Bicycle stability principle uncovering experiment device

Abstract

The invention discloses a bicycle stability principle uncovering experiment device, and relates to the technical field of bicycle stability principles. The invention aims to vividly reveal the bicycle stability principle. The experiment table specifically comprises a first experiment table top and a second experiment table top, a side inclination hinge is arranged on the outer wall of the first experiment table top, and an additional rod is fixed to the outer wall of the top of the side inclination hinge. The experimental device can vividly demonstrate and prove that the gyroscopic effect is insufficient to keep the bicycle stable when the bicycle wheel rotates; the caster angle of the rotation shaft of the bicycle can generate a front wheel wake effect for stabilizing the bicycle; the front wheel of the heeling bicycle can automatically and correctly steer under the wake effect of the front wheel; centrifugal force generated by the bicycle which does redirection, such as rotary motion, can be used for centralizing the bicycle with side inclination; and the front wheel of the bicycle of which the front part of the rotation shaft of the front wheel is heavier can also automatically turn the front wheel of the bicycle with side inclination to the side inclination direction, so that the stability principle of the bicycle is vividly and vividly uncovered.

Description

Technical Field

[0001] The invention relates to the technical field of bicycle stability principle, in particular to a bicycle stability principle revealing experimental device. Background Art

[0002] Before 1970, people believed that once a cyclist felt the bicycle tilt, he would use both hands to turn the handlebars to turn the bicycle correctly, so that the centrifugal force of the bicycle could straighten the bicycle. In addition, people realized that the cyclist could change the direction of the bicycle and stabilize the bicycle by swinging his upper body left and right. Moreover, people also found that an empty bicycle with no rider could move forward stably when a person pushed it forward. In addition, it is known from experience that the cyclist does not need to pay attention to the tilt of the bicycle at any time and turn the handlebars. The above phenomena all suggest that bicycles have a magical ability to stabilize themselves.

[0003] It was not until 1970 that the British David Jones explained in an article in "Physics Today" that the reason why bicycles can be automatically stable is that once a bicycle tilts, the front wheel of the bicycle will automatically turn. This is because the steering axis of the front wheel of a bicycle has a caster angle (the steering axis is not perpendicular to the ground but has a significant caster angle), which makes the landing point of the front wheel significantly lag behind the intersection of the extension line of the rotation axis and the ground. Jones called it the "front wheel wake effect." Jones proved that it is the front wheel wake effect that gives the bicycle the ability to automatically turn to the side of the tilt after tilting, replacing the rider's control of the bicycle's self-stabilization ability.

[0004] However, 41 years after Jones' theory appeared, in 2011, a paper by JDGkooijman and other authors appeared in the American journal Science. The paper wrote that the experimental results of an experimental bicycle made by them without wheel gyro effect and front wheel wake effect showed that the unmanned experimental bicycle could move forward stably without falling after a person pushed it hard. This shows that the experimental bicycle has a stability reason that the world has not known so far. The paper can only speculate that it may be the characteristics of the front and rear mass distribution of the bicycle that give the bicycle this unknown stability reason. It is precisely because of the above question raised by Kooijman in 2011 that the world generally believes that the principle of bicycle stability that has puzzled the world for 200 years has not yet been finally solved.

[0005] After years of research, the patent applicant finally found a new reason why Koijman's experimental bicycle could not fall over. It turned out that the mass in front of the front wheel steering shaft of the bicycle was accidentally designed to be significantly larger than the mass behind the steering shaft. As a result, once the bicycle tilted, the extra mass in front of the steering shaft would generate a torque that automatically turned the front wheel to the side of the vehicle's tilt and caused the front wheel to turn.

[0006] For an ordinary bicycle, the front and rear masses of the front wheel steering axle are not much different, so there is no problem of imbalance of the front and rear masses of the front wheel steering axle. Only when there is a heavy object in the basket in front of the front wheel steering axle of the bicycle, the front wheel self-rotating axle will have a significant unequal mass front and rear, which can cause the sideways vehicle to have the effect of front wheel steering.

[0007] In order to illustrate the wake effect of the front wheel of a bicycle and the front and rear imbalance effects of the front wheel steering axis, the present invention designs an experimental device to reveal the principle of bicycle stability, and uses experiments to convincingly demonstrate the above two effects, thereby vividly revealing the principle of bicycle stability. Summary of the invention

[0008] The purpose of the present invention is to solve the shortcomings in the prior art and to propose an experimental device for revealing the principle of bicycle stability.

[0009] In order to achieve the above object, the present invention adopts the following technical solutions:

[0010] The bicycle stability principle revealing experimental device comprises a first experimental table and a second experimental table, wherein the outer wall of the first experimental table is provided with a roll hinge, an additional rod is fixed to the outer wall at the top of the roll hinge, a bicycle rear bracket is fixed to the outer wall at the top of the additional rod, one side outer wall of the bicycle rear bracket is connected to the bicycle front bracket through a steering shaft inclination adjustment mechanism, the inner wall of the bicycle front bracket is rotatably connected to the steering shaft, the inner wall of the steering shaft is rotatably connected to the front wheel, one side inner wall of the bicycle rear bracket is rotatably connected to the rear wheel, a steering shaft counterweight mechanism is provided on the outer wall at the top of the steering shaft, and a handlebar is fixed to the outer wall at the top of the steering shaft;

[0011] A set of reserved through grooves is opened on the outer wall of the top of the first experimental table, and a driving wheel is rotatably connected to the inner wall of one side of the reserved through groove. A driving motor is arranged on the inner wall of the reserved through groove, and the output shaft of the driving motor is connected to the outer wall of one side of the driving wheel through a coupling.

[0012] Preferably: a central axis is fixed to the bottom outer wall of the second experimental table, a base is fixed to the bottom outer wall of the central axis, a rotating plate is rotatably connected to the outer wall of the central axis, support frames are respectively fixed to both ends of the rotating plate, the inner wall of the support frame is rotatably connected to the rotating frame, the inner wall of the rotating frame is fixed to the support plate, and a miniature bicycle is fixed to the outer wall of the support plate.

[0013] Further: a toggle hand wheel is fixed on the outer wall of the bottom of the rotating plate.

[0014] Further preferred: the steering shaft counterweight mechanism includes a second fixed clamping plate, a second connecting plate and a counterweight block, the second fixed clamping plate is fixed to the outer wall of the handlebar by screw clamping, the second connecting plate is rotatably connected to one side outer wall of the second fixed clamping plate, and the counterweight block is fixed to one side outer wall of the second connecting plate.

[0015] As a preferred embodiment of the present invention: the steering shaft inclination angle adjustment mechanism includes a first fixed clamping plate, a first connecting plate and a fixed plate, the first fixed clamping plate is respectively fixed to the outer wall of one side of the rear bracket of the bicycle and the front bracket of the bicycle by screw clamping, the two ends of the fixed plate are respectively rotatably connected to the outer wall of one end of the first fixed clamping plate, the two first connecting plates are rotatably connected to each other, and one end of the first connecting plate is respectively rotatably connected to the outer wall of one side of the first fixed clamping plate.

[0016] As a further preferred embodiment of the present invention: an installation frame is provided on the inner wall of the reserved through groove, and supporting balls distributed in an array are fixed to the inner wall at the bottom of the installation frame.

[0017] As a further solution of the present invention: a base is fixed to the outer wall at the bottom of the central axis.

[0018] The beneficial effects of the present invention are:

[0019] 1. The front wheel and rear wheel of the modified bicycle of the device are supported on their own driving wheels driven by driving motors, so the front wheel and rear wheel of the bicycle can rotate at medium speed. The seat of the modified bicycle is first straightened by the hands of a person, a guide or an audience, and the two wheels are driven to rotate at medium speed. However, when the person leaves the modified bicycle and no longer straightens the bicycle, it can be seen that the bicycle will immediately tilt, thus proving through experiments that the commonly said view that the gyroscopic fixed axis effect when the bicycle wheel rotates can keep the bicycle stable is incorrect.

[0020] 2. The second experimental device of the bicycle stability principle-revealing experimental device is an experimental device with two miniature bicycles. In this device, one miniature bicycle can move forward in a clockwise rotation when driven by hand, while the other miniature bicycle can move forward in a counterclockwise rotation. When either miniature bicycle is stationary, its body obviously leans to the inside of the motion trajectory. However, when the miniature bicycle turns and moves forward, under the centrifugal force of the miniature bicycle's own mass, people can see that the miniature bicycle that is obviously tilted will automatically and quickly be straightened to a vertical state.

[0021] 3. First, hold the seat of the modified bicycle with your hands, but be careful not to hold the handlebars. Then use your hands to tilt the modified bicycle to the left. At this time, it can be seen that the front wheel of the modified bicycle will automatically turn to the left immediately under the front wheel wake effect, indicating that the centrifugal force of the car can straighten the body. Then, the steering axis inclination adjustment mechanism can adjust the steering axis caster angle to zero, that is, perpendicular to the ground, to eliminate the front wheel wake effect. At this time, do the car rollover experiment again, and you will find that the car without the front wheel steering axis caster angle and the front wheel wake effect has lost the automatic steering effect of the front wheel of the car after the rollover. However, for the bicycle that has lost the front wheel wake effect, if the mass is increased in front of the front wheel steering axis and the steering axis counterweight mechanism is rotated to the front of the steering axis, if the bicycle is tilted again at this time, the effect of the front wheel automatically rolling with the car will appear again.

[0022] 4. This experimental device can demonstrate and prove that: the gyroscopic effect when the bicycle wheel is rotating is not enough to keep the bicycle stable; the backward caster angle of the bicycle axis can produce a front wheel wake effect that stabilizes the vehicle; the front wheel of a tilted bicycle can automatically turn correctly due to the front wheel wake effect; the centrifugal force generated by a bicycle making a change of direction such as a rotation can straighten a tilted bicycle; a bicycle with a weight biased towards the front of the front wheel axis can also make the front wheel of a tilted bicycle automatically turn to the tilting side. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 This is a schematic diagram of the first part of the experimental device for revealing the bicycle stability principle proposed by the present invention;

[0024] Figure 2 A schematic diagram of the driving wheel structure of the bicycle stability principle revealing experimental device proposed by the present invention;

[0025] Figure 3 A schematic diagram of the tilted state of the steering axis of the bicycle stability principle revealing experimental device proposed by the present invention;

[0026] Figure 4 This is a schematic diagram of the structure of the steering shaft counterweight mechanism of the bicycle stability principle revealing experimental device proposed by the present invention;

[0027] Figure 5 This is a schematic diagram of the experimental equipment structure of the second part of the bicycle stability principle revealing experimental device proposed by the present invention;

[0028] Figure 6 A schematic diagram of the rotating forward state of the bicycle stability principle revealing experimental device proposed by the present invention;

[0029] Figure 7 This is a schematic diagram of the clockwise rotation and forward movement of the bicycle stability principle revealing experimental device proposed by the present invention.

[0030] In the figure: 1 a first experimental table, 2 a driving motor, 3 a rear wheel, 4 a bicycle rear bracket, 5 a first connecting plate, 6 a fixing plate, 7 a first fixing splint, 8 a counterweight, 9 a bicycle front bracket, 10 a steering shaft, 11 a front wheel, 12 a mounting frame, 13 a supporting ball, 14 a roll hinge, 15 an additional rod, 16 a reserved through slot, 17 a driving wheel, 18 a second connecting plate, 19 a second fixing splint, 20 a handlebar, 21 a base, 22 a toggle hand wheel, 23 a rotating plate, 24 a central axis, 25 a second experimental table, 26 a miniature bicycle, 28 a supporting frame, 29 a rotating frame, and 30 a supporting plate. DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described in detail below in conjunction with specific implementation methods.

[0032] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "set" should be understood in a broad sense, for example, they can be fixedly connected or set, or detachably connected or set, or integrally connected or set. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0035] Embodiment 1:

[0036] The experimental device for revealing the principle of bicycle stability, such as Figure 1-7As shown, it includes a first experimental table top 1 and a second experimental table top 25, the outer wall of the first experimental table top 1 is provided with a roll hinge 14, the top outer wall of the roll hinge 14 is fixed with an additional rod 15, the top outer wall of the additional rod 15 is fixed with a bicycle rear bracket 4, one side outer wall of the bicycle rear bracket 4 is connected to a bicycle front bracket 9 through a steering shaft inclination adjustment mechanism, the inner wall of the bicycle front bracket 9 is rotatably connected to a steering shaft 10, the inner wall of the steering shaft 10 is rotatably connected to a front wheel 11, one side inner wall of the bicycle rear bracket 4 is rotatably connected to a rear wheel 3, the top outer wall of the steering shaft 10 is provided with a steering shaft counterweight mechanism, and the top outer wall of the steering shaft 10 is fixed to a handlebar 20.

[0037] A set of reserved through grooves 16 is opened on the outer wall of the top of the first experimental table 1, and a driving wheel 17 is rotatably connected to the inner wall of one side of the reserved through groove 16. A driving motor 2 is arranged on the inner wall of the reserved through groove 16, and the output shaft of the driving motor 2 is connected to the outer wall of one side of the driving wheel 17 through a coupling;

[0038] The bicycle of the bicycle stability principle revealing experimental device has a battery-driven driving motor 2 under each of the front and rear wheels. The output shaft of the driving motor 2 drives the driving wheel 17 to drive the front and rear wheels of the bicycle to rotate after being decelerated. The bicycle stability principle revealing experimental device has a steering axis inclination adjustment mechanism that can adjust the castor angle of the front wheel steering axis. The mechanism can make the castor angle of the steering axis 10 be at two positions: zero degree, that is, the upper end of the steering axis 10 points to the zenith, and about 20 degrees.

[0039] The front wheel steering shaft of the bicycle stability principle revealing experimental device is provided with a movable steering shaft counterweight mechanism. The counterweight mechanism can be placed in a position where the mass in front of the front wheel steering shaft and the mass in the rear are balanced; the counterweight mechanism can also be moved forward to a position where the mass in front of the front wheel steering shaft is significantly greater than the mass in the rear of the steering shaft.

[0040] The bottom outer wall of the second experimental table 25 is fixed with a central shaft 24, the bottom outer wall of the central shaft 24 is fixed with a base 21, the outer wall of the central shaft 24 is rotatably connected with a rotating plate 23, both ends of the rotating plate 23 are respectively fixed with support frames 28, the inner wall of the support frame 28 is rotatably connected with a rotating frame 29, the inner wall of the rotating frame 29 is fixed with a support plate 30, and the outer wall of the support plate 30 is fixed with a miniature bicycle 26;

[0041] A hand wheel 22 is fixed to the outer wall of the bottom of the rotating plate 23 .

[0042] The second experimental part of the bicycle stability principle revealing experimental device is equipped with two miniature bicycles 26. One of the miniature bicycles 26 can rotate clockwise when manually pushed; the other miniature bicycle 26 can rotate counterclockwise when manually pushed; the bicycle stability principle is equipped with a set of shaft system devices that can make the two miniature bicycles 26 rotate, and the shaft system device is composed of a central shaft 24 and a rotating plate 23; each miniature bicycle 26 is provided with a rotating frame 29 that can make the body roll and rotate.

[0043] The experimental device for revealing the principle of bicycle stability is divided into two experimental parts. The device for the first experimental part is a modified bicycle, whose front wheel 11 and rear wheel 3 rotate under the drive of their respective drive motors 2 and drive wheels 17. Therefore, this experimental device can prove that the gyroscopic axis fixation of the rotating wheels is not sufficient to keep the bicycle stable.

[0044] This modified bicycle can also be used for experiments. When the bicycle tilts, the front wheel 11 of the bicycle will automatically turn to the side of the tilt. The reason is that the steering axis 10 of the front wheel 11 has a caster angle. This experimental device can prove that when the caster angle of the steering axis 10 of the front wheel 11 is adjusted to zero, the front wheel 11 of the bicycle will no longer turn with the tilt of the bicycle.

[0045] After the modified bicycle is adjusted to have a front mass of the steering shaft 10 significantly greater than a rear mass through the steering shaft counterweight mechanism, this experiment can prove that this reason can also cause the front wheel 11 to automatically steer to the side of the vehicle's roll as the vehicle rolls.

[0046] This device is designed for the second part of the experiment. It is an experimental device that uses human hands to push the miniature bicycle 26 to make a rotary forward motion, so as to demonstrate the effect that the centrifugal force generated when the bicycle makes a turning motion can straighten the bicycle that has tilted.

[0047] The bicycle stability principle revealing experimental device is composed of two parts: one is a modified bicycle; the other is a device that can realize the centrifugal force of a bicycle that is turning forward and can straighten the bicycle after it tilts.

[0048] The front wheel 11 and the rear wheel 3 of the modified bicycle of this device are respectively supported on the driving wheel 17 driven by the driving motor 2 respectively, so the front wheel 11 and the rear wheel 3 of the bicycle can rotate at medium speed.

[0049] The specific experimental method is: a person, an interpreter or an audience member first uses their hands to straighten the seat of the modified bicycle, and drives the two wheels to rotate at a medium speed. However, the person's hands leave the modified bicycle and no longer straighten the bicycle. At this time, it can be seen that the bicycle will immediately tilt. Therefore, the experiment proves that the commonly said view that the gyroscopic axis-fixing effect of the rotating bicycle wheel can keep the bicycle stable is incorrect.

[0050] At the same time, a second experimental device can be used to illustrate that the main reason for the stability of a bicycle is the centrifugal force generated when the bicycle turns forward, which can effectively straighten the bicycle after it has tilted.

[0051] The second experimental device of the bicycle stability principle revealing experimental device is an experimental device with two miniature bicycles 26. In the device, one miniature bicycle 26 can be driven by hand to move forward in a clockwise rotational manner. The other miniature bicycle 26 can move forward in a counterclockwise rotational manner. When any miniature bicycle 26 is stationary, its body obviously tilts to the inside of the motion track, but when the miniature bicycle 26 turns and moves forward, under the centrifugal force of the mass of the miniature bicycle 26 itself, people can see that the miniature bicycle 26 that is obviously tilted will automatically and quickly be straightened to a vertical state.

[0052] In fact, this centrifugal force can not only straighten the left-leaning car body, but also make the car over-right and tilt to the right. Similarly, the centrifugal force generated by the right-leaning car will make the car tilt to the left. In this way, it can be seen that the bicycle should be moving forward alternately from left to right. Although the amount of this forward bending is very small and not easy to be noticed.

[0053] To test the idea that the caster angle of a bicycle's axis of rotation can produce a front wheel wake effect that stabilizes the bicycle:

[0054] First, hold the seat of the modified bicycle with your hands, be careful not to hold the handlebars, and then use your hands to tilt the modified bicycle to the left. At this time, it can be seen that the front wheel 11 of the modified bicycle will automatically turn to the left immediately under the front wheel wake effect, indicating that the centrifugal force of the car can straighten the body.

[0055] Then, the steering shaft inclination adjustment mechanism can adjust the caster angle of the steering shaft 10 to zero, that is, a position perpendicular to the ground, to eliminate the front wheel wake effect. At this time, if the vehicle roll test is performed again, it will be found that the vehicle without the front wheel steering shaft caster angle and the front wheel wake effect loses the automatic steering effect of the front wheels of the vehicle after the roll.

[0056] But for this bicycle that has lost the front wheel wake effect, as adding mass at its front wheel steering shaft front part, the steering shaft counterweight mechanism is rotated to the steering shaft 10 front parts. At this moment, if the bicycle is tilted again, the front wheel will appear again automatically along with the effect of the car tilting.

[0057] From this we can see that this experimental device can demonstrate and prove that: the gyroscopic effect when a bicycle wheel is rotating is not enough to keep the bicycle stable; the castor angle of the bicycle's rotation axis can produce a front wheel wake effect that stabilizes the vehicle; the front wheel of a tilted bicycle can automatically turn correctly due to the front wheel wake effect; the centrifugal force generated by a bicycle making a change of direction such as a rotation can straighten a tilted bicycle; a bicycle with a weight biased towards the front of the front wheel rotation axis can also have the front wheel of a tilted bicycle automatically turn to the tilting side.

[0058] like Figure 1 , Figure 3 As shown, the steering shaft counterweight mechanism includes a second fixed clamping plate 19, a second connecting plate 18 and a counterweight 8. The second fixed clamping plate 19 is fixed to the outer wall of the handlebar 20 by means of screw clamps. The second connecting plate 18 is rotatably connected to one side outer wall of the second fixed clamping plate 19. The counterweight 8 is fixed to one side outer wall of the second connecting plate 18. A corresponding number of counterweights 8 can be passed through the top of the steering shaft 10 supported by the second connecting plate 18 through the second fixed clamping plate 19, and the position of the counterweight 8 on one side of the steering shaft 10 can be adjusted by rotating the second connecting plate 18.

[0059] like Figure 1-4 As shown, the steering shaft inclination angle adjustment mechanism includes a first fixed clamping plate 7, a first connecting plate 5 and a fixing plate 6, wherein the first fixed clamping plate 7 is fixed to the outer wall of one side of the bicycle rear bracket 4 and the front bracket 9 of the bicycle respectively by screw clamping, and the two ends of the fixing plate 6 are respectively rotatably connected to the outer wall of one end of the first fixed clamping plate 7, and the two first connecting plates 5 are rotatably connected to each other, and one end of the first connecting plate 5 is respectively rotatably connected to the outer wall of one side of the first fixed clamping plate 7; the angle of the steering shaft 10 can be adjusted by squeezing and stretching the two first fixed clamping plates 7, so that the steering shaft 10 can be conveniently adjusted to the two positions where the caster angle is zero degree and 20 degrees.

[0060] like Figure 2 As shown, the inner wall of the reserved through groove 16 is provided with a mounting frame 12, and the bottom inner wall of the mounting frame 12 is fixed with support balls 13 distributed in an array; the support balls 13 can support and guide the front wheel 11 when rotating, thereby improving the stability of the front wheel 11 when rotating.

[0061] like Figure 5-7 As shown, a base 21 is fixed to the outer wall of the bottom of the central axis 24; the base 21 can provide stable support for the second part of the experimental equipment.

[0062] When the present embodiment is used, the seat of the modified bicycle is first straightened by the person, the lecturer or the audience, and the two wheels are driven to rotate at a medium speed. However, the person's hand leaves the modified bicycle and no longer straightens the bicycle. At this time, it can be seen that the bicycle will immediately tilt. Therefore, the experiment proves that the commonly said view that the gyroscopic axis-fixing effect when the bicycle wheel rotates can keep the bicycle stable and not fall is incorrect.

[0063] At the same time, a second experimental device can be used to illustrate that the main reason for the stability of a bicycle is the centrifugal force generated when the bicycle turns forward, which can effectively straighten the bicycle after it has tilted.

[0064] The second experimental device of the bicycle stability principle revealing experimental device is an experimental device with two miniature bicycles 26. In the device, one miniature bicycle 26 can be driven by hand to move forward in a clockwise rotational manner. The other miniature bicycle 26 can move forward in a counterclockwise rotational manner. When any miniature bicycle 26 is stationary, its body obviously tilts to the inside of the motion track, but when the miniature bicycle 26 turns and moves forward, under the centrifugal force of the mass of the miniature bicycle 26 itself, people can see that the miniature bicycle 26 that is obviously tilted will automatically and quickly be straightened to a vertical state.

[0065] In fact, this centrifugal force can not only straighten the left-leaning car body, but also make the car over-right and tilt to the right. Similarly, the centrifugal force generated by the right-leaning car will make the car tilt to the left. In this way, it can be seen that the bicycle should be moving forward alternately from left to right. Although the amount of this forward bending is very small and not easy to be noticed.

[0066] To test the idea that the caster angle of a bicycle's axis of rotation can produce a front wheel wake effect that stabilizes the bicycle:

[0067] First, hold the seat of the modified bicycle with your hands, be careful not to hold the handlebars, and then use your hands to tilt the modified bicycle to the left. At this time, it can be seen that the front wheel 11 of the modified bicycle will automatically turn to the left immediately under the front wheel wake effect, indicating that the centrifugal force of the car can straighten the body.

[0068] Then, the steering shaft inclination adjustment mechanism can adjust the caster angle of the steering shaft 10 to zero, that is, a position perpendicular to the ground, to eliminate the front wheel wake effect. At this time, if the vehicle roll test is performed again, it will be found that the vehicle without the front wheel steering shaft caster angle and the front wheel wake effect loses the automatic steering effect of the front wheels of the vehicle after the roll.

[0069] But for this bicycle that has lost the front wheel wake effect, as adding mass at its front wheel steering shaft front part, the steering shaft counterweight mechanism is rotated to the steering shaft 10 front parts. At this moment, if the bicycle is tilted again, the front wheel will appear again automatically along with the effect of the car tilting.

[0070] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A bicycle stability principle revealing experimental device, comprising a first experimental table (1) and a second experimental table (25), characterized in that: The outer wall of the first experimental table (1) is provided with a roll hinge (14), an additional rod (15) is fixed to the top outer wall of the roll hinge (14), a bicycle rear bracket (4) is fixed to the top outer wall of the additional rod (15), one side outer wall of the bicycle rear bracket (4) is connected to the bicycle front bracket (9) through a steering shaft tilt angle adjustment mechanism, the inner wall of the bicycle front bracket (9) is rotatably connected to a steering shaft (10), the inner wall of the steering shaft (10) is rotatably connected to a front wheel (11), one side inner wall of the bicycle rear bracket (4) is rotatably connected to a rear wheel (3), a steering shaft counterweight mechanism is provided on the top outer wall of the steering shaft (10), and a handlebar (20) is fixed to the top outer wall of the steering shaft (10); A group of reserved through grooves (16) are formed on the outer wall of the top of the first experimental table (1), a driving wheel (17) is rotatably connected to the inner wall of one side of the reserved through groove (16), a driving motor (2) is arranged on the inner wall of the reserved through groove (16), and an output shaft of the driving motor (2) is connected to the outer wall of one side of the driving wheel (17) via a coupling.

2. The bicycle stability principle revealing experimental device according to claim 1, characterized in that: A central axis (24) is fixed to the outer wall at the bottom of the second experimental table (25); a base (21) is fixed to the outer wall at the bottom of the central axis (24); a rotating plate (23) is rotatably connected to the outer wall of the central axis (24); support frames (28) are respectively fixed at both ends of the rotating plate (23); a rotating frame (29) is rotatably connected to the inner wall of the support frame (28); a support plate (30) is fixed to the inner wall of the rotating frame (29); and a miniature bicycle (26) is fixed to the outer wall of the support plate (30).

3. The bicycle stability principle revealing experimental device according to claim 2, characterized in that: A turning hand wheel (22) is fixed to the outer wall of the bottom of the rotating plate (23).

4. The bicycle stability principle revealing experimental device according to claim 1, characterized in that: The steering shaft counterweight mechanism comprises a second fixed clamping plate (19), a second connecting plate (18) and a counterweight block (8); the second fixed clamping plate (19) is fixed to the outer wall of the handlebar (20) by means of screw clamping; the second connecting plate (18) is rotatably connected to one side outer wall of the second fixed clamping plate (19); and the counterweight block (8) is fixed to one side outer wall of the second connecting plate (18).

5. The bicycle stability principle revealing experimental device according to claim 1, characterized in that: The steering shaft inclination angle adjustment mechanism comprises a first fixing clamping plate (7), a first connecting plate (5) and a fixing plate (6); the first fixing clamping plate (7) is respectively fixed to the outer wall of one side of the bicycle rear bracket (4) and the front bracket (9) of the bicycle by screw clamping; the two ends of the fixing plate (6) are respectively rotatably connected to the outer wall of one end of the first fixing clamping plate (7); the two first connecting plates (5) are rotatably connected to each other; one end of the first connecting plate (5) is respectively rotatably connected to the outer wall of one side of the first fixing clamping plate (7).

6. The bicycle stability principle revealing experimental device according to claim 1, characterized in that: The inner wall of the reserved through groove (16) is provided with a mounting frame (12), and the inner wall at the bottom of the mounting frame (12) is fixed with supporting balls (13) distributed in an array.

7. The bicycle stability principle revealing experimental device according to claim 2, characterized in that: A base (21) is fixed to the outer wall of the bottom of the central shaft (24).

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