JP3669771B2 - Multi-piece rim - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multi-piece rim used for off-road wheels, for example, large and super large wheels such as construction vehicles, and more particularly to a fretting-proof structure for the lock ring groove.
[0002]
[Prior art]
FIG. 3 shows the structure of a general (conventional) multi-piece rim, and FIG. 4 shows a partially enlarged view of FIG. 3 and 4, the multi-piece rim includes a gutter band 1 having a lock ring groove 6 and an O ring groove 7, a lock ring 2 having one cut in the circumferential direction attached to the lock ring groove, and a gutter band 1. A bead seat band 3 that is fitted to the outer peripheral side and receives axial force by the lock ring 2, a side ring 3 that is fitted to the outer peripheral side of the bead seat band and receives axial force by the bead seat band 3, and an O-ring groove 7 And an O-ring 5 disposed on the surface.
The lock ring groove 6 includes a bottom portion 6a, a side wall portion 6b, and a bottom portion 6a and an R portion 6c that connects the side wall portion 6b.
[0003]
[Problems to be solved by the invention]
However, when the multi-piece rim is actually mounted and driven on a construction vehicle, a constant surface pressure and relative slip are repeatedly applied to the contact surfaces between the constituent members of the gutter band 1, the lock ring 2, the bead seat band 3 and the side ring 4. The contact surface is roughened and damaged. This is generally called fretting. When fretting occurs, a microcrack is generated from the fretting and further develops into a large crack, which often proceeds to break the member.
In particular, in the portion extending from the outer side R portion 6c of the lock ring groove 6 provided in the gutter band 1 to the side wall portion 6b, the direction A from the lock ring 6 as shown in FIG. Coupled with the deformation of the lock ring groove 6 outward due to the repeated load in the radial direction (inward in the radial direction), the contact surface with the lock ring 2 becomes rough, and micro cracks d due to fretting occur most. It's easy to do. Then, as shown in FIG. 5 (2) starting from the microcrack d, there is a problem that the fatigue crack e progresses, penetrates the gutter band 1, and eventually breaks.
An object of the present invention is to provide a multi-piece rim capable of preventing or suppressing fretting of the lock ring groove 6.
[0004]
[Means for Solving the Problems]
The present invention that achieves the above object is as follows.
(1) A gutter band having a bottom, a lock ring groove and an O-ring groove having R portions at both ends in the rim axial direction of the bottom portion and side wall portions rising from the respective R portions;
A lock ring that is mounted in the lock ring groove and receives axial force by the gutter band, and has one cut in the circumferential direction;
A bead seat band that is fitted to the outer peripheral side of the gutter band and receives axial force by the lock ring;
A side ring that is fitted to the outer peripheral side of the bead seat band and receives an axial force by the bead seat band;
An O-ring disposed in the O-ring groove and sealing between the gutter band and the bead seat band;
In a multi-piece rim consisting of
Of the lock ring groove, a continuous position on the side wall of the outer from the R portion of the rim axially outer, recessed on the side away from the lock ring, the lock ring groove circumferential locking ring cross-sectional shape extending over the direction entire length ing an arc A relief groove is formed , the bottom of the lock ring groove is connected to one end of the arc of the R portion outside the rim axis direction, and the other end of the arc of the R portion outside the rim axis direction is connected to the arc of the lock ring relief groove A multi-piece rim connected to one end and the other end of the arc of the lock ring relief groove connected to the side wall portion on the outer side in the rim axial direction of the lock ring groove .
(2) A boundary between the arc of the R portion outside the rim axis direction and the arc of the lock ring relief groove, and the arc of the lock ring relief groove and the side wall portion outside the rim axis direction of the lock ring groove. The multi-piece rim according to (1) , in which an R is also provided at the boundary between the two .
[0005]
In the multi-piece rim of the above (1) and (2), the lock ring relief groove 9 is provided in a portion of the lock ring groove where the lock ring tip R portion is repeatedly contacted and the load is concentrated. Is concentrated on the side wall portion 6b, relative slip is reduced, generation of microcracks due to fretting is prevented, and damage to the gutter band is prevented.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention. The same parts as those in the conventional configuration are denoted by the same reference numerals as those in FIGS.
As shown in FIGS. 1 and 2, the multi-piece rim of the embodiment of the present invention includes a gutter band 1 having a lock ring groove 6 and an O ring groove 7, and a gutter band 1 mounted in the lock ring 7 groove to provide axial force. The lock ring 2 having one cut in the circumferential direction, and the bead seat band 3 that is fitted to the outer peripheral side of the gutter band 1 and receives the axial force by the lock ring 2 and the outer periphery of the bead seat band 3 And a side ring 4 that receives an axial force by the bead seat band 3, and an O-ring 5 that is disposed in the O-ring groove 7 and seals between the gutter band 1 and the bead seat band 3. The gutter band 1, the bead seat band 3, the side ring 4, and the O-ring 5 are each continuous in the circumferential direction, but the lock ring 2 has one cut in the circumferential direction, and both ends of the ring are separated from each other in the circumferential direction. Facing each other. Up to this point, the conventional multi-piece rim structure shown in FIGS. 3 and 4 is the same.
[0007]
In the embodiment of the present invention, in addition to these conventional structures, among the portions of the lock ring groove 6, the axially outer side wall portion 6 b is subjected to the axially outer R portion 6 c that receives the most repeated load and relative slip from the lock ring 2. A lock ring relief groove 9 that is recessed toward the side away from the lock ring 2 and extends over the entire circumference in the circumferential direction of the lock ring groove 6 is formed in the stubby portion.
From the viewpoint of ease of processing and prevention of contact of the groove surface of the lock ring escape groove 9 with the lock ring 2, the cross section of the lock ring relief groove 9 is preferably an arc shape.
Further, a small R is also applied to the boundary 9b between the lock ring relief groove 9 and the R portion 6c of the lock ring groove 6 and the boundary 9a to the side wall portion 6b, so that stress does not concentrate on the boundaries 9a and 9b. It is desirable to do so.
[0008]
By adopting such a configuration, in the conventional structure, the surface contact load is not applied to the portion extending from the R portion 6c where the repeated load and relative slip are concentrated to the side wall portion 6b, and the contact surface pressure with the lock ring 2 is set to the side wall portion 6b. Can focus on. As a result, generation of microcracks due to fretting is prevented, and progress to fatigue cracks starting from this is prevented.
[0009]
【The invention's effect】
According to the multi-piece rim of claims 1 and 2 , the lock ring relief groove is provided in the portion of the lock ring groove where the repeated load from the lock ring and the relative slip are most concentrated and from the R portion to the side wall portion. Therefore, the contact surface pressure with the lock ring can be concentrated on the side wall portion of the lock ring groove, the occurrence of microcracks due to fretting can be prevented, and the progress to fatigue cracks starting from this can be prevented.
In addition, since the cross-sectional shape of the lock ring relief groove is an arc, it is possible to reliably prevent contact between the surface of the lock ring relief groove and the lock ring, to surely relieve stress concentration, and to further improve the fretting resistance. it can.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a part of a multi-piece rim according to an embodiment of the present invention.
2 is an enlarged cross-sectional view of the vicinity of a lock ring groove of the multi-piece rim of FIG. 1;
FIG. 3 is a cross-sectional view of a portion of a conventional multi-piece rim.
FIG. 4 is an enlarged cross-sectional view of a portion near a lock ring groove of a conventional multi-piece rim.
FIG. 5 is a cross-sectional view of a conventional multi-piece rim showing generation of microcracks due to fretting and progress to fatigue cracks.
[Explanation of symbols]
1 Gutter band 2 Lock ring 3 Bead seat band 4 Side ring 5 O ring 6 Lock ring groove 6b Side wall part 6c R part 7 O ring 9 Lock ring relief groove

Claims (2)

A gutter band having a lock ring groove and an O-ring groove having a bottom portion, R portions at both ends in the rim axial direction of the bottom portion, and side wall portions rising from each R portion;
A lock ring that is mounted in the lock ring groove and receives axial force by the gutter band, and has one cut in the circumferential direction;
A bead seat band that is fitted to the outer peripheral side of the gutter band and receives axial force by the lock ring;
A side ring that is fitted to the outer peripheral side of the bead seat band and receives an axial force by the bead seat band;
An O-ring disposed in the O-ring groove and sealing between the gutter band and the bead seat band;
In a multi-piece rim consisting of
Of the lock ring groove, a continuous position on the side wall of the outer from the R portion of the rim axially outer, recessed on the side away from the lock ring, the lock ring groove circumferential locking ring cross-sectional shape extending over the direction entire length ing an arc A relief groove is formed , the bottom of the lock ring groove is connected to one end of the arc of the R portion outside the rim axis direction, and the other end of the arc of the R portion outside the rim axis direction is connected to the arc of the lock ring relief groove A multi-piece rim connected to one end and the other end of the arc of the lock ring relief groove connected to the side wall portion on the outer side in the rim axial direction of the lock ring groove . A boundary between the arc of the R portion outside the rim axis direction and the arc of the lock ring relief groove, and a boundary between the arc of the lock ring relief groove and the side wall portion of the lock ring groove outside the rim axis direction The multi-piece rim according to claim 1 , further comprising an R.

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