US3762225A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for balancing motor vehicle wheels
Assignee: Gebr Hofmann GmbH and Co KG Maschinenfabrik
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Filing: 1971-10-18
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Granted: 1973-10-02
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Expires: 1991-10-18
Abstract
Abstract An apparatus for balancing one or a pair of motor vehicle wheels while on the axle whereby the wheel is supported on a stand having a transducer mounted therein for producing a voltage signal indicating the magnitude and angular imbalance location of the wheel. The voltage signal is applied to a quadratic circuit having a frequency characteristic which falls quadratically with the speed of wheel rotation and a 90* phase lead of the output relative to the input voltage so that the output of the quadratic circuit is substantially independent of the speed of wheel rotation. The output of the quadratic circuit is applied to a measuring device which indicates the magnitude of the imbalance and to a circuit which causes stroboscopic flashes to be produced while the imbalance is at dead center bottom.
Inventors
- 👤 R Mueller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 17:20
CPC Classifications
G; G01; G01M; G01M1/00; G01M1/14; G01M1/16; G01M1/28
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
148 words
Apparatus for balancing a motor vehicle wheel on its axle comprising: an axle stand, a transducer mounted on said stand for producing a voltage signal indicating the magnitude and angular position of an imbalance when said wheel is supported on said stand and is in rotation, a quadratic circuit connected to said transducer for receiving sAid indicating signal and having a frequency characteristic with a magnitude which falls quadratically with the speed of wheel rotation and a 90* phase lead of the output relative to the input voltage so that the output of said quadratic circuit is substantially independent of the speed of wheel rotation, means connected to the output of said quadratic circuit for providing an indication of the magnitude of imbalance, and means connected to the output of said quadratic circuit for producing stroboscopic light flashes when a wheel is located at a given angular position.
Claim 2
Dependent Claim
148 words
Apparatus for balancing a motor vehicle wheel on its axle comprising: an axle stand, a transducer mounted on said stand for producing a voltage signal indicating the magnitude and angular position of an imbalance when said wheel is supported on said stand and is in rotation, a quadratic circuit connected to said transducer for receiving sAid indicating signal and having a frequency characteristic with a magnitude which falls quadratically with the speed of wheel rotation and a 90* phase lead of the output relative to the input voltage so that the output of said quadratic circuit is substantially independent of the speed of wheel rotation, means connected to the output of said quadratic circuit for providing an indication of the magnitude of imbalance, and means connected to the output of said quadratic circuit for producing stroboscopic light flashes when a wheel is located at a given angular position.
Claim 3
Dependent Claim
41 words
Apparatus as in claim 1 wherein said light flash producing means includes a trigger circuit connected to said quadratic network, a differentiating circuit for differentiating the output of said trigger circuit and a stroboscopic flash means connected to said differentiating circuit.
Claim 4
Dependent Claim
12 words
Apparatus as in claim 1 wherein said transducer is a force-measuring cell.
Claim 5
Dependent Claim
13 words
Apparatus according to claim 2 wherein said trigger circuit is a Schmitt trigger.
Claim 6
Dependent Claim
66 words
Apparatus according to claim 2 further including connected between said transducer and said quadratic circuit an amplifier circuit for impedance matching to the high impedance of said transducer and a potentiometer, the total amplification of the apparatus being controllable by means of the potentiometer such that the magnitude of the unbalance is indicated at the measuring instrument in the desired units such as grams or ounces.
Claim 7
Dependent Claim
63 words
Apparatus as in claim 2 wherein said trigger circuit which is connected to the output of said quadratic circuit and which responds to the passage through zero of the sine voltage at the output of said quadratic circuit is connected by way of said differentiating means to a thyristor whose positive pulses fire an electronic flash stroboscope by way of a firing coil.
Claim 8
Dependent Claim
113 words
Apparatus as in claim 1 wherein said stand is adapted for supporting two wheels on an axle and further including: a second transducer mounted on said stand for producing a second voltage signal indicating the magnitude and angular position of an imbalance of the second wheel when said wheels are supported on said stand and is in rotation, a second quadratic circuit connected to said second transducer for receiving said second indicating signal so that the output of said second quadratic circuit is independent of the speed of wheel rotation, and means for determining the magnitude and angular position of imbalances in said second wheel from the output of said second quadratic circuit.
Claim 9
Dependent Claim
44 words
Apparatus as in claim 7 further including means for receiving said outputs of said first and second quadratic circuits and producing first and second signals compensated for first wheel vibrations detected by said second transducer and second wheel vibrations detected by said first transducer.
Claim 10
Dependent Claim
31 words
Apparatus according to claim 7 wherein said transducers are force-measuring cells, and transducers are each connected to the respective one of said two quadratic circuits by way of a respective amplifier.
Claim 11
Dependent Claim
68 words
Apparatus as in claim 1, further including, to determine dynamic unbalance, a further electro-mechanical transducer for measuring travel comprising a force-measuring element with a spring in front thereof, the spring having one end bearing against the force-measuring element in the unbalance measuring operation and having its other end bearing against a non-rotatable part of the axle in the vicinity of the wheel mounting, such as the brake drum.
References Cited (Backward Citations)
US2731834A
Cited
US3452603A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |