Testing system for drivetrain
US-2015219529-A1 · Aug 6, 2015 · US
Rubber friction test method
US10890522B2 · US · B2
| Field | Value |
|---|---|
| Publication number | US-10890522-B2 |
| Application number | US-201816102962-A |
| Country | US |
| Kind code | B2 |
| Filing date | Aug 14, 2018 |
| Priority date | Sep 8, 2017 |
| Publication date | Jan 12, 2021 |
| Grant date | Jan 12, 2021 |
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Abstract
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In a rubber friction test method of measuring a friction coefficient of a rubber test specimen by relatively moving the rubber test specimen and a test road surface in a state in which the rubber test specimen is pressed to the test road surface by applying a load, the method includes a step of measuring a resistance force acting on the rubber test specimen while accelerating or decelerating a speed of the relative movement, and a step of calculating the friction coefficient based on the applied load and the measured resistance force.
First claim
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What is claimed is: 1. A rubber friction test method of measuring a friction coefficient of a rubber test specimen by relatively moving the rubber test specimen and a test road surface in a state in which the rubber test specimen is pressed to the test road surface by applying a load, wherein the method comprises: a step of measuring a resistance force acting on the rubber test specimen while accelerating or decelerating a speed of the relative movement wherein the measurement of the resistance force is carried out while straightly moving the rubber test specimen attached to a holder in relation to the stationary test road surface; and a step of calculating the friction coefficient based on the applied load and the measured resistance force, the friction coefficient is calculated in the step of calculating the friction coefficient by using a frictional force obtained by compensating the resistance force with an inertial force acting on the rubber test specimen and the holder. 2. The rubber friction test method according to claim 1 , wherein the load is applied to the rubber test specimen at a predetermined speed, before the step of measuring the resistance force. 3. The rubber friction test method according to claim 1 , wherein the rubber test specimen is pressed to the test road surface for a predetermined contact time before the step of measuring the resistance force. 4. The rubber friction test method according to claim 1 , wherein the step of measuring the resistance force accelerates or decelerates a speed of the relative movement at a fixed acceleration. 5. The rubber friction test method according to claim 1 , wherein the step of measuring the resistance force includes a front half portion which accelerates a speed of the relative movement at a fixed acceleration, and a last half portion which decelerates the speed of the relative movement at a fixed acceleration which has the same magnitude as that of the front half portion. 6. The rubber friction test method according to claim 1 , wherein the step of measuring the resistance force includes a front half portion which accelerates a speed of the relative movement at a fixed acceleration, and a last half portion which decelerates the speed of the relative movement at a fixed acceleration which has a different magnitude from that of the front half portion. 7. A rubber friction test method of measuring a friction coefficient of a rubber test specimen by relatively moving the rubber test specimen and a test road surface in a state in which the rubber test specimen is pressed to the test road surface by applying a load, wherein the method comprises: a step of measuring a resistance force acting on the rubber test specimen while accelerating or decelerating a speed of the relative movement; and a step of calculating the friction coefficient based on the applied load and the measured resistance force, wherein the load is applied to the rubber test specimen at a predetermined speed, before the step of measuring the resistance force. 8. The rubber friction test method according to claim 7 , wherein the measurement of the resistance force is carried out while straightly moving the rubber test specimen attached to a holder in relation to the stationary test road surface, and the friction coefficient is calculated in the step of calculating the friction coefficient by using a frictional force obtained by compensating the resistance force with an inertial force acting on the rubber test specimen and the holder. 9. The rubber friction test method according to claim 7 , wherein the rubber test specimen is pressed to the test road surface for a predetermined contact time before the step of measuring the resistance force. 10. The rubber friction test method according to claim 7 , wherein the step of measuring the resistance force accelerates or decelerates a speed of the relative movement at a fixed acceleration. 11. The rubber friction test method according to claim 7 , wherein the step of measuring the resistance force includes a front half portion which accelerates a speed of the relative movement at a fixed acceleration, and a last half portion which decelerates the speed of the relative movement at a fixed acceleration which has the same magnitude as that of the front half portion. 12. The rubber friction test method according to claim 7 , wherein the step of measuring the resistance force includes a front half portion which accelerates a speed of the relative movement at a fixed acceleration, and a last half portion which decelerates the speed of the relative movement at a fixed acceleration which has a different magnitude from that of the front half portion. 13. A rubber friction test method of measuring a friction coefficient of a rubber test specimen by relatively moving the rubber test specimen and a test road surface in a state in which the rubber test specimen is pressed to the test road surface by applying a load, wherein the method comprises: a step of measuring a resistance force acting on the rubber test specimen while accelerating or decelerating a speed of the relative movement; and a step of calculating the friction coefficient based on the applied load and the measured resistance force, wherein the step of measuring the resistance force includes a front half portion which accelerates a speed of the relative movement at a fixed acceleration, and a last half portion which decelerates the speed of the relative movement at a fixed acceleration which has (i) the same magnitude as that of the front half portion; or (ii) a difference magnitude from that of the front half portion. 14. The rubber friction test method according to claim 13 , wherein the last half portion which decelerates the speed of the relative movement at a fixed acceleration which has the same magnitude as that of the front half portion. 15. The rubber friction test method according to claim 13 , wherein the last half portion which decelerates the speed of the relative movement at a fixed acceleration which has a different magnitude from that of the front half portion. 16. The rubber friction test method according to claim 13 , wherein the measurement of the resistance force is carried out while straightly moving the rubber test specimen attached to a holder in relation to the stationary test road surface, and the friction coefficient is calculated in the step of calculating the friction coefficient by using a frictional force obtained by compensating the resistance force with an inertial force acting on the rubber test specimen and the holder. 17. The rubber friction test method according to claim 13 , wherein the load is applied to the rubber test specimen at a predetermined speed, before the step of measuring the resistance force. 18. The rubber friction test method according to claim 13 , wherein the rubber test specimen is pressed to the test road surface for a predetermined contact time before the step of measuring the resistance force. 19. The rubber friction test method according to claim 13 , wherein the step of measuring the resistance force accelerates or decelerates a speed of the relative movement at a fixed acceleration.
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- What does patent US10890522B2 cover?
- In a rubber friction test method of measuring a friction coefficient of a rubber test specimen by relatively moving the rubber test specimen and a test road surface in a state in which the rubber test specimen is pressed to the test road surface by applying a load, the method includes a step of measuring a resistance force acting on the rubber test specimen while accelerating or decelerating a …
- Who is the assignee on this patent?
- Toyo Tire & Rubber Co, Toyo Tire Corp
- What technology area does this patent fall under?
- Primary CPC classification G01N19/02. Mapped technology areas include Physics.
- When was this patent published?
- Publication date Tue Jan 12 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (B2). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 1 related publication on this page (citations in our corpus or others sharing the same primary CPC).