45 results about "Radial Force Variation" patented technology

Methodology for characterizing non-uniformity forces at a tire spindle, such as low and high speed radial force variations and high speed tangential force variations include the steps of measuring radial run out and radial or tangential force variations at high and / or low speeds. From such measurements, the contribution of a predetermined type of stiffness variation (e.g. radial, tangential, extensional, bending) to respective radial and / or tangential force variations can be determined. Signature analysis statistical methods may also be utilized to characterize such tire non-uniform forces for different steps and reference physical angles of a tire construction process. Based on the characterization of such tire non-uniform forces, additional process steps may further correspond to tire grading and / or sorting processes, physical tire modification processes and tire manufacturing processes. Tire correction mechanisms and / or feedback control in a tire manufacturing process preferably yield tires having radial run out and stiffness variation parameters that are out of phase for one or more harmonics, thus yielding a reduction in the non-uniformity forces such as radial and tangential force variations at a tire spindle.

A method and apparatus for testing tires. In step (110), the radial force variation is measured in the current direction of rotation. The first harmonic of this force variation is calculated in step (120) and a tire position corresponding to either zero crossing of the first harmonic is determined in step (130). In step (140), the tire position is monitored until a zero crossing is reached. The rotation direction is reversed at the appropriate location in step (150) and the test is continued.

A tire manufacturing method includes a method for optimizing the uniformity of a tire by reducing the after cure radial force variation. The after cure radial force variation vector is modeled as a vector sum of each of the vectors representing contributions arising from the tire building steps—the “tire room effect vector” and a vector representing contributions arising from the vulcanization and uniformity measurement steps—the “curing room effect vector.” In further detail, both the tire room and curing room effect vectors can be further decomposed into sub-vectors representing each radial force variation contribution for which a measurable indicator is available. For a series of tires, the method obtains such measurements as the before cure radial runout (RRO) at one or more stages of the building sequence, measurements of loading angles on the tire building equipment, and measurements made during vulcanization process.

Based upon rigidity classifications of wheels and radial runout classifications of the wheels, the lower the rigidity classification or the lower the radial runout classification, the more likely a methodology (heavy point-light point alignment) is selected in which a light point of static imbalance of the tire and a heavy point of static imbalance of the wheel are aligned with each other, than another methodology (radial force variation alignment) in which a peak position of a primary component of radial force variation of the tire and a bottom position of a primary component of radial runout of the wheel are aligned with each other, so as to assemble a tire and a wheel together.

Improved and more easily implemented methods for predicting uniformity parameters such as uneven mass distribution, radial run out and high speed radial force variation utilize other measurements such as the tire crown thickness variation. When high speed radial force variation is calculated, low speed radial force variation is also measured. Tire crown thickness variation can be measured in different fashions depending on the particular tire manufacturing process employed. By electronically determining resultant uniformity parameters, tires can be improved by rectification to address the uniformity levels. In addition, tire manufacturing can be improved by altering the resultant location of tire crown thickness variation relative to other aspects of the tire and / or tire manufacturing process.

A method of improving the high-speed uniformity of tire performance that reduces low and / or high harmonics. The method includes determining a force variation that is created by rotation of a first tire, having a first tread design, at high speed. A second order harmonic of the force variation is analyzed. A second tire design is generated that circumferentially shifts one or more ribs of the first tread design to minimize the second order harmonic alone or in combination with other order harmonics.

The invention discloses a single-tooth rotating cutting rock-breaking mechanism testing method, and the method comprises the steps: 1) determining a rotating radius r according to the type and size of a cutting teeth, and manufacturing a rock sample; 2) determining the rotating speed n of the cutting tooth according to a torque, rotating speed and angle sensor and a data collection system, and determining the cutting speed v of the cutting tooth; 3) adjusting a cutting thickness adjustment oil cylinder, determining the maximum cutting thickness hmax through a dividing ruler II, determining the instantaneous position (shown in the description) of the cutting tooth through the torque, rotating speed and angle sensor and the data collection system, and obtaining the instantaneous cutting thickness; 4) carrying out one-time complete cutting process, collecting a signal of a pressure sensor through the data collection system, obtaining a radial force Fr, collecting a torque signal T through the torque, rotating speed and angle sensor, and obtaining a current force Fc. The method is mainly used for the research of a single-cutting-tooth cutting crescent rock chip formation mechanism, the change rules of the cutting force and the radial force, and the impact on a cutting parameter from a cutting speed.

The invention relates to a high-precision elastic tapered bore rolling device of a cone sealing pipe joint, which belongs to a machine processing tool. The rolling device comprises a knife handle body, a rectangular pressure spring, an outer sliding sleeve, a locating pin roll, a core sleeve, a rolling mandril, a bearing sleeve, a thrust ball bearing, an adjusting pad, a flange sleeve and a roller. Compared with the traditional processing methods of drilling, internal boring and polishing, the production efficiency can be improved manyfold by adopting the rolling device to roll the conical surface inner bore of the cone sealing pipe joint; the surface roughness can be not more than Ra0.4 so that the requirements of a working drawing are stably reached, and the metal surface of the conicalsurface inner bore is strengthened, and thereby, the strength and the hardness of the surface layer are improved. The rolling device has good generality, and a rolling head fitting the size of the cone sealing pipe joint can be rapidly replaced. The elasticity of the spring can enable the changes of the axial force and the radial force which are borne by the rolling device in rolling the conical surface inner bore to be smaller; compared with a rigid rolling device, the abrasion of the rolling head of the rolling device is reduced, and thereby, the service life of the rolling device is prolonged by 3 to 5 times.