Measuring and testing – Rotor unbalance – Dynamic
Reexamination Certificate
2001-01-10
2002-08-20
Kwok, Helen (Department: 2856)
Measuring and testing
Rotor unbalance
Dynamic
C700S279000
Reexamination Certificate
active
06435027
ABSTRACT:
STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
Not Applicable.
REFERENCE TO MICROFICHE APPENDIX
Not Applicable.
BACKGROUND OF THE INVENTION
This invention relates to wheel balancers and in particular to improved wheel balancers with improved measurement capabilities.
The determination of unbalance in vehicle wheels is carried out by an analysis with reference to phase and amplitude of the mechanical vibrations caused by rotating unbalanced masses in the wheel. The mechanical vibrations are measured as motions, forces, or pressures by means of transducers, which convert the mechanical vibrations to electrical signals. Each signal is the combination of fundamental oscillations caused by imbalance and noise.
Even when a wheel/tire assembly is balanced, non-uniformity in the construction of the tire as well as runout in the rim can cause significant vibration forces as the wheel rolls under vehicle load. Most tire manufacturers inspect their tires on tire uniformity machines and grind rubber off the tires as required to improve rolling characteristics of the tires. Even after this procedure, tires will often produce vibration forces (not related to imbalance) of 20 pounds as they roll on a smooth road. To put this in perspective of balancing, a 0.8 ounce balance weight is required to produce a 20 pound vibration force on a typical wheel traveling at 70 mph.
Many conventional balancers also assume that the wheel/tire assembly which is suitably balanced under an essentially no-load condition will also be suitably balanced when installed on the vehicle and subjected to the substantial load represented by the weight of the vehicle. This assumption is not valid under all conditions. It would be preferable in many circumstances to simulate loaded conditions to improve the results of the balancing operation.
SUMMARY OF THE INVENTION
Among the various objects and features of the present invention is a wheel balancer with improved performance.
Another object is the provision of such a wheel balancer which is capable of simulating loads on the wheel/tire assembly.
Other objects and features will be in part apparent and in part pointed out hereinafter.
In one aspect of the present invention, a wheel balancer includes a shaft adapted for receiving a wheel/tire assembly, the shaft having a longitudinal axis and being rotatable about the axis so as to rotate a wheel/tire assembly removably mounted thereon, a sensor assembly for measuring rotation of the shaft about its longitudinal axis, a vibration sensor assembly for measuring vibration of the wheel/tire assembly as the wheel/tire assembly is rotated, a motor operatively connected to the shaft for rotating the shaft about its longitudinal axis, thereby to rotate the wheel/tire assembly, a load roller for applying a generally radial force to the wheel/tire assembly during rotation of the wheel/tire assembly, a sensor for measuring the lateral force between the load roller and the wheel/tire assembly and a control circuit responsive to the measured vibration of the wheel/tire assembly to determine wheel imbalance, and responsive to the measurement of lateral force to provide information relating to the measured lateral force to the user.
REFERENCES:
patent: 3412615 (1968-11-01), Nedley
patent: 3577780 (1971-05-01), Sperberg
patent: 3630077 (1971-12-01), Boileau
patent: 4055081 (1977-10-01), Honlinger
patent: 4139041 (1979-02-01), Newton
patent: 4244416 (1981-01-01), Newton
patent: 4366707 (1983-01-01), Jarschel
patent: 4458526 (1984-07-01), Doi et al.
patent: 4479382 (1984-10-01), Greenhorn et al.
patent: 4501141 (1985-02-01), Takayanagi et al.
patent: 4702103 (1987-10-01), Wenz
patent: 4815004 (1989-03-01), Beebe
patent: 5103595 (1992-04-01), Dale et al.
patent: 5105595 (1992-04-01), Dale et al.
patent: 5365786 (1994-11-01), Douglas
patent: 5396436 (1995-03-01), Parker et al.
patent: 5448910 (1995-09-01), Yurjevich et al.
patent: 5739428 (1998-04-01), Bux
patent: 39 08 886 (1990-03-01), None
patent: 41 15 726 (1991-11-01), None
patent: PCT/US87/03141 (1987-11-01), None
patent: WO 90/03561 (1990-04-01), None
Brochure: Tire Matching Brand; Copyright 1980 Ride Control Systems, Inc.
Colarelli, III Nicholas J.
Douglas Michael W.
Parker Paul Daniel
Hunter Engineering Company
Kwok Helen
Thompson & Coburn LLP
Upchurch Gregory E.
LandOfFree
Wheel balancer with lateral force variation measurement does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Wheel balancer with lateral force variation measurement, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Wheel balancer with lateral force variation measurement will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2879188