CN-115931396-B - Method for testing adhesion performance of mute cotton and tire

Abstract

The invention discloses a method for testing the bonding performance of silent cotton and a tire, which is characterized by comprising the following steps of S1, sticking a first silent cotton and a second silent cotton in the tire along the movement direction of the tire in a non-pressure state, wherein the length of the first silent cotton is larger than the length of a long axis of a grounding mark of the tire, the length of the second silent cotton is smaller than the length of the long axis of the grounding mark of the tire, S2, pressurizing the inside of the tire to enable the first silent cotton and the second silent cotton to be bonded with the inside of the tire, and S3, carrying out load simulation on the tire after being pressurized to drive on a road surface. Compared with the prior art, the invention has the beneficial effects that the influence of various factors of the tire on the mute cotton in the running process is analyzed, and a corresponding test mode is designed, so that the adhesive property of the mute cotton and the tire can be better judged.

Inventors

• ZHAO SHUAI
• LI DAPENG
• HAN FENGJIN
• HAN LEI
• LIU JIE
• WANG YUJIAN
• Luo Ruchuan
• ZHANG CHENXI
• MIAO MEI
• WANG HONGXIA
• SUN CHAO
• CHAI YONGSEN
• WANG JUN
• LIU JUNJIE
• SU MING
• XU WEI
• ZHANG JUNHUA
• LU YANWEI
• XU BING

Assignees

• 青岛双星轮胎工业有限公司

Dates

Publication Date

20260512

Application Date

20221130

Claims (5)

1. 1. The method for testing the adhesion performance of the mute cotton and the tire is characterized by comprising the following steps of: S1, in a non-pressure state, sticking a first mute cotton and a second mute cotton in the tire along the movement direction of the tire, wherein the length of the first mute cotton is larger than the length of a long axis of a grounding mark of the tire, and the length of the second mute cotton is smaller than the length of the long axis of the grounding mark of the tire; s2, stage pressurizing is carried out on the inside of the tire, so that the first mute cotton and the second mute cotton are adhered and pressed with the inside of the tire; S3, carrying out load simulation on the pressurized tire to drive on a road surface; the length calculation mode of the long axis of the tire grounding mark is as follows: L=2×r×sin α (formula 1); α= arccos ((R-a)/R) (formula 2); a=k×b (formula 3); Wherein, the L is the length of the long axis of the tire footprint in millimeters; r is the radius of the tire, and the unit is millimeter; a is the sinking amount of the tire, and the unit is millimeter; k is the tire sinking rate, and k is less than or equal to 0.2 and less than or equal to 0.3; b is the height of the tire end face, and the unit is millimeter; The length of the first mute cotton and the length of the second mute cotton are calculated in the following ways: The length of the first mute cotton is L+2*c, and the unit millimeter; the length of the second mute cotton is L-2*c, and the unit millimeter; c is the thickness of the mute cotton, and the unit millimeter; The stage pressurizing method comprises the following steps: A1, after the tire is inflated to a first pressure, parking for a first time; A2, inflating the tire for a second pressure and then parking for a second time; a3, inflating the tire for a third pressure and then parking for a third time; A4, adjusting the tire pressure to a third pressure; Wherein, the The first pressure is not less than 20% of the standard inflation pressure and not more than 30% of the standard inflation pressure, and the first time is not less than 1 hour; The second pressure is not less than 60% of the standard inflation pressure and not more than 80% of the standard inflation pressure, and the second time is not less than 2 hours; The third pressure is not less than 120% of the standard inflation pressure and not greater than the sidewall maximum inflation pressure MAX PRESS, and the third time is not less than 20 hours.
2. 2. The method of claim 1, wherein k=0.3 is calculated for the length of the first mute cotton and k=0.2 is calculated for the length of the second mute cotton.
3. 3. The method according to claim 1, wherein the method of simulating road running by load comprises: At the third pressure, the load applied force is no less than 140% and no greater than 160% of the maximum load of the tire; the simulation speed is not less than 95km/h and not more than 110km/h; the simulated driving time is 80-100 hours.
4. 4. The method of testing of claim 1, wherein the first and second silent cotton are provided alternately.
5. 5. The method according to claim 4, wherein the number of the first mute cotton and the number of the second mute cotton are 2, and the first mute cotton and the second mute cotton are arranged in a cross staggered structure.

Description

Method for testing adhesion performance of mute cotton and tire Technical Field The invention belongs to the field of tire performance test, and particularly relates to a method for testing the adhesion performance of silent cotton and a tire. Background Because of the characteristics of the electric automobile, the noise of the electric automobile is low, and therefore, the requirements on the silencing performance of the tire are far higher than those of a conventional fuel vehicle. Particularly, with the improvement of the market share of electric automobiles, all major stream manufacturers promote silent cotton tire products which meet the market demands. At present, the silent cotton tire is usually mounted by adhering multiple sections of silent cotton to the inner tire surface of the tire. The method for testing the performance of the car tire in the room is mainly based on the GB4502-2016 execution standard, and the standard does not comprise the adhesion performance test of the inner tread of the tire and the silent cotton, so the related testing method belongs to the blank field. Disclosure of Invention The details of one or more embodiments of the application are set forth in the accompanying drawings and the description below to provide a more thorough understanding of the other features, objects, and advantages of the application. The invention provides a method for testing the adhesion performance of silent cotton and a tire, which can better judge the adhesion performance of the silent cotton and the tire by analyzing the influence of various factors of the tire on the silent cotton in the running process and further designing a corresponding test mode. The invention discloses a method for testing the adhesive property of silent cotton and a tire, which comprises the following steps: S1, in a non-pressure state, sticking a first mute cotton and a second mute cotton in the tire along the movement direction of the tire, wherein the length of the first mute cotton is larger than the length of a long axis of a grounding mark of the tire, and the length of the second mute cotton is smaller than the length of the long axis of the grounding mark of the tire; s2, stage pressurizing is carried out on the inside of the tire, so that the first mute cotton and the second mute cotton are adhered and pressed with the inside of the tire; and S3, carrying out load simulation road surface running on the pressurized tire. In some embodiments, the tire footprint long axis length is calculated by: L=2×r×sin α (formula 1); α= arccos ((R-a)/R) (formula 2); a=k×b (formula 3); Wherein, the L is the length of the long axis of the tire footprint in millimeters; r is the radius of the tire, and the unit is millimeter; a is the sinking amount of the tire, and the unit is millimeter; k is the tire sinking rate, and k is less than or equal to 0.2 and less than or equal to 0.3; b is the height of the tire end face, and the unit is millimeter; The length of the first mute cotton and the length of the second mute cotton are calculated in the following ways: the length of the first mute cotton is L+2*c, the unit millimeter is taken as k=0.3; the length of the second mute cotton is L-2*c, the unit millimeter is taken as k=0.2; c is the thickness of the silence cotton, and the unit is millimeter. In some embodiments, the method of stage pressurization is: A1, after the tire is inflated to a first pressure, parking for a first time; A2, inflating the tire for a second pressure and then parking for a second time; a3, inflating the tire for a third pressure and then parking for a third time; A4, adjusting the tire pressure to a third pressure; Wherein, the The first pressure is not less than 20% of the standard inflation pressure and not more than 30% of the standard inflation pressure, and the first time is not less than 1 hour; The second pressure is not less than 60% of the standard inflation pressure and not more than 80% of the standard inflation pressure, and the second time is not less than 2 hours; The third pressure is not less than 120% of the standard inflation pressure and not greater than the sidewall maximum inflation pressure MAX PRESS, and the third time is not less than 20 hours. In some embodiments, the method of load simulation road surface travel is: At the third pressure, the load applied force is no less than 140% and no greater than 160% of the maximum load of the tire; the simulation speed is not less than 95km/h and not more than 110km/h; the simulated driving time is 80-100 hours. In some embodiments, the first and second silent cotton are disposed alternately. In some embodiments, the number of the first mute cotton and the number of the second mute cotton are 2, and the first mute cotton and the second mute cotton are arranged in a cross staggered structure. Compared with the prior art, the invention has the following beneficial effects: 1. The length of the first mute cotton and the length of the secon