CN1524760A

CN1524760A - Automatic continuously variable chain disk device

Info

Publication number: CN1524760A
Application number: CNA031173527A
Authority: CN
Inventors: 余蜀翔
Original assignee: Individual
Current assignee: Individual
Priority date: 2003-02-26
Filing date: 2003-02-26
Publication date: 2004-09-01
Anticipated expiration: 2023-02-26
Also published as: CN100402369C

Abstract

The invention is an automatic stepless speed change chain-disc device, composed of several variable-axis distance chain wheels 13-18 linked with the balance springs 1-12 and the chain wheel positioners 19-25; these positioners periodically position (teeth engaging) and release the chain wheels; when the chain wheels 13-15 are released, they change the axis distances R1, R2 and R3 under the action of tension of the rack and elastic force of the balance springs; the axis distances R4, R5 and R6 can not be changed; the positioned chain wheels 16-18 rotate forward with the chain disc to drive the rack 26 to move and do work, thus completing the tasks of automatic stepless regulation and locking driven radius of the chain disc.

Description

The automatic stepless speed change chain guard device

The present invention relates to a kind of chain transferring power device, especially chain transferring power device fields such as the bicycle that constitutes by chain drum, chain, flywheel, three-wheel vehicle.

The chain transferring power device of bicycle, can be divided into fixed conveyor scalable transmitting ratio two classes when, the former chain drum and flywheel are to arrange in pairs or groups one to one, transmitting ratio is fixed, and the latter generally has 1～3 chain drum and 2～6 to fly tooth, the bicyclist as required, the manual control change-speed box is selected suitable chain drum and flywheel collocation, changes transmitting ratio, realizes hand gear.The shortcoming of hand gear has 4: 1, must use manual manipulation; 2, speed change is property step by step, can not the jumping characteristic speed change; Change-speed box can not be worked when 3, chain tension was excessive, and operation can damage change-speed box by force; 4, can not be under 0 speed and low speed speed change; Automatic speed-changing chain guard device, the patent No.: 93239444.2 adopt main chain dish, secondary chain drum, balance spring, sprocket wheel complex structure, main chain dish and balance spring offer sprocket wheel and change distance of shaft centers, sprocket wheel complex and secondary chain drum play a part sway chain wheel distance of shaft centers, because of secondary chain drum chute number pre-establishes, the variation numerical value that defines chain drum driving radius is secondary chain drum chute number, has been a grade automatically speed-varying chain wheel unit.

Purpose of the present invention, provide a kind of with the driving change in resistance, the automatic stepless speed change chain guard device that automatic stepless is regulated, the locking chain drum drives radius.

Order of the present invention ground is to realize like this, sprocket wheel, the sprocket wheel chute, balance spring, the sprocket shaft tooth, tooth bar, the tooth bar spring, the automatic stepless speed change chain guard device that the tooth bar zip constitutes: balance spring links to each other with sprocket wheel, the sprocket wheel chute provides dragging track for sprocket wheel, behind the release sprocket wheel and chain interlock in the sprocket wheel chute, constitute the chain drum effective radius, after being chain and the interlock of release sprocket wheel, chain tension and the antagonism of balance spring elastic force are in sprocket wheel, chain tension is during greater than balance spring elastic force, balance spring elastic force deposit, the release sprocket wheel slides to the chain drum axle center along the sprocket wheel chute, finally can reach the sprocket wheel chute and entad hold (inner terminal), the chain drum effective radius is minimum, when chain tension reduces, balance spring elastic force discharges, the release sprocket wheel deviates from the chain drum axle center along the sprocket wheel chute and slides, and finally can reach the centrifugal end of sprocket wheel chute (outermost end), the chain drum effective radius reaches maximum; At chain drum forward in the process of continuous rotation, periodically locking and the release of tooth bar zip, tooth bar spring be elastic force deposit and elastic force discharges, tooth bar periodically separates with the sprocket shaft tooth and engagement, sprocket wheel release and locking, chain drum effective radius and chain drum driving radius checker periodically periodically periodically, constitute chain drum and drive radius, be locked in sprocket wheel in the sprocket wheel chute and drive chain and overcome car resistance and move, finish the task that automatic stepless is regulated, the locking chain drum drives radius thus;

Car body part that the tooth bar zip is substantially by " operation portion "---chain disc portion (the tooth bar zip is held portion, is called for short the portion of holding, down with) and " stationary part "---(tooth bar zip system portion, be called for short system portion, down with) is formed; Forward in the rotating process, hold periodically mutual action of portion and system portion at chain drum, realize periodic locking of tooth bar zip and release, finish the task that automatic stepless is regulated, the locking chain drum drives radius;

The tooth bar zip can be divided into phase locking-type, self-locking type and other formula according to release, locking mode difference:

Phase locking-type tooth bar zip is meant that at chain drum system portion dials and draws the locking that the portion of holding realizes the tooth bar zip forward in the rotating process, and system portion dials and draws after the portion of holding stops tooth bar zip automatic unlocking;

Self-locking type tooth bar zip is meant that at chain drum system portion dials and draws a locking and the release that the portion of holding realizes the tooth bar zip forward in the rotating process, and promptly the I of system portion dials to draw and holds the locking that the I of portion realizes the tooth bar zip, and the II of system portion dials to draw and holds the release that the II of portion realizes the tooth bar zip;

The tooth bar zip can be divided into level type, slide plate type and other type according to the specific constructive form difference:

Level type tooth bar zip is meant near back along being fulcrum the stage casing, settling lever construction with the sprocket wheel chute, lever moving arm (promptly holding portion) protrudes from chain drum periphery circular arc top, the lever resistance arm is connected with a back formula tooth bar sliding by resistance is protruding, perhaps (with) resistance arm links to each other with anteposition formula tooth bar by stay cord, fixed pulley;

Slide plate type tooth bar zip is meant near the chain drum outer rim to be fulcrum, arrangement slide vane structure, slide plate one end (promptly holding portion) protrudes from chain drum periphery circular arc top, slide plate is connected with a back formula tooth bar sliding by resistance is protruding, perhaps (with) slide plate links to each other with anteposition formula tooth bar by stay cord, fixed pulley;

Tooth bar zip change-speed box settles the form difference can be divided into anteposition formula, back position formula and double-disk according to tooth bar:

The anteposition formula is meant the forward position that tooth bar is placed in the sprocket shaft tooth, and position, back formula is meant the back edge that tooth bar is placed in the sprocket shaft tooth, and double-disk promptly is to settle tooth bar simultaneously in the forward position of sprocket shaft tooth and edge, back; Tooth bar links to each other with the tooth bar spring, the tooth bar spring force impel the anteposition formula or (with) back position formula tooth bar meshes with the sprocket shaft tooth, with the sprocket wheel locking; Anteposition formula or position, back formula tooth bar zip change-speed box all can play the locking effect to sprocket wheel, this locking effect is unidirectional, incomplete, be that sprocket wheel might be from the counter-rotation of locking, but structure is simple relatively, be applicable to light-duty vehicle such as bicycle, carriage for children, also be applicable to three-wheel vehicle, boosted vehicle etc.; Double-disk tooth bar zip change-speed box can overcome above-mentioned situation, can be with the complete locking of sprocket wheel, be better than one chip (anteposition formula or position, back formula) tooth bar zip change-speed box speed change accuracy rate, stability, fatigue resistance and the service life of double-disk tooth bar zip change-speed box, be applicable to bicycle, carriage for children, the while also is applicable to the chain-driving machinery in heavy-duty vehicle such as three-wheel vehicle, boosted vehicle and the special place etc.;

The present invention can be divided into one-sided type tooth bar zip change-speed box, bilateral type tooth bar zip change-speed box, mixed type tooth bar zip change-speed box according to tooth bar zip distribution form difference; One-sided type tooth bar zip change-speed box is meant that the side at sprocket wheel is provided with sprocket shaft tooth, tooth bar, tooth bar spring and tooth bar zip; Bilateral type tooth bar zip change-speed box is meant in the both sides of sprocket wheel sprocket shaft tooth, tooth bar, tooth bar spring and tooth bar zip is set simultaneously; Mixed type tooth bar zip change-speed box is meant that the bilateral at the one-sided and a part of sprocket wheel of a part of sprocket wheel is provided with sprocket shaft tooth, tooth bar, tooth bar spring and tooth bar zip;

It can be identical that the tooth bar of one-sided type tooth bar zip change-speed box is settled form, also can be inequality; The tooth bar zip specific constructive form of one-sided type tooth bar zip change-speed box can be identical, also can be inequality;

Two one-sided type tooth bar zip change-speed boxs in the bilateral type tooth bar zip change-speed box can be identical, also can be inequality, are convenient to adapt to better various field of employment; Be better than one-sided type tooth bar zip change-speed box stability, fatigue resistance and the service life of bilateral type tooth bar zip change-speed box; Locking, the release mode of bilateral type tooth bar zip change-speed box can be identical, also can be inequality;

Mixed type tooth bar zip change-speed box promptly is the array configuration of one-sided type tooth bar zip change-speed box and bilateral type tooth bar zip change-speed box;

Lever/slide plate type phase locking-type tooth bar zip principle of work:

The lever that protrudes from chain drum periphery circular arc top (portion of holding separates lock-bit) in the tooth bar zip structure hold portion or (with) slide plate holds portion---" operation portion ", keep relative static relation with chain drum in the rotating process forward at chain drum, when it moves to " stationary part "---when being placed in the system portion on the vehicle body, stopped by system portion and dial and draw, lever hold portion or (and) slide plate holds and occurs relativism displacement between portion and the chain drum periphery circular arc, pushed back chain drum periphery circular arc until the portion of holding by system portion and hold (holding portion locking position) to the greatest extent, the portion of holding is protruding by resistance in shifting process, the sliding connection structure, overcome the tooth bar spring force, stirring position, back tooth bar separates with the sprocket shaft tooth, sprocket wheel is release thus, perhaps (with) pass through stay cord, the fixed pulley structure, overcome the tooth bar spring force, pulling anteposition tooth bar separates with the sprocket shaft tooth, sprocket wheel is release thus, realizes the locking of tooth bar zip; After the portion of holding moves out of system portion, system portion to lever hold portion or (with) the slide plate squeezing action of holding portion disappears, the tooth bar spring force discharges, impel back position tooth bar and the engagement of sprocket shaft tooth, with the sprocket wheel locking, simultaneously by the sliding connection structure, resistance is protruding, impel lever hold portion or (with) the slide plate portion of holding gets back to the portion of holding and separates lock-bit (chain drum periphery circular arc top), perhaps (with) release of tooth bar spring force, impel the engagement of anteposition tooth bar and sprocket shaft tooth, with the sprocket wheel locking, pass through stay cord simultaneously, the fixed pulley structure, impel lever hold portion or (with) the slide plate portion of holding gets back to the portion of holding and separates lock-bit (chain drum periphery circular arc top), realize the release of tooth bar zip, thus circulation, finish stepless release and stepless locking to the chain drum effective radius;

Lever/slide plate type self-locking type tooth bar zip principle of work:

The lever that protrudes from chain drum periphery circular arc top (the portion I of holding separates lock-bit) in the tooth bar zip structure hold the I of portion or (with) slide plate holds the I of portion---" I of operation portion " (is referred to as and holds the I of portion, down together), keep relative static relation with chain drum in the rotating process forward at chain drum, when it moves to " stationary part I "---when being placed in the I of system portion on the vehicle body, stopped by the I of system portion and dial and draw, lever hold the I of portion or (and) slide plate holds and occurs relativism displacement between I of portion and the chain drum periphery circular arc, dialled to draw by the portion I of system and push back chain drum periphery circular arc and hold (holding portion I locking position) to locate to the greatest extent until holding the I of portion, meanwhile, under the I of system portion effect, the portion I of holding dials the II of the portion of holding that scratches on the chain drum---and the II of portion locking is held in " II of operation portion " back, in the process of holding the I of portion displacement, it is protruding by resistance to hold the I of portion, the sliding connection structure, overcome the tooth bar spring force, stirring position, back tooth bar separates with the sprocket shaft tooth, sprocket wheel is release thus, perhaps (with) pass through stay cord, the fixed pulley structure, overcome the tooth bar spring force, pulling anteposition tooth bar separates with the sprocket shaft tooth, sprocket wheel is release thus, realizes the locking of tooth bar zip; Along with chain drum rotates forward, " II's " stationary part II "---II of system portion dials to draw and holds the II of portion---of operation portion " unblanks, the tooth bar spring force discharges, impel back position tooth bar and the engagement of sprocket shaft tooth, with the sprocket wheel locking, simultaneously by the sliding connection structure, resistance is protruding, impel lever hold the I of portion or (with) slide plate holds the I of portion and gets back to the portion I of holding and separate lock-bit (chain drum periphery circular arc top), perhaps (with) release of tooth bar spring force, impel the engagement of anteposition tooth bar and sprocket shaft tooth, with the sprocket wheel locking, pass through stay cord simultaneously, the fixed pulley structure, impel lever hold the I of portion or (with) slide plate holds the I of portion and gets back to the portion I of holding and separate lock-bit (chain drum periphery circular arc top), realize the release of tooth bar zip, thus circulation, finish stepless release and stepless locking to the chain drum effective radius.

The present invention is because adopted power (foot-operated power) and car resistance (chain tension) antagonism, cause balance spring passive stressed (elastic force deposit) or automatically reply (elastic force release), chain drum effective radius automatic stepless changes, after the release of tooth bar zip, the tooth bar spring force discharges, impel the engagement of tooth bar and sprocket shaft tooth, to be subjected to the car resistance variable effect, automatically the release sprocket wheel that has changed distance of shaft centers is locked in a certain distance of shaft centers of sprocket wheel chute place, the locking sprocket wheel rotates the drive chain forward with chain drum and overcomes the speed change mechanism that car resistance moves, manual control structure and M/C have been saved, whole speed change programs are blended in the foot-operated action, have improved the quality of riding; ZL93239444.2 compares with patent, stepless locking by sprocket shaft tooth, tooth bar, tooth bar spring, the enforcement of tooth bar zip to the chain drum effective radius, strengthened speed change comformability and speed change accuracy rate, reduced expenditure of energy, traveling comfort is improved, it is a significantly substantive progress, also letter is in the former for its structure simultaneously, and productive costs significantly reduces.

Concrete structure of the present invention is provided by following embodiment and accompanying drawing thereof:

Fig. 1, be chain drum mainboard structure, assembling and principle of work scheme drawing

Fig. 2, be sprocket wheel, sprocket shaft tooth, counter spring structure, assembling and principle of work scheme drawing

Fig. 3, be one-sided type lever/slide plate type phase locking-type tooth bar zip speed changer structure and principle of work scheme drawing

Fig. 4, be one-sided type lever/slide plate type self-locking type tooth bar zip speed changer structure and principle of work scheme drawing

Below, in conjunction with the embodiments and accompanying drawing describe concrete structure of the present invention and service condition thereof in detail

With reference to Fig. 1:

fix screw

3,4,5,6,7,8,9,10,11,12,13,14 pass fixed

orifice

15,16,17,18,19,20,21,22,23,24,25,26 with

chain drum mainboard

1,2 are fixed in the screw 28 of

bottom bracket axle

27,29,30,31,32, in 33, axis 34 passes chain drum mainboard 1 mesopore 35, bottom bracket axle 27 and chain drum mainboard 2 mesopores 36, axis 34 and bottom bracket axle 27 are by oppositely being spirally connected 37,38 are connected as a single entity, middle axle bumper 39 is fitted with chain drum mainboard 1, be the termination that oppositely is spirally connected, pin handle 40 and middle crown of roll 41 are chimeric, fix screw 42 passes fixed orifice 43 and is spirally connected 44 with axis, when pin handle 40 when (direction shown in the arrow among the figure) rotates forward,

chain drum mainboard

1,2 rotate forward simultaneously;

With reference to Fig. 1, with reference to Fig. 2: sprocket shaft tooth axle 58 passes the sprocket wheel chute hole 48 on the chain drum mainboard 2, pass sprocket wheel mesopore 47, passing sprocket wheel chute hole 46 on the chain drum mainboard 1 passes sprocket shaft tooth mesopore 49 and is spirally connected 51 with hold-doun nut 50,52, sprocket shaft tooth 57 and sprocket shaft tooth axle chimeric 49,54, sprocket wheel 55 and sprocket shaft tooth axle chimeric 47,56, sprocket shaft tooth 57,58 pillow blocks 59,60 with the sprocket wheel chute hole along 61,62 contact, and can be along its surperficial art skating, it is

sprocket wheel chute

46,61,48,62 provide dragging track for sprocket wheel 55, when sprocket wheel slided along the sprocket wheel chute, the chain drum effective radius changed thereupon; Balance spring 63,64 links to each other 51,65,66 with sprocket shaft tooth axle 58, back-up ring 67 is inserted in 68,51, collar 69 location 70,45 prevents that balance spring 63,64 from skidding off, and balance spring 63,64 other ends (centrifugal end) 71,72 links to each other with

balance spring post

73,74 on the chain drum mainboard 1; With reference to Fig. 2, with reference to Fig. 3, with reference to Fig. 1: fix screw 75

passes balance spring

76,77 hanging holes 78,79 and sprocket shaft tooth axle is spirally connected 80,81, the other end (centrifugal end) 82,83 links to each other with

balance spring post

84,85 on the chain drum mainboard 2, when static, balance spring 63,64 (do not draw among Fig. 3, descend together), 76,77 elastic force impel sprocket wheel 55 to be positioned at the centrifugal end 86 of sprocket wheel chute (outermost end), when sprocket wheel 55 was moved into the sprocket wheel chute and entad holds 87 (inner terminals),

balance spring

63,64,76,77 elastic force deposits reached maxim 88,89; Sprocket wheel on the

chain drum mainboard

1,2 in all the other sprocket wheel chutes, sprocket shaft tooth, counter spring structure, assembling and service condition (down together) same as described above; With reference to Fig. 3: for one-sided type change-speed box, the cooresponding tooth bar of sprocket shaft tooth, tooth bar spring and the tooth bar zip (back is described in detail) in the chain drum mainboard 1 side chain wheel chute can be saved, also the sprocket shaft tooth directly can be reduced to the frustum cone structure of easy processing;

With reference to Fig. 3, with reference to Fig. 1: hold

portion

91,92,93,94,95,96 are placed on the chain drum mainboard 2, be in chain drum periphery circular arc top (portion of holding separates lock-bit), be respectively slide plate type double-disk (anteposition formula+position, back formula), slide plate type anteposition formula, level type double-disk (anteposition formula+position, back formula), level type anteposition formula, position formula behind the level type, the formula tooth bar zip portion of holding in position [combines different tooth bars and settles form (anteposition formula behind the slide plate type among Fig. 3, position, back formula, double-disk) and specific constructive form difference (level type, the slide plate type) one-sided type phase locking-type tooth bar zip change-speed box, describe variety of the present invention in detail, can be according to the actual requirements when implementing, select wherein comparatively suitable tooth bar arrangement form and comparatively easily specific constructive form finish the task of tooth bar zip];

Hold portion

91,92,93,94,95,96 rotate forward at chain drum in the process of (direction shown in the arrow among the figure) and keep relative static relation with chain drum mainboard 2, when it moves to the tooth bar zip system portion 90 that is placed on the vehicle frame, stopped by system portion 90 one by one and dial to draw according to sequencing, make and occur the relativism displacement between the portion of holding and the chain drum periphery circular arc, until the portion of

holding

91,92,93,94,95,96 are pushed back chain drum periphery circular arc for 90 groups strokes by system portion holds (holding portion locking position) 103 to the greatest extent, 104,105,106,107,108, wherein slide plate is held portion 91,92,96 by fulcrum 97,98,102 slide, lever is held

portion

93,94,95 by fulcrum 99,100,101 swings, the portion of holding is in the process of displacement, by resistance protruding 109,110,111,112 sliding connecting structures 113,114,115,116 overcome tooth bar spring 117,118,119,120 elastic force, stir position, back tooth bar 121,122,123,124 to locking position 125,126,127,128, by stay cord 129,130,131,132 fixed pulley structures 133,134,135,136,137,138 overcome tooth bar spring 117,139,118,140 elastic force, pulling anteposition tooth bar 141,142,143,144 to locking position 145,146,147,148, thus, tooth bar separates with the sprocket shaft tooth, the sprocket wheel release, the locking of realization phase locking-type tooth bar zip; When the tooth bar zip is held portion 103,104,105,106,107,108 when moving out of tooth bar zip system portion 90, portion 103 is held by 90 pairs in system portion, 104,105,106,107,108 squeezing action disappears, tooth bar spring 149,150,151,152,153,154 elastic force discharge and impel tooth bar 145,125,146,147,126,148,127,128 with sprocket shaft tooth engagement 141,121,142,143,122,144,123,124 sprocket wheels are locking thus, hold portion 103 simultaneously, 104,105,106,107,108 at tooth bar spring 149,150,151,152,153,154 elastic force effects are down by the converse slip of above-mentioned dependency structure, swing, hold (holding portion locking position) to get back to chain drum periphery circular arc top (portion of holding separates lock-bit) 91 heavily again to the greatest extent by chain drum periphery circular arc, 92,93,94,95,96, the release thus of phase locking-type tooth bar zip moves in circles thus, finish the task that automatic stepless locking chain drum drives radius; One-sided type phase locking-type tooth bar zip speed changer structure also can be unified to be placed on the chain drum mainboard 1 except that can unifying to be placed on the chain drum mainboard 2, can also interlock be placed on the chain drum mainboard 2 and chain drum mainboard 1 on; Bilateral type phase locking-type tooth bar zip speed changer structure is promptly settled one-sided type phase locking-type tooth bar zip change-speed box identical or inequality simultaneously at chain drum mainboard bilateral;

With reference to Fig. 4: the one-sided type self-locking type tooth bar zip change-speed box that combines specific constructive form difference (level type, slide plate type) among Fig. 4, tooth bar settles form (anteposition formula, position, back formula, double-disk) with reference to Fig. 3, describe variety of the present invention in detail, the difference that when implementing, can require according to reality, select wherein comparatively suitable tooth bar arrangement form and comparatively easily specific constructive form finish the task of tooth bar zip;

With reference to Fig. 4: structure is identical with lever/slide plate type phase locking-type tooth bar zip change-speed box (compares with Fig. 3 for the sprocket shaft tooth of lever among Fig. 4/slide plate type self-locking type tooth bar zip change-speed box, tooth bar, tooth bar spring, stay cord, fixed pulley etc., saved dependency structure among Fig. 4, be convenient to statement); With reference to Fig. 4: the I of system portion 155, the II of system portion 156 is placed on the vehicle body, be in mutually on the different planes, lever/slide plate is held the II of portion 157,158,159/160,161,162 are placed in balance spring post 163,164,165/166,167,168 (with reference to Fig. 1,85, with reference to Fig. 3,85) on, be barb seesaw structure, seesaw spring 169,170,171,172,173,174 elastic force make lever/slide plate hold the II of portion 157,158,159/160,161,162 are in the locking position, when chain drum rotates (direction shown in the arrow among the figure) forward, during via the I 155 of system portion, hold the I of portion 180,175,176,177,178,179 are stopped by the I of system portion 155 successively and dial to draw, lever is held the I of portion 157,158,159 by fulcrum 181,182,183 overcome the tooth bar spring force (does not draw among Fig. 4, down together), by chain drum periphery circular arc top (the portion I of holding separates lock-bit) 184,185,186 hold (holding portion I locking position) 189 to the greatest extent to chain drum periphery circular arc, 190,191 swings are at periphery circular arc end place to the greatest extent, lever is held the I of portion 175,176, scratch lever for 177 groups and hold the II of portion 157,158, the II of portion 157 is held by lever in 159 backs, 158,159 lockings, level type self-locking type tooth bar zip is locking (sprocket wheel release this moment) thus; Slide plate is held the I of portion 178,179,180 by fulcrum 192,193,194 overcome the tooth bar spring force, by chain drum periphery circular arc top (the portion I of holding separates lock-bit) 195,196,197 hold (holding portion I locking position) 198 to the greatest extent to chain drum periphery circular arc, 199,200 slide, at periphery circular arc end place to the greatest extent, slide plate recessed 201,202,203 with chain drum protruding 204,205,206 matching, (this concavo-convex stapling apparatus can prevent effectively that slide plate from holding the II of portion 160,161,162 slide plates when unblanking are held the I of portion 178,179, turn on 180, strengthen slide plate and hold the II of portion 160,161,162 reliability of unblanking), slide plate is held the I of portion 178,179, scratch slide plate for 180 groups and hold the II of portion 160,161, the II of portion 160 is held by slide plate in 162 backs, 161,162 lockings, slide plate type self-locking type tooth bar zip is locking (sprocket wheel release this moment) thus; Along with chain drum rotates forward, the II of system portion 156 dials successively to draw and holds the II of portion 162,157,158,159,160,161 unblank, hold the I of portion 180,175,176,177,178,179 under tooth bar spring force (not drawing among Fig. 4) effect, hold (holding portion I locking position) 200 to the greatest extent by chain drum periphery circular arc successively, 189,190,191,198,199 get back to chain drum periphery circular arc top (the portion I of holding separates lock-bit) 197,184,185,186,195,196, lever/slide plate type self-locking type tooth bar zip release thus (sprocket wheel locking this moment) moves in circles like this, finish the task that automatic stepless locking chain drum drives radius; One-sided type self-locking type tooth bar zip speed changer structure also can be unified to be placed on the chain drum mainboard 1 except that can unifying to be placed on the chain drum mainboard 2, can also interlock be placed on the chain drum mainboard 2 and chain drum mainboard 1 on; Bilateral type self-locking type tooth bar zip speed changer structure is promptly settled one-sided type self-locking type tooth bar zip change-speed box identical or inequality simultaneously at chain drum mainboard bilateral; Bilateral type tooth bar zip speed changer structure is promptly settled locking mode tooth bar zip identical or inequality change-speed box simultaneously at chain drum mainboard bilateral.

Claims

1, a kind of automatic stepless speed change chain guard device that is made of sprocket wheel, sprocket wheel chute, balance spring, sprocket shaft tooth, tooth bar, tooth bar spring, tooth bar zip is characterized in that: the tooth bar zip is at chain drum periodically locking and release, tooth bar spring elastic force deposit and elastic force discharges, tooth bar periodically separates with the sprocket shaft tooth and engagement, sprocket wheel periodically release and locking periodically in the rotating process forward;

2, a kind of bicycle that is made of vehicle frame, wheel, handlebar, chain gear system is characterized in that its chain gear is that automatic stepless speed change chain guard device as claimed in claim 1 is arranged;

3, a kind of boosted vehicle that is made of vehicle frame, wheel, handlebar, chain gear system is characterized in that its chain gear is that automatic stepless speed change chain guard device as claimed in claim 1 is arranged;

4, a kind of three-wheel vehicle that is made of vehicle frame, wheel, handlebar, chain gear system is characterized in that its chain gear is that automatic stepless speed change chain guard device as claimed in claim 1 is arranged;

5, a kind of carriage for children that is made of vehicle frame, wheel, handlebar, chain gear system is characterized in that its chain gear is that automatic stepless speed change chain guard device as claimed in claim 1 is arranged;

6, automatic stepless speed change chain guard device according to claim 1, it is characterized in that: the tooth bar zip in the tooth bar zip is held portion and tooth bar zip system portion at chain drum forward in the rotating process, periodically mutual action, finish periodic locking of tooth bar zip and release;

7, automatic stepless speed change chain guard device according to claim 1 is characterized in that: tooth bar links to each other with the tooth bar spring, and the tooth bar spring force impels the engagement of tooth bar and sprocket shaft tooth, with the sprocket wheel locking;

8, automatic stepless speed change chain guard device according to claim 1, it is characterized in that: during tooth bar zip locking, tooth bar spring force deposit, tooth bar separate with the sprocket shaft tooth, the sprocket wheel release, during the release of tooth bar zip, the release of tooth bar spring force, tooth bar and the engagement of sprocket shaft tooth, sprocket wheel locking.