KR200447303Y1 - Crank set of bicycle - Google Patents

Crank set of bicycle Download PDF

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Publication number
KR200447303Y1
KR200447303Y1 KR2020090009288U KR20090009288U KR200447303Y1 KR 200447303 Y1 KR200447303 Y1 KR 200447303Y1 KR 2020090009288 U KR2020090009288 U KR 2020090009288U KR 20090009288 U KR20090009288 U KR 20090009288U KR 200447303 Y1 KR200447303 Y1 KR 200447303Y1
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KR
South Korea
Prior art keywords
crank
bicycle
tube
roller
crank arm
Prior art date
Application number
KR2020090009288U
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Korean (ko)
Inventor
한상만
Original Assignee
한상만
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Publication date
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Priority to KR2020090009288U priority Critical patent/KR200447303Y1/en
Application granted granted Critical
Publication of KR200447303Y1 publication Critical patent/KR200447303Y1/en

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M1/00—Rider propulsion of wheeled vehicles
    • B62M1/36—Rider propulsion of wheeled vehicles with rotary cranks, e.g. with pedal cranks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B62M3/003—Combination of crank axles and bearings housed in the bottom bracket
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
    • B62M—RIDER PROPULSION OF WHEELED VEHICLES OR SLEDGES; POWERED PROPULSION OF SLEDGES OR SINGLE-TRACK CYCLES; TRANSMISSIONS SPECIALLY ADAPTED FOR SUCH VEHICLES
    • B62M3/00—Construction of cranks operated by hand or foot
    • B62M3/08—Pedals

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Mechanical Engineering (AREA)
  • Transmission Devices (AREA)

Abstract

The present invention relates to a crank set of a bicycle. More specifically, a crank set of a bicycle that performs pedaling within a certain range by configuring a one-way clutch bearing part connected to a crank shaft on both crank arms of the bicycle. It is about.

According to the present invention, a crank shaft rotatably fitted to a lower bracket shell of a frame including a top tube, a seat tube, and a down tube, a chain ring fitted to the crank shaft, and fixed to both ends of the crank shaft. In the crank set of the bicycle is configured to include a drive unit for transmitting a rotational driving force to the chain ring, the drive unit is a one-way clutch bearing portion coupled to the both ends of the crank shaft and the one-way clutch bearing portion And a crank arm protrudingly extended to the end, and a pedal rotatably coupled to the end of the crank arm, the wire connecting each end of the crank arm to rotate relative to the crank arm within a predetermined angle range. And a roller support tube that horizontally connects the seat tube and the down tube via a built-in bearing. It is characterized in that comprises a roller for supporting the wire.

 Bicycle, crank, unidirectional clutch bearing

Description

Crank set of bicycle}

The present invention relates to a crank set of a bicycle. More specifically, a crank set of a bicycle that performs pedaling within a certain range by configuring a one-way clutch bearing part connected to a crank shaft on both crank arms of the bicycle. It is about.

A bicycle generally means a two-wheeled vehicle that moves by rotating the wheels by human force, and the rear wheel is rotated forward by transmitting the force of the person's foot to the rear wheel through a pedal, a crank set, and a chain. .

As the bicycle moves forward / moves by human power, it can not only achieve two purposes of health promotion and movement at the same time, but also reduce the operation of the car by using the bicycle, thereby saving energy and reducing air pollution. You can expect

1A is a front view of a general bicycle, and FIG. 1B is an exploded perspective view of a crank set of a general bicycle.

As shown in Figures 1a and 1b conventional conventional bicycle frame is made by welding several tubes; Front wheel 105 and rear wheel 107; A crank set including a crank shaft 109 rotatably fitted to the lower bracket shell 108, a chain ring 111, and a drive unit 130; A sprocket 113 coupled to the rotating shaft of the rear wheel 107; And a chain 151 connecting the chain ring 111 and the sprocket 113, wherein the frame is located at the top of the bicycle, one end of which is connected to the head tube 117, and the other side of which is connected to the seat clamp 118. Top tube 119 to be connected; A seat tube 121 integrally formed in the seat clamp 118 in a downward direction; And a down tube 122 connecting the head tube 117 and the seat tube 121, and the driving unit 130 is vertically coupled to both ends of the crank shaft 109. ); And a pedal 125 rotatably coupled to the end of the crank arm 123.

In the conventional general bicycle having such a configuration, when the operator sits on the saddle 127 of the bicycle and presses the pedal 125 with the foot to rotate the crank arm 123 in one direction, the crank shaft 109 connected thereto is rotated, and at the same time, the crank As the chain ring 111 connected to the shaft 109 is rotated, the sprocket 113 is rotated through the chain 115 so that the rear wheel 107 is rotated to move the bicycle forward.

At this time, the sprocket 113 of the rear wheel 107 is generally equipped with a free wheel so that the rear wheel 107 is rotated by the rotation driving force only when the pedal 125 is rotated in the direction in which the bicycle moves forward, and the pedal When turning 125 in the opposite direction, the rotational driving force is not transmitted to the rear wheel 107.

By the way, when the driver applies a force to the pedal 125 to advance the conventional general bicycle of such a configuration, the rotational driving force transmitted to the rear wheel 107 according to the rotation angle of the pedal 125 is as shown in Figure 1c Draw a graph.

That is, the bottom dead center (i.e., the crank arm 123) at the top dead center (i.e., the point where the crank arm 123 is located vertically upward and 0 degrees in the graph of FIG. The rotational driving force transmitted to the rear wheel 107 during the rotation to the vertical downward direction (180 ° in the graph of FIG. 1C) is a sine curve, and the pedal 125 is the top dead center. When it is located at and bottom dead center, the rotational driving force is 0%, and since the rotational driving force is provided only about 50% in the 0˚ ~ 45˚ section and the 135˚ ~ 180˚ section, the rotational driving force is provided only about 50%. There was a problem in that the output efficiency of the bicycle due to the rotational driving force transmitted to the rear wheel 107 as the operator stepped on the pedal 125, including the 0˚ ~ 45˚ section and 135˚ ~ 180˚ section that can not be.

The purpose of the present invention is to solve the above problems, the output of the bicycle by allowing the operator to pedal within the range of a certain angle (45˚ ~ 135˚) high efficiency of rotation driving force It is to provide a crank set of the bicycle to improve the efficiency.

In order to achieve the above object, a crank set of a bicycle according to the present invention includes a crank shaft rotatably fitted to a lower bracket shell of a frame including a top tube, a seat tube, and a down tube, and fitted to and fixed to the crank shaft. A crank set of a bicycle comprising a chain ring and a drive unit coupled to both ends of the crankshaft to transmit rotational driving force to the chainring, wherein the drive unit is a one-way clutch coupled to both ends of the crankshaft. And a crank arm integrally protruding from the one-way clutch bearing part, and a pedal rotatably coupled to an end of the crank arm, wherein the crank arm is rotated relatively within a range of an angle. A wire connecting each end of the crank arm to each other and the seat tube It is attached to the down tube and the roller supporting tube which is characterized in that the horizontal connection comprises a roller for supporting the wire.

And the groove is formed along the outer circumference of the roller is characterized in that the guide groove is formed.

In addition, it characterized in that the stepped protruding along the outer circumference of both ends of the roller is formed.

Subsequently, a semi-circular shape is formed at each end of the crank arm, but a wire fixing part having a hole formed in the center thereof is formed.

According to the present invention as described above, one-way clutch bearing; Crank arm; And a drive section including a pedal and a crank set of a bicycle including a wire and a roller to the bicycle, and a low efficiency 0˚ to 45˚ section and a range of 0˚ to 180˚ that provide a conventional driving force. By removing the ˚ ~ 180 ˚ section and continuously pedaling in the 45 ˚ ~ 135 ˚ section of the high efficiency of providing the rotational driving force to deliver the rotational driving force to the rear wheel, as a result there is an effect that can improve the output of the bicycle.

Further, by forming a guide groove and a step in the roller, the wire for mediating the relative rotational movement of the pedal is stably moved along the guide groove of the roller and at the same time, the wire is prevented from leaving the roller.

Hereinafter, with reference to the accompanying drawings will be described in detail a preferred embodiment of the crank set of the bicycle according to the present invention.

Figure 2a is an enlarged plan view of the bicycle and the roller is equipped with the subject innovation, Figure 2b is an exploded perspective view of the drive unit according to an embodiment of the present invention.

As shown in FIGS. 2A and 2B, the crank set of the bicycle according to the embodiment of the present invention includes a lower bracket shell 250 of a frame including a top tube 219, a seat tube 221, and a down tube 223. Crank shaft 209 that is rotatably fitted to the crank shaft, a chain ring 211 fitted to the crank shaft 209 and fixed to both ends of the crank shaft 209 and fixed to the chain ring 211. It comprises a drive unit 260 for transmitting a rotational driving force, the drive unit 260 is a one-way clutch bearing unit 231 is fixed to both ends of the crank shaft 209, and the one-way clutch bearing A crank arm 233 integrally protruding from the part 231, and pedals 225: 225a and 225b rotatably coupled to the ends of the crank arm 233, and further including the crank of the bicycle. The set is relative to the crank arm 233 in the range of a certain angle Roller support tube 290 for horizontally connecting the seat tube 221 and the down tube 223 via the wire 270 connecting each end of the crank arm 233 and the internal bearing 292 so as to It is configured to include a roller 280 is mounted to the support for supporting the wire 270.

A guide groove 291 may be formed along the outer circumference of the roller 280, and a step 293 may be formed to protrude along the outer circumference of both ends of the roller 280. Each of the ends of the crank arm 233 may have a semicircular shape, and a wire fixing portion 295 having a hole 296 formed in the center thereof may be formed.

First, the top tube 219, the seat tube 221, the down tube 223, the crank shaft 209, the chain ring 211, and the lower bracket shell 250 illustrated in FIGS. 2A and 2B are illustrated in FIGS. 1A and 2B. Since the structure of the conventional bicycle shown in 1b is the same as the top tube 119, the seat tube 121, the down tube 122, the crank shaft 109, the chain ring 111, the lower bracket shell 108 The description will be omitted, and the driving part 260 including the one-way clutch bearing part 231, the crank arm 233, and the pedal 225, the wire 270, and the roller 280 will be described. Shall be.

As mentioned above, the driving unit 260 of the crank set of the bicycle according to the embodiment of the present invention is a one-way clutch bearing unit 231 fixed to both ends of the crank shaft 209, and the one-way clutch And a pedal 225 rotatably coupled to the end of the crank arm 233, and a crank arm 233 integrally protruding from the bearing portion 231, each end of the crank arm 233 There may be a semi-circular shape, but the wire fixing portion 295 in which the hole 296 is perforated at the center may be formed, where the one-way clutch bearing portion 231 rotates on the crank shaft 209 only when it rotates in one direction. Will be delivered.

That is, the one-way clutch bearing (also referred to as unidirectional bearing) portion 231 is separated into the outer ring 236 and the inner ring 235, but the driver rotates the crank arm 233 to be described later by stepping on the pedal 225 in one direction. Accordingly, when the outer ring 236 rotates in the same direction, the inner ring 235 also rotates in the same direction, and conversely, when the outer ring 236 rotates in the other direction, the crank arm 233 rotates in the other direction. The inner ring 235 is not to rotate.

In addition, the crank arm 233 integrally formed to protrude from the one-way clutch bearing part 231 is generated as a driver steps on and rotates the pedal 225 like the crank arm 123 (see FIG. 1B) of a conventional bicycle. The wire fixing portion 295 serves to transmit the rotational driving force to the crank shaft 209 and the chain ring 211, and each end of the wire 270 to be described later is formed at each end of the crank arm 233, respectively. It is preferable to be provided in a semicircular shape as a part to be coupled and fixed, but having a hole 296 in the center in the shape of perforation, but is not necessarily limited thereto.

That is, as long as both ends of the wire 270 to be described later, the shape and structure that can be tightly coupled to each other will be possible.

The wire 270 connects each end of the crank arm 233 so that the crank arm 233 rotates relatively within a range of angles. In particular, as mentioned above, the wire 270 is connected to the crank arm 233. It is preferable to be fixed to the wire fixing portion 295 formed at each end.

In addition, the diameter and tensile strength of the wire 270 is sufficient to provide a tensile force applied to the wire 270 when the other pedal 225b connected to the wire 270 is pulled up as the driver presses one pedal 225a. It must be decided to withstand it.

Subsequently, the roller 280 is mounted on the roller support tube 290 which horizontally connects the seat tube 221 and the down tube 223 via the internal bearing 292. The bearing 292 is a ball bearing or Needle bearings may be preferred, but are not necessarily limited thereto.

In addition, the position at which the roller 280 is mounted on the roller support tube 290 is the top dead center of the pedal 225 connected to the wire 270 (that is, the position rotated 45 ° counterclockwise with respect to the Y axis) and the bottom dead center. The center of the roller 280 is preferably positioned near the point where the line connecting the point (that is, the position rotated by 45 ° clockwise with respect to the Y 'axis) meets the roller support tube 290.

In addition, the guide groove 291 may be formed in the roller 280 along the periphery of the outer circumference, and the stepped 293 may protrude along the periphery of the outer circumference of both ends of the roller 280. 291 guides a path along which the wire 270 moves when the wire 270 moves along the outer circumferential surface of the roller 280, and the step 293 prevents the wire 270 from leaving the roller 280. do.

That is, by forming the guide groove 291 around the outer circumferential surface of the roller 280, the wire 270 can be stably moved in the state where the wire 270 is inserted into the guide groove 291, and additionally the outer peripheral surface of both ends of the roller 280 By forming the step 293 protruding along the circumference, the wire 270 moving in contact with the roller 280 may be prevented from leaving the roller 280.

When the crank set of the bicycle of the present invention of such a configuration is mounted on the bicycle, when the driver applies the force to the pedal 225 to advance the bicycle, the rotation transmitted to the rear wheel 207 according to the rotation angle of the pedal 225 The driving force is to draw a graph as shown in FIG.

That is, when 0 ° is assumed as a case where the section in which the conventional driver provides only about 50% of the rotational driving force when the pedal is pressed (that is, the crank arm 123 (see FIG. 1B) is located in the vertical upward direction) is set as 0 °. Remove the 0 ° to 45 ° section and the 135 ° to 180 ° section (see FIG. 1C) in the clockwise direction, and allow the pedal to be stepped on the 45 ° to 135 ° section (that is, the operator in the graph of FIG. 3). When one pedal 225a is stepped and rotated from 45 ° to 135 °, the other pedal 225b is rotated back from (135 °) to (45 °) by the wire 270.)

Thereafter, when the operator presses the other pedal 225b to rotate (45 °) to (135 °), the one pedal 225a rotates back from 135 ° to 45 ° by the wire 270.

In this way, the operator can continuously pedal in the 45˚ ~ 135˚ section where the efficiency of providing the rotation driving force is high (that is, between 0˚ and 180˚, which is a range in which the operator steps on the pedal and provides the rotation driving force in the related art) In the range of 0˚ ~ 45˚ and 135˚ ~ 180˚, the low efficiency of rotation driving force was included, but according to the present invention, the pedal was continuously pressed in the 45˚ ~ 135˚ section of high efficiency of rotation driving force. As a result, it is possible to improve the output of the bicycle.

In addition, the one-way clutch bearing portion 231 by replacing the present invention on the bicycle replaces the role of the free wheel that was conventionally mounted on the sprocket 113 (see FIG. 1A) of the bicycle, so that the free wheel mounted on the rear wheel may be removed. Will be.

The present invention described above is possible to those skilled in the art to which the present invention belongs, various modifications and changes can be made within the scope without departing from the technical spirit of the present invention the above-described embodiment and the accompanying drawings It is not limited to.

1A is a front view of a typical bicycle;

1B is an exploded perspective view of a crank set of a typical bicycle;

Figure 1c is a view showing a graph of the rotational driving force transmitted to the rear wheel according to the rotation angle of the conventional pedal;

Figure 2a is a plan view of the bike equipped with the subject innovation and a partially enlarged view of the roller;

2b is an exploded perspective view of a driving unit according to an embodiment of the present invention; And

Figure 3 is a view showing a graph of the rotational driving force transmitted to the rear wheel according to the rotation angle of the pedal in the bicycle equipped with the subject innovation

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

105: front wheel 107: rear wheel

108: lower bracket shell 113: sprocket

115: chain 117: head tube

119: top tube 121: sheet tube

122: down tube 123: crank arm

125: pedal 127: saddle

130: drive unit 205: front wheel

207 rear wheel 211 chainring

219: top tube 221: sheet tube

223: down tube 225: pedal

231: one-way bearing 233: crank arm

235: inner ring 236: outer ring

250: lower bracket shell 260: drive unit

270: wire 280: roller

290: roller support tube 291: guide groove

293: step 295: wire fixing part

296: Hall

Claims (4)

A crank shaft 209 rotatably fitted to the lower bracket shell 250 of the frame including the top tube 219, the seat tube 221, and the down tube 223, and fixed to the crank shaft 209. In the crank set of the bicycle comprising a chain ring 211 and a drive unit 260 is fixed to both ends of the crank shaft 209 to transmit a rotation driving force to the chain ring 211, The drive unit 260 is A one-way clutch bearing portion 231 coupled to both ends of the crank shaft 209, a crank arm 233 integrally protruding from the one-way clutch bearing portion 231, and the crank arm 233 It is configured to include a pedal 225 rotatably coupled to the end of the), The crank set of the bicycle is connected to the wires 270 connecting the ends of the crank arm 233 so that the crank arm 233 rotates relative to each other within a predetermined angle, and the bearing 292 is built in the medium. The roller 280 is mounted on the roller support tube 290 for horizontally connecting the seat tube 221 and the down tube 223 to support the wire 270. The crank set of the bicycle, characterized in that the end of the crank arm 233 is formed in a semi-circular shape, the wire fixing portion (295) perforated with a hole (296) in the center. The method of claim 1, The crank set of the bicycle, characterized in that the guide groove (291) is formed in the groove along the circumference of the outer peripheral surface of the roller (280). The method according to claim 1 or 2, Crank set of the bicycle, characterized in that the stepped (293) protruding around the outer peripheral surface of both ends of the roller (280) is formed. delete
KR2020090009288U 2009-07-17 2009-07-17 Crank set of bicycle KR200447303Y1 (en)

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Application Number Priority Date Filing Date Title
KR2020090009288U KR200447303Y1 (en) 2009-07-17 2009-07-17 Crank set of bicycle

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR2020090009288U KR200447303Y1 (en) 2009-07-17 2009-07-17 Crank set of bicycle

Publications (1)

Publication Number Publication Date
KR200447303Y1 true KR200447303Y1 (en) 2010-01-13

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KR2020090009288U KR200447303Y1 (en) 2009-07-17 2009-07-17 Crank set of bicycle

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5488743U (en) 1977-12-05 1979-06-23
JPS5662293U (en) 1979-10-20 1981-05-26
JPS646196U (en) 1987-06-29 1989-01-13
JPH11105772A (en) * 1997-10-06 1999-04-20 Chuichi Suzuki Bicycle with free wheel attached to pedal lever

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5488743U (en) 1977-12-05 1979-06-23
JPS5662293U (en) 1979-10-20 1981-05-26
JPS646196U (en) 1987-06-29 1989-01-13
JPH11105772A (en) * 1997-10-06 1999-04-20 Chuichi Suzuki Bicycle with free wheel attached to pedal lever

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