CN87201948U - Link-driving type speed-changing mechanism for bicycles - Google Patents

Abstract

The utility model relates to a lever propulsion speed changing mechanism for bicycle, comprising a speed changing turn knob (18) which is arranged on a bicycle frame (1) and a cable which is connected the speed changing turn knob. A couple of shifting arms (3) are provided with a certain angle with a driving rod (4) and are formed an integral component with the driving rod, the shifting arms are arranged on a main shaft part (2) with a certain distance by a pivot and are connected by the cable. One end of the cable can move along the length direction of one side shifting arm and is connected with the shifting arm and a connecting device (14, 14) at one end of a chain (7').

Description

Link-driving type speed-changing mechanism for bicycles

The utility model relates to the speed-changing mechanism of rod driven bicycles.

The utility model is particularly useful for that the power that the up-and-down movement of drive spindle produces is transferred to trailing wheel by chain and sprocket wheel and comes bicycle driven, and the speed change of bicycle is to be obtained by the position that changes the pipe link that connects chain and shifting arm.Should be understood that " bicycle " speech comprises that also other drive and have the vehicle of the wheel of varying number with the same manner, for example three-wheel vehicle etc.

Traditional bicycle major part is that the circulatory motion by crank pedal drives.Yet 360 ° of rotations of crank have only seldom that a part is used for promoting bicycle, and the remainder that rotates has been wasted.Therefore the motroist will consume more energy and soon feel tired under identical riving condition.Because when driving traditional bicycle, the stroke of pedal can not be regulated and must commentaries on classics one put in order circle, if motroist's physical condition is not suitable for the annular rotational travel of crank pedal, will feel under the weather.In addition, the speed change of standard bicycle will adopt the sprocket wheel that is installed in the various sizes on the same axle, and complex structure, heaviness need bigger kinergety.Because chain can be thrown off with change wheel during walking, so often need the refitting chain that stops.

Though someone advised the rod driven bicycles that the up-and-down movement by drive spindle drives, the mechanism that kinergety is transferred to rear axle can't be satisfactory.Often quadrant gear (fan-type gear) or tooth bar are connected on the drive spindle and and are installed in transmission gear engagement in the rotating shaft of trailing wheel.Bicycle by tooth bar or quadrant gear repeat seesaw or up-and-down movement drives.When motion in the position, top of drive spindle or when the position stops at the end, the momentum of tooth bar or quadrant gear is transferred on the gear of trailing wheel with the form of impacting.Like this, drive and just be accompanied by the serious impact of repetition, and occur unsettled phenomenon easily.Particularly, in the driver train claw of free wheel and ratchet since serious repetitive shock engage and wear and tear rapidly with separating even damage.In addition, obtain speed change by the length that changes shifter bar.Connecting pin on the pipe link of the quadrant gear of trailing wheel transmission or tooth bar is inserted on the shifter bar in the slotted eye in the emissions groove hole, and this shifter bar is driven by the speed change steel wire and moves up and down, and the speed change steel wire is handled by actuating speed control stalk up and down.Yet connecting pin bears sizable load when operation, and this load can increase the weight of when the speed control bar is done the drawing motion, under this heavy duty, is difficult to handle little speed control bar with mobile connecting pin with hand.The motroist will stop car when carrying out speed change, and it is difficult wanting speed change when bicycle is advanced.Although drive the required energy of this bicycle more than much smaller by the required energy of the standard bicycle of the annular rotating drive of crank pedal.Above-mentioned problem is unfavorable for the practical application of rod driven bicycles.

The purpose of this utility model provides a kind of speed-changing mechanism of improved rod driven bicycles to improve the practicality of bicycle.

According to a kind of embodiment of the present utility model, two free-wheel clutchs that link with sprocket wheel (drum-type free wheel) are installed in the two ends of bicycle rear.Chain engages is on sprocket wheel, when using a pair of chain, one end of chain preferably links together with the reciprocal hawser that winding is supported on the guide wheel, the most handy pipe link that has connecting pin of the other end of chain is connected on the shifting arm of actuated lever arm assembly, change-speed box and drive spindle are one and use pivotal mounting, make parts of hunting motion.Pivotally revolving member on each shifting arm, it can be with the fixing corner block of pivot.These pivoted members block the connecting pin of pipe link.The control stalk that has projection can be regulated with speed controller, and makes arbitrary pivoted member be pivoted to the shifting arm outside selectively.Connecting pin on the chain pipe link is clamped on the pivoted member that stretches out from shifting arm.The up-and-down movement of drive spindle (swing) makes chain reciprocating.Trailing wheel is promoted forward by sprocket wheel like this.During speed change, any pivoted member Be Controlled bar is released the shifting arm outside on the shifting arm, and the connecting pin actv. is stuck in the notch of the pivoted member that stretches out.Therefore shifting arm is connected with chain on different positions.Like this, in addition bicycle in when walking also speed change at any time.The caused impact of momentum when simultaneously, the flexibility of the chain up-and-down movement that also can reduce drive spindle stops at extreme higher position or extreme lower position.This has also been avoided the serious impact to actuating device (power-transfer clutch on the trailing wheel and other mechanisms).Therefore, can reduce the possibility that these devices are out of order and damage.Drive bicycle with drive spindle, the kinergety of shank is waste not, and the up-and-down movement of drive spindle fully is used for driving bicycle.Characteristics of the present invention provide a kind of bicycle, compare with standard bicycle, and the motroist can more comfortablely ride the longer time more like a cork.

Therefore, the utility model provides a kind of driver train that is used for rod driven bicycles.This bicycle has one to have the vehicle frame of main shaft portion and be positioned at the hind axle part of the main shaft portion back on the above-mentioned vehicle frame.This driver train comprises:

The a pair of drive spindle of pedal, a pair of arm, pivot of being equipped with; Above-mentioned pivot, drive spindle and arm keep at a certain distance away to arm for parts being made up of a bar in the above-mentioned a pair of drive spindle and an arm in a pair of arm and with another bar and in a pair of arm another in a pair of drive spindle.An above-mentioned component assembly is with being pivotally mounted on the above-mentioned main shaft portion.

One rear axle is installed on the hind axle part.

Rear wheel hub is contained on the above-mentioned rear axle.

Pair of sprocket is spaced a certain distance to be installed on the above-mentioned rear axle.

A pair of free-wheel clutch connects together above-mentioned sprocket wheel and above-mentioned wheel hub.

One chain is on above-mentioned sprocket wheel.

The device that connects above-mentioned chain and above-mentioned arm, when above-mentioned bar and arm were swung up and down by the masterpiece that is added to above-mentioned pedal, this device was reciprocating.

More specifically say according to the utility model, chain has two parts, respectively be installed on one of above-mentioned sprocket wheel, each root chain has relative two ends, one of above-mentioned chain is connected with one of above-mentioned arm, another root of above-mentioned chain is connected with above-mentioned another arm, and steel rope couples together another end opposite of above-mentioned two chains.Reel device is installed on the above-mentioned vehicle frame, can rotate in order to guide above-mentioned steel rope.

By modification, above-mentioned free-wheel clutch includes a pair of free wheel device, is installed on the above-mentioned rear axle place near its two ends, can rotate and and one of above-mentioned wheel hub and above-mentioned sprocket wheel mesh or separate.

Foregoing and other purposes of the present utility model, feature, advantage and the embodiment that recommended here are from below in conjunction with will be more apparent the narration of accompanying drawing.

Fig. 1 is the overview according to the bicycle of the utility model assembling.

Fig. 2 is according to the utility model, as shown in fig. 1 from drawing the main portion-driver train of car and the transparent view of speed-changing mechanism.

Fig. 3 is according to wheel hub of the present utility model and the exploded view that includes the one-way clutch mechanism of drum-type free wheel.

Fig. 4 (A) is the lateral plan of free wheel device.

Fig. 4 (B) is the lateral plan of free wheel when travelling forward.

Fig. 4 (C) is the lateral plan of free wheel when moving backward.

Fig. 5 is rear-wheel hub and the free wheel part sectional view when being assembled together.

Fig. 6 is the disconnection transparent view according to the speed-changing mechanism of embodiment of the present utility model.

Fig. 7 (D, E and F) is respectively the scheme drawing of speed-changing mechanism when first speed, second speed and the 3rd speed.

Now the accompanying drawing of detailed referential expression embodiment of the present utility model makes a presentation the utility model, and Fig. 1 has represented a bicycle that includes drive spindle 4 and shifting arm 3.These drive spindles and shifting arm are on the shaft portion 2 of one side arm 1 bottom that is installed in bicycle.The component assembly of drive spindle 4 and shifting arm 3 is with being pivotally mounted on the axle 2, so that drive spindle 4 is by pedal 4 ' do up-down alternative motion (swing).Drive spindle 4 is kept at an angle with respect to shifting arm 3." and the size of pipe link 14 that shifting arm is a little a bit crooked, and amount of bow depends on vehicle frame and chain 7.Therefore, pipe link moves along specific serpentine track, chain 7 " is connected with shifting arm 3 with pipe link 14.Guide wheel 13 supporting back and forth steel rope 7 '.The hind axle part 2 of vehicle frame 1 ' bottom after the free wheel 11a of one-way clutch mechanism and sprocket wheel 7 are installed in together ' on.Shown in the upper right corner among Fig. 3, hind axle part 2 ' rear wheel assembly form by axle 5 and wheel hub 6.Cam plate 8 have several inclined grooves 8 along the periphery disposed at equal distance '.Plate shaped flange 8 links to each other with sprocket wheel 7.Each inclined groove be equipped with hard roller 9 and spring 9 '.Plate shaped flange 8 devices have claw 10 and ratchet 10 ' cylinder 11 in, the shape that claw 10 and ratchet 10 ' the composition Greek alphabet is gone into.This free wheel 11a assembly also is equipped with ratchet 12.Two ratchets are assembled in the two ends of axle.The nose of claw 10 is at spring 10 " thrust under snap in square groove 6 ' interior (seeing Fig. 3 and Fig. 4) on the wheel hub 6.Ratchet 10 ' when moving backward, pinned by ratchet 12.This just makes claw 10 from groove 6 ' interior disengagement.When bicycle travelled forward, roller 9 was compressed on the crevice of the inclined groove under cylinder 11 inner peripheries.So just the power on the sprocket wheel 7 is transferred on the wheel hub 6 by cylinder 11 and (sees Fig. 3,4 and 5).Can establish several grooves 6 ' so that when moving forward, can mesh again more.

Chain 7 is " with sprocket wheel 7 engagements at axle 5 two ends.One end of these chains and reciprocal steel rope 7 on guide wheel 13 ' be connected.The other end of chain is that free end is connected with pipe link 14.Each usefulness connecting pin 14 of each root pipe link ' be connected with shifting arm 3, as shown in Figure 2.

Each shifting arm 3 is equipped with several pivoted members that become row arrangement along its length, and these pivoted members are the shape of corner block 15, are installed on the fixed pivot.Each corner block on the summit on its two limits of triangle, have " U " shape groove 15 '.Form pivotal joint with supporting pin 16.(seeing Fig. 6 and 7) removed in the bottom of spring 16 ' corner block 15 is passed arm downwards.Disposing cam bar 17 in each arm moves as length direction below corner block 15.The projection 17 of cam bar ' number and the number of corner block 15 as many.Cam bar and steel rope 19 ' be connected.Steel rope is walked around reel 18 ' rotated by velocity control knob 18.Knob 18 is assemblied on the cylinder, and this cylinder is equipped with the ball of being passed by spring 18 " " 18 " ', ball by passing press against reel 18 ' hole 18 " on.By velocity of rotation control dial 18, cam bar 17 moves to the left or to the right, as shown in Figure 6 and Figure 7.Arbitrary of corner block 15 by the projection on the cam bar 17 17 ' boost and reach outside the edge of shifting arm 3, connecting pin 14 ' can move on this edge.Like this, pipe link 14 snap in automatically " U " shape groove 15 of the piece 15 that stretches out ' in.Realized the change of speed by the connection of pipe link 14 on the diverse location of shifting arm 3.

Among Fig. 3, one group of ball 20 is contained in the seat 21 and by ball race 22 to be held, and with nut 23 it is contained on the axle 5 again.

In the time of by bike, the motroist is sitting on the saddle, holds handlebar, pin be placed on left and right sides pedal 4 ' on.The motroist repeats up-and-down movement (swing).What the angle that shifting arm 3 constitutes according to itself and catch bar 4 was done to repeat moves forward and backward.Two shifting arms replace traction bars 14 makes chain 7 " makes preceding crank motion.Sprocket wheel 7 is with the both direction alternate rotation.If sprocket wheel 7 clockwise rotates, plate shaped flange also rotates with equidirectional, roller 9 upwards roll into adjacent grooves 8 ' the narrow space of dip plane in go, on the inner periphery of the cylinder that is stuck in free wheel 11a 11 tightly.Force cylinder 11 and free wheel 11a to rotate like this.At this moment and since the nose of the claw 10 in the cylinder 11 be stuck in the square groove 6 of wheel hub 6 ' in, shown in Fig. 4 (B), so wheel hub 6 also rotates with equidirectional and drives bicycle and move forward.

" roller 9 in plate shaped flange groove is rolled into the wider portion of groove downwards and is separated from the cylinder 11 of free wheel 11a for backward rotation, perhaps sprocket wheel 7 transfixions when bicycle slides if sprocket wheel 7 is by chain 7.Therefore the backward rotation of sprocket wheel 7 does not pass on the cylinder, and wheel hub 6 is not subjected to sprocket wheel 7 counter-rotational influences because amount of spin still rotates forward.When sprocket wheel 7 again when direction of propulsion rotates, plate shaped flange 8 and cylinder 11 are clamped together again power are transferred on the wheel hub 6.Therefore, when catch bar 4 moved up and down, the power that is produced was transferred to sprocket wheel 7 and goes with the free wheel 11a that is installed in rear axle 5 two ends, and bicycle just continuously to overtake.

When needing speed change, velocity of rotation control dial 18, cam bar 17 is moved, and promotes to dispose in the shifting arm 3 first pivot block 15 of the most close axle 2 in many pivot blocks 15 of embarking on journey, shown in Fig. 7 (D).Like this, the connecting pin 14 on the pipe link 14 ' just by the moving surface of the weight of pipe link self and shifting arm 3 snap in automatically first 15 " V " shape groove 15 ' in, the result forms first speed of dead slow.Shown in Fig. 7 (E), the second pivot corner block 15 is pushed out, and the connecting pin on the pipe link 14 snaps onto on second corner block 15, has obtained second speed a little hurry up.Connecting pin 14 snaps onto on the 3rd corner block if the 3rd corner block 15 is pushed out, and shown in Fig. 7 (F), has just obtained the 3rd speed more hurry up.In such a way, the speed change knob is rotated, be stuck in connecting pin 14 on the shifting arm ' the position be changed changing the effective length of shifting arm, thereby obtained required speed change.

When bicycle moves backward, during its wheel backward rotation, on the tooth of ratchet 10 ' snap in ratchet 12 and claw 10 upwards push away square groove 6 from wheel hub 6 ' be separated from, as scheming shown in (C).Like this, have only wheel hub 6 to rotate and free wheel 11a and sprocket wheel 7 do not change.Therefore bicycle is the same with standard bicycle, can travel backward and slide and do not cause moving up and down of drive spindle.

The bicycle that promotes according to bicycle of the present utility model and traditional bicycle and other rod-types is compared has following advantage, because the design of bicycle makes drum-type free wheel and sprocket wheel link together, be installed in the two ends of rear axle, chain is installed in crank motion is provided on the sprocket wheel.The pipe link that links to each other with chain with and group of drive rods all-in-one-piece shifting arm connect together.Bicycle is driven by the up-and-down movement of pedal.This motion angle can and make things convenient for situation to determine according to motroist's physical condition.Like this, the rider just can be more comfortable and light.Simultaneously, the power of being transmitted by the drive spindle up-and-down movement can be transferred to wheel hub fully by sprocket wheel and free wheel.Like this, energy is waste not, only needs very little power in the time of by bike.In addition, make the moving up and down leg exercise of drive spindle similar with the action of the usual walking of people.Therefore, even the beginner can any special training, and to operate bicycle with the identical mode of walking.Because the flexibility of chain can reduce the shifting arm caused impact of its momentum when stopping at forward and backward end position of moving forwards, backwards, can avoid the serious impact to the actuating device of hind axle part.Can transmit power smoothly by the drum-type free wheel.The reliability and the life-span of actuating device have improved, and the time of bicycle operation can extend.

In addition, a lot of corner blocks in a row are installed on the shifting arm with pivot, can selectively release outside the shifting arm by the cam bar that velocity control knob is handled for its any one, connecting pin on the pipe link end snaps onto on the piece that stretches out, therefore in addition bicycle when walking, also can obtain needed speed change.The speed of a motor vehicle depends on the road surface situation, and ascents and descents for example is more comfortable and more convenient when guaranteeing by bike.

Claims (8)

1, a kind of speed-changing mechanism that is used for rod driven bicycles is characterized in that it comprises:

Be installed in the speed change knob (18) on the vehicle frame (1);

With this speed change knob (18) bonded assembly hawser (19);

With drive spindle (4) be arranged to certain angle and with a pair of shifting arm (3) of its formation global facility, be installed on the main shaft portion (2) with pivot is separated by a distance, and link to each other with hawser (19);

The one end can move and connect this shifting arm (3) and the chain (connecting device (14,14 ') of 7 ") end along the length direction of shifting arm (3) one sides.

2, the speed-changing mechanism of rod driven bicycles according to claim 1 is characterized in that this shifting arm (3) has one from the edge of pivot to the length direction extension;

The elongated slot of this shifting arm, offering from this edge side that extends along its length direction;

In this elongated slot, be furnished with and link to each other with hawser (19) and can or break away from the engagement of this connecting device (14,14 ') end to change the mechanism of shifting arm effective length.

3, the speed-changing mechanism of rod driven bicycles according to claim 2, it is characterized in that wherein linking to each other with hawser (19) also can comprise with engagement of this connecting device (14,14 ') end or the mechanism that breaks away to change shifting arm (3) effective length:

In this elongated slot and along its length direction separated by a distance with pivotal mounting some can with this connecting device (14,14 ') end engagement or the revolving member (15) that breaks away from;

Below this revolving member (15), the one end of installing in this elongated slot links to each other with hawser (19) and can be along the bar that vertically moves (17) of arm, and bar (17) has and somely keeps at a certain distance away successively and different member (15) ingear devices along its length direction;

Be installed in the elongated slot of arm and order about the spring (16 ') that member (15) is pressed to bar (17);

Be installed on the shifting arm and and be connected, order about spring (17 ") of bar (17) to a vertical side shifting with these (17).

4, speed-changing mechanism according to claim 3 is characterized in that member (15) is normally leg-of-mutton, has three limits.

5, speed-changing mechanism according to claim 4 is characterized in that, is shaped on and the engagement of this connecting device (14,14 ') end or the groove of throwing off in an apex portion of triangle member (15); The 3rd limit on this opposite, summit is facing at the bottom of the above-mentioned elongated slot; Bar (17) is placed between above-mentioned the 3rd and the above-mentioned bottom land; Near the 3rd limit and the formed summit of another side of above-mentioned triangle member (15), with pivot (16) installation component (15).

6, speed-changing mechanism according to claim 3 is characterized in that keeping at a certain distance away successively and different component (15) ingear device is several projectioies along its length direction on the bar (17).

7, speed-changing mechanism according to claim 1 is characterized in that wherein connecting device comprises along the transportable connecting pin of shifting arm (3) edge length direction (14 ') and connects chain (7 ") and the pipe link (14) of this pin (14 ").

8,, it is characterized in that the number of triangle member (15) and the number of protrusions on the bar (17) as many according to claim 4,5 or 6 described speed-changing mechanisms.

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