A corrosion resistance test method for automobile wheel hub bearing

Abstract

The application provides a kind of automobile wheel hub bearing corrosion resistance test method, the method comprises the following steps: drive motor starts, wheel hub bearing is rotated at 300rpm for 1 hour;Drive motor starts, water pump system starts: wheel hub bearing rotates at the speed of 70km / h of car, spray mud water 45 minutes, nozzle flow rate 13L / min;Drive motor is closed, water pump system is closed: 15 minutes do not rotate, do not spray, rest;Heating system starts, blowing system starts: 12 hours of rest, during the test, the ambient temperature in the chamber is between 80℃-90℃, so that the mud water becomes dry dust;15 minutes rest, do not rotate, do not heat, do not spray;Drive motor starts: 45 minutes of rotation, do not heat, do not spray, dry dust is raised during the rotation process;Carry out large circulation, a total of 10 large circulations are completed.The beneficial effects of the application are: the environment of the automobile wheel hub bearing is simulated truly and effectively, a corrosion resistance test method is proposed, and the sealing performance and corrosion resistance are tested.

Description

Technical Field

[0001] This invention relates to the field of bearing corrosion resistance, and mainly to a corrosion resistance test method for automotive wheel hub bearings. Background Technology

[0002] In the industry, only independent wheel hub bearing mud and water splash or salt spray tests are conducted. The mud and water test spray system for wheel hub bearings generally uses a mud and water storage tank, a water pump, and one or two branch spray pipes to test one set of bearing samples at a time.

[0003] A search revealed that Chinese patent CN206492596 discloses a wheel hub bearing sealing mud and water testing machine, including a frame with rubber latches on the front and rear sides. Gates are located on both sides of the frame, allowing the bearing to move in and out along levers. A nozzle is fixedly connected to the frame at its bottom, connected to a curved water pipe, which is connected to a water pump. A drain outlet is located at an opening in the middle of the frame, with its bottom connected to the curved water pipe. A robotic arm is connected to the top of the frame, and a pressure-applying rotating head is fixedly connected to the bottom of the robotic arm, allowing for pressure rotation of the bearing. A fluorescent detector head is fixedly connected to the top of the frame, and a pressure detector is connected to the connecting column of the fluorescent detector head.

[0004] The shortcomings of existing technologies are: the lack of a combined test of salt water splash test, dust test, and heating corrosion test; and the lack of a comprehensive corrosion resistance test method based on a realistic and effective simulation of the environment of automotive wheel hub bearings. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the existing technology and provide a corrosion resistance test method for automobile wheel hub bearings to test their sealing performance and corrosion resistance.

[0006] The objective of this invention is achieved through the following technical solution: A method for testing the corrosion resistance of automotive wheel hub bearings, wherein the wheel hub bearing test sample is tested in a test chamber, and the method includes the following steps:

[0007] (1) Break-in test stage: The drive motor is started and the wheel hub bearing runs at 300 rpm for 1 hour;

[0008] (2) Slurry test stage:

[0009] (2.1) Drive motor starts, water pump system starts: wheel hub bearings rotate at a speed equivalent to 70km / h of automobile, spray mud and water for 45 minutes, nozzle flow rate is 13L / min;

[0010] (2.2) Turn off the drive motor and water pump system: stop rotating and spraying for 15 minutes, and let it stand still;

[0011] (3) Corrosion stage: The heating system is started and the blowing system is started: 12 hours of static setting, during which the ambient temperature in the test chamber is between 80℃ and 90℃, causing the mud and water to turn into dry dust.

[0012] (4) Dry dust test stage:

[0013] (4.1) Let stand for 15 minutes, without rotating, heating or spraying;

[0014] (4.2) Drive motor start-up: Rotate for 45 minutes without heating or spraying, and dry dust will be raised during the rotation process;

[0015] (5) Perform a large loop on steps (2), (3) and (4) to complete a total of 10 large loops;

[0016] (6) After the test, the wheel hub bearing is tested. The test includes measuring the water content of the grease, checking whether the wheel hub bearing is internally corroded, and checking whether the wheel hub bearing is working properly.

[0017] Furthermore, in step (2), steps (2.1) and (2.2) form a small loop, which is completed in 12 cycles.

[0018] Furthermore, in step (3), the test chamber is heated by blowing hot air through the pipes, so that the ambient temperature inside the test chamber is between 80℃ and 90℃.

[0019] Furthermore, in step (4), steps (4.1) and (4.2) form a small loop, which is completed in total with 48 loops.

[0020] The beneficial effects of this invention are as follows:

[0021] 1. The environment of automobile wheel hub bearings was realistically and effectively simulated, and a corrosion resistance test method was proposed to test its sealing performance and corrosion resistance.

[0022] 2. This method is not a traditional single mud and water seal test for wheel hub bearings. In addition to the mud and water seal test, it also includes a heating corrosion test and a dry dust test, essentially forming a test cycle consisting of three tests. This method can simultaneously test multiple sets of samples, resulting in high testing efficiency.

[0023] 3. The added heating corrosion test can not only test the high-temperature corrosion resistance by heating and blowing air, but also heat the mud and water in the previous test into dry dust; during the rotation, the dry dust will be raised and enter the bearing seal ring, and the sealing performance can be tested by the dry dust test. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the process of the present invention. Detailed Implementation

[0025] The present invention will now be described in detail with reference to the accompanying drawings and embodiments:

[0026] like Figure 1 As shown, a corrosion resistance test method for automotive wheel bearings is presented to examine the salt water sealing performance, dry dust sealing performance, and high-temperature corrosion resistance of the wheel bearing products. The test equipment includes four main control units: a rotary drive motor system, a mud pump system, a heating system, and a blowing system. The wheel bearing test samples are tested inside a test chamber. Multiple wheel bearing samples can be installed in one test chamber for simultaneous testing.

[0027] The corrosion resistance test method for automotive wheel hub bearings includes the following steps:

[0028] (1) Break-in test stage: The drive motor is started and the wheel hub bearing runs at 300 rpm for 1 hour; this step is mainly to break in the wheel hub bearing product, so that its bearing parts are fully lubricated and good test conditions are guaranteed. Temperature sensors and vibration sensors are installed on each sample to monitor the temperature and condition of the sample.

[0029] (2) Slurry test stage:

[0030] (2.1) Drive motor starts, water pump system starts: wheel hub bearing rotates at a speed equivalent to 70 km / h of automobile, spray mud and water for 45 minutes, nozzle flow rate is 13 L / min; mud and water are mainly composed of water, salt and Arizona A4 standard dust mixed in a certain proportion. In this embodiment, the preferred composition is: 30 L of water, 1.25 kg of salt and 5 kg of Arizona A4 standard dust.

[0031] (2.2) Turn off the drive motor and water pump system: stop rotating and spraying for 15 minutes, and let it stand still;

[0032] (2.3), (2.1) and (2.2) form a small cycle, and a total of 12 cycles are completed. This step takes a total of 12 hours.

[0033] (3) Corrosion stage: The heating system is started and the blowing system is started. After 12 hours of standing, the resistance wire is heated and the blower blows air. The test chamber is heated by blowing hot air through the pipeline. During this period, the ambient temperature in the test chamber is between 80℃ and 90℃, which turns the mud and water into dry dust. This step takes a total of 12 hours.

[0034] (4) Dry dust test stage:

[0035] (4.1) Let stand for 15 minutes, without rotating, heating or spraying;

[0036] (4.2) Drive motor start-up: Rotate for 45 minutes without heating or spraying, and dry dust will be raised during the rotation process;

[0037] (4.3) (4.1) and (4.2) form a small cycle, and a total of 48 cycles are completed; this step takes a total of 48 hours; due to the hot air blown in step (3), the test chamber is filled with dry dust at this time, so when the bearing rotates, the dust will enter the bearing seal.

[0038] (5) Perform a large cycle on steps (2), (3) and (4) for a total of 10 large cycles, with a total test time of 720 hours (excluding 1 hour of the break-in test phase).

[0039] (6) After the test, the wheel hub bearing is tested. The test includes measuring the water content of the grease, checking whether the wheel hub bearing is internally corroded, and checking whether the wheel hub bearing is working properly.

[0040] The test method described in this invention is applicable to corrosion resistance testing of automotive wheel hub bearings, assessing their sealing performance and heat corrosion resistance. It is suitable for wheel hub bearing manufacturers and R&D companies, as well as automotive OEMs. Other bearings or sealing products can also be tested using this method.

[0041] It is understood that, for those skilled in the art, any equivalent substitutions or modifications to the technical solutions and inventive concepts of this invention should fall within the scope of protection of the appended claims.

Claims

1. A corrosion resistance test method for automotive wheel hub bearings, characterized in that: The test samples of the wheel hub bearings are tested in a test chamber. The method includes the following steps: (1) Break-in test stage: The drive motor is started and the wheel hub bearing runs at 300 rpm for 1 hour; (2) Slurry test stage: (2.1) Drive motor starts, water pump system starts: wheel hub bearings rotate at a speed equivalent to 70km / h of automobile, spray mud and water for 45 minutes, nozzle flow rate is 13L / min; (2.2) Turn off the drive motor and water pump system: stop rotating and spraying for 15 minutes, and let it stand still; (3) Corrosion stage: The heating system is started and the blowing system is started: 12 hours of static setting, during which the ambient temperature in the test chamber is between 80℃ and 90℃, causing the mud and water to turn into dry dust. (4) Dry dust test stage: (4.1) Let stand for 15 minutes, without rotating, heating or spraying; (4.2) Drive motor start-up: Rotate for 45 minutes without heating or spraying, and dry dust will be raised during the rotation process; (5) Perform a large loop on steps (2), (3) and (4) to complete a total of 10 large loops; (6) After the test, the wheel hub bearing is tested. The test includes measuring the water content of the grease, checking whether the wheel hub bearing is internally corroded, and checking whether the wheel hub bearing is working properly.

2. The corrosion resistance test method for automotive wheel hub bearings according to claim 1, characterized in that: In step (2), steps (2.1) and (2.2) form a small loop, which is completed in 12 steps.

3. The corrosion resistance test method for automotive wheel hub bearings according to claim 2, characterized in that: In step (3), the test chamber is heated by blowing hot air through the pipes, so that the ambient temperature inside the test chamber is between 80℃ and 90℃.

4. The corrosion resistance test method for automotive wheel hub bearings according to claim 3, characterized in that: In step (4), steps (4.1) and (4.2) form a small loop, which is completed in a total of 48 loops.

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