US3847012A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling and measuring tire forces
Assignee: Individual
•
Filing: 1971-11-23
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Granted: 1974-11-12
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Expires: 1991-11-23
Abstract
Abstract A method of measuring the energy transmitted between the tread surface of a rotating tire and a moving surface which supports the tire. The power output of the prime mover which rotates the tire may be determined from the measured revolutions per minute (rpm) and manifold pressure (M.P.) or from the fuel flow of an internal combustion engine. This power output is correlated with the actual torque or force exerted by the tire tread surface against a moving surface whereupon the effects of the drivetrain, differential, wheel bearings, and tire flexing losses are eliminated from the observed indicated power output of the engine. The correlation is attained by placing the vehicle upon a force measuring device which has previously been calibrated to measure power expanded upon the device in any suitable power unit, such as horsepower. A dictionary of stored data relating engine performance, such as the observed rpm and manifold pressure, with the actual torque or power exerted by the surface of the tire is provided whereby test data in the form of power output may be subsequently obtained which directly relates the force exerted by the tread surface of the tire to the indicated power delivered by the engine in propelling a vehicle down a highway. This expedient therefore changes the vehicle into a mobile dynamometer, since the dictionary of stored terms can be compared to the indicated engine power output under any operating conditions to enable rapid determination of the actual torque or developed hp which is extended in overcoming the various forces which resist movement of the vehicle.
Inventors
- 👤 L Sperberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 00:16
CPC Classifications
G; G01; G01L; G01L3/00; G01L3/24; G01L3/245; G01M; G01M17/00; G01M17/007; G01M17/02; G01M17/022
Claims Analysis
Total Claims: 41
Claim 1
Independent Claim
212 words
A method of measuring the work performed by a tire tread surface whicH is held against a moving surface while a portion of the tread compound is abraded away, comprising the steps of: 1. measuring the work performed by the tread surface of the tire as a function of vehicle power plant power output as the power plant causes the tire to rotate against a moving surface which exerts a controlled resisting force against the tire; 2. carrying out step (1) at various rotational velocities of the tire for each of a plurality of controlled resistive forces; 3. recording the vehicle power plant outputs with the work performed against the moving surface at the various velocities and controlled resistive forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the vehicle power output; 4. wearing away a portion of the tread surface by rotating the tire by means of said vehicle at a velocity corresponding to one of said various velocities and under a resistive force corresponding to one of said plurality of resistive forces, while recording the power plant output of the vehicle; 5. to thereby determine the work performed by said portion of the tire tread surface during step (4).
Claim 2
Independent Claim
212 words
A method of measuring the work performed by a tire tread surface whicH is held against a moving surface while a portion of the tread compound is abraded away, comprising the steps of: 1. measuring the work performed by the tread surface of the tire as a function of vehicle power plant power output as the power plant causes the tire to rotate against a moving surface which exerts a controlled resisting force against the tire; 2. carrying out step (1) at various rotational velocities of the tire for each of a plurality of controlled resistive forces; 3. recording the vehicle power plant outputs with the work performed against the moving surface at the various velocities and controlled resistive forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the vehicle power output; 4. wearing away a portion of the tread surface by rotating the tire by means of said vehicle at a velocity corresponding to one of said various velocities and under a resistive force corresponding to one of said plurality of resistive forces, while recording the power plant output of the vehicle; 5. to thereby determine the work performed by said portion of the tire tread surface during step (4).
Claim 3
Dependent Claim
20 words
carrying out step (1) at various rotational velocities of the tire for each of a plurality of controlled resistive forces;
Claim 4
Dependent Claim
20 words
carrying out step (1) at various rotational velocities of the tire for each of a plurality of controlled resistive forces;
Claim 5
Dependent Claim
23 words
exerting a controlled resisting force of different magnitudes into the beads of the tire while the tire is rotated at various rotational velocities;
Claim 6
Dependent Claim
23 words
exerting a controlled resisting force of different magnitudes into the beads of the tire while the tire is rotated at various rotational velocities;
Claim 7
Dependent Claim
18 words
Method of measuring the energy required to wear away an outer portion of a tire tread surface comprising:
Claim 8
Dependent Claim
18 words
Method of measuring the energy required to wear away an outer portion of a tire tread surface comprising:
Claim 9
Dependent Claim
24 words
exerting a plurality of controlled resisting forces into the beads of the tire by connecting the tire to drive a variable torque producing apparatus;
Claim 10
Dependent Claim
24 words
exerting a plurality of controlled resisting forces into the beads of the tire by connecting the tire to drive a variable torque producing apparatus;
Claim 11
Dependent Claim
57 words
measuring the work expended by the tread surface of the tire at different rotational velocities of the tire for each of a plurality of said controlled resisting forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the controlled resisting force of the variable torque producing apparatus;
Claim 12
Dependent Claim
57 words
measuring the work expended by the tread surface of the tire at different rotational velocities of the tire for each of a plurality of said controlled resisting forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the controlled resisting force of the variable torque producing apparatus;
Claim 13
Dependent Claim
46 words
The method of claim 2 wherein the prime mover of step (1) is provided by an internal combustion engine of a vehicle, while the controlled resisting forces of step (2) is provided by a chassis dynamometer which is connected to the driven tires of the vehicle.
Claim 14
Dependent Claim
13 words
measuring the energy required of the prime mover to carry out step (2);
Claim 15
Dependent Claim
13 words
measuring the energy required of the prime mover to carry out step (2);
Claim 16
Dependent Claim
45 words
recording the vehicle power plant outputs with the work performed against the moving surface at the various velocities and controlled resistive forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the vehicle power output;
Claim 17
Dependent Claim
45 words
recording the vehicle power plant outputs with the work performed against the moving surface at the various velocities and controlled resistive forces to thereby provide a dictionary of stored terms which relates the work performed at the tire tread surface to the vehicle power output;
Claim 18
Dependent Claim
50 words
wearing away a portion of the tread surface by rotating the tire by means of said vehicle at a velocity corresponding to one of said various velocities and under a resistive force corresponding to one of said plurality of resistive forces, while recording the power plant output of the vehicle;
Claim 19
Dependent Claim
50 words
wearing away a portion of the tread surface by rotating the tire by means of said vehicle at a velocity corresponding to one of said various velocities and under a resistive force corresponding to one of said plurality of resistive forces, while recording the power plant output of the vehicle;
Claim 20
Dependent Claim
37 words
recording the prime mover power outputs with the owrk performed against the moving surface at the various velocities and controlled resisting forces which relates the work performed at the tread surface to the prime mover power output;
Claim 21
Dependent Claim
37 words
recording the prime mover power outputs with the owrk performed against the moving surface at the various velocities and controlled resisting forces which relates the work performed at the tread surface to the prime mover power output;
Claim 22
Dependent Claim
19 words
The method of claim 2 wherein the moving surface of step (1) is provided by a conventional test wheel.
Claim 23
Dependent Claim
56 words
weAring away an outer portion of the tread surface of a tire by rotatably mounting the last said tire with the tread surface thereof placed in rolling contact with a relative moving surface, and rotating the tire at one of said rotational velocities while one of said controlled resisting forces is exerted upon the tire beads;
Claim 24
Dependent Claim
56 words
weAring away an outer portion of the tread surface of a tire by rotatably mounting the last said tire with the tread surface thereof placed in rolling contact with a relative moving surface, and rotating the tire at one of said rotational velocities while one of said controlled resisting forces is exerted upon the tire beads;
Claim 25
Dependent Claim
41 words
comparing the rotational velocity and resisting force of step (4) to the dictionary of stored terms obtained in step (3) to determine the work required to wear away the outer portion of the tread surface of the tire of step (4).
Claim 26
Dependent Claim
41 words
comparing the rotational velocity and resisting force of step (4) to the dictionary of stored terms obtained in step (3) to determine the work required to wear away the outer portion of the tread surface of the tire of step (4).
Claim 27
Dependent Claim
52 words
wearing away an outer portion of a tire tread surface by rotating the tire by means of a prime mover at a velocity corresponding to one of said various velocities and under a resisting force corresponding to one of said controlled resisting force, while recording the power output of the prime mover;
Claim 28
Dependent Claim
52 words
wearing away an outer portion of a tire tread surface by rotating the tire by means of a prime mover at a velocity corresponding to one of said various velocities and under a resisting force corresponding to one of said controlled resisting force, while recording the power output of the prime mover;
Claim 29
Dependent Claim
22 words
The method of claim 2 wherein the resisting force of step (2) includes a liquid powered turbine connected to the rotating tire.
Claim 30
Dependent Claim
17 words
to thereby determine the work performed by said portion of the tire tread surface during step (4).
Claim 31
Dependent Claim
17 words
to thereby determine the work performed by said portion of the tire tread surface during step (4).
Claim 32
Dependent Claim
22 words
The method of claim 2 wherein the tire of step (1) is essentially the same type of tire used in step (5).
Claim 33
Dependent Claim
17 words
to thereby determine the work performed by said outer portion of the tire tread during step (5).
Claim 34
Dependent Claim
17 words
to thereby determine the work performed by said outer portion of the tire tread during step (5).
Claim 35
Dependent Claim
25 words
The method of claim 2 wherein the condition of step (5) corresponds to a specific geographical test route negotiated by a vehicle under prescribed conditions.
Claim 36
Dependent Claim
21 words
Method of measuring the work required to wear away part of the tire tread of a tire comprising the steps of:
Claim 37
Dependent Claim
21 words
Method of measuring the work required to wear away part of the tire tread of a tire comprising the steps of:
Claim 38
Dependent Claim
18 words
The method of claim 8 wherein the moving surface of step (2) is provided by a steel wheel.
Claim 39
Dependent Claim
25 words
The method of claim 8 wherein the condition of step (4) corresponds to a specific geographical test route negotiated by a vehicle under prescribed conditions.
Claim 40
Dependent Claim
23 words
The method of claim 8 wherein the torque producing means of step (2) is a liquid powered turbine connected to the rotating tire.
Claim 41
Dependent Claim
20 words
The method of claim 8 wherein the torque producing means of step (2) is attained through an electric force linkage.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-11 | 1978-05-13 | 1978-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-11 | 1982-05-13 | 1982-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-11 | 1986-05-13 | 1986-11-12 | $7700.00 | Window Closed / Lapsed |