KR20160020737A - Front-wheel drive type safty bicycle - Google Patents

Abstract

Disclosed is a front-wheel drive safety bicycle. The front-wheel drive safety bicycle comprises: a bicycle body; a drive sprocket mounted on a rotary center shaft of a front wheel to rotate by pedaling; a crank arm having pedals attached thereto to rotate the drive sprocket; a driven sprocket mounted on a steering shaft through a rotary shaft and linked to the drive sprocket; a down frame whose one end is rotatably mounted on the steering shaft and whose the other end is connected to a support frame and a first hinge shaft to be fold and unfolded around the first hinge shaft; a hinge part connecting the down frame and the support frame; a second hinge shaft connecting the hinge part and the support frame to fold and unfold the hinge part and the support frame; a seat seated on an upper portion of the support frame; and a seat stay to support the seat around a rear wheel. Pedaling power can be directly transferred to the front wheel or power of a drive motor can be used to drive the bicycle. The bicycle has a short overall length to easily fold and unfold the bicycle. The center of a sitting position is lowered to reduce falling to increase safety.

Description

FRONT-WHEEL DRIVE TYPE SAFTY BICYCLE

The present invention relates to a front-wheel-drive safety bicycle, and more particularly, to a front-wheel-drive safety bicycle which shortens the entire length of the bicycle by transmitting the driving force generated by the footwave directly to the front wheel, facilitates folding and unfolding, will be.

Vehicles such as automobiles have worsened the environment due to pollution of the atmosphere and the environment caused by exhaust gas, and the reduction of green spaces due to the development of mountainside to meet the demand of the roads. The use and interest of bicycles has been increasing as a means of reducing vehicle driving and getting to their destination quickly, and more use is needed.

Generally, the bike has a drive unit that can steer the front wheels and rear wheels. The person who moves the tackle moves the force of the foot to the crank mechanism and turns it into the rotational force, which is then transmitted to the rear wheel through a chain hooked to the large sprocket.

The frame that forms the body of the bicycle is diamond or diamond shape and it is an important factor that determines the performance. Usually, the head tube, the top tube, the down tube, the seat stay, , And Chain Stay. The shape, length, and thickness of each body depend on the frame geometry of each body.

The restoring force, stability, and steering ability of the front tire that rubs the road surface depend on the inclination angle (casting angle) of the head tube. The front wheel is supported between the two legs of the front fork, with a hub on the left and right of the bearing affecting bicycle performance.

The hub axes of the front and rear wheels are fixed to the front ends of the front fork and rear fork, respectively, and the body, the torso, and the cargo weight are supported by these two shafts, and the transmission mechanism is adapted to the road conditions such as inclination, So that it can be adjusted.

The reason why the bicycle can run without falling is because the person who shot the car balances unconsciously. Mechanically, it depends on the role of bicycle stability and career maintenance including the casting angle of the front wheel, the side force of the tire, and the weight effect of the front wheel.

Conventional bicycles are required to maintain equilibrium and run on the basis of the feedback of a person in order to run in a straight line state, so that the skill of a person is important and the possibility that a person having a low skill level is fallen relatively And the driving force is dependent on the force of turning the rear wheel, which causes a disadvantage that the driving force is lowered on an uphill road or an eye road.

In addition, since the pedal shaft is positioned substantially vertically downward from the seat, it is difficult to ride the bicycle in a comfortable sitting position on the seat.

In addition, there is a limitation in the transmission of the leg force, and the handle structure is configured to bend the waist, resulting in discomfort in posture and back pain caused by running for a long time.

And, it is inconvenient when storing, carrying and carrying bicycle. A foldable bicycle that can be folded or unfolded has been suggested, but the structure is complicated.

Korean Patent Application No. 10-2003-0051564 discloses a front-wheel drive motorcycle for driving a front wheel, and Korean Patent Laid-open Nos. 10-2007-0121932 and 10-2010-0035997 disclose a foldable bicycle .

Patent Literature 1. Korean Patent Application No. 10-2003-0051564 (Public Notification. Nov. 14, 2004) Patent Document 2: Korean Patent Laid-Open No. 10-2007-0121932 (Published on December 28, 2007) Patent Document 3: Korean Patent Laid-Open No. 10-2010-0035997 (Published Date: 2010.04.07)

SUMMARY OF THE INVENTION The present invention has been made to solve the conventional problems as described above, and it is an object of the present invention to provide a bicycle which is able to be folded and unfolded while driving the front wheel, The present invention is directed to providing a front-wheel-drive safety bicycle which can reduce the fall of the center of the front-wheel drive bicycle.

A front-wheel-drive safety bicycle according to an embodiment of the present invention includes a body including a fork supporting a front wheel, a steering shaft coupled with a fork, and a support frame supporting the rear wheel; A driving sprocket coupled to the rotational center shaft of the front wheel and rotated by pedaling; A crank arm having a pedal that rotates along the rotation center axis and turns the drive sprocket; A driven sprocket spaced apart from the drive sprocket and coupled to a steering shaft with a handle via a rotation shaft to interlock with the drive sprocket; A down frame coupled to the steering shaft such that one end thereof is rotatable and the other end is connected to the support frame by a first hinge axis and is folded and unfolded around a first hinge axis; A hinge piece connecting the down frame and the support frame; A second hinge shaft connecting the hinge piece and the support frame so as to be folded and unfolded; A seat mounted on an upper side of the support frame, and a seat stay for supporting the seat around a rear wheel.

The drive sprocket and the driven sprocket of the front-wheel-drive safety bicycle according to the embodiment of the present invention are formed of a chain wheel having a circumferential surface capable of hanging a chain, wherein the diameter of the drive sprocket is larger than that of the driven sprocket, The sprocket comprises a first chain wheel and a second chain wheel, the driven sprocket comprising a first chain wheel of the drive sprocket and a chain wheel corresponding to the second chain wheel, .

In the front-wheel-drive safety bicycle according to the embodiment of the present invention, a driving motor is installed along a rotation center axis of a rear wheel, and a battery pack for supplying power to the driving motor is incorporated in a lower portion of the seat. And a rear-mounted safety bicycle having an inclination that the backrest is tilted toward the rear wheel.

The lower frame of the front-wheel-drive safety bicycle according to the embodiment of the present invention is constituted by a coupling housing in which an upper portion is rotatably coupled with a steering shaft, And a front-wheel-drive safety bicycle in which a space for weight reduction is formed.

In addition, the front-wheel-drive safety bicycle according to the embodiment of the present invention is characterized in that the upper part of the seat is provided with a cover for shielding snow and rain or sunlight.

Further, the shielding means of the front-wheel-drive safety bicycle according to the embodiment of the present invention comprises: a winding drum installed at one end portion of the seat back; A shield which is wound or unwound around the winding drum; And a fixing unit for fixing one end of the visor to the vehicle body.

The front-wheel-drive safety bicycle according to the present invention is a chair-type safety bicycle which has a low center of gravity based on a sitting position on the seat, and can be safely traveled even when a person having a low skill level falls.

The front rolled safety bicycle according to the present invention can steer the pedal to roll the front wheel while sitting on the seat in a comfortable posture so that the steering can be steered without bending the waist to improve the inconvenience of the driving posture, It has the effect of reducing back pain and lowering fatigue.

The front-wheel-drive safety bicycle according to the present invention has a drive motor installed on the rear wheel drive shaft, and can simultaneously drive the front wheel and the rear wheel simultaneously or selectively drive the front and rear wheels as needed, thereby facilitating a slippery road such as an uphill road and an eye- .

1 is a schematic view of a front-wheel-drive safety bicycle according to an embodiment of the present invention;
2 is a sectional view taken along line A-A 'in Fig.
3 is a use reference diagram of a front-wheel-drive safety bicycle according to an embodiment of the present invention;

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 to 3. FIG.

1 is a schematic diagram of a front-wheel-drive safety bicycle according to an embodiment of the present invention. 1, a front wheel F is supported by a fork 100, a rear wheel R is supported by a support frame 110, and a seat 220 is supported by a seat stay 250. As shown in FIG. Since the fork 100, the support frame 110, and the seat stay 250 are classified into a vehicle body, the overall shape, length shape, thickness, and the like can be designed differently according to the frame geometry of each vehicle body. The illustrated vehicle body shape is a typical example, and the steering shaft 180 having the handle 190 mounted thereon is coupled to the fork 100 supporting the front wheel " F ".

FIG. 2 is a cross-sectional view illustrating a drive sprocket, a driven sprocket, and a crank arm portion of a front-wheel-drive safety bicycle according to an embodiment of the present invention.

1 and 2, a front wheel rolling safety bicycle according to an embodiment of the present invention includes a driving sprocket 130 coupled to a rotational center shaft 120 of a front wheel F to rotate by pedaling.

A crank arm 150 having a pedal 140 for rotating the driving sprocket 130 along the rotational center axis 120 of the front wheel F is formed.

The driven sprocket 170 is coupled to the driving sprocket 130 at a distance from the driving sprocket 130 and coupled to the steering shaft 180 with the handle 190 through the rotating shaft 160.

One end of the down frame is coupled to the steering shaft 180 and the other end of the down frame is connected to the support frame 110 by the first hinge shaft 210 to be folded about the first hinge shaft 210, 200).

A hinge piece 220 connecting the down frame 200 and the support frame 110; a second hinge shaft 230 connecting the hinge piece 220 and the support frame 110 so as to be foldable; A seat 240 seated on the upper side of the seat 110 and a seat stay 250 supporting the seat 240 about the rear wheel R. [

In addition, the driving sprocket 130 and the driven sprocket 170 of the front-wheel-drive safety bicycle according to the embodiment of the present invention may be constituted by a chain wheel having a tooth surface on which a circumferential surface can be engaged with a chain. Here, it is preferable that the diameter of the drive sprocket 130 is larger than that of the driven sprocket 170. The drive sprocket 130 may include a first chain wheel 131 and a second chain wheel 132. The driven sprocket 170 is provided with chain wheels 171 and 172 corresponding to the first chain wheel 131 and the second chain wheel 132 of the drive sprocket 130 to rotate the chains 173 and 174, .

The driven sprocket 180 may include a ratcheting wheel (not shown) that blocks reverse driving along the rotational axis 160. The driven sprocket 180 may be formed to have a diameter different from that of the driving sprocket 130 It is also possible to apply a transmission mechanism (not shown) combining a plurality of chain wheels.

The front wheel rolling safety bicycle according to the embodiment of the present invention is provided with a driving motor 270 along the rotation center axis 260 of the rear wheel R and a driving motor 270 The seat 240 is installed at the rear portion of the handle 190 and the back portion 290 is inclined toward the rear wheel R. [

The characteristics of the electric bicycle can be obtained when the drive motor 270 is installed along the rotation center shaft 260 of the rear wheel R. When the pedaling is not feasible or the fatigue is high or the uphill When driving on the same slippery road, the front wheel (F) and the rear wheel (R) can be driven at the same time, making it easier to go. The battery pack 280 that supplies power to the drive motor 270 at the lower portion of the seat 220 can directly support the seat 240, so that it is not necessary to provide a separate seat support.

In this case, when the seat 240 is seated on the seat 240, it is similar to sitting on a chair, and when the seat 240 is positioned on the rear side of the handle 190 and the backrest 290 is inclined toward the rear wheel, It is possible to pedal the pedal 140 in a comfortable posture by using a pair of legs.

The lower frame 200 of the front-wheel-drive safety bicycle according to the embodiment of the present invention comprises a coupling housing 201 whose upper portion is rotatably coupled to the steering shaft 180, And a fastening piece 202 coupled to the first hinge shaft 210. The space 203 for weight reduction may be provided.

The down frame 200 is coupled to the steering shaft 180 via the coupling housing 201 in a rotatable state without restraining the steering shaft 180. [ Then, the first hinge shaft 210 is easily folded or unfolded around the axis.

Further, in the front-wheel-drive safety bicycle according to the embodiment of the present invention, the upper part of the seat 240 may be provided with a cover for shielding snow and rain or sunlight.

FIG. 3 is a reference view showing an example of installing and operating a screening means on a front-wheel-drive safety bicycle according to an embodiment of the present invention.

It is preferable that the shielding means is constituted by a winder drum 300 provided at one end of the backrest 290 of the seat 240 and a shield 310 wound around or unwound around the winding drum 300.

A fixing part 320 for fixing one end of the visor 310 to the vehicle body may be provided to easily remove the visor 310 from the winding drum 300 when the snow, rain, sunshade or the like is necessary. On the other hand, the shielding means can be freely installed and operated without being limited thereto. A cloth 310, a flexible film resin, or the like can be used as the visor 310. The visor 310 can be wound around when not in use and taken out when needed.

In addition, the front-wheel-drive safety bicycle according to the embodiment of the present invention directly drives the front wheel F by driving power generated by the pedal swing. The rear wheel R can be driven by the power of the driving motor 270 as required because the rear wheel R can be driven by the power of the driving motor 270. The front wheel F and the rear wheel R R) can be driven simultaneously to go to the destination easily.

Further, the front-wheel-drive safety bicycle according to the embodiment of the present invention can shorten the entire length of the bicycle, and is easy to fold and unfold. The down frame 200 is coupled with the hinge piece 220 and the first hinge shaft 210 so that the down frame 200 can be freely moved and folded around the hinge pin. Also, the support frame 110 can be folded about the hinge piece 220 And is folded or unfolded around the hinge pin of the second hinge shaft 230.

The down frame 200 and the support frame 110 can be easily folded about the hinge pieces 220 and the first and second hinge shafts 210 and 230 to be convenient for transportation and storage .

The seat 240 is a chair-type structure and is safe because the body center of the seat 240 is low based on the sitting position on the seat 240, Because it can hold and adjust, it does not inconvenience in long time running, it reduces back pain and reduces fatigue.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, .

100: fork 110: support frame
120: rotation center shaft 130: drive sprocket
131: first chain wheel 132: second chain wheel
140: pedal 150: crank arm
160: rotating shaft 170: driven sprocket
180: steering shaft 190: handle
200: down frame 210: first hinge axis
220: hinge piece 230: second hinge shaft
240: Seat 250: Seat stay
260: rotation center shaft 270: drive motor
280: Battery pack 290: Backrest
300: winding drum 310:
320:

Claims (6)

A body including a fork supporting the front wheel and a steering shaft coupled to the fork, and a support frame supporting the rear wheel; A driving sprocket coupled to the rotational center shaft of the front wheel and rotated by pedaling; A crank arm having a pedal that rotates along the rotation center axis and turns the drive sprocket; A driven sprocket spaced apart from the drive sprocket and coupled to the steering shaft through a rotation shaft to interlock with the drive sprocket; A down frame coupled to the steering shaft such that one end thereof is rotatable and the other end is connected to the support frame by a first hinge axis and is folded and unfolded around a first hinge axis; A hinge piece connecting the down frame and the support frame; A second hinge shaft connecting the hinge piece and the support frame so as to be folded and unfolded; And a seat stay which is seated on an upper side of the support frame and supports the seat around a rear wheel. The method according to claim 1,
Wherein the drive sprocket and the driven sprocket have a diameter larger than that of the driven sprocket, the drive sprocket comprising a first chain wheel and a second chain wheel, Wherein the driven sprocket has a first chain wheel of the drive sprocket and a chain wheel corresponding to the second chain wheel, and is connected to the chain via the chain. The method according to claim 1,
A drive motor is installed along the rotation center axis of the rear wheel and a battery pack for supplying power to the drive motor is installed in the lower portion of the seat, and the seat is located at the rear portion of the handle, and the backrest is inclined toward the rear wheel Installed front-wheel-drive safety bike. The method according to claim 1,
The down frame includes a coupling housing in which an upper portion is rotatably engaged with a steering shaft and a lower portion is composed of a coupling piece coupled with the hinge piece and the first hinge shaft, Rolling safety bikes. The method according to claim 1,
The top of the seat is covered with a snow cover and sunshade. 6. The method of claim 5,
The shielding means may include: a winding drum installed at one end of the backrest of the seat; A shield which is wound or unwound around the winding drum; And a fixing unit for fixing one end of the visor to the vehicle body.

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