KR20000014376A - Rocking bicycle - Google Patents

Abstract

PURPOSE: The rocking bicycle is provided to enable rocking upward/downward as proceeding a bicycle because a bicycle wheel acts a cam operation to the ground by giving an eccentricity to the central axis of a front wheel or a rear wheel and a rotation axis. CONSTITUTION: The rocking bicycle is composed of:an inner cylinder(5) combined to be rotated to an axis(2) of a front fork(14); an outer cylinder(3) located around the inner cylinder(5) so the inner circumference of the cylinder as to be contacted with the outer circumference of the inner cylinder(5), which is a cylinder constituting the central part of the front wheel; a key groove(4) for combining the inner cylinder(5) and the outer cylinder(3) each other; the inner cylinder(5) and the outer cylinder(3) consisted of ball bearings; a large sprocket(8) combined to an axis(7) of the rear fork(15) to be eccentric with the central axis(7a) of the rear wheel; a chain(10) connected to the large sprocket(8).

Description

Shaking bicycle

The present invention relates to a driving method of a bicycle. More specifically, the present invention relates to a bicycle that allows the bicycle wheel to swing up and down as the bicycle proceeds by giving an eccentricity to the central axis and the rotating shaft of the front wheel or the rear wheel.

In general, the front wheel of the bicycle is fixed so that the central axis of the hub (spoke) connected to the rim (spoke) is rotated to the fork of the vehicle body to rotate in the idle (idle) state. The rear wheel has a structure similar to the front wheel, but has a structure in which a sprocket coaxially fixed to the rear wheel hub and a chainwheel that rotates together as the pedal rotates are connected through a chain in order to transmit a pedaling force. The basic structure is the same for a bicycle that can be multi-shifted. It is to fix several sprockets with different number of teeth on the rear wheel hub and to selectively connect these sprockets with a chain to change the reduction ratio.

Recently, bicycles, such as mountain bikes (MTB) and sports bicycles, are increasingly used for hobby, leisure, exercise, etc. rather than for transportation. In particular, mountain bikes are used a lot because they help to improve physical strength while riding a bike on a bumpy mountain road. However, only mountain bikes or general transport bikes have the same rigidity and cushioning properties of the body structure, and they have only the same effect on the flat land.

Accordingly, an object of the present invention is to provide a bicycle having a structure capable of swinging up and down as the bicycle proceeds by allowing the wheel to eccentrically rotate so that the actual center axis of the bicycle wheel and the fixed shaft that the wheel rotates are eccentric with each other.

1 is an overall appearance of a bicycle according to the present invention.

Figure 2a is a front wheel configuration of the bicycle according to the invention.

FIG. 2B is a cross-sectional view taken along the line B-B 'of FIG. 2A;

Figure 2c is a block diagram showing another embodiment of the front wheel of the bicycle according to the present invention.

Figure 3a is a cross-sectional view taken along the line AA 'of Figure 1 as a rear wheel configuration during normal operation.

Figure 3b is a front view of the rear wheel configuration when the normal operation.

3C is a cross-sectional view of a configuration in which the rear wheel shaft forms a crank shaft shape when the swinging operation is performed.

Fig. 3D is a sectional view of the configuration in which the rear wheel shaft forms a crank shaft shape when the swinging operation is performed.

Figure 4a is a cross-sectional view showing another embodiment of the rear wheel of the bicycle according to the present invention.

Figure 4b is an exploded perspective view showing another embodiment of the rear wheel of the bicycle according to the invention.

4C is a detailed structural diagram of the large sprocket 109 and the shaft 107 of FIGS. 4A and 4B.

4D is a detailed structural diagram of the combination of the hub 101 and the small sprocket 108 of FIGS. 4A and 4B.

Figure 4e is a rear wheel configuration when in normal operation.

Figure 4f is a rear wheel configuration when running rocking.

<Description of Major Symbols in Drawing>

Center of the front wheel (C) Front wheel (1)

Shaft of the front fork (shaft of the inner cylinder) (2)

Outer cylinder (3) Ball bearings (3a, 5a)

Keyway (4) Internal Cylinder (5)

Rear Wheel (6) Rear Fork Shaft (7)

Rear wheel center (7a) Large sprockets (8)

Small sprocket (9) Shaft of small sprocket (9a)

Chain Wheel (10) Chain Wheel (11)

Key (12a) Chain Puller (13)

Front Fork (14) Rear Fork (15)

Rear wheel hub (16) Chain change guide (18)

Rear Wheel Hub (101) Detent Pusher (102)

Detent (103) Detent First Stage (103a)

Detent Second Stage 103b Detent Groove 103c

Detent Locking Pin (104) Spring (105)

Openings (106) Shafts (107)

Small Sprockets (108) Large Sprockets (109)

Chain (110)

With reference to the drawings will be described the configuration and operation of the bicycle according to the present invention. 1 shows an overall schematic view of a bicycle according to the present invention. Since the overall shape is the same as a general bicycle, the description thereof is omitted and only the front and rear wheel structures are described.

First of all, the structure of the front wheel 1 is fixed to the shaft 2 of the front fork 14 so that the inner cylinder 5 is rotated, and the inner cylinder 5 is inscribed eccentrically to the outer cylinder 3. The outer cylinder 3 is formed integrally with the front wheel (1). The inner cylinder 5 and the outer cylinder 3 are rotated separately, but can be fixed by inserting a key into the key groove 4.

Next, look at the structure of the rear wheel (6). The small sprocket 9 and the large sprocket 8 are fixed to the shaft 7 of the rear fork 15 to rotate. The coupling structure of the small sprocket 9 and the large sprocket 8 will be described later with reference to Figs. 3a, b, c, d. The chain 10 connecting the chain wheel 11 and the small sprocket 9 or the large sprocket 8 can be converted into the chain change guide 18 as in a general multi-speed bicycle. Reference numeral 13 denotes a chain roller for maintaining a constant tension of the chain as the length of the chain varies. This will also be described in detail with reference to FIGS. 3A, b, c and d.

Now let's talk about each in detail. Figures 2a and 2b is a view showing in detail the structure of the front wheel, Figure 2c shows another embodiment. 2A and FIG. 2B, which is a cross-sectional view thereof, an inner cylinder 5 is rotatably coupled to the shaft 2 of the front fork 14, and an outer cylinder having a diameter larger than that of the inner cylinder outside the inner cylinder 5. (3) is located. The outer cylinder 3 is integrated concentrically with the front wheel 1, each cylinder is composed of ball bearings (3a, 5a) to reduce the rotational friction. In addition, although the inner cylinder 5 and the outer cylinder 3 are separated from each other, there is a key groove 4 as a locking device for coupling and fixing them.

The operation of the front wheel configured in this way will be described. Normally, that is, when driving like a normal bicycle, the inner cylinder 5 and the outer cylinder 3 are not coupled to each other. In this case, due to the weight of the bicycle and the driver, the inner cylinder (5) and the outer cylinder (3) are in contact with the lower part as shown in the figure. Because the inner cylinder 5 and the outer cylinder 3 rotate separately and push behind, the wheel center C of the front wheel 1 becomes horizontal with respect to the ground while the front wheel 1 rotates and the bicycle advances.

In order to cause the front wheel 1 to swing up and down, the inner cylinder 5 and the outer cylinder 3 are fixed by inserting a key into the key groove 4. Since the inner cylinder (5) and the outer cylinder (3) are now integrally rotated together, the wheel center (C) is eccentrically by the shaft (2) and d of the fork, and the wheel center (C) moves up and down. The bicycle moves forward. At this time, because the front wheel acts as a cam on the ground, the bicycle will swing forward and downward.

Fig. 2C shows another embodiment of the front wheel structure shown in Fig. 2A. Instead of bearings, gear teeth are formed to implement the inner gear 115 and the outer gear 113. The principle is the same as in the case of FIG. 2A.

Now, let me explain the structure and action of the rear wheels. The coupling structure of the sprocket is shown in detail in Figures 3a-3d. The small sprocket 9 is coaxially coupled with the center 7a of the rear wheel 6 and the large sprocket 8 is centrally coupled to the shaft 7 of the rear fork 15. The shaft 9a of the small sprocket 9 is coupled to rotate on the large sprocket 8 so as to be eccentric with the center of the large sprocket 8, that is, the shaft 7 of the rear fork 15. On the opposite side where the small sprocket 9 and the large sprocket 8 are located, the central axis 7a of the wheel and the shaft 7 of the rear fork 15 have a crankshaft shape. In other words, the rear fork shaft 7 and the wheel shaft 7a form a crank shaft.

The hub 16 of the rear wheel, the small sprocket 9 and the large sprocket 8 are provided with a key groove 12 (FIG. 3B), so that the key 12a can be inserted into the key groove 12 to be fixed to each other (FIG. 3c, FIG. 3d). 3d shows a chain pulling device 13 for keeping the tension of the chain 10 constant. The pulling force in the direction of the arrow acts on the chain pulling device 13 so that the tension of the chain 10 can be kept constant at all times. This will be described in detail when explaining the operation of the rear wheel.

The operation of the rear wheel according to the present invention will be described. 3A and 3B are views showing a case where the vehicle is run without swinging like a general bicycle, and a cross section and a front view showing a state in which the chain 10 is fastened to the small sprocket 9 of the rear wheel 6 and the key groove 12 is not inserted. . 3A, when the driver presses the pedal force to the small sprocket 9 by the chain 10, the small sprocket 9 rotates and the rear wheel 6 connected thereto moves the wheel center 7a along the axis. To rotate. Therefore, at this time, the large sprocket 8 does not work at all.

The case of swinging the rear wheel 6 will be described with reference to Figs. 3C and 3D. At this time, the chain 10 is hooked to the large sprocket 8 and the key 12a is inserted into the key groove 12 to fix the rear wheel hub 16, the small sprocket 9 and the large sprocket 8 to each other. When the driver presses the pedal force to the large sprocket 8 by the chain 10, the large sprocket 8 rotates. At this time, since the small sprocket 9 and the rear wheel hub 16 are fixed to each other, The rotating shaft form of the crankshaft form the rear wheel (6) is rotated with the axis (7) of the rear fork as the rotation axis while the center (7a) is eccentric with the shaft (7) of the rear fork (15) . That is, the center axis 7a of the wheel cranks with respect to the axis 7 of the rear fork. Therefore, since the rear wheel rotates eccentrically not only up and down, but also back and forth, the chain 10 needs to be tensioned and then repeated to make the chain tension constant. Therefore, as described above, the chain pulling device 13 is installed. The chain pulling device 13 simply acts as an idler because the tension is always constant when the chain is hooked to the small sprocket 9, but as described above, the chain pull device 13 is moved upwards when the chain is hooked to the large sprocket 8. The tension of the chain always keeps the tension of the chain constant.

The chain 10 is connected to the large sprocket 8 so that the rear wheel rotates in an eccentric manner so that the rear wheel acts as a cam against the ground, and the bicycle moves forward while the rear part swings up and down. In the above embodiment, the rocking operation is performed in the case of the large sprocket (8), the structure is designed to allow the normal operation in the case of the small sprocket (9), but this is a technical matter that can be selected by those skilled in the art. However, when the large sprocket 8 is as described above, the rocking operation is performed normally, and when the small sprocket 9 is operated, the large sprocket 8 has a low speed and a large torque and a small sprocket 9. In this case, the speed is high and the torque is small, which is more preferable for the purpose of swinging the bicycle.

Figures 4a, b, c, d, e and f show different embodiments than those shown in Figures 3a-3d above. 4A and 4B, the small sprocket 108 is coupled to the cylindrical rear wheel hub 101, and the small sprocket 108 is eccentrically coupled to the large sprocket 109. As shown in FIG. The rear fork 15 is coupled through a bearing to both shafts of the large sprocket 109. The chain 110 may be selectively connected to the large sprocket 109 and the small sprocket 108.

The structure of the large sprocket 109 will be described in detail with reference to Fig. 4C. The large sprocket 109 is coupled to the long rotating shaft 107, the L-shaped pawl 103 is coupled to the inside of the rotating shaft 107 to be rotated by the detent fixing pin 104. The second end 103b of the detent 103 is in contact with the spring 105 so as to be pushed by the spring 105 and the opposite side which is in contact with the spring is in contact with the detent seal 102. As shown in FIG. 4C, when the detent seal 102 is pushed, the second end 103b of the detent is pushed and the first end 103a of the detent is opened with the fixing pin 104 as the axis. Pops out through. When the detent seal 102 is released again, the second end 103b of the detent is pushed back by the spring 105 to its original position.

The structure of the rear wheel hub 101 and the small sprocket 108 will be described with reference to FIG. 4D. The rear wheel hub is an assembly in which the hub 101 and the small sprocket 108 are integrally coupled. The rear spherical hub has a shaft hole 111 formed at the rear wheel center C and an eccentric position Ca. Rotation shaft 107 is inserted. A stop groove 103c is dug in the inner wall of the shaft hole 111. The stop groove 103c is dug to catch the first end 103a of the detent inside the rotary shaft 107 while the hub is rotating. One side of the stop groove 103c is slanted gently and the other side is dug at a right angle so as to be caught.

4E and 4F, the operation of the present embodiment will now be described.

When the bicycle is to be driven normally without swinging, the chain 110 is fastened to the small sprocket 108 and the detent 103 of the rotating shaft 107 is put in place. That is, the large sprocket 109 and the rear wheel hub 101 can be rotated separately. Then, since the rear wheel hub 101 and the large sprocket rotation shaft 107 rotates separately, the rear wheel is advanced while the center thereof becomes horizontal with respect to the ground as in the case of the front wheel.

To allow the bicycle to be driven while swinging, the chain 110 is fastened to the large sprocket 109 and the detent 103 of the rotary shaft 107 is pushed by the pusher 102 to stop the first end 103a of the detent 103C. ). The sealer 102 can be operated while sitting in the saddle by using a cable wire used for bicycle brake or gear conversion, which is a technical matter that can be easily performed by those skilled in the art. Since the detent groove 103c is formed to be inclined on one side as described above, the detent groove 103c and the detent first end 103a can be engaged even when the detent seal 102 is pushed at any time during the bicycle. have.

Since the large sprocket 109 and the hub 101 are fixed by the detent 103, the rear wheels rotate together with the rotation of the large sprocket 109, but the rotary shaft of the large sprocket 109, that is, the rear fork 15 The rear wheel is eccentric and rotates because it is eccentric with the fixed shaft (Ca) of the rear wheel and the central axis (C) of the rear wheel. Therefore, the rear wheels cam to the ground, and the bicycle moves forward while swinging up and down. In this case, as described above, since the rear wheel is eccentrically moved back and forth, the tension of the chain 110 is tightened and loosened. Therefore, it is necessary to keep the tension of the chain constant with the chain pulling device 13.

As mentioned above, although the Example which concerns on this invention was described, this invention is not limited only to this Example, A various deformation | transformation combination is possible. You can make the front and rear wheels rock separately, or you can choose to rock the front and rear wheels at the same time.

As described above, according to the present invention, because it is a simple structure, you can enjoy the rocking of the mountain bike like riding a mountain bike on the flat, so you can feel the mountain bike anytime, anywhere, and double the amount of exercise, thereby helping to increase physical strength Can give a healthy recreation.

Claims (10)

A bicycle that swings up and down as the bicycle proceeds by allowing the center axis of the bicycle wheel and the rotating shaft of the wheel to be eccentric with each other. An inner cylinder 5 coupled to rotate on the shaft 2 of the front fork 14, An outer cylinder (3) positioned around the inner cylinder (5) such that the inner circumferential surface of the cylinder is in contact with the outer circumferential surface of the inner cylinder (5), forming a central portion of the front wheel; A swinging bicycle, characterized in that it comprises a keyway (4) for coupling the inner cylinder (5) and the outer cylinder (3) to each other. The swinging bicycle according to claim 2, wherein the inner cylinder (5) and the outer cylinder (3) are ball bearings. The swinging bicycle according to claim 2, wherein the inner cylinder (5) and the outer cylinder (3) are gears. A small sprocket 9 coupled to the central axis 7a of the rear wheel 6, A large sprocket 8 coupled to the central axis 7a of the rear wheel and the shaft 7 of the rear fork 15 which is eccentric, A chain 10 selectively connected to a small sprocket 9 or a large sprocket 8, Chain pull device 13 to keep the tension of the chain constant, A swinging bicycle, characterized in that it comprises a hub (16) and a small sprocket (9) and a large sprocket (8) of the rear wheel (6). Rear wheel 101, the first sprocket 108 is coaxially coupled and the shaft hole 111 is formed in the eccentric position, A second sprocket 109 into which a central shaft 107 is inserted into the shaft hole 111 of the rear wheel hub 101, Fixing means for fixing the rear wheel hub 101 and the second sprocket 109, A swinging bike, characterized in that it comprises a chain (110) selectively connected to the first sprocket (108) and the second sprocket (109). The method of claim 6, wherein the fixing means L-shaped detent 103 coupled to the inside of the rotating shaft 107 of the second sprocket 109 so as to be rotatable by a fixing pin 104, a spring 105 connected to the first end 103a of the detent. A detent seal 102 that pushes the second end 103b of the detent, Stop groove 103c formed in the inner wall of the shaft hole 111 of the rear wheel hub 101 to engage with the first end 103a of the detent to fix the second sprocket 109 and the rear wheel hub 101. Oscillating bike, characterized in that it comprises a. 8. A rocking bike according to claim 7, wherein the diameter of the first sprocket (108) is smaller than the diameter of the second sprocket (109). A rocking bicycle, comprising both the claims 2 and 5. A rocking bicycle, comprising both claims 2 and 7.