JPH07132701A - Multichip rim - Google Patents

Abstract

PURPOSE:To suppress fretting fatigue by tilting a contact surface of a side ring with a back flange part and/or bead seat band relating to a surface orthogonal to the rim axial center, so as to reduce relatively slipping the back flange part and the bead seat band. CONSTITUTION:A contact surface 18 between a back flange part 12 and a side ring 14a is tilted by an angle theta so as to tilt in a rim axial direction outside toward a radial direction outside relating to a surface orthogonal to the rim axial center. Similarly, a contact surface 19 between a bead seat band 15 and a side ring 14b is tilted by an angle theta so as to tilt in the rim axial direction outside toward the radial direction outside relating to a surface orthogonal to the rim axial center. When force is applied to a tire, force is applied to the side rings 14a, 14b, and the force is transmitted to also the back flange part 12 and the bead seat band 15. Here, slipping to a radial direction inside of the side rings 14a, 14b is impeded by the back flange part 12 and the bead seat band 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-piece rim composed of a plurality of pieces for use in a construction vehicle or the like.

[0002]

2. Description of the Related Art Since a large construction vehicle has a high tire rigidity, the wheel rim on which the tire is mounted is a multi-piece rim to facilitate the mounting and dismounting of the tire. As shown in FIG. 6, a conventional multi-piece rim has a cylindrical rim base 1 having a back flange portion 2 and a gutter band portion 3, a bead seat band 5 mounted on the outer periphery of the gutter band portion, and an axial protrusion of the bead seat band 5. Lock ring 6 to prevent
It is composed of side rings 4a, 4b which are movable in the radial direction but are axially supported by a back flange portion 2 and a bead seat band 5. The tire 7 is mounted on the inner side in the axial direction of both side rings 4a, 4b.

As shown in FIGS. 4 and 5, the contact surface 8 between the back flange portion 2 and the side ring 4a and the contact surface 9 between the bead seat band 5 and the side ring 4b are orthogonal to the rim axis. There is. Side rings 4a, 4b
A radial gap c is provided between the rim 1 and the bead seat band 5 on the inner diameter side of the rim 1 in order to facilitate the fitting of the side rings 4a, 4b.

[0004]

However, in the conventional multi-piece rim, there is a clearance c on the inner diameter side of the side rings 4a and 4b, and due to the difference in rigidity between the parts, the parts are actually operated with each other. A slight relative slip occurs. Especially in the case of a day mountable rim where the rim is directly attached to the hub by a clamp, the side ring 4a,
Since radial and circumferential relative slips repeatedly occur between 4b and the rim and the bead seat band, cracks due to fretting fatigue easily occur on the contact surfaces of both, and the durability of the rim is improved when cracks occur. There was a problem of lowering.

It is an object of the present invention to provide a multi-piece rim capable of suppressing fretting fatigue by reducing relative slippage between a side ring, a back flange portion and a bead seat band.

[0006]

A multi-piece rim according to the present invention for achieving the above object comprises: (1) In a multi-piece rim consisting of a rim base having a back flange portion and a gutter band portion, a bead seat band, a lock ring, and a side ring, the contact surface between the back flange portion and the side ring is made a surface orthogonal to the rim axis. On the other hand, a multi-piece rim that is inclined so as to incline radially outward toward the rim axially outward. (2) The contact surface between the bead seat band and the side ring is also inclined with respect to the surface orthogonal to the rim axis center so as to incline outward in the radial direction and outward in the rim axial direction. rim.

[0007]

In the multi-piece rim of the present invention, since the contact surface between the side ring and the back flange portion and / or the bead seat band is inclined with respect to the surface orthogonal to the rim axis, both of the radial direction Relative movement (slip) can be prevented,
In addition, slippage in the circumferential direction can also be reduced. Thereby, fretting fatigue due to slippage between members can be suppressed.

[0008]

1 through 3 show a multi-piece rim 10 of the preferred embodiment of the present invention. As shown in FIG. 3, the multi-piece rim 10
The rim base 11 having the back flange portion 12 and the gutter band portion 13, the bead seat band 15, and the lock ring 16 are the same as those described for the conventional multi-piece rim of FIG.
Consists of. The rim base 11 may be an integrally molded product or may be welded at the center. An O-ring 20 is interposed between the bead seat band 15 and the gutter band portion 13 to seal the inside of the tire 17. The lock ring 16 has one cut in the circumferential direction, and the side ring 14
b, after the bead seat band 15 is axially inserted on the outer peripheral side of the gutter band portion 13, it is engaged with the groove of the gutter band portion 13. The lock ring 16 prevents the bead seat band 15 from protruding outward in the rim axial direction when the tire pressure is applied to the bead seat band 15 via the side ring 14b. The step portions 21 and 22 on the outer peripheral portion of the back flange portion 12 and the bead seat band 15 are the tire 1
It is a step portion for inserting a jig when 7 is removed. A radial clearance c is provided on the inner diameter side of each of the side rings 14a and 14b in order to facilitate fitting, as in the conventional case.

As shown in the enlarged view of FIG. 1, the contact surface 18 between the back flange portion 12 and the side ring 14a extends radially outward with respect to the surface orthogonal to the rim axis and extends outward in the rim axial direction. It is inclined by an angle θ so that it is inclined.
This inclination angle θ is set in the range of 1 ° to 10 °. 1 °
The grounds for numerical values of -10 ° are as follows. Ie 1 °
With respect to the above, if θ is less than 1 °, a remarkable relative slip prevention effect cannot be obtained as compared with the conventional structure. Regarding 10 °, when θ exceeds 10 °, the difference in the contact surface angle is large due to the difference in rigidity between the back flange 12 and the side ring 14a, especially when a lateral load is applied to the tire. Therefore, the contact between the two components is changed from the surface contact to the line contact, which causes a relative slip in the circumferential direction between the two components.

Similarly, as shown enlarged in FIG. 2, the contact surface 1 between the bead seat band 15 and the side ring 14b.
9 is inclined by an angle θ with respect to a plane orthogonal to the rim axis center so as to incline outward in the radial direction toward the outside in the radial direction. This inclination angle θ is also set in the range of 1 ° to 10 °. The numerical value of 1 ° to 10 ° is based on 1 ° of the inclined surface 18 of the side ring 14a and the back flange portion 12 described above.
It is the same as the numerical basis of 10 °.

Next, the operation will be described. The side ring 14a, 1 in which force is applied to the tire 17 and is in contact with it
The force is applied to 4b, and the force is also transmitted to the back flange portion 12 and the bead seat band 15. At this time, due to the difference in the rigidity of each component and the radial clearance c provided on the inner diameter side of the side rings 14a and 14b, relative slip is likely to occur between the components.

However, in the multi-piece rim of the present invention, the contact surface 18 between the side ring 14a and the back flange portion 12 and / or the contact surface 19 between the side ring 14b and the bead seat band 15 serves as the rim axis. Since the side rings 14a and 14b are inclined from the planes orthogonal to each other, slippage of the side rings 14a and 14b inward in the radial direction is prevented by the back flange portion 12 and the bead seat band 15, and regardless of the radial clearance c, the rim shaft core and It will not slip in the orthogonal direction.
Further, the load in the direction orthogonal to the rim axis due to the ground contact pressure of the tire is applied to the inclined contact surfaces 18 and 19, so that the contact surface 18 and
When it is decomposed into a load along the direction 19 and a load perpendicular to the contact surfaces 18 and 19, the load perpendicular to the contact surfaces 18 and 19 becomes a large component force, generates a large frictional force, and is only the tire internal pressure. Increase the friction force of. Due to this increase in frictional force, the side rings 14a and 14b are less likely to slip relative to the back flange portion 12 and the bead seat band 15 also in the circumferential direction. In this way, the side rings 14a and 14b are prevented from causing relative slippage both in the direction perpendicular to the rim axis and in the circumferential direction.

[0013]

According to the invention of claim 1, since the contact surface between the back flange portion and the side ring is inclined from the surface orthogonal to the rim axis, it is possible to prevent the side ring from slipping with respect to the back flange portion. The occurrence of fretting cracks on the contact surface can be prevented. According to the invention of claim 2, since the contact surface between the bead seat band and the side ring is also inclined from the surface orthogonal to the rim axis, slippage of the side ring with respect to the bead seat band can be prevented, and fretting of the contact surface is achieved. The generation of cracks can be prevented.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view of one side ring of a multi-piece rim and its vicinity according to an embodiment of the present invention.

FIG. 2 is an enlarged sectional view of the other side ring of the multi-piece rim of FIG. 1 and its vicinity.

3 is an overall sectional view of a rim portion of the multi-piece rim of FIG.

FIG. 4 is an enlarged cross-sectional view of one side ring of a conventional multi-piece rim and its vicinity.

5 is an enlarged cross-sectional view of the other side ring of the multi-piece rim of FIG. 4 and its vicinity.

6 is an overall cross-sectional view of a rim portion of the multi-piece rim of FIG.

[Explanation of symbols]

 11 rim base 12 back flange part 13 gutter band part 14a side ring 14b side ring 15 bead seat band 16 lock ring 17 tire 18 contact surface 19 contact surface

Claims (2)

[Claims] 1. A rim base having a back flange portion and a gutter band portion, a bead seat band, a lock ring,
In a multi-piece rim consisting of a side ring and a side ring, the contact surface between the back flange portion and the side ring is inclined so as to incline outward in the radial direction toward the outside in the radial direction with respect to the surface orthogonal to the rim axis. A multi-piece rim characterized by that. 2. The contact surface between the bead seat band and the side ring is also inclined so as to incline outward in the radial direction toward the outside in the radial direction with respect to the surface orthogonal to the rim axis. Multi-piece rim.