KR20000017410U - Forward driving gear for bicycle - Google Patents

Abstract

The present invention relates to a forward drive converter for a bicycle, the configuration is a pedal shaft that is rotatably inserted into the boss of the frame to be rotated with the pedal, and spaced apart at predetermined intervals so as not to interfere with the rotation on the pedal shaft The inner disk and the outer support ring, the reverse drive wheel which is supported in contact with the inner circumferential surface of the outer support ring, and is arranged concentrically spaced around the reverse drive wheel and rolled on each outer circumferential surface of the inner disk and the outer support ring. A forward drive wheel contacted and externally formed with a driving sprocket, a direction change relay gear for inducing a forward rotational force to the drive sprocket by transmitting a rotational driving force of the reverse drive wheel, and the outer support Pedal bar located adjacent to the outside of the ring Is rotated in the same direction when rotated in a predetermined direction, and a bidirectional ratchet for receiving on the inner peripheral surface of the housing to selectively transmit the rotational force in the predetermined direction of the housing to the forward and reverse drive wheels will be. Accordingly, the pedal is automatically switched to the forward rotation state even when the pedal is rotated in reverse direction, thereby enabling the bicycle to always move forward.

Description

Forward driving gear for bicycle {Forward driving gear for bicycle}

The present invention relates to a forward drive converter for a bicycle, and more particularly, to a forward drive converter for transmitting a power so that the bicycle is always forward by automatically switching to the forward rotation state of the pedal in the reverse rotation drive.

In general, the driving device of the bicycle is composed of a drive and driven sprockets installed on the pedal shaft and the rear wheel hub shaft, respectively, and a chain connecting them, and in a predetermined direction (bicycle forward direction, ie, forward direction) to the drive sprocket. A clutch mechanism is provided to rotate only when a rotational driving force of.

When the driver rotates the pedal in the forward direction, the bicycle driving device transmits the rotational driving force from the driving sprocket to the driven sprocket by the chain and rotates the hub shaft through the clutch mechanism, thereby driving forward as the rear wheel rotates. When the driver does not apply force to the pedal or rotates in the reverse direction, the clutch shaft is idled by blocking the clutch mechanism from being transmitted to the rear wheel, and the bicycle continues to move forward by inertia.

Therefore, the conventional bicycle drive device is capable of forward driving only by forward rotation of the pedal, so that not only the driving operation of the pedal is monotonous, but also the thigh muscle fatigue caused by the one-way operation of the pedal has been accumulated in the body during long driving. In order to alleviate muscle fatigue, there is a problem that the motorist loses the inertia force of the bicycle while the pedal shaft is idling while resting with the foot on the pedal or when the pedal is in reverse rotation. .

In recent years, in order to improve the problems of the conventional driving bicycle as described above, practical developments have been made on various forward driving converters capable of driving the bicycle forward even when the pedal is reversed.

The forward drive converter for bicycles currently being developed and put into practical use includes a drive driving unit for transmitting a driving force of a pedal shaft inserted into the boss of the frame to the driving sprocket, and a pedal that is detachably fastened to the driving driving unit. The switching drive unit for converting the reverse rotation and the idle rotation of the shaft to the forward rotation to be transmitted to the drive sprocket, and the switching lever unit to be attached to and detached from the driving driving unit in accordance with the driving operation of the driver.

In the conventional forward drive converting apparatus having such a configuration, when the driver operates the lever of the switching lever unit while driving the bicycle, the switching driving unit is coupled to the driving driving unit so that the rotational direction of the pedal is reversed by the switching driving unit during the reverse rotation of the pedal. As it is transmitted to the driving driving portion, the forward driving is possible even in the reverse driving of the pedal.

However, in the forward drive converter as described above, the driver must operate the lever of the shift lever so that the shift drive unit is coupled to the drive driving unit when the forward drive is driven by the reverse rotation of the pedal while the bicycle is being driven, and the forward drive of the pedal forward When the driver wants to return to the driving state or the driver tow-moves the bicycle, the switch has to be operated again so that the switching drive is disengaged from the driving driving part, thereby causing inconvenience in driving the bicycle.

In addition, the forward drive converter has a very complicated structure consisting of a plurality of parts of the switching drive unit and the switching lever portion has a problem that leads to a decrease in productivity and an increase in manufacturing costs due to the increase in the assembly process.

The present invention is devised to solve all the problems of the conventional forward drive converter as described above, the main purpose of the combined state of the interior only by the pedal operation of the driver to apply the driving force in the forward or reverse direction without a separate lever operation It is to provide a forward drive conversion device for the bicycle that can promote the convenience of driving by enabling the forward drive while the automatic conversion.

Another object of the present invention is to provide a forward drive conversion device for a bicycle, which generates less load due to friction between coupling parts even when driving forward by a reverse rotation operation of the pedal, and obtains a reduced rotational ratio compared to forward rotation.

Still another object of the present invention is to provide a forward drive conversion device for a bicycle, which is easy to repair and replace due to easy repair and replacement of the structure by forming a structure that constitutes a forward drive conversion of the bicycle as a single assembly.

Another object of the present invention to achieve a simple structure using a small number of parts can be expected to improve the productivity by reducing the bicycle assembly process, to provide a forward drive conversion device for a bicycle that can reduce the production cost.

Still another object of the present invention is to provide a forward drive converter for a bicycle, by which the rear wheel is freely rotated, thereby facilitating the towing movement of the bicycle.

1 is an exploded perspective view showing a part of the coupling structure of the forward drive conversion apparatus for bicycles according to the present invention.

Figure 2 is a combined cross-sectional view of the forward drive conversion device for bicycles according to the present invention.

Figure 3 is a perspective view showing the structure of a bidirectional ratchet applied to the forward drive conversion apparatus according to the present invention.

Figures 4a and 4b is an operating state diagram schematically showing a forward drive mechanism of the forward drive converter according to the present invention when the pedal is rotated in any direction,

Figure 4a is a power transmission state according to the latching state of the bidirectional ratchet when the pedal is operated in the forward direction (right screw fastening direction),

Figure 4b is a power transmission state according to the latching state of the bidirectional ratchet when the pedal is operated in the reverse direction (right screw release direction).

Fig. 5 is a partial operation state diagram showing a latching state of the bidirectional ratchet applied to the forward drive converter according to the present invention when the pedal is rotated in an arbitrary direction.

※ Explanation of codes for main parts of drawing

One ; Frame 2; boss

3; Bearing bushing 4; Pedal Bar

5; Pedal shaft 6; Pedal Bar Fixing Nuts

10; Inner disk 11; Pedal Shaft Insert

12, 22; Gear shaft fixing hole 13; Bearing ball

14; Fixed step 15; Ball contact surface

20; Outer support ring 30; housing

31; Housing body 32; Pedal Bar Stuck

33; Ratchet mounting groove 40; Drive sprocket

50; Forward drive wheel 51; Forward Ratchet Gears

52; Inner peripheral surface side gear 60; Reverse drive wheel

61; Reverse ratchet gear 62; Outer peripheral side gear

70; Bidirectional ratchet 71; Ratchet body

72; Locking end 73; Axis of rotation

74; Spring seat 75; Compression Spring

80; Turning relay gear 82; Gear shaft

The forward drive converter for bicycle according to the present invention for achieving the above object is inserted so as to be rotatable in the boss of the frame and the pedal bar is fixed to each of the both ends protruding to both sides of the boss to rotate together with the pedal An inner disk and an outer support ring disposed to be spaced apart from each other at a predetermined interval on the pedal shaft so as to prevent interference when the pedal shaft is rotated, and an inner disk and an outer support ring rotatable on the pedal shaft. A reverse driving wheel installed between and supported by the rolling contact support on the inner circumferential surface of the outer support ring, and spaced concentrically spaced around the reverse driving wheel so as to be supported in contact with each outer circumferential surface of the inner disk and the outer support ring and outwardly. Drive sprockets And a plurality of ring-shaped forward drive wheels formed along the circumference between the inner disk and the outer support ring, and tooth-coupled therebetween so as to switch the rotation direction of the reverse drive wheel in the forward direction. A directional relay gear for inducing a forward rotational force to the kit, and fixedly mounted on the pedal shaft at a position adjacent to the outside of the outer support ring to rotate in the same direction when the pedal bar rotates in a predetermined direction. And a bidirectional ratchet configured to be selectively disposed on the inner circumferential surface of the housing to transmit rotational force in a predetermined direction of the housing to the forward and reverse driving wheels.

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

The forward drive converter for bicycle according to the present invention has a basic configuration to be mounted on the pedal shaft, will be described in detail with respect to an embodiment of the configuration.

1 to 5 show an embodiment in the case of mounting the forward drive converter according to the present invention to the pedal shaft (5), Figures 1 and 2 are combined of the forward drive converter for bicycle according to the present invention Figure 3 is an exploded perspective view and a combined cross-sectional view showing the structure, Figure 3 is a perspective view showing the structure of the bidirectional ratchet 70 applied to the forward drive converter of the present invention, Figures 4a and 4b is a pedal in any direction 4A is a diagram showing an operating state of the forward drive mechanism of the forward drive converter according to the present invention when rotated. FIG. 4A shows the state of the bidirectional ratchet 70 when the pedal is operated in the forward direction. Power transmission state, Figure 4b shows the power transmission phase according to the locking state of the bidirectional ratchet 70 when the pedal is operated in the reverse direction (right screw release direction). Will the shown, respectively, Figure 5 shows the pedal, respectively the engaging portion of the operating state diagram illustrating states of a two-way ratchet 70 is applied to the forward drive converter of the subject innovation when rotated in any direction.

As shown in the drawings, the forward drive converter for bicycle according to an embodiment of the present invention, in order to transmit the driving force to the rear wheel of the bicycle via a chain, in the boss (2) of the bicycle frame (1) A pedal shaft 5 which is inserted to be rotatable in the pedal bar 4 and is fixed to the both ends of the bosses 2 protruding to both sides of the boss 2 and integrally fixed to the pedal bar 4, respectively, An inner disk 10 and an outer support ring disposed on the pedal shaft 5 at predetermined intervals and supporting the rotation of the pedal shaft 5 so as not to cause interference when the pedal shaft 5 is rotated through a bearing bush 3 therebetween; 20 and between the inner disk 10 and the outer support ring 20 so as to be rotatable on the pedal shaft 5, the bearing bush 3 on the inner circumferential surface of the outer support ring 20; Reverse drive wheels 60 which are supported by rolling contact with each other, and are spaced concentrically around the reverse drive wheels 60 to support rolling contact on each outer circumferential surface of the inner disk 10 and the outer support ring 20. And a plurality of ring-shaped forward driving wheels 50 having integrally formed drive sprockets 40 and an outer side of the inner disk 10 and the outer support ring 20. By the tooth coupling therebetween so as to be able to switch the rotation direction of the drive wheel 60 in the forward direction, the direction change relay gear 80 for inducing a forward rotational force to the drive sprocket 40 and the outer support ring ( A housing 30 fixedly installed on the pedal shaft 5 at a position adjacent to the outside of the housing 20 so as to rotate in the same direction when the pedal bar 4 rotates in a predetermined direction; And, it is accommodated on the inner peripheral surface of the housing 30 consists of a bidirectional ratchet 70 for selectively transmitting the rotational force in a predetermined direction of the housing 30 to the forward, reverse drive wheels 50, 60 have.

Forward ratchet gears 51 and reverse ratchet gears 61 protruding from each other are formed to protrude from the side circumferences of the forward driving wheel 50 and the reverse driving wheel 60, respectively, and the direction change relay gear 80 is formed. The inner peripheral surface side gear 52 and the outer peripheral surface side gear 62 are formed in the inner peripheral surface of the forward drive wheel 51 and the outer peripheral surface of the reverse drive wheel 60 which contact | connect.

The drive sprocket 40 preferably stacks a plurality of drive sprockets 40 having different diameters so as to allow a multi-stage shift for adjusting a rotation ratio during a bicycle driving.

In addition, the housing 30 forms a pedal bar locking protrusion 32 protruding to a predetermined height so that the pedal bar 4 can rotate while being caught outside the housing body 31 on the disc, and the housing 30 On one side of the inner circumferential surface of the ratchet installation grooves 33 that can accommodate the ratchet 70 is formed.

In addition, the bidirectional ratchet 70 is a ratchet body 71 is radially disposed so that the ratchet body 71 can be caught by the teeth of the forward ratchet gear 51 and the reverse ratchet gear 61, the ratchet body having a predetermined length Wedge-shaped locking end 72 is formed in the vertical direction of the upper and lower sides of the 71 to form a bent shape, and the central portion of the ratchet body 71 is elastic from the ratchet installation groove 33 by the compression spring 75. It is supported, the rotary shaft surface 73 is formed at the longitudinal side end of the ratchet body 71 to be rotatable within the inner circumferential surface of the housing (30).

In addition, the direction change relay gear 80 is the both ends of the gear shaft 82 is rotatably fixed between the gear shaft fixing holes 12, 22 of the inner disk 10 and the outer support ring 20. On the other hand, it is preferable that a plurality is provided at a position symmetric about the pedal shaft (5).

Although not specifically shown in the drawings in this embodiment, a plurality of positions at the position where the rotational interference of the forward and reverse driving wheels 50 and 60 does not occur between the inner disk 10 and the outer support ring 20. Support rods can be arranged to be firmly connected to each other.

In addition, the contact portion between the outer circumferential surface of the inner disk 10 and the outer support ring 20 and the forward drive wheel 50 and the contact portion between the reverse drive wheel 60 and the outer support ring 20 are mutually rotated at each rotation. A plurality of bearing balls 13 are interposed at regular intervals so as to make rolling contact without interference, and the bearing balls 13 function to minimize friction and power loss.

In the figure, reference numeral 11 is a pedal shaft insertion hole, 14 is formed on the inner surface of the pedal shaft insertion hole 11 of the inner disk 10 to secure the inner disk 10 to the outer peripheral surface of the boss (2) To fix the step, 15 is a ball contact surface for seating the bearing ball 13, 74 shows a spring seat for seating the compression spring (75).

Referring to the operation of the converter according to the present embodiment having the configuration as described above is as follows.

First, when the pedal shaft 5 rotates in the forward direction, as shown in FIGS. 4A and 5, the pedal bar 4 pushes the pedal bar locking protrusion 32 of the housing 30 in the right screw tightening direction. The housing 30 is driven in the forward direction, and the latching end 72 of the bidirectional ratchet 70 engaged with the forward ratchet gear 51 is elastically supported in the ratchet installation groove 33 of the housing 30. The tooth coupling is made between them in the state to rotate the forward driving wheel 60 in the forward direction, and eventually driving the bicycle while driving the sprocket 40 integrally connected with the forward driving wheel 60 forward driving forward Let's go. At this time, the rotational force is also transmitted to the reverse driving wheel 60 through the direction change relay gear 80, but since the reverse ratchet gear 61 is not tooth-coupled with the bidirectional ratchet 70, the reverse driving wheel 60 is Will be idle.

Next, when the pedal shaft 5 rotates in the reverse direction, as shown in FIGS. 4B and 5, the pedal bar 4 moves the pedal bar engaging protrusion 32 of the housing 30 in the right-hand release direction. The housing 30 is driven in the reverse direction, and in the ratchet installation groove 33 of the housing 30, the engaging end 72 of the bidirectional ratchet 70 engaged with the forward ratchet gear 51 is elastic. In the supported state, while leaving the inclined surface of the forward ratchet gear 51, the opposite end 72 is tooth-coupled with the reverse ratchet gear 61 of the reverse drive wheel 60. At this time, the bidirectional ratchet 70 has both latching end portions 72 by the ratchet body 71 as the rotating shaft by the action of the rotating shaft surface 73 contacting therein along the curved surface of the ratchet installation groove 33. It is to be rotated, while the tooth coupling is made between them to rotate the reverse drive wheel 60 in the reverse direction, the direction of the relay relay gear 80 meshed with this is converted to the direction of rotation, and eventually the direction of the relay relay (80) ) And the forward driving wheel 50 and the driving sprocket 40 which rotate in engagement with each other rotate forward to drive the bicycle forward.

Accordingly, when the pedal of the bicycle is rotated forward and backward, it is possible to automatically convert the driving forward at all times even without complicated lever operation as in the prior art.

According to the forward drive conversion device for bicycles according to the present invention as described above, it is very convenient to operate the drive forward by only forward or reverse rotation of the pedal without a separate lever operation, very convenient operation, fewer parts By using simple structure, it is possible to improve productivity and reduce production cost by reducing assembly process. It also has the advantage of easy maintenance such as repair and replacement of parts. It maintains its own shifting function.

In addition, the forward drive conversion device for bicycles according to the present invention is capable of transmitting the driving force while minimizing the generation of the load due to friction between the coupling parts during the forward drive by the reverse rotation operation of the pedal, there is no power loss and the efficiency is improved There is.

As described above, the present invention has been described only for the preferred embodiments, but it is apparent to those skilled in the art that various modifications and changes can be made within the scope of the technical idea of the present invention based on the above embodiments. And it is obvious that the modification belongs to the utility model registration claims attached.

Claims (4)

A pedal shaft inserted into the boss of the frame to be rotatable, and pedal bars being integrally fixed to both ends protruding to both sides of the boss to rotate together with the pedals; An inner disk and an outer support ring disposed to be spaced apart at predetermined intervals from the pedal shaft to support interference of the pedal shaft when rotation occurs; A reverse driving wheel installed between the inner disk and the outer support ring so as to be rotatable on the pedal shaft and supported in rolling contact with the inner circumferential surface of the outer support ring; A ring-shaped forward drive wheel disposed concentrically spaced around the reverse drive wheel to be supported in contact with each outer circumferential surface of the inner disk and the outer support ring and integrally formed with a driving sprocket on the outside; A plurality of axially arranged along the circumference between the inner disk and the outer support ring, and teeth are coupled therebetween so as to be able to switch the rotation direction of the reverse drive wheel in the forward direction, the direction change for inducing a forward rotational force to the drive sprocket Relay gear; A housing fixedly installed on the pedal shaft at a position adjacent to the outside of the outer support ring to rotate in the same direction when the pedal bar rotates in a predetermined direction; And A bidirectional ratchet received on an inner circumferential surface of the housing to selectively transmit a rotational force in a predetermined direction of the housing to the forward and reverse driving wheels; Bicycle forward drive inverter, characterized in that consisting of. The method of claim 1, Forward ratchet gears and reverse ratchet gears having different directions from each other are formed to protrude from the side circumferences of the forward driving wheel and the reverse driving wheel, respectively, on the inner circumferential surface of the forward driving wheel and the outer circumferential surface of the reverse driving wheel which are in contact with the turning relay gear. The forward drive converter for bicycles, characterized in that the inner peripheral surface gears and the outer peripheral surface gears are formed. The method of claim 1, The housing is formed on the outer side of the housing body on the disc to form a pedal bar locking projection protruding to a predetermined height so that the pedal bar is rotated, and on one side of the inner peripheral surface of the housing to form a ratchet installation groove that can accommodate the bidirectional ratchet The drive forward drive for the bicycle, characterized in that. The method of claim 1, The bidirectional ratchet has a wedge-shaped locking end portion formed in the upper and lower sides of the ratchet body having a predetermined length to form a bent shape, the central portion of the ratchet body is elastically supported by a compression spring, The forward drive converter for bicycles, characterized in that the rotating shaft surface is formed to be rotatable within the inner circumferential surface of the housing.