CN116296460A - Automobile disc brake friction block abrasion life test method - Google Patents
Automobile disc brake friction block abrasion life test method Download PDFInfo
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- CN116296460A CN116296460A CN202310302210.5A CN202310302210A CN116296460A CN 116296460 A CN116296460 A CN 116296460A CN 202310302210 A CN202310302210 A CN 202310302210A CN 116296460 A CN116296460 A CN 116296460A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M17/00—Testing of vehicles
- G01M17/007—Wheeled or endless-tracked vehicles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B21/00—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant
- G01B21/02—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness
- G01B21/08—Measuring arrangements or details thereof, where the measuring technique is not covered by the other groups of this subclass, unspecified or not relevant for measuring length, width, or thickness for measuring thickness
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
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Abstract
The invention relates to a method for testing the abrasion life of a friction block of an automobile disc brake, which belongs to the technical field of automobile braking and comprises the following steps: s1: determining a regional environment in which the vehicle is used; s2: recording the working temperature, starting and stopping speeds and deceleration of a brake of the vehicle with the use mileage reaching 1 ten thousand kilometers in the area; s3: measuring the thickness of a new product of the friction block of the vehicle brake and the thickness after 1 ten thousand kilometers are used, and calculating the abrasion thickness of the friction block; s4: calculating the initial speed and the final speed of the braking corresponding to the braking working condition, the initial temperature and the deceleration of the friction block, and calculating the distribution interval of the initial speed and the final speed and the initial temperature of the friction block, wherein the deceleration is smaller than 0.1 g-0.6 g; s5: calculating the bench test inertia of the vehicle; s6: performing a bench simulated wear life test; s7: detecting thickness and abrasion of the friction block, and comparing the abrasion value with the abrasion thickness of the step S3; the abrasion thickness of the bench friction block is consistent with that of the operating vehicle.
Description
Technical Field
The invention belongs to the technical field of automobile braking, and relates to a method for testing the abrasion life of a friction block of an automobile disc brake.
Background
Automobiles become an important pillar industry in China, and private automobiles are gradually popularized in ordinary families in China. The disc brake has become a standard configuration of passenger cars because of its stable braking performance, easy heat dissipation and beautiful appearance. With the further development of the automobile industry in China, the private car owners pay more attention and expectations to the braking performance and service life of the automobiles. After market is due to friction block not wear-resisting ", and the phenomenon, dispute and complaint of three bags are not satisfied in life time. The reputation of the automobile company and the brake system provider is adversely affected, and the after-sales maintenance cost is increased to affect the performance of the company. In order to accurately obtain the wear life of the friction block of the disc brake, the use conditions of a real vehicle, such as the use area and the use condition, need to be combined: braking speed, temperature and deceleration; and collecting statistics, reasonably compiling a bench simulation test aiming at the working conditions, and comparing the bench simulation test with a real vehicle road test, and simulating and compiling a bench test specification for evaluating the wear life of the friction block.
Disclosure of Invention
In view of the above, the present invention aims to provide a test analysis method for wear life of a friction block of an automotive disc brake.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a wear life test method for a friction block of an automobile disc brake comprises the following steps:
s1: determining the abrasion influence of the regional environment of the vehicle and road conditions on the friction blocks of the automobile brake;
s2: a GPS speed sensor, a deceleration sensor and a friction block temperature sensor are arranged on a vehicle, and the temperature, the starting speed, the stopping speed and the deceleration of the vehicle, which are used for reaching 1 ten thousand kilometers in the area, of the brake work are recorded;
s3: measuring the thickness of a new product of the friction block of the vehicle brake and the thickness after 1 ten thousand kilometers are used, and calculating the abrasion thickness of the friction block;
s4: carrying out statistical analysis on data acquired by the sensor, counting the initial and final braking speeds and the initial temperature and the deceleration of the friction block, which correspond to braking working conditions, wherein the statistical deceleration is smaller than 0.1 g-0.6 g, calculating and counting the distribution interval of the initial and final speeds and the initial temperature of the friction block, and calculating the interval average value;
s5: calculating the bench test inertia of the vehicle;
s6: according to the data counted in the step S4, a bench test program is compiled, and a bench simulated abrasion life test is carried out;
s7: after the bench simulation abrasion life test is completed, performing abrasion detection on the thickness of the friction block, and comparing the abrasion value with the abrasion thickness of the step S3; the abrasion thickness of the friction block of the bench is consistent with that of the operating vehicle, and the whole service life mileage of the friction block is calculated and deduced.
Further, the method for calculating the wear thickness of the friction block in step S3 is as follows:
s31: 8 measuring points are respectively arranged at the contour edges of the new friction block and the left outer sheet, the left inner sheet, the right outer sheet and the right inner sheet of the friction block after 1 ten thousand kilometers are used, and the thicknesses of the new friction block and the friction block are respectively measured;
s32: subtracting the thickness of the corresponding measuring points of the friction block after 1 ten thousand kilometers from the thickness of each measuring point on the new friction block to obtain the abrasion thickness of each measuring point;
s33: and respectively counting the average wear thickness, the maximum radial direction and the maximum circumferential direction of the left outer sheet, the left inner sheet, the right outer sheet and the right inner sheet.
Further, S41: respectively counting the braking initial speed, the final speed, the friction block initial temperature and the braking times which correspond to the deceleration below 0.1g, between 0.1g and 0.2g, between 0.2g and 0.3g, between 0.3g and 0.4g, between 0.4g and 0.5g and between 0.5g and 0.6 g;
s42: calculating the interval average value of the initial speed, the final speed and the initial temperature of the friction block, wherein:
the initial velocity interval mean includes:
wherein N1-N6 are the total number of the initial speed data in 6 intervals, V i Representing an initial velocity;
the final speed interval mean value comprises:
wherein N '1-N' 6 are the total number of last speed data in 6 intervals, V f Represents the end speed;
the average value of the initial temperature interval of the friction block comprises:
wherein N '1-N' 6 is the total number of the initial temperature data of the friction block in 6 intervals, T i Indicating the initial temperature of the friction block.
Further, the calculation formula of the bench test inertia in step S5 is as follows:
I＝M*R 2 *β
wherein I is the test inertia loaded by a bench test, M is the total mass of the vehicle when carrying 2 persons, R is the rolling radius of the vehicle, and beta is the brake distribution ratio of the operating vehicle.
Further, in step S6, the bench test specification is: programming test according to 0.1g, wherein the deceleration is less than or equal to 0.1 g; 0.1g < deceleration.ltoreq.0.2 g programming test as per 0.2g, and so on.
Further, in step S7, the thickness of the friction block before and after the bench test is detected, it is determined whether the wear thickness of the bench simulation test is consistent with the wear of the vehicle mileage of 1 ten thousand Km, if so, the bench test program is fixed, and the whole life mileage of the friction block is calculated and deduced:
l represents the service life of the friction block, T represents the allowable wear thickness of the friction block, and delta represents the test wear thickness of the friction block bench;
if the abrasion values are inconsistent, the braking cycle times are adjusted, the test is repeated until the abrasion values are consistent with the abrasion values of the operating vehicle, and the test program is fixed.
The invention has the beneficial effects that: the method can rapidly and effectively predict the abrasion life condition of the friction block of the brake, and is easy to popularize and apply.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
FIG. 1 is a flow chart of a test analysis method for wear life of a friction block of an automotive disc brake;
fig. 2 is a schematic diagram of a friction block measurement point.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a test analysis method for wear life of a friction block of an automotive disc brake includes the following steps:
s1: determining a vehicle use area, such as southwest area, northeast area, northwest area, middle-aged area and the like; the influence of the environment and road conditions in different areas on the abrasion of the friction blocks of the brake is determined, and the areas in southwest are mountainous roads, high in humidity and the like.
S2: a certain operating vehicle (a drop or a taxi) is provided with a GPS speed sensor, a deceleration sensor and a friction block temperature sensor. Recording the working temperature, starting and stopping speed and deceleration of a brake of the operating vehicle with the use mileage reaching 1 ten thousand kilometers in the area; the method comprises the steps of braking initial speed, final speed, friction block initial temperature and braking times which are less than or equal to 0.1 g; the braking initial speed, the final speed, the friction block temperature and the braking times which are corresponding to the deceleration of more than 0.1g and less than or equal to 0.2 g; the deceleration is more than 0.2g and less than or equal to 0.3g, and the corresponding braking initial speed, final speed, friction block temperature and braking times are all equal to or less than 0.3 g; up to 0.6g was counted. And calculating the average value of the initial speed, the final speed and the initial temperature of the friction block.
S3: measuring a new product of a brake friction block of an operating vehicle and using the thickness of 1 ten thousand kilometers, and calculating the abrasion thickness of the friction block;
the thickness of 8 points was measured as shown in fig. 2, and the average value of 1 ten thousand Km for the new product and the road test mileage was measured, respectively, and the thickness of the friction block for the new product-road test mileage 1 ten thousand km=wear thickness. The data shown in table 1 were then calculated.
TABLE 1
S4: statistical analysis is performed on the data collected by the sensor: the braking working condition with the deceleration less than 0.1g corresponds to the initial braking speed, the final braking speed, the initial temperature of the friction block and the deceleration. And similarly, respectively counting the initial braking speed and the final braking speed corresponding to the braking working conditions of which the deceleration is smaller than 0.2g, 0.3g, 0.4g, 0.5g and 0.6g, and the initial temperature and the deceleration of the friction block. And calculating and counting corresponding initial speed and final speed, and the distribution interval of the initial temperature of the friction block.
S41: respectively counting the braking initial speed, the final speed, the friction block initial temperature and the braking times which correspond to the deceleration below 0.1g, between 0.1g and 0.2g, between 0.2g and 0.3g, between 0.3g and 0.4g, between 0.4g and 0.5g and between 0.5g and 0.6 g;
s42: calculating the interval average value of the initial speed, the final speed and the initial temperature of the friction block, wherein:
the initial velocity interval mean includes:
wherein N1-N6 are the total number of the initial speed data in 6 intervals, V i Representing an initial velocity;
the final speed interval mean value comprises:
wherein N '1-N' 6 are the total number of last speed data in 6 intervals, V f Represents the end speed;
the average value of the initial temperature interval of the friction block comprises:
wherein N '1-N' 6 is the total number of the initial temperature data of the friction block in 6 intervals, T i Indicating the initial temperature of the friction block.
S5: calculating the bench test inertia I of the commercial vehicle
I＝M*R 2 *β
M is the mass Kg of the operating vehicle 2; r is the rolling radius m of the commercial vehicle; beta is the brake distribution ratio of the commercial vehicle.
S6: and (3) according to the data counted in the step S4, programming a bench test program, and carrying out a bench simulated abrasion life test. Bench test standardization was performed based on the statistical data of the vehicle as shown in table 2.
TABLE 2
| Sequence number | Deceleration [ g ]] | Initial speed [ km/h ]] | End speed [ km/h] | Initial temperature of friction block | Statistics of brake cycle times |
| 1 | 0.1 | Statistical mean | Statistical mean | Statistical mean | ≤0.1 |
| 2 | 0.2 | Statistical mean | Statistical mean | Statistical mean | 0.1g＜N≤0.2 |
| 3 | 0.3 | Statistical mean | Statistical mean | Statistical mean | 0.2g＜N≤0.3g |
| 4 | 0.4 | Statistical mean | Statistical mean | Statistical mean | 0.3g＜N≤0.4 |
| 5 | 0.5 | Statistical mean | Statistical mean | Statistical mean | 0.4g＜N≤0.5 |
| 6 | 0.6 | Statistical mean | Statistical mean | Statistical mean | 0.5g＜N≤0.6g |
Programming test according to 0.1g, wherein the deceleration is less than or equal to 0.1 g; the same applies to the programming test with 0.2g and 0.1g < deceleration less than or equal to 0.2 g.
S7: and after the bench simulation abrasion life test is finished, detecting the thickness abrasion of the friction block, and comparing the abrasion value with the abrasion thickness of S3. The abrasion thickness of the bench friction block is basically consistent with that of the operating vehicle, and if the abrasion thickness of the bench friction block is basically consistent with that of the operating vehicle, the bench test procedure is fixed. And calculating to deduce the whole life mileage of the friction block.
L represents the service life Km of the friction block; t represents the allowable wear thickness mm of the friction block; delta represents the abrasion thickness mm of the friction block bench test.
If the abrasion values are inconsistent, the braking cycle times are properly adjusted, the test is repeated until the abrasion values are consistent with the abrasion values of the operating vehicle, and the test program is fixed.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (6)
1. A wear life test method for a friction block of an automobile disc brake is characterized by comprising the following steps of: the method comprises the following steps:
s1: determining the abrasion influence of the regional environment of the vehicle and road conditions on the friction blocks of the automobile brake;
s2: a GPS speed sensor, a deceleration sensor and a friction block temperature sensor are arranged on a vehicle, and the temperature, the starting speed, the stopping speed and the deceleration of the vehicle, which are used for reaching 1 ten thousand kilometers in the area, of the brake work are recorded;
s3: measuring the thickness of a new product of the friction block of the vehicle brake and the thickness after 1 ten thousand kilometers are used, and calculating the abrasion thickness of the friction block;
s4: carrying out statistical analysis on data acquired by the sensor, counting the initial and final braking speeds and the initial temperature and the deceleration of the friction block, which correspond to braking working conditions, wherein the statistical deceleration is smaller than 0.1 g-0.6 g, calculating and counting the distribution interval of the initial and final speeds and the initial temperature of the friction block, and calculating the interval average value;
s5: calculating the bench test inertia of the vehicle;
s6: according to the data counted in the step S4, a bench test program is compiled, and a bench simulated abrasion life test is carried out;
s7: after the bench simulation abrasion life test is completed, performing abrasion detection on the thickness of the friction block, and comparing the abrasion value with the abrasion thickness of the step S3; the abrasion thickness of the friction block of the bench is consistent with that of the operating vehicle, and the whole service life mileage of the friction block is calculated and deduced.
2. The automobile disc brake pad wear life test method according to claim 1, wherein: the method for calculating the abrasion thickness of the friction block in the step S3 is as follows:
s31: 8 measuring points are respectively arranged at the contour edges of the new friction block and the left outer sheet, the left inner sheet, the right outer sheet and the right inner sheet of the friction block after 1 ten thousand kilometers are used, and the thicknesses of the new friction block and the friction block are respectively measured;
s32: subtracting the thickness of the corresponding measuring points of the friction block after 1 ten thousand kilometers from the thickness of each measuring point on the new friction block to obtain the abrasion thickness of each measuring point;
s33: and respectively counting the average wear thickness, the maximum radial direction and the maximum circumferential direction of the left outer sheet, the left inner sheet, the right outer sheet and the right inner sheet.
3. The automobile disc brake pad wear life test method according to claim 1, wherein: in the step S4, the specific statistical analysis steps are as follows:
s41: respectively counting the braking initial speed, the final speed, the friction block initial temperature and the braking times which correspond to the deceleration below 0.1g, between 0.1g and 0.2g, between 0.2g and 0.3g, between 0.3g and 0.4g, between 0.4g and 0.5g and between 0.5g and 0.6 g;
s42: calculating the interval average value of the initial speed, the final speed and the initial temperature of the friction block, wherein:
the initial velocity interval mean includes:
wherein N1-N6 are the total number of the initial speed data in 6 intervals, V i Representing an initial velocity;
the final speed interval mean value comprises:
wherein N '1-N' 6 are the total number of last speed data in 6 intervals, V f Represents the end speed;
the average value of the initial temperature interval of the friction block comprises:
wherein N '1-N' 6 is the total number of the initial temperature data of the friction block in 6 intervals, T i Indicating the initial temperature of the friction block.
4. The automobile disc brake pad wear life test method according to claim 1, wherein: the calculation formula of the bench test inertia in step S5 is as follows:
I＝M*R 2 *β
wherein I is the test inertia loaded by a bench test, M is the total mass of the vehicle when carrying 2 persons, E is the rolling radius of the vehicle, and beta is the brake distribution ratio of the operating vehicle.
5. The automobile disc brake pad wear life test method according to claim 1, wherein: in step S6, the bench test specification is: programming test according to 0.1g, wherein the deceleration is less than or equal to 0.1 g; 0.1g < deceleration.ltoreq.0.2 g programming test as per 0.2g, and so on.
6. The automobile disc brake pad wear life test method according to claim 1, wherein: in step S7, the thickness of the friction block before and after the bench test is detected, it is determined whether the abrasion thickness of the bench simulation test is consistent with the abrasion of the vehicle mileage of 1 ten thousand Km, if so, the bench test procedure is fixed, and the whole life mileage of the friction block is calculated and deduced:
l represents the service life of the friction block, T represents the allowable wear thickness of the friction block, and delta represents the test wear thickness of the friction block bench;
if the abrasion values are inconsistent, the braking cycle times are adjusted, the test is repeated until the abrasion values are consistent with the abrasion values of the operating vehicle, and the test program is fixed.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723280A (en) * | 2023-12-14 | 2024-03-19 | 中国汽车工程研究院股份有限公司 | Method for predicting service life of brake lining by using inertial bench |
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- 2023-03-24 CN CN202310302210.5A patent/CN116296460A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117723280A (en) * | 2023-12-14 | 2024-03-19 | 中国汽车工程研究院股份有限公司 | Method for predicting service life of brake lining by using inertial bench |
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