KR20000006730A - Variable crank-shaft device for driving a bicycle - Google Patents

Abstract

PURPOSE: A crank shaft varying apparatus for the drive of bicycle is provided to be used with compatibility by installing a driving apparatus conveniently and easily on a bicycle manufactured previously. CONSTITUTION: The crank shaft comprises:a first crank rod(11) having a fixation hole(12) formed to fix a drive shaft(2); a second crank rod(13) installed in parallel and crosswise with the first crank rod while installing a pedal shaft(16) on the bottom to rotate, and fixed by being interlocked by serration to connect and fix a pedal(17) by both sides of the pedal shaft and an eccentric cam(18) without being rotated; and a couple of links(14a)(14b) fixed by a shaft pin(15) to make the two crank rods to be folded simultaneously.

Description

Variable crank-shaft device for driving a bicycle}

The present invention relates to a crankshaft variable device for driving a bicycle, and more particularly, an eccentric cam according to a rotational movement of a pedal by connecting a pair of crank rods installed on both sides of a drive shaft of a chain sprocket of a bicycle by a link for folding. The variable rod can be changed by pushing and pulling, so that the length of the crankshaft can be varied by the pedal rotation during driving of the bicycle, so that the maximum driving effect can be obtained with minimum physical energy. In addition, the present invention relates to a crankshaft variable device for driving a bicycle that can be easily used by easily and easily installed a driving device on an existing bicycle.

In general, the bicycle is connected to the rear wheel and the chain on both sides of the chain sprocket to drive the rear wheel, and the pedaling is fixed to the end of the crankshaft which is directly fixed to both sides of the drive shaft of the chain sprocket so that the occupant can be driven. It is well known that the pedal fixed to the crankshaft of the drive rotates within a certain radius of rotation, and this rotational force causes the rear wheels connected by the chain to rotate.

However, the conventional drive device used for this purpose is a fixed drive device fixed to the crankshaft is set to a fixed length on both sides of the drive shaft of the chain sprocket and the pedal is fixed to the end of the crankshaft, and the patent application No. 97 There was a variable driving device that could vary the crankshaft by a certain distance, such as -58360, but the electronic fixed drive device described above has a constant rotation radius of the pedal that generates the power source during driving, so that the pedal is continuously generated to generate the driving force. Since the same driving energy is always provided when stepping on, it is impossible to expect a more fundamental and efficient driving energy, and thus there is a drawback that the maximum driving effect is not obtained compared to physical energy consumption.

In addition, the latter variable drive device maintains a constant width so as to be installed in the bicycle frame shaft hole, so that the main shaft and the rotation shaft are eccentrically spaced on both sides of the shaft pipe in which the chain sprocket is integrated, and then the rotational force is applied to the chain. Fixing the power transmission unit for transmission, the crankshaft coupled with the slide tube fixed to the outer end of the power transmission unit in the state capable of pivoting on both sides of the shaft pipe, the slide lever fixed to the outside of the end of the power transmission unit It is installed on the rotating shaft spaced apart from the main shaft by a fixed distance. The rotating lever is fixed to the inner surface of the slide tube by the fixed shaft to rotate the pedal during driving. Slide tube and crankshaft fixed by 180 ° alternately on the ship, ie when the pedal is pressed When the pedal is raised and the pedal is raised to the minimum length, the maximum driving energy is obtained by maximal driving energy with little physical consumption. However, the variable driving device as described above has both sides of a shaft pipe in which separate chain sprockets are integrated. The assembly of the crankshaft and slide tube assembled to the power unit, the rotating lever and the variable valve is enlarged and the size of the driving device is enlarged, and the structure is complicated and difficult to assemble. The flaw made is inherent.

In addition, the variable drive device is a situation that can not be used to install and install a separate bicycle suitable for the set drive device has caused a problem that is incompatible with the existing bicycle.

The present invention is to solve the above problems, the main object of

A crankshaft fixed to both sides of the drive shaft of the chain sprocket is formed by a pair of crank rods, and the pair of crank rods are connected to each other by a link for easy folding, and an eccentric cam fixed to the pedal shaft and fixed to the drive shaft The fixed rod is connected between the fixed crank rods so that the eccentric cam pushes and pulls the variable rods according to the rotational movement of the pedals while driving, so that the length of the crankshaft can be expanded or reduced to the maximum, minimum, and driven with minimum physical energy. It is to provide a crankshaft variable device for driving a bicycle to maximize energy.

Another object of the present invention is to provide a pedal for driving expansion and contraction of the crankshaft by installing a cylinder at the lower end of one side of the crank rod installed at the drive shaft of the chain sprocket and the link lower end for connecting and installing the crank rod. When pressing down, the cylinder rod of the cylinder is advanced by the energy, and the length of the crankshaft is extended and variable.When the pedal is raised, the length of the crankshaft is reduced by the restoring force of the tension spring installed at the end of the cylinder body and the cylinder rod. In order to maximize the driving energy with a minimum of physical energy, as well as to be applied to the rotary pedal of the general bicycle to provide a crankshaft variable driving device for the bicycle to be compatible.

Another object of the present invention is to form a pair of crank rods fixed to both sides of the drive shaft of the chain sprocket, and the eccentric cam at the time of rotation of the pedal is variable by laying out the pair of crank rod ends with a hinge axis When pushing the pedal while driving, the crankshaft connected to the hinge shaft is extended when the pedal is pressed while driving, and the length of the crankshaft is extended and variable. The crankshaft variable device for driving a bicycle that can be simplified and compacted while making it possible to maximize the driving energy with minimum physical energy. It is to provide.

1 is a perspective view of a drive crankshaft variable apparatus to which the present invention is applied.

Figure 2 is a side view showing an operating state of the variable device according to the invention.

Figure 3 is a side view of a variable device showing another embodiment of the present invention.

Figure 4 is a side view of a variable device showing another embodiment of the present invention.

* Description of the symbols for the main parts of the drawings *

10; Crankshaft 11; 1st crank rod

12; Fixing hole 13; 2nd crank rod

14a, 14b; Link 15; Shaft pin

16; Pedal shaft 17; pedal

18; Eccentric cam 19; Variable load

20a, 20b; Stone piece 21; cylinder

21 '; Cylinder rod 22; Tension Spring

23; Hinge shaft

The present invention for achieving the above object

In the crankshaft for bicycles in which the chain sprocket is fixed to both sides of the drive shaft fixedly fixed and can apply rotational driving force,

The crankshaft includes: a first crank rod having a fixing hole formed at the upper end thereof to fix the drive shaft and the shaft; The first crank rod is installed in a horizontal position with a cross position, but the pedal shaft is arranged on the lower part of the rotor, and the pedal and the eccentric cam on both sides of the pedal shaft are fixed by engaging with the serration so that the combination can be fixed without rotation. 2 crank rod; A pair of links fixed to the middle and bottom portions of the first crank rod and the top and middle portions of the second crank rod by shaft pins so that the first and second crank rods can be folded at the same time; One side is arranged at the end of the eccentric cam fixed directly to the pedal shaft of the second crank rod, and the other side is laid in the shaft pin built at the intermediate point of the first crank rod, the length of the crankshaft in accordance with the rotation of the eccentric cam It consists of a variable load that can be expanded or reduced variable.

That is, the crankshaft fixed to both sides of the drive shaft of the chain sprocket is formed by a pair of crank rods, and the pair of crank rods are connected to each other by a link for easy folding, so that the eccentric cam moves the variable rod according to the rotational movement of the pedal. By pushing and pulling, the length of the crankshaft can be expanded or reduced to the maximum or minimum, thereby maximizing the driving energy with minimum physical energy.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view showing a crankshaft variable device according to the present invention,

2 is a side view showing an operating state of the crankshaft variable apparatus according to the present invention.

Variable device of the crankshaft for driving the bicycle according to the present invention is fixed to the upper end so as to be fixed to the drive shaft (2) of the chain sprocket (1) that can apply the driving force of the bicycle as shown in Figs. 12) is perforated to prevent slipping during rotational driving on both sides of the first crank rod 11 having the recessed groove 11 'formed in the middle portion, and the pedal shaft 16 arranged on the lower end. After the pedal 17 and the eccentric cam 18 is fixed to engage with the serration, and the second crank rod 13 having a recess formed in the middle portion of the stopper groove 13 ', the first And the stopper grooves 11 'and 13' formed in the middle portion of the two crank rods 11 and 13 with the stopper grooves 11 'and 13' facing each other in a slightly staggered state. Links 14a and 14b were connected to each other by shaft pins 15 so as to fold the first and second crank rods 11 and 13 ends.

At this time, the pedal 17 and the eccentric cam 18 fixed to both sides of the pedal shaft 16 may be transmitted without the rotational force of the pedal 17 being slipped to the eccentric cam 18 when the pedal 17 is driven. It is most preferable that the coupling so as to engage in the serration, so that the rotation force of the pedal 17 can be transmitted only to the eccentric cam 18 so as to be coupled at a constant angle, the stopper grooves 11 'and 13'. Is preferably formed to prevent the first and second crank rods 11 and 13 from flipping back when a force is applied to the first and second crank rods 11 and 13 in the rotational driving direction.

And the rotation of the eccentric cam 18 between the end of the eccentric cam 18 fixed to the other side of the pedal 17 and the shaft pin 15 of the link 14a constructed at the intermediate point of the first crank rod 13. In accordance with the first and second crank rods (11, 13) the length of the variable rod 19 that can be changed to be expanded or reduced to be built.

3 is a side view of another embodiment of a variable device according to the present invention;

A first crank rod in which a fixing hole 12 is drilled at the upper end and a stopper groove 11 'is recessed in the middle portion so as to be fixed to the drive shaft 2 of the chain sprocket 1 capable of applying the driving force of the bicycle. (11) and a second crank rod (13) in which a pedal (17) that is easy to rotate is arranged on one side of the pedal shaft (16) fixed to the lower end, and a stopper groove (13 ') is formed in the middle portion. ), The stopper grooves 11 'and 13' recessed in the middle portion of the first and second crank rods 11 and 13 are positioned to face each other in a slightly staggered state. The links 14a and 14b were connected to the ends of the 11 and 13 crank rods 11 and 13 and the shaft pins 15 for easy folding.

In this case, the stopper grooves 11 'and 13' are provided with the first and second crank rods 11 and 13 flipped back when a force is applied to the first and second crank rods 11 and 13 in the rotational driving direction. It is preferable to form so that it can prevent that.

In addition, protrusions 20a and 20b are formed to protrude from the lower ends of the first crank rod 11 and the link 14a, and the cylinder 21 flows inside the protrusions 20a and 20b. The first and second crank rods 11 and 13 are installed in the cylinder rod 21 'of the cylinder 21 so that tension springs 22 can be always pulled to rotate the cylinder rod 21'. It is to be able to vary the length of the expansion or contraction.

Figure 4 shows another embodiment of the present invention, the first crank perforated fixing hole 12 in the upper end to be fixed to the drive shaft (2) of the chain sprocket (1) that can apply the driving force of the bicycle Rods 11 and second sides of the pedal shaft 16 arranged on the lower end of the rotor shaft to secure the pedal 17 and the eccentric cam 18 to be engaged with serrations to prevent slippage during rotational driving. After the crank rod 13 was provided, the end portions of the first and second crank rods 11 and 13 were stacked with the hinge shaft 23.

At this time, the pedal 17 and the eccentric cam 18 fixed to both sides of the pedal shaft 16 may be transmitted without the rotational force of the pedal 17 being slipped to the eccentric cam 18 when the pedal 17 is driven. It is most preferable to combine so as to engage with the serration, so that the rotational force of the pedal can only be transmitted to the eccentric cam 18 by being coupled at a constant angle to the first and second crank rods 11 and 13. When the force is applied in the rotational driving direction, the first and second crank rods 11 and 13 may be bent inward at an angle to the inside to apply the force so as to prevent the back from flipping back.

In addition, at the end of the eccentric cam 18 fixed to the other side of the pedal 17 and the intermediate point of the first crank rod 13, the first and second crank rods 11 and 13 according to the rotation of the eccentric cam 18. The length of the variable rod 19 that can be changed to expand or contract the length of the) was built.

The operation and effect of the present invention configured as described above are fitted with fixing holes 12 drilled in the first crank rod 11 of the crankshaft 10 on both sides of the drive shaft 2 of the chain sprocket 1 of the bicycle as shown in FIG. It is fixed in a non-slip state, and fixed to the crankshaft 10 on both sides to be positioned on the 180 ° line from the drive shaft (2) as usual, and then the lower end of the second crank rod 13 when driving to advance the bicycle Stepping on the pedal 17 fixed to the pedal shaft 16 of the pedal shaft 16, the rotational force of the pedal 17 rotates the eccentric cam 18 of the other side through the pedal shaft 16 and the end of the eccentric cam 18 And a variable rod 19 arranged in the middle portion of the first crank rod 11 to expand and vary the maximum when the pedal 17 is pressed within the rotation radius and to the minimum with the minimum energy. To maximize the driving energy.

That is, when the pedal 17 is pressed in the advancing direction to obtain driving energy when the crankshaft 10 rotates, the variable rod 19 is pushed by the rotational force of the eccentric cam 18 while moving out of the vertical line of the crankshaft 10. Since the links 14a and 14b connecting the first and second crank rods 11 and 13 are gradually expanded and rotated to the maximum on the horizontal line, they play the role of levers and consume minimal physical energy. After the crankshaft 10 is out of the horizontal line, the first and second crank rods 11 and 13 of the crankshaft 10 are pulled while pulling the variable rod 19 by the rotational force of the eccentric cam 18. As the linked links 14a and 14b are gradually retracted, they are reduced and reduced to the minimum at the maximum extended opposite position so that the lift of the pedal 17 can be smoothed. Will be done.

3 is a side view showing another embodiment of the present invention, in which both sides of the drive shaft 2 of the chain sprocket 1 of the bicycle are provided with fixing holes 12 drilled in the first crank rod 11 of the crankshaft 10. To be fixed without slipping, and the crankshaft 10 on both sides is fixed such that the crankshaft 10 is positioned 180 ° from the driving shaft 2 as usual, and then the second crank rod 13 ends when driving to advance the bicycle. Stepping on the pedal 17 in the state of being rotated on the pedal shaft 16 of the pedal 17, the rotational force of the pedal 17 is rotated as usual with respect to the pedal shaft 16, the first time the rotation of the crankshaft 10 1 When the cylinder rod 21 'of the cylinder 21 provided between the crank rod 11 and the protrusion pieces 20a and 20b of the link 14a steps on the pedal 17 within the rotation radius, the cylinder rod 21' ) Is the maximum variable length and the cylinder rod (21 ') is minimized by the tension of the tension spring 22 when lifting Shrink variable is to maximize the energy of the maximum drive with the minimum of energy.

That is, when the pedal 17 is stepped in the advancing direction to obtain driving energy when the crankshaft 10 rotates, the protrusion 20a of the first crank rod 11 and the link 14a of the crankshaft 10 is out of the vertical line. The links 14a and 14b connecting the first and second crank rods 11 and 13 are gradually released while the cylinder rod 21 'of the cylinder 21 installed to flow between the two sides 20b is pulled out by the stepping force. As it is stretched and rotated to the maximum on the horizontal line, it plays a role of lever, so the minimum physical energy is consumed, and the crankshaft 10 extends between the cylinder rods 21 'from the horizontal line. 22 is a link 14a and 14b connecting the first and second crank rods 11 and 13 of the crankshaft 10 while pulling the cylinder rod 21 'into the cylinder 21 by the spring force. Is slowly retracted and variable to the minimum at the maximum stretched opposite position Is as small that a smooth lifting of the pedal 17 will, while continuously repeats the operation as described above is that the variable valve.

Figure 4 shows a variable device according to another embodiment of the present invention, the fixed hole 12 perforated in the first crank rod 11 of the crankshaft 10 on both sides of the chain sprocket drive shaft (2) of the bicycle It is fixed in a non-slip state, and fixed to the crankshaft 10 on both sides to be positioned on the 180 ° line from the drive shaft (2) as usual, then the lower end of the second crank rod 13 when driving to advance the bicycle When the pedal 17 is engaged by the serration of the pedal shaft 16, the pedal 17 rotates the eccentric cam 18 on the other side via the pedal shaft 16 and ends the eccentric cam 18. And operating the variable rod 19 arranged in the middle of the first crank rod 11, the maximum variable when stepping on the pedal 17 within the rotation radius, and the maximum variable with the minimum energy when it is lifted down. It is possible to maximize the driving energy.

That is, when the pedal 17 is pressed in the advancing direction to obtain driving energy when the crankshaft 10 rotates, the variable rod 19 is pushed by the rotational force of the eccentric cam 18 while moving out of the vertical line of the crankshaft 10. The first and second crank rods 11 and 13 are extended along the hinge shaft 23 connecting the first and second crank rods 11 and 13 to the horizontal line, and are rotated at the same time. Since the lever acts as a minimum physical energy is consumed, the crankshaft 10 is out of the horizontal line from the crankshaft 10 while pulling the variable rod 19 by the rotational force of the eccentric cam 18 As the first and second crank rods 11 and 13 are collapsed around the hinge shaft 23 connecting the first and second crank rods 11 and 13, the first and second crank rods 11 and 13 are variably reduced to the minimum at the oppositely extended positions. Lifting of the pedal 17 is smooth, and the above operation is repeated continuously. While that would be a variable drive.

As described above, the present invention forms a crankshaft fixed to both sides of the drive shaft of the chain sprocket by a pair of crank rods, the pair of crank rods are connected to each other by a link for easy folding, according to the rotational movement of the pedal As the eccentric cam pushes and pulls the variable rod, the length of the crankshaft can be expanded or reduced to the maximum or minimum, thereby maximizing the driving energy with minimum physical energy.

In addition, the present invention is to increase the compatibility by allowing the drive device made of a crankshaft and variable rod connected by a link to be easily fixed to the chain sprocket drive shaft of the existing bicycle to be easily used.

Claims (4)

In the crankshaft for bicycles in which the chain sprocket is fixed to both sides of the drive shaft fixedly fixed and can apply rotational driving force, The crankshaft 10 has a first crank rod (11) formed with a fixing hole (12) to be fixed to the drive shaft (2) and the shaft on the top; The first crank rod (11) is installed in a horizontal position and staggered, but the pedal shaft (16) is installed on the lower end of the rotor, and the pedal (17) and the eccentric cam (18) on both sides of the pedal shaft (16). A second crank rod 13 which is fixedly engaged with the serration so as to be coupled and fixed without being rotated; The first and second crank rods 11 and 13 may be simultaneously folded to the shaft pin 15 at the middle and lower ends of the first crank rod 11 and the upper and middle portions of the second crank rod 13. A pair of links 14a and 14b fixed by the pair; One side is arranged at the end of the eccentric cam 18 fixed to the pedal shaft 16 of the second crank rod 13, and the other side to the shaft pin 15 arranged at the intermediate point of the first crank rod 11 Crankshaft variable device for driving a bicycle, characterized in that consisting of a variable rod (19) that can expand or reduce the length of the crankshaft (10) in accordance with the rotation of the eccentric cam (18). 3. The stopper groove (11 ') (13') according to claim 1, wherein the inner side of the first and second crank rods (11) (13) is fixed to both sides of the drive shaft (2) of the chain sprocket (1). Crankshaft variable device for driving a bicycle, characterized in that the recess is formed. 2. The crankshaft 10 according to claim 1, wherein the crankshafts 10 fixed to both sides of the drive shaft 2 of the chain sprocket 1 are arranged with hinge shafts 23 between the ends of the first and second crank rods 11 and 13, respectively. Crankshaft variable device for driving a bicycle, characterized in that the. In the crankshaft for bicycles in which the chain sprocket is fixed to both sides of the drive shaft fixedly fixed and can apply rotational driving force, The crankshaft 10 has a first crank rod (11) formed with a fixing hole (12) to be fixed to the drive shaft (2) and the shaft on the top; The first crank rod 11 is installed in the horizontal position and staggered position, the lower end of the pedal shaft 16 is fixed, one side of the pedal shaft 16 is easy to rotate the pedal 17 by A second crank rod 13; The first and second crank rods 11 and 13 may be simultaneously folded to the shaft pin 15 at the middle and lower ends of the first crank rod 11 and the upper and middle portions of the second crank rod 13. A pair of links 14a and 14b fixed by the pair; The first crank rod 11 and the lower end of the link 14a are projected to form protrusions 20a and 20b in a state of being maintained at a predetermined distance, and the cylinder 21 is formed to flow inside the protrusions 20a and 20b. However, the crankshaft variable device for driving a bicycle, characterized in that by installing a tension spring 22 in the cylinder rod (21 ') of the cylinder (21).