KR100764638B1 - Device for transmitting sub-driving force of a bicycle - Google Patents

Abstract

A device for transmitting sub-driving force of a bicycle is provided to control supply of sub-driving force to the rear wheel of the bicycle by using two cylinder units and a gear engaging with a rack gear. A device for transmitting sub-driving force of a bicycle comprises first and second cams(10a,10b) coupled to two sides of the crank axis of a front sprocket. First and second cylinder units(20a,20b) is couple to the front portion of a chain stay while closely making contact with the first and second cams(10a,10b), and is alternatively pumped to exhaust pressure to an exterior. A third cylinder unit(30) is couple to the rear portion of the chain stay, and has a rack gear formed at the upper side of a rod(33) linearly reciprocating by the pressure exhausted from the first and second cylinder units(20a,20b). A gear(40) is integrally formed with a rear sprocket to engage with the rack gear.

Description

Auxiliary driving force transmission device for bicycles {DEVICE FOR TRANSMITTING SUB-DRIVING FORCE OF A BICYCLE}

1 is a side view of the bicycle is installed auxiliary driving force transmission device of the bicycle according to an embodiment of the present invention.

2 is a plan view of the auxiliary driving force transmission device of the bicycle according to an embodiment of the present invention.

Figure 3a is a left side view showing a state in which the rake gear of the auxiliary drive force transmission device of the bicycle according to an embodiment of the present invention moved to the rear.

Figure 3b is a right side view showing a state in which the rake gear of the auxiliary drive force transmission device of the bicycle according to an embodiment of the present invention moved to the rear.

Figure 4a is a left side view showing a state in which the rake gear of the auxiliary drive force transmission device of the bicycle according to an embodiment of the present invention moved to the front.

Figure 4b is a right side view showing a state in which the rake gear of the auxiliary drive force transmission device of the bicycle according to an embodiment of the present invention moved to the front.

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

1: Auxiliary driving force transmission device of the bicycle 10a: First cam

10b: 2nd cam 20a: 1st cylinder mechanism

20b: 2nd cylinder mechanism 21,31: cylinder main body

22, 32: piston 23, 33: rod

23a: support portion 24: elastic member

25 discharge pipe 30 third cylinder mechanism

33a: leggear 100: bicycle

102: front wheel 104: rear wheel

106: chainstay 106a: guide

108: front sprocket 110: rear sprocket

112: pedal 114: chain

116: crankshaft

The present invention relates to an auxiliary driving force transmission device for a bicycle for providing an auxiliary driving force to a bicycle running by rotating the pedal, and more particularly by a cam that is fastened to both sides of the crankshaft of the front sprocket as the pedal rotates. The first and second cylinder mechanisms, which are pumped alternately, and the rods on which the lex gears are formed by receiving pressure discharged from the first and second cylinder mechanisms are linearly reciprocated, and are integrally formed with the rear sprocket. The present invention relates to an auxiliary driving force transmission device of a bicycle in which gears arranged to engage are rotated so that auxiliary power is supplied to the rear wheels of the bicycle.

Although bicycles are used as transportation means, they are being developed as recreational means of various functions such as transmission gears.

Bicycles which are generally used are provided with front and rear wheels and pedals which are installed in front and rear, and the front and rear sprockets which are respectively installed on the rear wheel and the crankshaft as power transmission means for transmitting the rotational force of the pedals to the rear wheels. A chain is provided between the rear sprockets, and includes a frame for supporting the components, and a saddle and a handle installed on the frame.

The operation structure of the bicycle is composed of a front sprocket rotated by the left and right pedals and a rear sprocket interlocked by the front sprocket and the chain, and the driving force is generated as the front sprocket rotates as the pedal rotates.

In addition, conventionally, a bicycle in which a rear sprocket is formed in multiple stages for the purpose of improving the driving force of the bicycle and a gear shift is possible according to driving conditions by operating a lever is used.

However, in spite of the gear shift as described above, this structure is formed so that the rotation ratio between the front sprocket and the rear sprocket is large, so that the rear sprocket is rotated two times per one revolution of the pedal, and the load is increased due to the large radius of the rear wheel. There was a difficulty in generating propulsion on an uphill road.

Accordingly, an object of the present invention is to discharge from the first and second cylinder mechanisms, which are alternately pumped by cams that are engaged on both sides of the crankshaft of the front sprocket as the pedal rotates. The auxiliary driving force transmission device of the bicycle, which is formed integrally with the rear sprocket as the rod in which the lex gear is formed is linearly reciprocated under pressure, and the gear disposed to engage the lex gear rotates to supply auxiliary power to the rear wheel of the bicycle. To provide.

The object of the present invention described above is attached to the front and rear wheels on the frame and the chain connected to the front and rear sprockets fastened on the chainstay is attached to the bicycle that transmits its power to the rear wheels, assisting the auxiliary wheel In the power transmission device for transmitting the first and second cams are fastened to be point-symmetrical to both sides of the crankshaft of the front sprocket in which the pedal is formed, and is fastened in front of the chainstay to be in close contact with the first and second cams First and second cylinder mechanisms alternately pumped to discharge pressure to the outside, and rods fastened to the outside by a pressure fastened to the rear of the chainstay and discharged from the first and second cylinder mechanisms A third cylinder mechanism in which a rack gear is formed upward, and integrally formed with the rear sprocket to engage the rack gear; It is achieved by providing an auxiliary drive force transmission device for a bicycle, characterized in that it comprises a gear that rotates as the fish reciprocates and transmits power to the rear sprocket.

According to a preferred feature of the present invention, the above-described first and second cylinder mechanisms include a cylinder body, a piston which is hermetically moved inside the cylinder body, and one side of which is connected to the piston inside the cylinder body and the cylinder on the other side. A rod having a support portion formed to be in close contact with the first and second cams outside the main body, an elastic member installed on the rod such that the support portion is grounded on the cam and elastically biased, and formed by a reciprocating motion of the piston The discharge pipe is connected to the piston body in order to discharge the pressure to the outside.

According to a further preferred feature of the invention, the above-described third cylinder mechanism, the first body and the second cylinder mechanism, the other end of the discharge pipe to which one side is connected, respectively, is connected to both ends, and the airtight inside the cylinder body The piston to be moved, and one side is to be made of a rod connected to the piston in the cylinder body inside, the lex gear is formed on the upper side of the exposed side.

According to a further preferred feature of the present invention, the aforementioned chainstay is provided with a guide for supporting the rod of the third cylinder mechanism.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, which are intended to explain in detail enough to enable those skilled in the art to easily carry out the invention. It does not mean that the technical spirit and scope of the present invention is limited.

1 is a side view of a bicycle on which the auxiliary driving force transmission device of the bicycle according to an embodiment of the present invention is shown, Figure 2 is a plan view of the auxiliary driving force transmission device of the bicycle according to an embodiment of the present invention, 3A is a left side view showing a state in which a lex gear of the auxiliary driving force transmission device for a bicycle according to an embodiment of the present invention is moved rearward, and FIG. 3B is an auxiliary driving force transmission for a bicycle according to an embodiment of the present invention. The right side view is shown showing the device's lag gear is moved to the rear, Figure 4a is a left side view showing the rake gear of the auxiliary drive force transmission device of the bicycle according to an embodiment of the present invention is moved forward. 4B is a right side view showing a state in which the lex gear of the auxiliary driving force transmission device of the bicycle according to the embodiment of the present invention is moved forward.

Auxiliary driving force transmission device 1 of the bicycle according to an embodiment of the present invention is a chain 114 is connected to the front and rear wheels (102, 104) wheels are coupled to the front and rear sprockets (108, 110) fastened on the chainstay 106 on the frame. In the power transmission device which is attached to the bicycle 100 to rotate the through the pedal 112 to transmit the power to the wheels of the rear wheel 104, and transmits power auxiliary, the front sprocket on which the pedal 112 is formed First and second cams 10a and 10b fastened to both sides of the crankshaft 116 on the crankshaft 116 and chain stays to be in close contact with the first and second cams 10a and 10b. First and second cylinder mechanisms 20a and 20b fastened to the front of the 106 and alternately pumped to discharge pressure to the outside, and fastened to the rear of the chainstay 106, and the first and second The furnace reciprocating linearly outside by the pressure discharged from the two-cylinder mechanisms 20a and 20b. (33) A third cylinder mechanism 30 having a rake gear 33a formed on the upper side thereof, and integrally formed with the rear sprocket 110 so as to be engaged with the lex gear 33a, so that the rake gear 33a is straight. And a gear 40 which rotates as the reciprocating motion transmits power to the rear sprocket 110.

Here, the first and second cams 10a and 10b are fastened to be point symmetrical to both sides of the crankshaft 116 of the front sprocket 108 on which the pedals 112 are formed. It serves to alternately pump the first and second cylinder mechanisms 20a and 20b to be described.

The first and second cams 10a and 10b described above are rotated 180 degrees outwardly and fastened symmetrically to both sides of the crankshaft 116 so that the rod of the third cylinder mechanism 30 to be described later ( 33) is preferably to be linear reciprocating to the maximum length.

The first and second cams 10a and 10b described above may be welded and fastened on the chainstay 106, and are firmly fastened through various fastening means (not shown) including a separate fastening belt. desirable.

In the above-described first and second cams 10a and 10b, the first and second cylinder mechanisms 20a and 20b, which are pumped alternately and discharge pressure to the outside, are provided with the first and second cams 10a and 10b. Fastened to the front of the chainstay 106 to be in close contact with

The first and second cylinder mechanisms 20a and 20b described above include a cylinder body 21, a piston 22 that is hermetically moved from the inside of the cylinder body 21, and one side of the cylinder body 21 inside. A rod 23 connected to the piston 22 and having a support portion 23a formed to be in close contact with the first and second cams 10a and 10b outside the cylinder body 21 on the other side, and the support portion ( 23a is formed by the reciprocating motion of the piston 22 and the elastic member 24 which is built on the rod 23 so as to be grounded on the first and second cams 10a and 10b and elastically biased. It consists of a discharge pipe 25 connected on the cylinder body 21 to discharge the pressure to the outside.

The first and second cylinder mechanisms 20a and 20b described above are closely arranged to the first and second cams 10a and 10b described above, and alternately as the first and second cams 10a and 10b rotate. By pumping and linearly reciprocating the rod 33 of the third cylinder mechanism 30, which will be described later, it serves to discharge pressure capable of rotating the rear sprocket 110.

The elastic member 24 described above is installed in the rod 23 so as to be supported on both sides of the cylinder body 21 and the support 23a, where the elastic member 24 has the support 23a having the first and second cams 10a. The elastic member 24 is elastically biased at 10b and repeatedly discharges a constant pressure to the third cylinder mechanism 30. The elastic member 24 is preferably formed of an elastic spring.

In addition, the discharge pipe 25 described above serves to discharge the pressure generated in the first and second cylinder mechanisms 20a and 20b to the third cylinder mechanism 30 which will be described later, and thus the airtightness is maintained. It is preferably formed of a rubber material.

On the rear side of the chainstay 106 to which the above-mentioned first and second cylinder mechanisms are fastened, the linear reciprocating motion to the outside is performed by the pressure discharged from the above-described first and second cylinder mechanisms 20a and 20b. The 3rd cylinder mechanism 30 in which the rack gear 33a is formed above the rod 33 is fastened.

As described above, the third cylinder mechanism 30 is formed to engage with the rack gear 33a as the rod 33 on which the gear gear 33a is formed performs linear reciprocation, and is integrally formed with the rear sprocket 110. By rotating the gear 40 serves to supply auxiliary power to the rear wheel (104).

The above-mentioned third cylinder mechanism 30 includes a cylinder body 31 having the other side of the discharge pipe 25 to which one side is connected to both ends, respectively, to the first and second cylinder mechanisms 20a and 20b, and the cylinder body. (31) A rod 32 which is hermetically moved from the inside, and one side is connected to the piston 32 inside the cylinder body 31 and a lex gear 33a is formed at an upper side of the side exposed to the outside. It consists of 33.

The rod 33 in which the lex gear 33a is formed at the upper side of the side exposed to the outside is linearly reciprocated on the cylinder body 31 of the third cylinder mechanism 30 described above. The side formed is preferably formed so as not to be drawn into the cylinder body 31.

Further, the rod 33 of the above-described third cylinder mechanism 30 is linearly reciprocated on the guide 106a extending from the chainstay 106 so as to stably engage with the gear 40 to be described later, and linearly reciprocate. It is desirable to be.

The rack gear 33a of the above-described third cylinder mechanism 30 is integral with the rear sprocket 110 so that the rack gear 33a rotates as it linearly reciprocates to transmit power to the rear sprocket 110. Gear 40 is disposed so as to form.

The above-described gear 40 is integrally formed with the rear sprocket 110, such that the rear sprocket 110 transmits power only forward because of the one way clutch (not shown). Preferably, the rod 33 of the cylinder mechanism 30 is formed such that power is transmitted only when the rod 33 linearly moves to the rear side.

3A to 4B, the overall operation of the auxiliary driving force transmission device 1 of the bicycle according to the exemplary embodiment of the present invention will be described below.

As the occupant of the bicycle 100 rotates the pedal 112, the first and second cams 10a and 10b, which are fastened symmetrically to both sides of the crankshaft 116, rotate, and the first and second The pistons 22 of the first and second cylinder mechanisms 20a and 20b, which are in close contact with the cams 10a and 10b so as to be elastically biased, are pumped alternately.

At this time, the pressure generated due to the pumping of the piston 22 is alternately discharged to the third cylinder mechanism 30 through the discharge pipe 25 connected to each cylinder body 21.

The discharge pipe 25, one side of which is connected to the first and second cylinder mechanisms 20a and 20b, is connected to both sides of the third cylinder mechanism 30, respectively. On the front side of the three cylinder mechanism 30, the discharge pipe 25 of the second cylinder mechanism 20b is connected to the rear side of the third cylinder mechanism 30, respectively.

The pressure of the first cylinder mechanism 20a causes the rod 33 of the third cylinder mechanism 30 to move to the rear side, and thus, the rack gear 33a formed on the rod 33 of the third cylinder mechanism 30. Gear 40 is engaged with the rear sprocket 110 to transmit the auxiliary power to the rear wheel (104).

In addition, the pressure of the second cylinder mechanism 20b causes the rod 33 of the third cylinder mechanism 30 to move to the front side, so that the third cylinder mechanism 30 is a rack gear formed on the rod 33. The gear 40 engaged with 33a does not transmit the auxiliary power to the wheels of the rear wheels 104 by the one-way clutch (not shown) provided in the rear sprocket 110.

As described above, the pressure transmitted by the first and second cylinder mechanisms 20a and 20b being pumped alternately continuously causes the piston 32 of the third cylinder mechanism 30 to linearly reciprocate, and thus the rear sprocket 110. Through) it is possible to transfer the auxiliary power to the rear wheel (104).

As described above, the auxiliary driving force transmission device of the bicycle according to the present invention, the first and second cylinder mechanism is pumped alternately by the cam fastened to both sides of the crankshaft of the front sprocket as the pedal rotates, As the rod from which the first and second cylinder mechanisms are discharged from the first and second cylinder mechanisms is linearly reciprocated, the rod is formed integrally with the rear sprocket. As a result, the gear disposed to engage with the lex gear rotates to assist the rear wheel of the bicycle. There is a supply effect.

Claims (4)

The front and rear wheels are coupled to the frame, and the chain connected to the front and rear sprockets fastened on the chainstay is attached to a bicycle that transmits its power to the rear wheels by a pedal, and is attached to a power transmission device that transmits power auxiliaryly. In First and second cams fastened to be point symmetrical to both sides of the crankshaft of the front sprocket on which the pedal is formed; First and second cylinder mechanisms coupled to the front of the chainstay to be in close contact with the first and second cams and alternately pumped to discharge pressure to the outside; A third cylinder mechanism fastened to the rear of the chainstay and having a lex gear formed above the rod that linearly reciprocates to the outside by the pressure discharged from the first and second cylinder mechanisms; And And a gear which is integrally formed with the rear sprocket so as to engage with the rack gear and rotates as the lex gear moves in a straight reciprocating motion, thereby transmitting power to the rear sprocket. The method of claim 1, The first and second cylinder mechanisms include a cylinder body, a piston that is hermetically moved inside the cylinder body, and one side of the cylinder body is connected to the piston inside the cylinder body and the other side of the first and second cylinder bodies outside the cylinder body. A rod having a support portion formed to be in close contact with a cam, an elastic member internally mounted on the rod such that the support portion is grounded on the cam and elastically biased, and for discharging pressure generated by the reciprocating motion of the piston to the outside A secondary driving force transmission device for a bicycle, characterized in that consisting of a discharge pipe connected to the piston body. The method according to claim 1 or 2, The third cylinder mechanism includes a cylinder body having the other side of the discharge pipe to which one side is connected to both ends, a piston which is hermetically moved from the inside of the cylinder body, and one side to the first and second cylinder mechanisms. The auxiliary driving force transmission device of the bicycle, characterized in that made of a rod connected to the piston inside the main body and the outer side is exposed to the outer gear is formed. The method of claim 3, wherein The chain stay is provided with a guide for supporting the rod of the third cylinder mechanism auxiliary drive force transmission device of the bike.

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