Resilient tires and wheels – Tires – resilient – Pneumatic tire or inner tube
Patent
1995-08-10
1997-11-25
Ball, Michael W.
Resilient tires and wheels
Tires, resilient
Pneumatic tire or inner tube
152158, B60C 1706
Patent
active
056907621
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND AND SUMMARY OF THE INVENTION
The present invention relates to an emergency ring for a vehicle wheel, and more particularly, to an emergency ring which is composed of a one-piece rim with a rim bed and a pneumatic tire, comprising a one-piece annular elastic body having annular reinforcement inlays and an outside on which, in an emergency, an inside of the pneumatic tire remote from tire tread comes to rest, an outer side face, an inner side face, and an inside oriented toward the rim bed.
U.S. Pat. No. 3,814,158 discloses an emergency ring which, on its inside in the middle, has an encompassing annular recess. This recess divides the known emergency ring into two halves on the side toward the rim bed. Each half rests on the pneumatic tire in the region of the tire bead.
Because the emergency ring rests on both sides on the tire beads, it must be resilient enough in the middle region as a result of the recess to enable mounting of the pneumatic tire. The softness of the emergency ring required for mounting has a disadvantageous effect upon rotation of the vehicle wheel, especially so at high wheel speeds, as a result of the emergency ring becoming unstable and expanding in the radial direction. The reinforcement inlays, which for reasons of mountability are located relatively far to the outside, are unable to prevent expansion of the farther inward elastic material of the emergency ring.
A danger therefore exists that the known emergency ring in normal operation (that is, with adequate operating pressure in the pneumatic tire) will move relative to the rim, causing wear and an increase in temperature and in particular also producing an imbalance. In emergency operation, the emergency ring is too unstable to transmit the tire contact force purposefully to the region of the tire beads and thereby keeping the pneumatic tire on the rim. Instead, the two annular halves of the emergency ring creep toward the middle in the direction of the recess and fix the tire beads only inadequately.
An emergency ring that is supported on the rim bed is described in DE-OS 27 22 885, wherein the emergency ring simultaneously rests nonpositively in the lower region of the side walls of the pneumatic tire. As a result, the initial stress in the radial direction that can be brought to bear is sharply limited, because the combined emergency ring and pneumatic tire must remain mountable. Reinforcement inlays to prevent expansion of the emergency ring under centrifugal force are entirely lacking.
The protrusion from the emergency ring provides no security against axial displacement, because the protrusion in the mounted state of the emergency ring is supported on the shallow rim bed.
The emergency ring shown in DE 84 32 017 U1 is also supported both on the pneumatic tire and on the rim bed. The relatively thin-walled shape of this emergency ring, while it does facilitate mounting, is capable neither of bringing an adequate radial initial stress to bear, nor of securely transmitting the wheel load in an emergency.
The emergency ring described in DE 33 41 969 A1 is firmly joined to the rim bed, for instance by welding or screw fastening. Because of its lack of elasticity (steel emergency ring) and the rigid disposition on the vehicle wheel, its rigid construction requires a correspondingly large spacing from the wheel flanges of the wheel on both sides, to assure mountability of the pneumatic tire.
U.S. Pat. No. 3,872,907 also shows in FIG. 10 a one-piece emergency ring which extends closely spaced apart from the adjacent side wall regions of the pneumatic tire. This emergency ring is, however, designed for rims that are in two or more parts and is not strictly supported on the rim bed, but is instead secured to the rim. It also contemplates split emergency rings for one-piece rims (FIGS. 11 and 13), with the ring halves being held in their position via tension arms actuatable by cable pulls.
It is, therefore, an object of the present invention to provide an emergency ring such that, in addition to easy mountability, it is
REFERENCES:
patent: 3814158 (1974-06-01), Ryder
patent: 3872907 (1975-03-01), Curtiss, Jr., et al.
patent: 4212338 (1980-07-01), Tiemann
patent: 4295509 (1981-10-01), Stein
patent: 4573509 (1986-03-01), Smith et al.
Binder Horst
Bock Andreas
Kunz Martin
Ball Michael W.
Bayerische Moteren Werke Aktiengesellschaft
Lorin Francis J.
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