JPWO2015040748A1 - Two-wheeled toy and combination set of two-wheeled toy and traveling platform - Google Patents

Abstract

The present invention proposes a two-wheeled traveling toy that operates differently using wheels that rotate about a vertical rotation axis. The two-wheeled toy includes a vehicle body 2 provided with a power mechanism 5, a pair of vertical rotation shafts 16 that are linked to the power mechanism 5 and project downward from both front and rear sides of the vehicle body 2, and each vertical rotation shaft. 16 is provided with a pair of wheels 20 formed as a bottom rotating body having the vertical rotation axis as a rotationally symmetric axis and a substantially flat bottom surface, and a bottom surface 22 and a side surface 24 of the wheel 20 An annular ground plane 26 was formed between them. Further, the annular grounding surface 26 has a curved shape that protrudes outward and downward continuously with the contours of the bottom surface 22 and the side surface 24 when viewed in a cross section passing through the axis of the vertical rotation shaft 16 of the wheel 20.

Description

  The present invention relates to a two-wheel traveling toy and a combination set of a two-wheel traveling toy and a traveling platform.

  A conventional two-wheeled toy has front wheels and rear wheels that rotate around a horizontal rotation axis in the same manner as an actual motorcycle, and has a steering mechanism that controls the direction of the front wheels so that they do not fall sideways. . In order to operate the steering mechanism, for example, a means capable of being wirelessly operated by a human being is employed (Patent Document 1), or an automatic steering mechanism using a gyro effect is employed (Patent Document 2). .

JP 2004-167116 A JP 2003-190654 A Utility model registration No. 3170339

  The two-wheeled toy of Patent Document 1 has a problem that it is expensive because it adopts a radio control system. Further, the two-wheel traveling toy of Patent Document 2 is configured to return to the opposite direction by the inertial force in the standing direction using the gyro effect when the vehicle body is tilted to the left or right side. Difficult to design for. Also, in the toy field, new products are preferred, and there are always demands for innovative ideas and unique movements in achieving the two-wheeled driving task.

  In order to meet these demands, the applicant has invented a two-wheeled toy that employs wheels that rotate around a vertical axis of rotation. When a similar technique is searched for within the scope investigated by the applicant, there is a toy in which two frames are connected to each other (see FIG. 2 of Patent Document 3). However, the top is in contact with the ground in the vicinity of the tip on the rotating shaft and rotates by the gyro effect, and is different from the toy of the present application in the grounding location, usage, and action.

A first object of the present invention is to propose a two-wheeled toy that performs a different operation using a deformed wheel that rotates around a vertical rotation axis.
The second object of the present invention is to propose a two-wheeled toy and a combination set of traveling platforms suitable for this.

The first means of the present invention is a two-wheeled toy,
A vehicle body with a power mechanism,
A pair of vertical rotating shafts that are linked to the power mechanism and project downward from both front and rear sides of the vehicle body;
Around a lower part of each vertical rotation axis, a pair of wheels formed as a bottom rotary body having the vertical rotation axis as a rotationally symmetric axis and a substantially flat bottom surface;
Comprising
An annular ground contact surface is formed between the bottom surface and the side surface of the wheel.

In this means, the two-wheel traveling toy 1 has a pair of wheels 20 that can rotate around the vertical rotation shaft 16 as shown in FIG. Each wheel 20 is a bottom rotating body having a substantially flat bottom surface. The wheel has an annular ground surface 26 suitable for traveling on an inclined surface.

The second means includes the first means, and the annular grounding surface has a curved shape that is convex outward and continuous with the contours of the bottom surface and the side surface as seen in a cross section passing through the rotational axis of the wheel.

  In this means, as shown mainly in FIG. 15, the annular grounding surface 26 is bent outward.

The third means includes the first means or the second means, and the height of the entire center of gravity is larger than the radius from the axis of the vertical rotation axis to the inner peripheral end of the annular ground plane. .

In this means, as shown in FIG. 12, the height of the center of gravity G of the two-wheel traveling toy 1, is larger than the distance from the axis of the wheel 20 to the inner peripheral edge e _I of the annular contact surface 26. This prevents the two-wheeled toy 1 from falling down the slope. This will be described later.

The fourth means includes any one of the first means to the third means, and projects from the side surface of the vehicle body at least one auxiliary protrusion for regulating the inclination of the vehicle body to the side. When the two-wheeled toy is placed on a horizontal plane with the vehicle body 2 tilted, the auxiliary bumps are positioned so that the center of gravity of the vehicle body is between the tip of the auxiliary protruding pieces and the wheels when viewed from above. The length of the piece was designed.

  This means proposes an auxiliary protrusion 18 that protrudes laterally from the side surface of the vehicle body 2. The auxiliary protrusion 18 regulates the inclination of the vehicle body 2 by sliding contact with the traveling surface. By the action of the auxiliary protruding piece 18, when the two-wheeled toy is placed on a horizontal plane with the vehicle body 2 tilted as shown in FIG. 8 or FIG. 18, the center of gravity G of the vehicle body 2 is viewed from above. , Between the tip 18 a of the auxiliary protrusion 18 and the wheel 20. The auxiliary protruding piece 18 can be detachably formed on the side surface of the vehicle body 2.

In the combination set of the two-wheel traveling toy 1 and the traveling platform 30 described in the fourth means,
The above-mentioned traveling platform forms a shallow circular recess for the two-wheel traveling toy to travel in the circumferential direction on the top surface of the top wall, and this circular recess is substantially arc-shaped when viewed in the longitudinal sectional direction passing through its center line. The curvature of the arc is designed so that the side edge of the lower surface of the vehicle body does not contact the circular recess when the wheel and the tip of the auxiliary projection piece are in contact with the circular recess.

  In this means, a combination set of the above-described two-wheel traveling toy 1 and the traveling platform 30 shown in FIG. 9 for causing the two-wheel traveling toy 1 to travel is proposed. The traveling platform 30 has a circular recess 32. The curvature of the circular recess is relatively determined according to the length of the auxiliary protrusion 18. That is, when the wheel 20 and the tip 18a of the auxiliary protrusion 18 are in contact with the circular recess 32, the side edge Ms of the lower surface of the vehicle body is designed not to contact the circular recess 32 (FIG. 14A). (See (a-2)). Thereby, the inclination of the vehicle body 2 can be reduced, and the frictional resistance between the vehicle body 2 and the traveling surface can be reduced.

According to the invention relating to the first means, since the annular ground contact surface 26 is formed between the bottom surface and the side surface of the wheel 20 which is the bottom rotating body, a unique toy traveling on an inclined surface can be provided.
According to the invention relating to the second means, since the annular grounding surface 26 has a curved shape protruding outward and downward, the frictional force of the wheel against the inclined surface can be sufficiently ensured.
According to the invention according to the third means, the overall height of the center of gravity G, because the larger than the radius r from the axis of the vertical shaft 16 to the inner peripheral edge e _I of the annular contact surface 26, the inclination When running in a direction across the surface, it is possible to prevent the slope from falling down.
According to the invention relating to the fourth means, the inclination of the vehicle body 2 is controlled by the auxiliary projection piece 18 to enable stable running.
According to the fifth aspect of the invention, since the two-wheel traveling toy 1 travels in the circular recess 32, it is possible to provide a new way of playing that has not existed before. Moreover, since the side edge Ms of the lower surface of the vehicle body 2 does not contact the circular recess 32 when the two-wheel traveling toy 1 is placed in the circular recess 32, the frictional resistance can be reduced.

1 is a side view of a two-wheeled traveling toy according to a first embodiment of the present invention. It is a bottom view of the two-wheeled travel toy of FIG. It is a front view of the two-wheel traveling toy of FIG. It is a top view of the two-wheel traveling toy of FIG. It is the longitudinal cross-sectional view seen from the side of the two-wheel traveling toy of FIG. It is a disassembled perspective view of the two-wheel traveling toy of FIG. It is a figure which decomposes | disassembles and shows the two-wheel traveling toy of FIG. 1 from the downward direction. It is a figure which shows the stationary state which the two-wheeled travel toy of FIG. 1 inclined in front. It is a top view of the traveling stand used for the two-wheel traveling toy of FIG. It is a longitudinal cross-sectional view of the traveling stand of FIG. It is explanatory drawing which saw through the two-wheel traveling toy which drive | works the said traveling stand from the bottom. It is explanatory drawing which looked at the two-wheel traveling toy which drive | works the said traveling stand from the front. It is explanatory drawing which saw through the two-wheel traveling toy which rotates on the said traveling stand from the bottom. It is a figure for demonstrating the effect | action of the auxiliary | assistant protrusion attached to the two-wheeled traveling toy of FIG. 1, The figure (A) is a mode that the two-wheeled traveling toy with an auxiliary | assistant protruding piece inclines within the inclined saddle curved surface. (B) of FIG. 2 illustrates a state in which a two-wheeled toy with an auxiliary protruding piece is inclined in an inclined curved surface. It is a side view of the two-wheeled travel toy concerning a 2nd embodiment of the present invention. FIG. 16 is a bottom view of the two-wheel traveling toy of FIG. 15. FIG. 16 is a front view of the two-wheel traveling toy of FIG. 15. It is a figure which shows the stationary state which the 2-wheel traveling toy of FIG. 15 inclined in front. It is a side view of the two-wheeled travel toy concerning a 3rd embodiment of the present invention. FIG. 20 is a front view of a driving jig for traveling the two-wheeled traveling toy of FIG. 19.

  1 to 14 disclose a combination set of a two-wheeled traveling toy and a traveling platform according to the first embodiment of the present invention.

  The two-wheel traveling toy 1 includes a vehicle body 2, a pair of vertical rotation shafts 16, and a pair of wheels 20.

  The vehicle body 2 is preferably formed long in one direction. The two-wheel traveling toy 1 can travel in the longitudinal direction of the vehicle body. The vehicle body 2 is preferably formed as a hollow case body. The vehicle body 2 includes a power mechanism 5 and power transmission means 6 that transmits power from the power mechanism 5 to the vertical rotation shaft 16. In this embodiment, the power mechanism 5 is an electric motor, and the vehicle body 2 includes a battery 8 for driving the electric motor. However, this structure can be changed as appropriate. The illustrated power transmission means 6 is formed of a gear, but this structure can also be changed.

As a preferred embodiment, the vehicle body 2 includes a lower half 2a and an upper half 2b that are detachably attached to each other. Insertion holes 10 for the vertical rotation shaft 16 are formed on both front and rear sides of the lower half 2a, and bearings 12 are formed on the upper half of the lower half 2a above the insertion holes 10. The illustrated vehicle body 2 has an opening on the lower surface, and a lid 4 is detachably fitted in the opening. In the illustrated example, a part of the hole edge of the opening is cut out, and the connecting protrusion 4a protrudes outward from the lid 4 through the notch. This connection protrusion 4a is connected to the lower part of the vehicle body 2 by means such as a screw.

  In the present embodiment, the vehicle body 2 has a pair of auxiliary protrusions 18 protruding from the side surface of the vehicle body 2. The auxiliary protrusion 18 has a function of regulating the inclination of the vehicle body 2 in contact with the traveling surface during traveling of the two-wheel traveling toy. That is, when the two-wheeled toy is tilted around the end of the wheel 20 (contact point Pc) on the flat surface shown in FIG. 8 or at least the concave saddle curved surface shown in FIG. The front end 18a of the 18 is in contact with the flat surface or the curved surface, so that the vehicle body 2 is prevented from further tilting and the vehicle body 2 is prevented from directly contacting the surface. This is because the traveling speed decreases when the vehicle body directly touches the surface on which the two-wheel traveling toy should travel. This will be described later.

  If at least one auxiliary protruding piece protrudes from one side surface of the vehicle body 2, the above function can be achieved. However, in the illustrated example, a pair of auxiliary protrusions 18 are provided on both sides of the vehicle body 2 in consideration of the balance of the vehicle body 2.

  Each of the auxiliary protrusions 18 preferably protrudes from the lower part of the side surface of the vehicle body 2. As a preferred embodiment, the illustrated auxiliary protruding piece 18 protrudes in the horizontal direction, but may protrude obliquely downward. In the illustrated example, the auxiliary protrusion 18 is formed in a fin shape, but the shape can be changed as appropriate.

  The length L of the auxiliary protrusion 18 is such that when the two-wheeled toy 1 is placed on a horizontal plane as shown in FIG. It is determined so as to exist between the point Pc and the tip 18 a of the auxiliary protrusion 18.

  As a preferred embodiment, the vehicle body 2 has, as shown in FIG. 3, a bulging portion 3 that bulges laterally at an intermediate portion in the longitudinal direction, and the lower surface of the bulging portion 3 is a flat surface (see FIG. As the mounting portion 17 that is a horizontal flat surface in the illustrated example, an auxiliary protrusion 18 can be detachably formed on the mounting portion 17. Each of the pair of auxiliary protrusions 18 can be formed as a single plate as shown in FIG. Each auxiliary protruding piece 18 has a distal end 18a and a proximal end 18b, and has a certain protruding length to the side. This length will be described later. In the illustrated example, one of the two auxiliary protrusions 18 has a notch 18c that fits with the connecting protrusion 4a.

  The pair of vertical rotation shafts 16 are locked at the upper ends by the bearings 12 and project downward from the vehicle body 2 through the insertion holes 10. The vertical rotation shafts 16 and the power transmission means 6 are linked so that the pair of vertical rotation shafts 16 can rotate in the same direction. In the present specification, the term “vertical rotating shaft” is used to distinguish from a horizontal rotating shaft used in a tire such as a general motorcycle, and does not need to be strictly vertical.

  The pair of wheels 20 are attached to the lower end portions of the vertical rotating shafts 16. In the present embodiment, the wheel 20 is connected to the lower end portion of the vertical rotating shaft 16. As shown in FIG. 3, the illustrated wheel 20 has a shaft fitting tube portion 28 standing upright from the center of the bottom wall, and the vertical rotating shaft 16 is fixed inside the shaft fitting tube portion 28. However, this structure can be changed as appropriate, and the vertical rotary shaft 16 and the wheel 20 may be formed in advance as an integrated object.

Each wheel 20 is a bottom rotating body having a bottom surface 22 that is substantially flat and a vertical rotational axis 16 that is a rotationally symmetric axis, and an annular grounding surface 26 is formed between the side surface 24 and the bottom surface 22. Note that the “bottom floor” means a shape when the bottom side of an arbitrary rotationally symmetric object is cut along a plane parallel to the symmetry axis. And the bottom surface does not have to be strictly flat.

The annular ground surface 26 is formed so as to be in proper contact with the traveling surface S by forming a square shape that protrudes outward and downward. Even if it is referred to as “square shape”, it may be a form having a certain degree of roundness. The two-wheel traveling toy of the present application acquires a propulsive force when the wheel 20 is rotated by the frictional force between the annular ground surface 26 and the traveling surface S. In general, the wheel propulsive force is given by the wheel torque at the contact point, that is, the product of the wheel angular velocity and the wheel diameter. Therefore, in the case of the wheel 20 of the present invention, the axis of the vertical rotating shaft 16 (vertical It becomes larger substantially in proportion from shall refer to a straight line passing through the center of the shaft rod of the rotating shaft) to the magnitude of the radius r to the inner peripheral edge e _I of the annular contact surface 26. However, the rotation speed per unit time of the wheel 20 is assumed to be constant. The size of the radius r is set so that a required driving force can be obtained. In the drawing, e 2 _O represents the outer peripheral end of the annular ground surface 26.

  The wheel 20 can be formed of a material suitable for securing the above-described frictional force such as synthetic resin or rubber.

  The wheel of the two-wheeled toy of the present application has a ring-shaped grounding surface 26 between the bottom surface 22 and the side surface 24 around the vertical rotation axis, so that it is a normal tire that rotates around the horizontal rotation axis. Also, it is a deformed wheel that is different from the top grounded in the vicinity of the vertical rotating shaft.

  In the illustrated example, the side surface 24 of the wheel 20 is a vertical surface parallel to the vertical rotation shaft 16, but need not be parallel to the vertical rotation shaft 16 (see FIG. 19 described later). This is because the side surface 24 of the wheel 20 does not serve as a ground contact surface as described above.

  9 and 10 depict a traveling platform 30 for traveling the two-wheel traveling toy 1 described above. The traveling platform 30 is formed by hanging a peripheral wall portion or a side wall portion 30b from the outer peripheral portion of the top wall portion 30a, and a shallow circular recess 32 is formed at the center of the top wall portion 30a. It has a substantially arc-shaped outline in a longitudinal section passing through the center. A traveling surface S is formed on the upper surface of the circular recess 32, and the two-wheeled traveling toy 1 is provided so as to be able to turn in the circumferential direction as indicated by an imaginary line in FIG. Further, an upright wall portion 34 for preventing the two-wheel traveling toy 1 from popping out is raised from the outer peripheral portion of the top wall portion 30a.

FIG. 11 is a perspective view of the two-wheeled traveling toy 1 traveling in the circumferential direction on the traveling surface S. The pair of wheels 20 are rotating in the same direction. In the traveling surface S having an arcuate longitudinal section, only one point (the grounding point Pc) outside the annular grounding surface 26 of the wheel 20 is in contact with the traveling surface, and the thrust F acts in the direction of the white arrow, and the circumferential direction. Revolves at a constant speed. The speed at this time is given by the product of r and ω, where r is the distance or radius from the axis of the wheel 20 to the inner peripheral edge e _I of the annular grounding surface 26 and ω is the angular velocity of the wheel 20.

FIG. 12 depicts a state in which the two-wheel traveling toy 1 of the present application runs on the traveling surface S. Gravity Mg and centrifugal force C act on the center of gravity G of the two-wheel traveling toy 1, and a drag N acts on the ground contact point Pc that contacts the travel surface S in the annular ground surface 26. In order for the two-wheel traveling toy 1 to continue traveling without falling to the side (right or left in the drawing) with respect to the traveling direction, torque about the ground contact point Pc, that is, moment C × R ₂ of gravity and gravity Moments Mg × R ₁ must be balanced. Here, R ₁ is the horizontal distance from the ground point to the center of gravity, R ₂ is the vertical distance from the ground point to the center of gravity, and r ≦ R ₁ .

For simplicity, the drawing shows a state in which the two-wheel traveling toy 1 is vertically upright, and in this state, the two moments are balanced. When the centrifugal force C increases, the two-wheel traveling toy 1 tilts to the outside of the traveling platform 30, and when the centrifugal force C decreases, the two-wheel traveling toy 1 tilts to the inner side of the traveling platform 30. The centrifugal force C increases in proportion to the speed of the two-wheel traveling toy 1 that runs in the circumferential direction through the circular recess 32.

In summary, in the configuration of the wheel 20 of the present invention, since there is at least a distance r between the axis of the vertical rotation shaft 16 and the grounding point Pc, the propulsion in the horizontal direction is larger than that of the top. Force and speed are obtained. However, when the distance r is increased, the moment of gravity Mg × R ₁ becomes superior to the moment of centrifugal force C × R ₂ , and it is easy to fall inward. In order to avoid this, it is desirable to increase the position of the center of gravity G of the two-wheeled toy 1. In the illustrated example, which is a preferred embodiment, the height of the center of gravity G is larger than r, but the structure can be changed as appropriate.

  In the revolving motion state of FIG. 11, when the moment of gravity is greater than the moment of centrifugal force, the two-wheeled traveling toy 1 tilts inward. The two-wheeled toy 1 gradually lowers the track toward the center of the circular recess 32 and finally reaches the center of the circular recess 32 as shown in FIG. In this state, the pair of wheels 20 are in contact with the traveling surface S at the front contact point Pc and the rear contact point Pc of the two-wheel traveling toy 1. As a result, when the wheel 20 is rotated in the same direction, the entire two-wheel traveling toy 1 performs a rotation motion as shown in FIG.

  FIG. 14 is a diagram for explaining the function of the auxiliary protrusion 18, FIG. 14 (A) shows the operation of the two-wheeled traveling toy 1 having the auxiliary protrusion 18, and FIG. 14 (B) is the auxiliary protrusion. The operation | movement of the two-wheeled traveling toy 1 which does not have a piece is each shown.

  First, in the case of FIG. 14B, when the vehicle body 2 tilts from the initial position of (b-1) and rises to the position of (b-2) indicated by the solid line, and the vehicle body 2 comes into contact with the running surface. In addition, the inclination angle of the vehicle body 2 is large. At this time, since the side edge Ms of the vehicle body 2 is located near the center of gravity G when viewed from above, the frictional force between the vehicle body 2 and the running surface also increases. Therefore, the speed of the two-wheeled traveling toy 1 does not increase, and the two-wheeled traveling toy 1 stays at a relatively low position (b-2) or slides down to a lower position. In this case, it rotates as shown in FIG. Thus, the performance of the two-wheel traveling toy 1 cannot be exhibited sufficiently.

  On the other hand, in the case of FIG. 14A, the vehicle body 2 tilts from the initial position of (a-1) and rises to the position of (a-2) so that the tip 18a of the auxiliary protruding piece 18 is the running surface. When in contact with the vehicle body 2, the inclination angle of the vehicle body 2 is small. For this reason, the frictional force between the tip 18a of the auxiliary protrusion 18 and the running surface does not increase. Therefore, the two-wheel traveling toy 1 can be raised to a higher position (a-3) while maintaining the speed.

  Hereinafter, other embodiments of the present invention will be described. In these descriptions, the same components as those in the first embodiment are denoted by the same reference numerals and the description thereof is omitted.

  15 to 18 show a two-wheeled traveling toy 1 according to the second embodiment of the present invention. In the present embodiment, the annular grounding surface 26 has a curved shape that protrudes outward and downward from the wheel 20 when viewed in a vertical cross section passing through the axis. In this embodiment, the width d along the curved surface can be made larger as shown in FIG. 15 than in the first embodiment. Thereby, the frictional force between the wheel 20 and the running surface S can be sufficiently secured.

In the present embodiment, as a result of the annular contact surface 26 of the wheel 20 having a curved shape, the side edge Ms of the vehicle body 2 is located near a virtual straight line connecting the contact point Pc of the annular contact surface 26 and the tip 18a of the auxiliary protrusion 18. Is located. As shown in FIG. 18, in the state where the two-wheeled toy 1 is placed obliquely on the horizontal surface S, the ground contact point Pc, the side edge Ms, and the surface S are on the same surface, and the side edge Ms during traveling. Seems to rub. However, the two-wheel traveling toy 1 of the present application is for traveling on a curved surface such as a circular recess shown in FIG. Accordingly, the curvature of the saddle curved surface is set so that the side edge Ms does not contact the saddle curved surface in a state where the contact point Pc and the tip 18a of the auxiliary protrusion 18 are in contact with the saddle curved surface. A two-wheeled toy can travel efficiently.

  FIG. 19 shows a two-wheeled traveling toy 1 according to a third embodiment of the present invention, and FIG. 20 shows a driving jig 40 for causing the two-wheeled traveling toy 1 to travel.

  In the present embodiment, the power mechanism 5 of the two-wheel traveling toy 1 includes a flywheel 5a provided at an appropriate position of the vehicle body 2, a driven gear 5b connected to the flywheel 5a, and a frame 5c surrounding the driven gear 5b. And formed. The flywheel 5 a is linked to the pair of wheels 20 via the power transmission means 6. The drive jig 40 has a handle 40b attached to the base of an elongated rack 40a. Then, when the rack 40a of the driving jig 40 is inserted between the driven gear 5b and the frame 5c and pulled quickly, the flywheel 5a rotates, and the pair of wheels 20 also rotate with it.

DESCRIPTION OF SYMBOLS 1 ... Two-wheel running toy 2 ... Car body 2a ... Lower half 2b ... Upper half 3 ... Swelling part 4 ... Lid 4a ... Connection protrusion 5 ... Power mechanism 5a ... Flywheel 5b ... Drive gear 5c ... Frame 6 ... Power Transmission means 8 ... battery 10 ... insertion hole
DESCRIPTION OF SYMBOLS 12 ... Bearing 16 ... Vertical rotating shaft 17 ... Mounting part 18 ... Auxiliary protrusion 18a ... Tip 18b ... Base end 18c ... Notch 20 ... Wheel 22 ... Bottom surface 24 ... Side surface 26 ... Annular ground surface 28 ... Shaft fitting cylinder part 30 ... Travel platform 30a ... Top wall 30b ... Side wall
32 ... circular recess 34 ... upright wall portion 40 ... driving jig 40a ... rack 40b ... Handle C ... Centrifugal force d ... width e I _... inner peripheral end e O _... outer peripheral edge F ... propulsion G ... centroid Mg ... gravity Ms ... side edge N ... drag Pc ... radius S from the axis of the vertical distance r ... vertical rotation axis from a horizontal distance R 2 _... ground point from the ground point R 1 _... ground point to the center of gravity to the center of gravity to the inner peripheral edge of the annular grounding surface ... Surface (travel surface)

Claims (5)

A vehicle body with a power mechanism,
A pair of vertical rotating shafts that are linked to the power mechanism and project downward from both front and rear sides of the vehicle body;
Around a lower part of each vertical rotation axis, a pair of wheels formed as a bottom rotary body having the vertical rotation axis as a rotationally symmetric axis and a substantially flat bottom surface;
Comprising
A two-wheeled toy characterized in that an annular grounding surface is formed between the bottom and side surfaces of the wheel.   The two-wheeled vehicle according to claim 1, wherein the annular ground contact surface has a curved shape that protrudes outward and downward continuously with a contour of the bottom surface and the side surface as viewed in a cross section passing through an axis of a vertical rotation axis of the wheel. Traveling toy.   3. The two-wheeled toy according to claim 1, wherein the height of the entire center of gravity is larger than a radius from the axis of the vertical rotation axis to the inner peripheral end of the annular grounding surface.   From the side of the vehicle body, at least one auxiliary protruding piece for regulating the inclination of the vehicle body protrudes to the side, and when the two-wheeled toy is placed on a horizontal plane with the vehicle body inclined posture, The length of the auxiliary protrusion is designed so that the center of gravity is between the tip of the auxiliary protrusion and the wheel as viewed from above. The two-wheeled toy as described. A combination set of a two-wheeled toy and a traveling platform according to claim 4,
The above-mentioned traveling platform forms a shallow circular recess for the two-wheel traveling toy to travel in the circumferential direction on the top surface of the top wall, and this circular recess is substantially arc-shaped when viewed in the longitudinal sectional direction passing through its center line. The curvature of the arc is designed so that the side edge of the lower surface of the vehicle body does not contact the circular recess when the wheel and the tip of the auxiliary projection piece are in contact with the circular recess. To
Combination set of two-wheeled toy and traveling platform.

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