JPH11254903A - Coupled wheel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid the labor of assembling a coupled wheel. SOLUTION: In a peripheral wall of a cylindrical part 1 of each wheel piece 10, a projection 3 and a recess 4 are provided which are mutually fitted by insertion in the axial direction, and on an end and a bottom of the projection 3 and the recess 4, a projecting portion 13 along the peripheral direction and a recess portion 14 to be fitted into the projecting portion 13 are respectively formed in a continuous manner. Surfaces which are opposite in the axial direction of the projecting portion 13 and the recess portion 14 are tilt surfaces 13' and 14', respectively. Coupling of the wheel pieces 10 is accomplished by: inserting the projection 3 of the axial direction into the recess 4; bringing the projecting portion 13 to the position where it fits into the recess portion 14; rotating the wheel pieces 10 in the peripheral direction in relation to each other, thereby engaging the projecting portion 13 with the recess portion 14 of the peripheral direction; and then injecting air into a tube to cause a bead portion to disengage rims 2, 2 of the wheel pieces 10, 10. As a result, the tilt surface 13' of the projecting portion 13 and the tilt surface 14' of the recess portion 14 are engaged in the axial direction and rotation in the peripheral direction of the wheel pieces 10, 10 is prevented. The pair of wheel pieces 10 can thus be coupled without using a bolt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dowel wheel, and more particularly to an assembling structure thereof.

[0002]

2. Description of the Related Art Wheels of tubeless tire specifications used for automobiles and motorcycles are one-piece products. In this one-piece wheel, since the facing distance between the rims is constant, inserting a hard bead between the rims when mounting the tire requires a large force and is a very troublesome operation.

[0003] On the other hand, since a combined wheel combines two pairs of wheel pieces to form one wheel, when the tires are mounted on the wheels, the tires are arranged along the rim of each wheel piece. Then, the two wheel pieces are fixed together. Therefore, the tire can be easily assembled. The matching wheel is used for a tire with a tube, and is used for a unicycle of a wheelbarrow for transporting earth and sand or cement manually at a construction site.

[0004]

By the way, the above-mentioned mating wheel connects a pair of wheel pieces, and the connecting form is such that the opposing surfaces of the wheel pieces are tightened with bolts arranged in the axle direction. Is going. Therefore, when assembling, it takes time and effort to tighten the bolts, resulting in poor work efficiency and hindering reduction in manufacturing cost.

It is an object of the present invention to reduce the time and effort required for assembling a dowel wheel.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention relates to a method in which one wheel is formed by connecting the other ends of a pair of wheel pieces having a flange-shaped rim standing at one end of a cylinder. In the mating wheel to be formed, an engagement structure that engages with each other is provided at each other end, and the engagement structure is engaged so as to be joined. As the engagement structure, one of the wheel pieces is used. On the peripheral wall of the cylindrical portion, a convex portion protruding axially from the outer peripheral surface with a predetermined thickness, and on the outer peripheral surface of the peripheral wall of the cylindrical portion of the other wheel piece, the convex portion can be inserted and the thickness of the convex portion can be inserted. The tip of the convex portion and the bottom of the concave portion are formed in a key shape and a concave portion which are respectively engaged in the circumferential direction, and after the key shape and the concave portion are engaged in the circumferential direction, Injection of air into the tire tube between the rims causes the rims to separate in the axial direction. By, the key-shaped and the recess is or to couple engaged in the axial direction (claim 2),
When the opposite surface of the cylindrical portion of each wheel piece has a lid, a ridge and a fitting inlet are provided on the opposite surface when the two wheels are approached to each other. The end has a key shape in the direction along the end surface, and when the ridge is inserted into the fitting entrance and both wheels are imposed and rotated in the opposite direction, the key shape is on the inner surface of the opposing surface. It is possible to adopt a configuration (claim 4) in which both the cylinders are brought into contact with each other and axially engaged with each other, and the end faces of both cylinders are provided with screw holes for inserting screws for rotation prevention.

At this time, in the case where each wheel piece has a screw hole for preventing rotation, if the portions other than the wheel piece are formed to have the same shape (claims 3 and 5), gold Since only one mold is required, manufacturing costs can be reduced.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

(First Embodiment) In a mating wheel, each of a pair of wheel pieces has a flange-shaped rim erected at one end of a cylinder. As shown in FIG. 3, the cylindrical portion 1 of each wheel piece 10 is provided with an engagement structure that engages with the other wheel piece 10. This engagement structure is the cylindrical portion 1
Is provided with a convex portion 3 and a concave portion 4 which are axially inserted into each other when the ends on the side opposite to the rim 2 are opposed to each other with their cylindrical axes aligned.

[0010] Each end and bottom of the convex portion 3 and the concave portion 4 in the axial direction are further provided with a convex portion 13 along the circumferential direction.
And a concave portion 14 into which it is fitted is provided continuously. The convex portion 13 and the concave portion 14 along the circumferential direction prevent the two wheel pieces 10 and 10 from rotating with each other after the two wheel pieces 10 are engaged with each other.
3 'and 14'. In this embodiment,
The wheel is manufactured by aluminum die-casting, and a valve hole 5 for passing a valve (not shown) for injecting air into the tire tube is formed on the peripheral surface of the cylindrical portion of one of the wheels by post-processing after manufacturing the wheel using a mold. Is provided.

When assembling a wheel using such a combination wheel, first, a bead portion of a tire is mounted inside the rim 2 of each wheel piece 10. The mounting of the bead portion is very easy without requiring a large force because the bead can be individually mounted on each wheel, unlike the case of a single-piece specification wheel. At this time, the tire is allowed to peep out of the wheel from the valve hole 5 through the valve of the tire tube.

When the tires are temporarily mounted on the respective wheel pieces 10, the wheel pieces 10 themselves are joined together. At this time, first, the cylindrical portions 1 of the wheel pieces 10 are opposed to each other with their cylindrical axes aligned. And insert the axial convex portion 3 into the axial concave portion 4 so that the circumferential convex portion 1 at the distal end of the convex portion 3 is inserted.
3 is brought to a position where it fits into the recess 14 in the circumferential direction.

Next, the two wheel pieces 10, 10 are rotated in the circumferential direction with respect to each other, so that the circumferential projection 13 and the circumferential recess 1 are rotated.
4 is engaged.

Finally, air is injected into the tube from the valve of the tire tube, which is viewed through the valve hole 5 of one wheel piece 10.

This causes the tire to inflate, which causes the bead portion of the tire to separate the rims 2 and 2 of the two wheel pieces 10 and 10 and to form the inclined portion 1 of the circumferential projection 13.
The 3 'and the inclined portion 14' of the circumferential recess 14 are axially engaged. The engagement of the inclined portions 13 ′, 14 ′ also prevents the rotation of the two wheel pieces 10, 10 in the circumferential direction, so that the pair of wheel pieces 10 can be connected without being connected by bolts.

Furthermore, in this embodiment, since the pair of wheel pieces 10 have the same shape, only one mold is required, and the manufacturing cost can be reduced.

(Second Embodiment) In this embodiment, for a wheel piece having a cylindrical end face with a lid, a ridge provided on the end face of one wheel is provided with a ridge provided on the end face of one wheel (opposing face). The surface) is provided with a fitting entrance into which it can be inserted, and the protrusion is engaged with the fitting entrance to connect the wheel. The engagement shape between the ridge and the fitting entrance is as follows.

As shown in FIG. 4, the engagement structure according to this embodiment has two ridges 2 on opposite surfaces 20 'of each wheel piece 20.
1 and a fitting entrance 22 into which it is inserted are provided at corresponding positions.

The tip of each of the ridges 21 has a key shape 23, and the fitting inlet 22 is inserted with the ridges 21 so that the end faces 20 'of the cylindrical portions are brought into close contact with each other, so that the respective wheel pieces 20 are moved in the circumferential direction. When the key 23 is turned in the opposite direction to the
It engages the inner surface of 0 'to prevent axial movement of both wheel pieces 20,20. Both wheel pieces 2
Screw holes 25 for preventing rotation are provided in the end faces 20 ', 20' of 0, 20 by post-processing.

The connection of the wheel pieces 20 of this embodiment is as follows.
As shown in FIG. 5, the ridge 21 is fitted into the corresponding inlet 22 and the opposing surface 20 'is brought into close contact with each other. 23
Is engaged with the inner surface of the end surface 20 '. Thus, the axial movement of the two wheel pieces 20, 20 is prevented.

However, since the movement (rotation) in the circumferential direction cannot be prevented by this engagement structure alone, the screw B is inserted into the screw hole 25 for preventing rotation and fastened with the nut N, and the two wheel pieces 20 and Block rotation of 20. The mounting of the tire tube and the like are the same as in the case of the first embodiment, and a description thereof will be omitted here.

Also in this embodiment, the pair of wheel pieces 20 have the same shape except for the screw hole 25 for preventing rotation, and the screw hole 25 can be formed by a simple drilling operation after the wheel body is manufactured by using a die. Therefore, only one mold is required for manufacturing, and the manufacturing cost can be reduced.

(Third Embodiment) Also in this embodiment, when a cylindrical end portion of a wheel piece has a lid-like shape, a protrusion provided on the end surface of the wheel portion is fitted with a fitting entrance through which it can be inserted. The wheel is coupled by engaging the ridges and fitting holes in this embodiment are as follows. In addition, since both wheel pieces of this embodiment have the same shape, the illustration is stopped on one side.

As shown in FIG. 6, the ridges 31 of the wheel piece 30 in this embodiment are provided over a quarter of the periphery of the opposing surface 30 'of the wheel piece 30. Is a key shape 33 toward the center.
A quarter of the periphery adjacent to the left and right of the ridge 31 is a recess 32 into which the ridge 31 can be inserted.
The depression 32 corresponds to the fitting port in the second embodiment.

The periphery of the remaining one-fourth of the opposing surfaces sandwiched between the recesses 32, 32 is an overhanging portion 34 which engages with the key 33 of the ridge 31. The overhanging portion 34 is This corresponds to the inner surface of the end face 20 'in the second embodiment. Also in this embodiment, screw holes 35 for preventing rotation are provided by post-processing at positions corresponding to the end faces 30 ', 30' of both wheel pieces 30, 30, respectively.

As shown in FIG. 7, the method of joining the two wheel pieces 30, 30 is the same as that of the second embodiment, as shown in FIG.
The ridge 31 is fitted into the corresponding recess 32 with the center of 0 'aligned, and one end and the facing surface 30' are imposed. From that state, rotate them in opposite directions in the circumferential direction to
One key 33 is engaged with the overhang portion 34.

Thereafter, a screw B is inserted into the screw hole 35 for rotation prevention and fastened with a nut N, so that the two wheel pieces 30,
Block 30 rotations.

Also in this embodiment, since the pair of wheel pieces 30 have the same shape except for the screw holes 35 for preventing rotation, only one mold is required, and the manufacturing cost can be reduced.

[0029]

As described above, according to the present invention, as the connecting form of the dowel wheel, instead of bolting, the cylindrical portions of the pair of wheel pieces are provided with shapes that engage with each other in the axial direction and the circumferential direction. Since the connection is made by the engagement shape, the assembly is simplified.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment.

FIG. 2 is a side view showing an assembled state of the above.

FIG. 3 is a sectional view taken along line AA in FIG. 2;

FIG. 4 is a perspective view showing a second embodiment.

FIG. 5 is a side view showing the assembled state of the above.

FIG. 6 is a perspective view showing a third embodiment.

FIG. 7 is a side sectional view showing an assembled state of the same.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Cylinder (part) 2 Rim 3 Convex part 4 Concave part 5 Valve hole 10, 20, 30 Wheel piece 13 Convex part 14 Recess 13 ', 14' Inclined surface 21, 31 Ridge 25, 35 Screw hole 32 Depression 23, 33 Key Shape 34 Overhang

Claims (5)

[Claims] 1. A mating wheel that forms one wheel by connecting the other ends of a pair of wheel pieces having a flange-shaped rim standing at one end of a cylinder, and engages each other with each other. An engaging wheel provided with an engaging structure, wherein the engaging structure is engaged to join. 2. As the above-mentioned engagement structure, a protrusion protruding in the axial direction with a predetermined thickness from an outer peripheral surface on a peripheral wall of a cylindrical portion of one wheel piece, and an outer peripheral surface of a peripheral wall of the cylindrical portion of the other wheel piece. The convex portion is insertable, a concave portion having the same depth as the thickness of the convex portion is provided, and the tip of the convex portion and the bottom of the concave portion are formed into a key shape and a concave portion which are respectively engaged in the circumferential direction. After the engagement of the key and the recess in the circumferential direction, injection of air into the tire tube mounted between the two rims causes the two rims to separate in the axial direction. 2. The mating wheel according to claim 1, wherein said mating wheel is engaged with and coupled to said wheel. 3. The combination wheel according to claim 2, wherein each wheel piece has the same shape. 4. The engagement structure, wherein the opposite surface of the cylindrical portion of each wheel piece has a lid, and the projections which are inserted into each other when the two wheels approach each other on the opposite surface. When the ridge and the entrance are provided, the end of the ridge is keyed in the direction along the end face, and when the ridge is inserted into the entrance, the two wheels are imposed and rotated in the opposite direction. To
The key-shaped member comes into contact with the inner surface of the opposing surface to engage in the axial direction, and the end surfaces of both cylinders are provided with a screw hole for inserting a screw for rotation prevention. The dowel wheel according to claim 1. 5. The combination wheel according to claim 4, wherein portions of the respective wheel pieces other than the screw holes for preventing rotation have the same shape.