JPH0455101A - Road wheel - Google Patents

Abstract

PURPOSE:To closely fix a bead portion of a tire to a rim and to improve the uniformity of an assembly of a tire and a road wheel by providing projections on a rim base portion of a rim, which are capable of projecting and recessing from the outer surface thereof in the radial direction. CONSTITUTION:Plural recess portions 20 are disposed in the peripheral direction of a rim base portion 13a, and projections 21 are inserted therein in such a manner as to project and recess. An elastic seal member 22 is engaged with a stepped portion 20a and the projection 21 to seal the interior of the recess portion 20 and the inside of a tire 15. A communicating hole 26 for communicating the interior of a valve 25 with the interior of the recess portion 20 is provided in the interior of the rim 13. At the time of assembling the tire 15 to the rim 13, the projection 21 is sunk in the recess portion 20. The bead portion 15a is first placed near a drop center portion 13c, and the bead portion 15a is smoothly moved on the rim base portion 13a having no projection or the like by filling up the interior of the tire 15 with air so as to be closely assembled to the rim 13. After that, air is charged from a valve 25 through the communicating hole 26 into the recess portion 20 by high air pressure. The projection 21 is projected and fixed to the rim base portion 13a.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a road wheel, for example, a road wheel in which a tire is assembled to a rim and mounted on a vehicle.

(Prior Art) As a conventional road wheel, there is one shown in FIG. 6, for example. In FIG. 6, 1 is a road wheel, and the road wheel 1 has a cylindrical rim 3 fixed to the periphery of a disk 2. rim 3
The bead portion 5a of the tire 5 is attached to the rim base portion 3a of the road wheel 1 with the tire attached to the rim.
is installed on the vehicle.

The rim base portion 3a of the rim 3 of the road wheel 1 includes a protrusion 6 that protrudes radially outward from the outer surface of the rim base portion 3 over the entire circumference at a predetermined distance from the rim flange portion 3b inward in the central axis direction of the rim 3; A so-called hump is provided.

This protrusion 6 ensures that even if a lateral force is applied to the tire 5 while the road wheel 1 is mounted on a vehicle and the vehicle is running, the tire 5 will not move toward the rim.
This is to prevent the internal pressure of the tire 5 from escaping when it comes off the rim base portion 3a.

(Problems to be Solved by the Invention) However, in such a conventional road wheel, since the protrusion 6 is provided on the rim base portion 3a of the rim 3, when the tire 5 is assembled to the rim 3, As shown in FIG. 6, as the tire 5 is filled with air, the bead portion 5a moves from the position of the tire 5A inside the center axis of the rim 3 or from the drop center of the rim 3. It is assembled by moving from the position where it has fallen into the portion 3C to the rim base portion 3a over the protrusion 6 until it comes into contact with the rim flange portion 3b. At this time, the bead portion 5 of the tire 5
If the toe 7 of a remains on the protrusion 6, the rim base part 3
The adhesion between a and the bead portion 5a is poor, and a space remains in a part, which may result in poor rim assembly of the tire 5. For this reason, there is a problem in that the unibomity performance of the assembly in which the tire 5 is assembled to the road wheel 1 on a rim deteriorates.

The present invention has been made by focusing on such conventional problems, and by providing a protrusion that can protrude and retract from the outer surface of the rim base of the rim of a road wheel and a retractable means that makes the protrusion retract and protrude in a radial direction, When assembling the rim, the protrusions are pushed inward from the outer surface of the rim base, and after the rim is assembled, the protrusions are made to protrude outward from the outer surface, allowing the bead of the tire to be tightly fixed to the rim. An object of the present invention is to provide a road wheel that can improve the uniformity of the tire and road wheel assembly.

(Means for Solving the Problems) The road wheel according to the present invention is a road wheel to be mounted on a vehicle, in which the bead of the tire is assembled to the rim base of a cylindrical rim. Near the toe of the bead portion, on the inner side in the central axis direction of the rim base portion, a plurality of protrusions that can protrude and retract from the outer surface of the rim base portion in a radial direction; and a retracting means for retracting the protrusion from the outer surface when the tire is assembled to the rim. It is characterized in that the bead portion protrudes radially outward and is fixed to the rim base portion.

(Function) The road wheel of the present invention is provided with a protrusion that can protrude and retract from the outer surface in a radial direction on the rim base portion of the rim, and a protrusion means that makes the protrusion protrude and retract.When assembling the tire to the rim, the protrusion is The bead of the tire moves from the inside of the rim to the rim flange by the air pressure filling the tire, but the bead rests almost on the bead base in close contact with the bead base. It moves smoothly and adheres to the bead base. Therefore, it is possible to prevent the bead portion from remaining on the protrusion and forming a space between the bead portion and the rim base portion, as in the conventional case.

1, after assembling the tire to the rim, the protrusion J, -
- Since the base portion protrudes radially outward, the movement of the bead portion of the tire is suppressed by the projection and is firmly fixed to the rim base portion.

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 3 are diagrams showing a first embodiment of a road wheel according to the present invention, which is applied to a road wheel for a passenger car.

First, the configuration will be explained. In FIG. 1, 11 is a road wheel, and the road wheel 11 has a disc-shaped disc 12 and a disc 12 around the disc 12.
and a cylindrical rim 13 fixed so as to have the same center axis. The rim 13 has a rim base portion 13a on the outer periphery on both sides in the direction of the center axis;
A rim flange portion 13b extending radially outward and continuing to a.
and a rim base portion 13 at the center of the rim 13 in the direction of the central axis.
It has a drop center portion 13C having an outer diameter smaller than a.

The bead portions 15a of a pneumatic tire (hereinafter simply referred to as a tire) 15 of a predetermined size can be assembled to the pair of rim base portions 13a of the rim 13 in close contact with the rim base portion 13a and the rim flange portion 3b, respectively. The rim base part 13a has a rim base part 13a on the inner side in the direction of the central axis of the rim base part 13a, near the toe 17 of the bead part 15a of the tire 15 to be assembled to the rim base part 13a.
A plurality of recesses 20 each having a circular cross section are arranged in a circumferential direction.

As shown in FIG. 3, the recess 20
The step 20a is formed such that the diameter on the outer surface 13d side is larger than the diameter D2 on the inner side.

Inside the four parts 20, there is a cylindrical projection 21 shown in FIG. 2(a).
is inserted from the outer surface 13d of the rim base portion 13a so as to be able to protrude and retract in the radial direction of the rim 13. A flange 21a is provided at the base of the protrusion 21, and the flange 21a is connected to the recess 2.
An annular elastic seal member 22 is placed on the step 20a on the outer surface side of the
The protrusions 21 are engaged with each other through the rotation of the tire 5 to prevent the protrusions 21 from flying out due to the centrifugal force caused by the rotation of the tire 5. The elastic seal member 22 engages with the step 20a of the recess 20 and the protrusion 21,
The inside of the recess 20 and the inside of the tire 5 are sealed. 23
is a plug member, and the plug member 23 is for inserting the protrusion 21 into the recess 20, and is screwed onto the rim base portion 13a.

In FIG. 1, 25 is a valve, and the valve 25 is a one-way valve that can blow air only from outside the valve 25 into the inside of the valve. , are removably provided on the rim 13. A communication hole 26 is provided inside the rim 13 to communicate between the inside of the valve 25 and the inside of the recess 20.
0, the protrusion 21 is moved to the rim base part 13.
The protrusion 21 can be protruded radially outward from the outer surface 13d of the rim 13a (indicated by a chain line 21A in FIG. It is recessable radially inwardly into the recess. Recess 20, elastic seal member 22, valve 25
The communicating hole 26 constitutes a projecting/retracting means 27.

Next, the effect will be explained.

The road wheel 11 according to the present invention has a rim base portion 13
Since the protrusion 21 and the retractable means 27 that can retract and retract in the radial direction from the outer surface 13d of the tire 5 are provided, the tire 5 can be attached to the rim 1.
3, remove the air pressure in the recess 20 and the communication hole 26, remove the valve 25 from the rim 13 if necessary, and insert the protrusion 21 into the recess 20 of the rim base 13a.
The tire 15 is recessed inward in the radial direction, and the tire 15 is assembled to the rim 3. First, the bead portion 15a of the tire 15 is
By filling air into the tire 15 through a tire valve (not shown) located inside the center axis of the rim base portion 13a of the rim 13 or near the drop center portion 13c, the rim base portion 13a is moved over the rim flange portion. Move to the 13b side. The protrusion 21 is located at the rim base portion 13a.
Since the bead portion 15a of the tire 15 is recessed inside the recess 20 of the rim base portion 13, the bead portion 15a of the tire 15 is smooth and has no protrusions or the like.
The tire 15 moves smoothly on the rim flange portion 13b side while being in close contact with the rim base portion 13a on the rim flange portion 13b, and the tire 15 can be assembled into the rim 13 while being in close contact with the rim base portion 13a.

After the tire 15 is assembled to the rim 13, air pressure higher than the air pressure inside the tire 15 causes the valve 25 to open through the communication hole 2.
Air is filled into the recess 20 through the recess 6 . Due to the air pressure in the recess 20, the projection 21 projects radially outward from the outer surface 13d of the rim base portion 13a, as shown in FIG. 3, and fixes the bead portion 15a of the tire 15 to the rim base portion 13a. Therefore, even if a lateral force is applied to the tire while the vehicle is running, the tire 15 will not come off the rim base portion 13a, and the internal pressure of the tire 15 can be prevented from escaping.

Further, the bead portion 15a of the tire 15 is connected to the rim base portion 13.
a smoothly moves to the rim flange part 13b and is fixed in close contact with the rim base part 13a, so the unibomity of the assembly of the tire 15 and the road wheel 11 is good. uniformity defects can be prevented.

In the above-described embodiment, the protrusion 21 is cylindrical. However, in the present invention, the protrusion 21 is not limited to the cylindrical shape;
), a protrusion 28 formed of an arcuate rectangular parallelepiped along the circumferential direction of the rim base portion 13a and a protrusion 29 formed of an arcuate rectangular parallelepiped and having a roundness 29a may be used.

Next, a second embodiment of the present invention will be described.

FIG. 4 is a diagram showing a second embodiment of the road wheel according to the present invention, and the same components as in the first embodiment are given the same reference numerals.

In the road wheel 31 of the second embodiment, the four parts 20
This is a case where a compression spring 33 is provided that presses the flange 21a of the inner protrusion 21 radially outward, and the protrusion 21 is attached to the compression spring 33.
3, the rim base portion 13a is always urged to protrude radially outward from the outer surface 13d of the rim base portion 13a.

The protrusion 21 is retracted into the four parts 20 by applying negative pressure to the recess 20 from a valve (not shown), and then the tire 15 is assembled to the rim 13.

Next, a third embodiment of the present invention will be described.

FIG. 5 is a diagram showing a third embodiment of the road wheel according to the present invention, and the same components as in the first embodiment are given the same reference numerals.

In the road wheel 41 of the third embodiment, the recess 43
This is the case when the disc 12 is provided from the rim base portion 13a of the rim 13 into the disc 12. The length of the communication hole 45 in the rim 13 is shortened, making it easier to create the recess 43 and the communication hole 45, and facilitating maintenance and inspection.

(Effects) As explained above, according to the present invention, when assembling the rim, by providing the rim base portion of the rim of a road wheel with a protrusion that can protrude and retract from the outer surface in a radial direction, and a protrusion and retraction means that makes the protrusion appear and retract. After the protrusion is recessed inward from the outer surface of the rim base part and the rim is assembled, the protrusion is made to protrude outward from the outer surface so that the bead part of the tire can be fixed in close contact with the rim. Therefore, the uniformity of the tire and road wheel assembly can be improved.

[Brief explanation of drawings]

1 to 3 are diagrams showing a first embodiment of the I code wheel according to the present invention.
Figure (a) is a perspective view of the projection, Figures 2 (b) and (C
) is a perspective view of another protrusion, and FIG. 3 is an enlarged sectional view of the main part thereof. FIG. 4 shows the second road wheel according to the present invention.
It is a partial sectional view showing an example. FIG. 5 is a partial sectional view showing a third embodiment of the road wheel according to the present invention. FIG. 6 is a partially schematic sectional view of a conventional road wheel. 11.31.41...road wheel, 13.
... Rim, 13a ... Rim base portion, 15 ... Tire, F ... Toe, 20.43 ... Concave part (projection means), 21.28
．． 29...Protrusion, 22...Elastic sealing member (protrusion/retraction means), 25.
...Valve (appearance means), 26.45...
・Communication hole (exit means).

Claims (1)

[Claims] In a road wheel in which a bead portion of a tire is assembled to a rim base portion of a cylindrical rim and mounted on a vehicle, near the toe of the bead portion of the tire assembled to the rim base portion, on the inside in the central axis direction of the rim base portion, A tire is assembled to a rim, including a plurality of protrusions that can protrude and retract from the outer surface of the rim base part in a radial direction, and a protrusion and retraction means that makes the protrusions protrude and retract from the outer surface of the rim base part in a radial direction outward and inward. In this case, the protrusion is recessed into the rim base from the outer surface, and after the tire is assembled to the rim, the protrusion is made to protrude radially outward from the outer surface, and the bead is fixed to the rim base. A road wheel characterized by: