JP4187756B2 - Wheel fixing structure - Google Patents

Description

  The present invention relates to a wheel fixing structure, and more particularly to a wheel fixing structure capable of connecting a plurality of axles having different diameters to one wheel.

In recent years, robot contests that compete in superiority or inferiority in junior high school / high school, technical college, etc., where robots created by each student perform game-to-game battles, stacking boxes and transporting balls Is held.
In the robot contest, various robots are produced by combining the machine parts while each student gives an idea.
Such work parts include, for example, wheels configured as a robot traveling device and axles for rotating the wheels.

Conventional axles that are generally available on the market use two types of axles with different diameters (3 mm and 4 mm), and the axles with a diameter of 3 mm have a hexagonal cross section. An axle having a diameter of 4 mm has a circular cross section.
On the other hand, there is no wheel that can be connected to the two axles in common, and there is no wheel that is fixed to the axle. It was necessary to have two kinds of wheels.
That is, a wheel that can connect an axle having a diameter of 3 mm by press-fitting and a wheel that can connect an axle having a diameter of 4 mm must be separately provided.
For example, Patent Document 1 discloses a gear box formed so that a wheel can be connected to an output shaft. However, a wheel connected to an axle provided in such a gear box is the above-mentioned axle. The size and shape of the connecting portion are designed according to the diameter and shape, and it is inconvenient because it cannot be fixed to an output shaft having a different diameter.
Further, Patent Document 2 discloses a model reduction gear provided with an axle, but the size and shape of the axle provided in such a reduction gear is also designed in accordance with the wheel fixed to the axle. Therefore, when the wheel is replaced with an axle having a different diameter, the wheel connected to the wheel must be changed.

JP 2004-258135 A Japanese Utility Model Publication No. 63-128350

  SUMMARY OF THE INVENTION An object of the present invention is to provide a wheel fixing structure that can be connected to a plurality of types of axles having different diameters with one wheel.

  In order to solve the above problems, a wheel fixing structure according to the present invention is a wheel fixing structure formed so as to be connectable to an axle having a plurality of diameters, and is provided on the wheel and the wheel. It is formed by a shaft fixing hole and a connecting member formed so that the wheel can be fixed to the axle, and the wheel is connected to the axle having one diameter through the shaft fixing hole. And it is formed so that it can fix via the connection member with respect to the axle shaft which has another diameter dimension different from the axle shaft which has the said one diameter dimension.

  That is, an axle having one diameter dimension can be directly fixed to the wheel via the shaft fixing hole provided in the wheel, and another diameter dimension different from the axle having the one diameter dimension. The axle which has can be fixed with the said wheel via a connection member.

  Moreover, in the fixing structure of the wheel according to the present invention, the end portion of the axle having the other diameter is engaged with a screw portion for fixing to the connecting member and the connecting member. Is provided with a rotation stop portion that can fix the relative rotation between the axle and the wheel, and the rotation stop portion is formed as a protrusion that protrudes in a direction perpendicular to the length direction of the axle. ing.

  That is, the axle having the other diameter is fixed to the connection member using the screw portion, and the connection member is engaged by engaging the protrusion formed as the rotation stop portion with the connection member. Mutual rotation with the member is prevented.

  Further, in the wheel fixing structure according to the present invention, the connecting member includes an axle mounting portion that can be fixed to the screw portion provided on the axle having the other diameter, and the other diameter. An anti-rotation engaging portion that can be engaged with the protrusion formed on the side surface portion of the axle having a dimension, and a wheel fixing portion that is formed so as to be engaged with the wheel are provided.

That is, the connecting member is fixed to the axle by the axle mounting portion and the screw portion, and prevents the rotation with the axle by the anti-rotation engaging portion and the anti-rotation portion.
Moreover, it fixes so that it can rotate integrally with respect to the said wheel by the said wheel fixing | fixed part.

  In the wheel fixing structure according to the present invention, the connection member includes a base plate portion and a cylindrical portion formed on the base plate portion, and the axle mounting portion is a center of the base plate portion. The side surface portion of the substrate portion is provided with a groove portion with which the protrusion can be engaged, and the other side surface portion is provided with the wheel fixing portion, and the wheel fixing portion is The end surface portion is in contact with the wheel at a plurality of locations along the peripheral edge of the cylinder portion, and is formed so that a screw member for fixing the wheel can be inserted into the inside.

That is, in the connection member, the axle is fixed to the center portion of the base plate portion, and the protrusion of the axle engages with the groove portion formed on one side surface portion of the base plate portion.
Further, the wheel fixing portion is provided on the other side surface portion of the substrate portion, and a screw member is inserted into the wheel fixing portion to be fixed to the wheel.

  Further, in the wheel fixing structure according to the present invention, the shaft fixing hole is provided in the center of the wheel, and is provided in the connection member at a plurality of locations around the shaft fixing hole. A screw insertion hole that can correspond to the wheel fixing part is provided.

That is, the wheel is provided so as to be connected to and rotated with respect to the axle having the one diameter dimension around the shaft fixing hole.
In addition, the connection member is fixed and connected to the wheel at a plurality of locations around the center, but the wheel fixing portion formed for fixing to the wheel can be inserted through a screw member. It is formed corresponding to the screw insertion hole.

The wheel fixing structure according to the first aspect of the present invention is a wheel fixing structure formed so as to be connectable to an axle having a plurality of diameters, and a wheel and a shaft fixing hole provided in the wheel. And a connecting member formed so that the wheel can be fixed to the axle, and the wheel is connected to the axle having one diameter through the shaft fixing hole, and The axle having the one diameter is inserted into the shaft fixing hole because the axle having the other diameter is different from the axle having the one diameter and can be fixed via a connecting member. By doing so, an axle having another diameter can be connected to the wheel via the coupling member. That is, a plurality of types of axles having different diameters can be connected to one wheel.
Therefore, it is not necessary to prepare a plurality of types of wheels that can correspond to the diameter dimension of the axle so as to cope with a plurality of types of axles having different diameter dimensions.

In the wheel fixing structure according to the second aspect of the present invention, an end portion of the axle having the other diameter is engaged with a screw portion for fixing to the connection member and the connection member. An anti-rotation portion that can fix relative rotation between the axle and the wheel is provided, and the anti-rotation portion is formed as a protrusion that protrudes in a direction perpendicular to the longitudinal direction of the axle. Therefore, the axle having the other diameter can be easily fixed to the connection member by the screw portion, and the connection member has the other diameter by the rotation preventing portion. Since it rotates integrally with the axle, the rotational motion transmitted by the axle can be transmitted to the wheels.
Further, the rotation stopper can be easily formed by the protrusion.

  According to a third aspect of the present invention, there is provided the wheel fixing structure according to the present invention, wherein the connecting member includes an axle mounting portion that can be fixed to the screw portion provided on an axle having the other diameter, and the other diameter. A rotation-stop engaging portion that can be engaged with the protrusion formed on the side surface portion of the axle having a wheel, and a wheel fixing portion that is formed so as to be able to engage with the wheel. The member and the axle having the other diameter can be fixed so as not to rotate with each other, and can be rotated integrally with each other, and the connecting member is fixed to the wheel by the wheel fixing portion. Thus, the axle having the other diameter and the wheel can be easily fixed and connected.

According to a fourth aspect of the present invention, in the wheel fixing structure, the connection member includes a base plate portion and a cylindrical portion formed on the base plate portion, and the axle mounting portion is a central portion of the base plate portion. The side surface portion of the substrate portion is provided with a groove portion with which the protrusion can be engaged, and the other side surface portion is provided with the wheel fixing portion. Since the end surface portion is in contact with the wheel at a plurality of locations along the peripheral edge portion of the portion and the screw member for fixing the wheel can be inserted into the inside, the axle having the other diameter is described above. By fixing to the axle mounting portion, it can be connected to the center portion of the substrate portion, and by engaging the protrusion with the groove portion, the axle having the other diameter can be connected to one side surface of the substrate portion. The other diameter dimensions above are easily connected The axle and the connecting member can be rotated integrally.
Moreover, the connection member and the wheel can be easily connected and stably fixed by the screw member inserted into the wheel fixing portion while the wheel is supported by the end surface portion of the wheel fixing portion.

In the wheel fixing structure according to the fifth aspect of the present invention, the shaft fixing hole is provided in the center of the wheel, and is provided in the connection member at a plurality of locations around the shaft fixing hole. Since the screw insertion hole portion that can correspond to the wheel fixing portion is provided, the axle having the one diameter is connected to the center portion of the wheel by being inserted into the shaft fixing hole portion. The wheel can be rotated around the shaft fixing hole.
Further, by inserting and fixing the screw member into the wheel fixing portion provided in the connection member and the screw insertion hole portion of the wheel provided corresponding thereto, the connection member and the wheel are connected. Can be fixed and easily connected.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
The wheel 11 fixing structure 14 according to the present embodiment is a wheel 11 fixing structure 14 formed so as to be connectable to axles 12 and 13 having a plurality of radial dimensions, as shown in FIGS. 1 to 6. The wheel 11, the shaft fixing hole portion 22 provided in the wheel 11, and the connecting member 15 formed so that the wheel 11 can be fixed to the axle 13 are formed, and the wheel 11 has one diameter. As shown in FIG. 7, the axle 12 having a size is connected via the shaft fixing hole 22, and the axle 13 having another diameter different from the axle 12 having the one diameter. As shown in FIG. 9, it is formed so as to be fixable via a connecting member 15.
Further, as shown in FIGS. 2 and 8, the end portion of the axle 13 having the other diameter is engaged with a screw portion 16 for fixing to the connection member 15 and the connection member 15. Is provided with an anti-rotation portion 17 that can fix the relative rotation between the axle 13 and the wheel 11, and the anti-rotation portion 17 is formed so as to protrude in a direction perpendicular to the length direction of the axle 13. The protrusion 18 is formed.
Further, as shown in FIGS. 3 to 6, the connecting member 15 includes an axle mounting portion 26 that can be fixed to the screw portion 16 provided on the axle 13 having the other diameter, and the other diameter. An anti-rotation engaging portion 36 that can be engaged with the projection 18 formed on the side surface portion of the axle 13 having a size, and a wheel fixing portion 29 that is formed so as to be engaged with the wheel 11 are provided. Yes.
Further, as shown in FIGS. 3 to 6, the connecting member 15 includes a base plate portion 25 and a cylindrical portion 28 formed on the base plate portion 25, and the axle mounting portion 26 includes the base plate portion 25. The groove portion 27 with which the projection 18 can be engaged is provided on one side surface portion of the substrate portion 25, and the wheel fixing portion 29 is provided on the other side surface portion. The wheel fixing portion 29 is formed so that the end surface portion 31 abuts the wheel 11 at a plurality of locations along the peripheral edge portion of the cylindrical portion 28 and the wheel fixing screw member 30 can be inserted into the wheel fixing portion 29.
Further, as shown in FIG. 1, the shaft fixing hole portion 22 is provided in the center portion of the wheel 11, and the connection member 15 is provided at a plurality of locations around the shaft fixing hole portion 22. A screw insertion hole 24 that can correspond to the wheel fixing part 29 is provided.

1 to 10 show a fixing structure 14 for a wheel 11 and axles 12 and 13 according to an embodiment.
In the fixing structure 14 according to the present embodiment, the wheel 11 as shown in FIG. 1, the two axles 12 and 13 as shown in FIG. 2, and the connecting member 15 as shown in FIGS. It is configured.

FIG. 2 shows two types of metal axles 12 and 13 used in the fixing structure 14 according to this embodiment.
The axle 12 having one diameter dimension has an outer diameter dimension of 3 mm, and the cross section is formed in a hexagon.
The axle 13 having other diameter dimensions has an outer diameter dimension of 4 mm, and has a circular cross section.

The other axle 13 is provided with a threaded portion 16 at the end in the longitudinal direction on the side where the wheel 11 is attached, and a rotation stopper 17 near the inner side of the threaded portion 16.
The rotation stop portion 17 is formed as projections 18, 18 on the side surface portion of the axle 13, and two projections 18, 18 are formed so as to protrude perpendicular to the length direction of the axle 13.

FIG. 1 shows the inner side surface of the wheel 11 in the axial direction.
The wheel 11 includes a plastic wheel portion 19 such as ABS resin and a rubber tire portion 20 mounted on the outer periphery of the wheel portion 19. A cylindrical bearing is provided at the center of the wheel portion 19. A portion 21 is provided, and a shaft fixing hole portion 22 is provided inside the bearing portion 21.
The shaft fixing hole 22 is formed in a hexagonal cross section having a cross-sectional shape substantially the same as the cross-sectional shape of the one axle 12, and the one axle 12 is press-fitted and connected. The wheel 11 can be fixed to the axle 12.
In this case, since the other axle 13 has a cross-sectional shape and a diameter that are different from those of the shaft fixing hole portion 22, it cannot be press-fitted, and the other axle 13 and the wheel 11 cannot be directly connected.

Further, in the wheel 11, bottomed short cylindrical connecting member engaging portions 23, 23, 23 are provided at three locations around the shaft fixing hole portion 22. A screw insertion hole 24 is provided at the center.
Each of the connecting member engaging portions 23, 23, 23 is provided at three locations equally about every 120 degrees with the shaft fixing hole portion 22 as the center.

3 to 6 show the connection member 15.
The connecting member 15 is formed so as to be able to connect the wheel 11 that could not be independently connected to the other axle 13 having a diameter different from that of the one axle. The connecting member 15 is made of plastic such as ABC resin.

The connecting member 15 has a board portion 25 formed in a disk shape, and an axle mounting portion 26 is provided at the center of the board portion 25.
The axle mounting portion 26 is formed so as to protrude in a cylindrical shape from one side surface portion of the base plate portion 25, and a rotation stop engaging portion 36 is provided on the axle mounting portion 26.
The anti-rotation engaging portion 36 is formed as a substantially cross-shaped groove portion 27 at the tip edge portion of the axle mounting portion 26.
The groove 27 is formed so that the projections 18 and 18 formed on the axle 13 can be engaged with each other.

A cylindrical portion 28 is formed on the other side surface portion of the base plate portion 25, and the axle is formed along the peripheral edge portion of the cylindrical portion 28 corresponding to each connecting member engaging portion 23 formed on the wheel 11. Cylindrical wheel fixing portions 29, 29, and 29 are provided at three locations equally about every 120 degrees centering on the attachment portion 26.
Accordingly, the distance between the shaft fixing portion 22 provided on the wheel 11 and each connecting member engaging portion 23, 23, 23, the axle mounting portion 26 provided on the connecting member 15, and each axle fixing portion. The distance between 29, 29 and 29 is substantially the same as the distance.
Further, the outer diameter dimensions of the cylindrical portions 28, 28, 28 of the wheel fixing portions 29, 29, 29 provided on the connection member 15 are formed in a short cylindrical shape provided on the wheel 11. The connecting member engaging portions 23, 23, 23 are formed to have substantially the same diameter as the inner diameter.
Therefore, by engaging the cylinder portions 28, 28, 28 of the wheel fixing portions 29, 29, 29 on the inner sides of the connection member engaging portions 23, 23, 23, respectively, The connection member 15 can be fixed to the wheel 11.
Each wheel fixing portion 29 is formed so that the screw member 30 can be inserted therein, and the end surface portion 31 is formed so as to be in contact with the connection member engaging portion 23 provided on the wheel 11. Yes.
Therefore, the wheel fixing portions 29, 29, 29 provided on the connection member 15 and the connection member engaging portions 23, 23, 23 provided on the wheel 11 are communicated with screws. By inserting the members 30 respectively, the connecting member 15 and the wheel 11 can be connected and fixed to each other.

Next, the operation of this embodiment will be described.
The axle 12 having the one diameter dimension is fixedly connected to the wheel 11 by press-fitting one end in the length direction into the shaft fixing hole portion 22 provided in the bearing portion 21 of the wheel 11. be able to.
On the other hand, the axle 13 having the other diameter can be connected to the wheel 11 via the connecting member 15.
That is, by using the connecting member 15, it is possible to connect and fix the plurality of types of axles 12 and 13 only by preparing one wheel 11.
Therefore, it is not necessary to prepare and prepare a plurality of types of wheels having different axle mounting sizes corresponding to a plurality of types of axles having different diameters.

In order to fix the wheel 11 to the other axle 13, first, the other axle 13 and the connecting member 15 are fixed as shown in FIGS. 8 and 9.
As shown in FIG. 8, the axle 13 has the threaded portion 16 formed at the distal end thereof inserted into the axle mounting portion 26 of the connecting member 15, and a nut 32 at the longitudinally distal end of the threaded portion 16. It can be fixed by screwing.
In that case, the projection 18 formed on the axle 13 is engaged with the groove 27. As a result, the axle 13 is prevented from rotating with respect to the connecting member 15, relative rotation between the other axle 13 and the connecting member 15 is prevented, and the rotational force of the axle 13 is reliably applied to the connecting member 15. Communicated.
The connecting member 15 is sandwiched between the projections 18 and 18 and a nut 32 screwed to the tip of the screw portion 16, and the connecting member 15 is connected to the other axle 13. Fixed.
Next, the connecting member 15 fixed to the axle 13 and the wheel 11 are fixed.
In order to fix the connection member 15 and the wheel 11, as shown in FIG. 9, the end surface portion 31 of the wheel fixing portion 29 provided on the connection member 15 is connected to the connection provided on the wheel 11. The end surface portion 31 of the wheel fixing portion 29 is brought into contact with the wheel 11 by engaging with the member engaging portion 23.
In this state, the screw member 30 is inserted from the outer surface portion of the wheel 11 into the screw insertion hole 24 of the wheel 11, and the screw member 30 is further inserted into the wheel fixing portion 29 of the connection member 15. Then, the nut 33 is screwed onto the tip end portion of the screw member 30 protruding from the wheel fixing portion 29.
Thereby, the connection member 15 and the wheel 11 are fixed, and the other axle 13 can be fixed to the wheel 11 via the connection member 15.
That is, by using the connection member 15, the wheel 11 that cannot be directly fixed to the other axle 13 can be easily fixed.
As shown in FIG. 10, the other end of the other axle 13 fixed to the wheel 11 can be connected to a driving device 35 fixed on a mounting board 34. The axle 13 and the wheel 11 can be rotated integrally.

  The present invention is a work part used for manufacturing a robot for teaching materials and the like, and can be applied to a plurality of wheels that may be fixed to axles having different diameters.

It is an inner side view of the wheel which concerns on the Example of this invention. It is a perspective view of two types of axles concerning the example of the present invention. It is a perspective view of the connection member concerning the example of the present invention. It is an inner side view of the connection member which concerns on the Example of this invention. It is an outer side view of the connection member which concerns on the Example of this invention. It is a top view of the connection member concerning the example of the present invention. It is sectional drawing of the state which connected the axle which has one diameter dimension which concerns on the Example of this invention to the wheel. It is sectional drawing of the state which connected the axle which has the other diameter size which concerns on the Example of this invention to the connection member. It is sectional drawing of the state which connected the axle shaft which has the other diameter size which concerns on the Example of this invention to the wheel via the connection member. It is a top view which shows the state which connected the wheel which concerns on the Example of this invention, and the fixed axle shaft to the drive device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Wheel 12 Axle 13 Axle 14 Fixing structure 15 Connecting member 16 Screw part 17 Anti-rotation part 18 Protrusion 19 Wheel part 20 Tire part 21 Bearing part 22 Shaft fixing hole part 23 Connecting member engaging part 24 Screw insertion hole part 25 Substrate part 26 Axle mounting portion 27 Groove portion 28 Tube portion 29 Wheel fixing portion 30 Screw member 31 End surface portion 32 Nut 33 Nut 34 Mounting substrate 35 Drive device 36 Anti-rotation engaging portion

Claims (5)

A wheel fixing structure formed to be connectable to an axle having a plurality of diameters,
Formed by a wheel, a shaft fixing hole provided in the wheel, and a connecting member formed so that the wheel can be fixed to the axle;
The wheel is connected to the axle having one diameter through the shaft fixing hole,
A wheel fixing structure, wherein the wheel fixing structure is configured to be fixable via a connecting member to an axle having another diameter different from the axle having the one diameter. An end portion of the axle having the other diameter is provided with a screw portion for fixing to the connection member, and a rotation stopper capable of fixing relative rotation between the axle and the wheel by engaging with the connection member. Are provided,
The wheel fixing structure according to claim 1, wherein the rotation stop portion is formed as a protrusion formed so as to protrude in a direction orthogonal to the longitudinal direction of the axle. The connecting member is engaged with the screw portion provided on the axle having the other diameter and the axle mounting portion that can be fixed, and the protrusion formed on the side surface of the axle having the other diameter. The wheel fixing structure according to claim 2, further comprising an anti-rotation engaging portion capable of engaging with the wheel and a wheel fixing portion formed so as to be able to engage with the wheel. The connection member has a substrate portion and a cylindrical portion formed on the substrate portion,
The axle mounting portion is provided at the center of the substrate portion,
On one side surface of the substrate portion, a groove portion on which the projection can be engaged is provided, and on the other side surface portion, the wheel fixing portion is provided.
The wheel fixing part is formed so that end face parts abut against the wheel at a plurality of locations along the peripheral edge of the cylinder part, and a screw member for fixing the wheel can be inserted into the wheel fixing part. The wheel fixing structure according to claim 3.   The shaft fixing hole portion is provided at the center of the wheel, and a screw insertion hole portion corresponding to the wheel fixing portion provided in the connection member is provided at a plurality of locations around the shaft fixing hole portion. 5. The wheel fixing structure according to claim 4, wherein the wheel fixing structure is provided.

Images