (not shown) mutually with front vehicle frame by the vehicle frame 200 usefulness a pair of connection tip 230 in back, and this back vehicle frame 200 has anti-tip wheel 240, anti-dumping wheel carrier 241 and 242, flat gasket 243 and mouthful pin 244 anti-dumping Slipped Clove Hitch structures that constituted, and, this change speed gear box output major axis 40 is nested with a pipe spreader 250 and reaches at the sheathed change speed gear box fixed hub 251 of this end, Needle bearing 252, anti-dust seal 253, and be combined with a change speed gear box shock ring 254 and change speed gear box fixed plate 255 respectively at the end of this change speed gear box output major axis 40 and change speed gear box output minor axis 50, and this change speed gear box fixed plate 255 usefulness one outer-hexagonal steel bolt 256, flat gasket 257, spring washer 258 and nylon nut 259 are locked fixing, the combination breach 42 and 52 of this change speed gear box output major axis 40 and change speed gear box output minor axis 50 ends connects a trailing wheel 260 respectively, but so that this change speed gear box output major axis 40 and 260 runnings of change speed gear box output minor axis 50 transmission trailing wheels, and produce above-mentioned Figure 14～differential function of motion shown in Figure 17 in the running, what need explanation again is, central siphon cover 250 is except that in order to dustproof, and has adjusting control change speed gear box 100 in back vehicle frame positioning function, central siphon cover 250 is enclosed within on the major axis, its length is to be limited in change speed gear box fixed hub 251 and exert oneself between the hole 12 in the change speed gear box right side, be that change speed gear box 100 is locked behind the vehicle frame of back, length by central siphon cover 250 is limited at the hole 12 of exerting oneself, the right side, and between the change speed gear box fixed hub 251, therefore change speed gear box is between car body is advanced, to not have any generation of rocking, can this more prolong the service life of change speed gear box, and the precision of raising output shaft, reduce the generation of noise.

Application state as shown in figure 18, change speed gear box 100 structures of the present utility model, but on using except that direct convenience be incorporated into the driving structure of rear wheel of electric cycle, when being applied to the electric cycle of different overall width and lateral wheel distance, after can directly taking apart by the gear shift cover 20 of these change speed gear box body 10 bottoms, directly drive cross round head bolt on the C type fixed plate with the screw driver pine, can be by the round pin 43 on the change speed gear box body 10 inner directly dismounting major axis 40, and by outside the hole of exerting oneself major axis 40 being extracted out, to change long or short change speed gear box output major axis 40, oppositely C type fixed plate is locked again again, and the central siphon cover 250 of changing corresponding cooperation gets final product, make under change speed gear box body 10 states of using with a kind of kenel and structure, can make the electric cycle of its application extension in various different overall width and horizontal tread change, identical, at different horsepower outputs, the motor of replaceable different size, and, after changing the change speed gear box output major axis 40 of different length, can make 50 of this change speed gear box output major axis 40 and change speed gear box output minor axises, still keep identical same accurately horizontal axis line precision, the cost of electric cycle production be can significantly reduce, and the changeability and the comformability of its product improved.

Claims (15)

1. the electric cycle change speed gear box of a variable axial length, it is characterized in that, it comprises: a change speed gear box body, be provided with a strength inlet opening and run through the hole of exerting oneself, described strength inlet opening inserts the input gear axle that connection one is used for imput power, left and right two ends are traversed on same horizontal axis in the described hole of exerting oneself of running through, and are provided with a room in described running through between left and right two ends, the hole of exerting oneself; One gear shift cover is movably connected in the bottom of described change speed gear box body; One differential gear, place the room of gearbox body, and be meshed with described input gear axle, to be subjected to the transmission of input gear axle, and respectively be provided with a storage tank at inner two ends, and installing respectively in conjunction with a bevel gear, the flank of tooth of described bevel gear and the flank of tooth of differential gear are the arrangements of vertical 90 degree, and its rotation direction is vertical 90 rotation directions mutually with the differential gear rotation direction; One change speed gear box output major axis and change speed gear box output minor axis, at one end connect a bevel gear respectively, the other end is connected to the trailing wheel of electric cycle, the described bevel gear flank of tooth and the bevel gear flank of tooth in the described differential gear are the engagements of vertical 90 degree, turned round by the transmission of described differential gear, and its rotation direction and differential gear turn to and are state in the same way; Some C type fixed plates go to upper and lower the bevel gear rear end that fixed form is fixed on described change speed gear box output major axis.

2. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, the strength inlet opening of described change speed gear box body with run through the hole of exerting oneself for being parastate.

3. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, described change speed gear box body input gear axle is connected in a motor shaft.

4. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, described gear shift cover is provided with the concave-arc part of the intrinsic room shape of a described change speed gear box of cooperation.

5. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, described gear shift cover is provided with in the bottom surface for the some holes that are locked on described change speed gear box body bottom.

6. the electric cycle change speed gear box of variable axial length as claimed in claim 5 is characterized in that, the hole of described gear shift cover sees through the bottom that some round head bolts are locked on the change speed gear box body.

7. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, the storage tank two side of described differential gear is respectively equipped with a pair of ditch; And some linings and square pin are socketed on two bevel gears in the differential gear, and described square pin two ends snap in the ditch of described storage tank two side.

8. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, described change speed gear box output major axis is respectively equipped with one in order to see through the pin-and-hole that a round pin is connected bevel gear with an end of change speed gear box output minor axis.

9. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, an end of described change speed gear box output major axis and change speed gear box output minor axis is respectively equipped with one in order to be connected to the combination breach of electric walk instead back wheels of vehicle.

10. the electric cycle change speed gear box of variable axial length as claimed in claim 1, it is characterized in that an end of described change speed gear box output major axis and change speed gear box output minor axis is respectively equipped with some Needle bearings, flat gasket and anti-dust seal so that described change speed gear box output major axis and change speed gear box output minor axis are combined closely in described gearbox body.

11. the electric cycle change speed gear box of variable axial length as claimed in claim 1 is characterized in that, described C type fixed plate two ends respectively are provided with one and pass and make upper and lower sealed perforation and screw for seeing through a cross round head bolt.

12. the electric cycle change speed gear box of variable axial length as claimed in claim 11 is characterized in that, described cross round head bolt sees through a screw retention mortice lock and is bonded on the described C type fixed plate.

13. the electric cycle change speed gear box as claim 11,12 described variable axial lengths is characterized in that, the end face two ends of described C type fixed plate are respectively equipped with a catching groove; And described screw retention sheet at both ends is respectively equipped with one for the fin that snaps in the described catching groove.

14. the electric cycle change speed gear box as claim 11,12 described variable axial lengths is characterized in that, described screw retention sheet is respectively equipped with a fin in two ends; And described cross round head bolt top is provided with the groove that the described screw retention sheet one end bending of a pair of confession buckles into.

15. the electric cycle change speed gear box of variable axial length as claimed in claim 14 is characterized in that, the groove at described cross round head bolt top is " ten " word and intersects.

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