CN85105701A - A kind of infinitely variable speed device of chain transmission - Google Patents

Abstract

The invention belongs to mechanically operated technological improvement.The present invention comprises diameter-changing wheel and two parts of Idle wheel in the ordinary course of things.Diameter-changing wheel part: on reducing base wheel, shake and change the swing diameter of diameter-changing wheel with bow-shaped joystick, replaced sliding friction in the groove in the prior art, improved working efficiency, reliability and practicability and working life; Solved the engagement problem of chain in stepless change; Production process and processing technology have been reduced simultaneously; Can save material.The Idle wheel part: in the process of speed change because of required chain length difference, so with Idle wheel with lax chain tension.Thereby make chain transmission automatically carry out stepless change according to the size of load effectively.

Description

A kind of infinitely variable speed device of chain transmission

The invention belongs to mechanically operated technological improvement.

Before the present invention made, " world's light industry " magazine of nineteen eighty-three and 1984 all once published, the stepless speed variator of using on the state-owned a kind of bicycle of method.Two big garden dishes are arranged on it, have six uniform spiralitys to wear groove on one of them garden dish, have six uniform straight spoke shapes to wear groove on another garden dish.When two gardens dish coaxial lines were superimposed together, spirality was worn groove and straight spoke shape and is worn the intersection of groove and form six holes that are similar to prismatic.One end has a planet sprocket, and the other end has the little axle of a gear to pass from six holes respectively.Therefore the little axle of the six roots of sensation promptly is subjected to the control of two garden dishes in the control lower slider of two kinds of grooves.When the power of chain was added on the planet sprocket, an end of little axle was stressed.In order to reach the two ends stress balance of little axle, the other end of little axle is worn the tooth bar engagement on groove next door at straight spoke shape with gear and riveting.Hole and planet sprocket that extension spring is built up two garden dishes remain on the maximum swing diameter.When being subjected to certain resistance in the process that bicycle is travelling, spring is stretched, two garden dishes rotate an angle mutually, the position in hole and planet sprocket move along radial direction simultaneously, six planet sprockets can form different swing diameters, replace the drive sprocket of different-diameter, play infinite variable speed effect.

With regard to above structure and method, also exist the defective that is difficult for overcoming, little axle must slide in two kinds of grooves, so the degree of finish and the required precision of groove and axle are higher, and lubricating condition is also relatively poor, also attaches silt or other obturator in the groove easily.When being easy to make axle more for a long time, silt or other obturator in groove, block; And silt or other obturator can make groove and axle wearing and tearing more after a little while, influence working life; And its working efficiency in transmission process is reduced.Problems such as the processing technology that also exists used gear, tooth bar and groove simultaneously is numerous and diverse, and production process is more.

This speed changer except above defective is arranged, also exist two initiatively planet sprockets have only three teeth to work, its engagement position is all the time on a position, and is easy to wear.The crown of sprocket wheel and the contacted situation of roller of chain are taken place, and the problem that occurs above various faults and existence because of this speed changer easily greatly reduces use value.

The present invention system utilizes the variation of chain pull to carry out speed change, in the process of this infinitely variable speed device in transmission, runs into and loads when changing, and will be directly reflected into the variation of chain upper pulling force.Therefore can utilize the variation of chain pull automatically to carry out stepless change.

This speed change gear generally can be in two sub-sections: one of them is a diameter-changing wheel part (Fig. 1); Another is an Idle wheel part (Fig. 2); Two part relations of installing mutually are as Fig. 3.

The diameter-changing wheel part can directly replace original drive sprocket work.As Fig. 1, (two drive planet sprocket " 5 " by six planet sprockets for it, four rotation planet sprockets " 1 ") be rotatably connected mutually by six uniform holes on reducing base wheel " 12 " wheel rim at six bow-shaped joysticks (two active bow-shaped joysticks " 6 ", four driven bow-shaped joysticks " 2 ") and center.When load increases, when being the pulling force increase on the chain " 7 ", no matter the tension of its increase is on any one planet sprocket " 5 " or " 1 ", this planet sprocket " 5 " or " 1 " is then in company with bow-shaped joystick " 6 " or " 2 ", and is that radius is drawn close to reducing base wheel " 12 " with the length of bow-shaped joystick " 6 " or " 2 ".Same motion is carried out simultaneously in other five planet sprockets " 5 " and " 1 " under the effect of synchronizing ring " 4 " and Synchronous pull rod " 3 ".Therefore, six planet sprockets " 5 " on the whole diameter-changing wheel and the swing diameter of " 1 " diminish, and promptly velocity ratio diminishes.When the pulling force of chain " 7 " reduced, the pulling force that is added in the extension spring " 8 " on the synchronizing ring " 4 " made the swing diameter of six planet sprockets " 5 " and " 1 " become big by Synchronous pull rod " 3 ", and promptly velocity ratio becomes big.The pulling force of extension spring " 8 " is the reaction force of the pulling force of chain " 7 ", and when the pulling force of chain " 7 " was under a certain numerical value, extension spring " 8 " made diameter-changing wheel have maximum swing diameter; When the pulling force of chain " 7 " during greater than a certain numerical value, the swing diameter of diameter-changing wheel begins to dwindle.When the pulling force of chain " 7 " arrived to a certain degree greatly, the swing diameter of diameter-changing wheel was reduced to minimum.In a word, two kinds of pulling force keep its equal and opposite in direction of balance all the time voluntarily.Direction is opposite.The pulling force and the rigidity of extension spring " 8 ", fibrous root is determined according to situations such as load and quantity.Therefore, this speed change gear can automatically carry out stepless change according to the load condition in the transmission.

Above speed change is a kind of stepless change, its planet sprocket " 5 " and " 1 " not necessarily can well be meshed with chain " 7 ", here except that crown correction to planet sprocket " 5 " and " 1 ", also on driving planet sprocket " 5 ", installed engagement levelling mechanism that makes it can float and be a bit larger tham half chain pitch additional, small extension spring " 10 " makes driving planet sprocket " 5 " occupy unsteady neutral position, the position of yielding is all arranged when any one side at roller of crown, will mesh levelling.In order to make small extension spring " 10 " that fixing position be arranged, settled engagement levelling rocking bar " 9 " in addition, it has also strengthened the initiatively supporting force of bow-shaped joystick " 6 " simultaneously, and engagement does not have big influence to rotation planet sprocket " 1 ".

In the process of speed change, when diameter-changing wheel dwindled, the length of required chain " 7 " must shorten, otherwise chain " 7 " is relaxed and normally transmission.Therefore, installed the tensioning mechanism of chain " 7 " additional, i.e. the Idle wheel part.

This Idle wheel part is as Fig. 2, and its installation position is in the slack list of chain " 7 ", and it is made up of the identical or different sprocket wheel " 1 ' " of each size of supporting rod " 3 ' " two ends (also the wheel of available other form replaces).Supporting rod " 3 ' " has only a rotating fulcrum, an and end of deflection supporting rod " 3 ' ", from the moment of a fulcrum end far away under action of gravity greater than the other end, chain " 7 " passes between two sprocket wheels " 1 ' ", the big end of moment is on chain " 7 ", when the swing diameter of diameter-changing wheel dwindles, chain " 7 " just has unnecessary one section because of lax, end on the chain " 7 " is depressed chain " 7 " under moment loading, the other end then with on chain " 7 " top, makes chain " 7 " tensioning.In order not allow chain " 7 " fall down, added a chain cover " 2 ' " thereon.As tension force when enough big, can be without this chain cover " 2 ' "; If tension force inadequately then can add shock mount.

Main points of the present invention have been to adopt a kind of method and structure unlike the prior art to realize stepless automatic transmission, have original sliding friction to be become shake or swing; And each component can be interfixed and install preferably; Solved the engagement problem of toothed chain in stepless change; Reliability and practicability have been improved; Working efficiency and working life have also been improved; Also reduce production process simultaneously and simplified processing technology; And can reduce multiple advantages such as raw-material consumption.

The present invention can be used on chain transmission and need carry out in the transmission system of speed change according to load, also can according to circumstances be used in the bel-drivenn speed variator system.

This device has been made the model that is used for speed change on the bicycle.Making under the situation about more slightly making, also can easy and flexible finish necessary gear shifting operation, promptly realize stepless automatic transmission.

Claims (15)

1, a kind of infinitely variable speed device of chain transmission is characterized in that being made up of diameter-changing wheel Fig. 1 and Idle wheel Fig. 2 two-part.

Diameter-changing wheel partly is characterized in that on the wheel rim of reducing base wheel (12) several holes being arranged, end with the active bow-shaped joystick (6) of two symmetries is rotatably connected mutually respectively, and remaining hole is rotatably connected mutually with an end of driven bow-shaped joystick (2) respectively.The other end of two kinds of bow-shaped joysticks (6) and (2) is connected with (1) with two kinds of planet sprockets (5) respectively.The sprocket wheel end of two kinds of bow-shaped joysticks (6) and (2) has the position-limiting action that limits steamboat footpath voluntarily, and the spacing contact that limits bull wheel footpath is arranged near the position of the other end.Other has a synchronizing ring (4) and reducing base wheel (12) coaxial line to install, and can rotate thereon.Hole with reducing base wheel (12) corresponding quantity is arranged on the synchronizing ring (4), each hole is rotatably connected mutually with an end of Synchronous pull rod (3) respectively, the other end of Synchronous pull rod (3) respectively with two kinds of bow-shaped joysticks (6) and (2) in the middle of the hole each be rotatably connected mutually.And there is the extension spring (8) more than to act on reducing base wheel (12) and the synchronizing ring (4).Also have two engagement levelling rocking bars (9) in addition, the opposite of the driving planet sprocket (5) on active bow-shaped joystick (6) is coaxial to be connected in the same way.One end of small extension spring (10) is hung thereon, and the other end hangs over and drives on the planet sprocket (5), has the sprocket wheel spline pin (11) more than to float therein from active bow-shaped joystick (6), driving planet sprocket (5).

Idle wheel is characterized in that partly respectively there is a sprocket wheel (1 ') at the two ends of a supporting rod (3 '), one off-centered fulcrum is arranged on the supporting rod (3 '), and can on its fulcrum, rotate, chain (7) passes between two sprocket wheels, relies on gravity or tensioned chain (7).

2,, it is characterized in that the member of diameter-changing wheel part can be by the stack mounting of arranging of different hierarchical sequences according to the described speed change gear of claim 1.

3, according to claim 1 and 2 described speed change gears, it is characterized in that available two groups of above diameter changing mechanisms are superimposed or connect superimposedly with axisymmetric, planet sprocket (5) and (1) are placed between the diameter changing mechanism.

4, according to the described speed change gear of claim 3, it is characterized in that two groups of above diameter changing mechanisms are superimposed has only lazy-tongs, also plural lazy-tongs can be arranged.

5, according to the described speed change gear of claim 3, it is characterized in that two kinds of bow-shaped joysticks (6) and (2) can have only part or all that position-limiting action is arranged, also can have one group or two groups above position-limiting action arranged.

6, according to the described speed change gear of claim 3, when it is characterized in that diameter changing mechanism is superimposed, available another active bow-shaped joystick (6) replaces engagement levelling rocking bar (9).

7,, it is characterized in that extension spring (8) also can act between reducing base wheel (12) and two kinds of bow-shaped joysticks (6) and (2) or the Synchronous pull rod (4) according to the described speed change gear of claim 1.

8, according to the described speed change gear of claim 1, it is characterized in that can be under the constant situation of structural principle and method, and the profile of each component can have certain variation.

9,, it is characterized in that this speed change gear also can adopt other tensioning method to come tension chain (7) according to the described speed change gear of claim 1.

10,, it is characterized in that this speed change gear can be useful for row's chain or arrange chain more according to the described speed change gear of claim 3.

11,, it is characterized in that this speed change gear can be used in the motor-driven and non-maneuverable transmission according to the described speed change gear of claim 3.

12, according to the described speed change gear of claim 11, it is characterized in that can be according to the situations of transmitting such as power, change planet sprocket (5) and (1) and tension sprocket (1) into belt pulley, are used among the belt transmission.

13,, it is characterized in that this speed change gear can adopt metal or nonmetallic material to make according to the described speed change gear of claim 12.

14, according to claim 3 and 7 described speed change gears, when it is characterized in that changing the tension direction of extension spring (8), diameter-changing wheel can be used as driven wheel and uses.

15, according to the described speed change gear of claim 14, it is characterized in that available two diameter-changing wheels use simultaneously as driving wheel and driven wheel respectively, do not need the Idle wheel part this moment.

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