A device for brake fluid leakage fatigue test of automobile reservoir

Abstract

The application relates to a device for brake fluid leakage fatigue test of an automobile liquid storage tank, and belongs to the technical field of automobile braking. A swing cylinder seat and a swing support seat are respectively connected to the mounting base of a mechanical structure, the swing cylinder is fixedly connected to the swing cylinder seat, swing supports are respectively connected with the swing support seat and the swing cylinder, a pressurizing cylinder and a test piece fixing frame are respectively fixedly connected to the swing supports, the test piece fixing frame is used for fixing a master cylinder with tank assembly, and a push rod of the pressurizing cylinder is connected with the master cylinder with tank assembly. The device has the advantages of novel structure, two sets of control systems (a pressurizing control system and a swing control system) used in a single work station, independently set initial angle setting, termination angle setting, action frequency and action time, simulation of different road conditions for test, effective monitoring of product brake fluid leakage in the fatigue test process, and judgment of the reliability of the product.

Description

Technical Field

[0001] This invention relates to the field of automotive braking technology, and more specifically to a device for fatigue testing of brake fluid leakage in automotive reservoirs. Background Technology

[0002] With the rapid development of the automotive industry and the need to improve vehicle safety, vehicles are equipped with various warning devices that display fault warnings via instrument panel lights. For traditional automotive vacuum booster assemblies, the brake fluid reservoir contains a brake fluid level warning device, marked with "min" and "max" markings. To ensure the brake fluid remains within its limits and prevent leakage, a pressure test is conducted on the braking system when the brake fluid level is 7mm above the "max" mark, using the actual vehicle installation angle as a reference. Following this, a fatigue durability test is performed at a specific frequency and number of cycles, ensuring no brake fluid leakage occurs throughout the entire test.

[0003] Existing testing equipment cannot simultaneously meet the requirements of angle increase and braking system pressurization during fatigue testing. This testing device was invented to solve the problem of brake leakage. Summary of the Invention

[0004] This invention provides a device for fatigue testing of brake fluid leakage in automotive reservoirs. The purpose is to observe the brake fluid leakage in the master cylinder reservoir assembly during or after a certain number of fatigue durability tests, thereby determining the reliability of the product.

[0005] The technical solution adopted in this invention consists of two parts: a mechanical structure and an electrical control system. The mechanical structure has a mounting base on which a swing cylinder seat and a swing bracket seat are connected. The swing cylinder is fixedly connected to the swing cylinder seat. The swing bracket is connected to both the swing bracket seat and the swing cylinder. The pressurizing cylinder and the specimen holder are fixedly connected to the swing bracket. The specimen holder is used to fix the main cylinder with canister assembly. The push rod of the pressurizing cylinder is connected to the main cylinder with canister assembly.

[0006] The electrical control section includes a power supply E, and connected to the power supply E are a pressure counter C1, a swing action counter C2, a pressure time relay KT1, a swing time relay KT2, an intermediate relay J1, an intermediate relay J2, and a power switch. The power supply E is equipped with a power switch. The pressure time relay KT1, through its internal normally open contact KT1, controls the coil of the intermediate relay J1 to conduct. After the intermediate relay J1 coil conducts, the first set of normally open contacts J1-1 of the intermediate relay J1 closes, the pressure counter C1 counts once, the second set of normally open contacts J1-2 of the intermediate relay J1 closes, the coil of the solenoid valve of the pressure cylinder 6 conducts, and the pressure cylinder 6 actuates. The pressure action is stopped by the normally closed contact C1-1 of the pressure counter C1, which is connected in series with the coil of the pressure cylinder 6. When the number of pressure actions reaches a set value, the normally closed contact C1-1 of the pressure counter C1 opens, the pressure cylinder coil is de-energized, and it stops actuating, thus completing the stop action.

[0007] When the normally open contact KT2-1 inside the swing time relay KT2 is energized, it controls the coil of the intermediate relay J2 to conduct. After the coil of the intermediate relay J2 is energized, the first set of normally open contacts J2-1 of the intermediate relay J2 is energized, the swing action counter C2 counts once, the second set of normally open contacts J2-2 of the intermediate relay J2 is energized, the coil of the solenoid valve of the swing cylinder 4 is energized, and the swing cylinder 4 actuates. To stop the swing action, the normally closed contact C2-1 of the swing action counter C2 is used. This normally closed contact C2-1 is connected in series with the coil of the swing cylinder 4. When the number of swing actions of the equipment reaches the set value, the normally closed contact C2-1 of the swing action counter C2 is opened, the coil of the swing cylinder 4 is de-energized, and the swing stops, thus completing the stop action.

[0008] Pressure sensors 9 are connected to the oil outlet of the main cylinder with tank assembly 8.

[0009] The advantages of this invention are its novel structure and the use of two control systems in a single workstation: a pressurization control system and a swing control system. The initial angle setting, termination angle setting, action frequency, and action time can be set independently for each system. It can perform tests under various road conditions, such as pressurizing before swinging, swinging before pressurizing, pressurizing and swinging simultaneously, or pressurizing or swinging only. The normally closed contact of the action counter is used to complete the end action of the entire test. The swing device and the pressurization device are controlled independently, which can simulate different road conditions for testing. It can effectively monitor whether there is any leakage of brake fluid in the product during the fatigue test, thereby judging the reliability of the product. Attached Figure Description

[0010] Figure 1 This is a schematic diagram of the mechanical structure of the present invention;

[0011] Figure 2 This is a schematic diagram of the electrical control section of the present invention. Detailed Implementation

[0012] like Figure 1 , 2 The test device consists of two parts: a mechanical structure and an electrical control system. It is a single-station test device. The mechanical structure is mounted on a base 1, which is connected to a swing cylinder seat 2 and a swing support seat 3. The swing cylinder 4 is fixedly connected to the swing cylinder seat 2. The swing support 5 is connected to the swing support seat 3 and the swing cylinder 4. The pressurizing cylinder 6 and the specimen fixing frame 7 are fixedly connected to the swing support 5. The specimen fixing frame 7 is used to fix the main cylinder with canister assembly 8. The push rod of the pressurizing cylinder 6 is connected to the main cylinder with canister assembly 8.

[0013] The electrical control section includes a power supply E, and connected to the power supply E are a pressure counter C1, a swing action counter C2, a pressure time relay KT1, a swing time relay KT2, an intermediate relay J1, an intermediate relay J2, and a power switch. The power supply E is equipped with a power switch. The pressure time relay KT1, through its internal normally open contact KT1, controls the coil of the intermediate relay J1 to conduct. After the intermediate relay J1 coil conducts, the first set of normally open contacts J1-1 of the intermediate relay J1 closes, the pressure counter C1 counts once, the second set of normally open contacts J1-2 of the intermediate relay J1 closes, the coil of the solenoid valve of the pressure cylinder 6 conducts, and the pressure cylinder 6 actuates. The pressure action is stopped by the normally closed contact C1-1 of the pressure counter C1, which is connected in series with the coil of the pressure cylinder 6. When the number of pressure actions reaches a set value, the normally closed contact C1-1 of the pressure counter C1 opens, the pressure cylinder coil is de-energized, and it stops actuating, thus completing the stop action.

[0014] When the normally open contact KT2-1 inside the swing time relay KT2 is energized, it controls the coil of the intermediate relay J2 to conduct. After the coil of the intermediate relay J2 is energized, the first set of normally open contacts J2-1 of the intermediate relay J2 is energized, the swing action counter C2 counts once, the second set of normally open contacts J2-2 of the intermediate relay J2 is energized, the coil of the solenoid valve of the swing cylinder 4 is energized, and the swing cylinder 4 actuates. To stop the swing action, the normally closed contact C2-1 of the swing action counter C2 is used. This normally closed contact C2-1 is connected in series with the coil of the swing cylinder 4. When the number of swing actions of the equipment reaches the set value, the normally closed contact C2-1 of the swing action counter C2 is opened, the coil of the swing cylinder 4 is de-energized, and the swing stops, thus completing the stop action.

[0015] Pressure sensors 9 are connected to the oil outlet of the main cylinder with tank assembly 8.

[0016] The operating steps of this invention experiment are as follows:

[0017] The first step is to adjust the distance and height of the swing bracket 5 to achieve the initial angle for the product testing process;

[0018] The second step is to install the main cylinder and canister assembly 8 products onto the swing bracket 5 at the initial installation angle;

[0019] The third step is to manually operate the swing motion to confirm that the initial and final angles of the test meet the test requirements.

[0020] The fourth step is to connect pressure sensors 9 to the brake master cylinder outlet. The two pressure sensors are connected to the digital instrument in the control box via signal lines. Brake fluid is added to the master cylinder tank assembly, and the master cylinder tank assembly is manually bleeded. After bleeding, brake fluid is added to the master cylinder tank assembly to the MAX level.

[0021] The fifth step is to set the time and operating frequency of the pressurization cylinder 6;

[0022] Step 6: Set the pressure counter C1;

[0023] The seventh step is to adjust the output pressure of the main cylinder with canister assembly by adjusting the intake pressure of the pressurizing cylinder 6. The hydraulic pressure of the first chamber and the hydraulic pressure of the second chamber can be displayed on the control box.

[0024] Step 8 begins the test. The pressurizing cylinder 6 completes one cycle of advancement and retraction, and the pressurizing counter C1 records one cycle. The pressurizing device adjustment is complete.

[0025] Step 9: Set the timing and frequency of the swing cylinder 4.

[0026] Step 10: Set the swing action counter C2 and start the swing cylinder. It can be pressurized first and then swing, or swing first and then pressurized, or pressurized or swinged separately. The start and stop times of the pressurizing cylinder and the swing cylinder can be adjusted according to the test requirements to achieve different test results under different road conditions.

[0027] The working principle is explained in detail below:

[0028] First, let's explain the pressurization action control. When the system is powered on, the pressurization counter C1 is set to count, and then the pressurization time relay KT1 is set to set the activation and deactivation times to control the pressurization frequency of the entire equipment. When the normally open contact KT1-1 inside the pressurization time relay KT1 is activated, it controls the coil of the intermediate relay J1 to conduct. After the coil of the intermediate relay J1 is activated, the first set of normally open contacts J1-1 of the intermediate relay J1 is activated, the pressurization counter C1 counts once, the second set of normally open contacts J1-2 of the intermediate relay J1 is activated, the coil of the solenoid valve of the pressurization cylinder 6 is activated, and the pressurization cylinder 6 is activated.

[0029] The pressurization action is stopped by using the normally closed contact C1-1 of the pressurization counter C1. This normally closed contact C1-1 is connected in series with the coil of the pressurization cylinder 6. When the number of pressurization actions of the equipment reaches the set value, the normally closed contact C1-1 of the pressurization counter C1 opens, the coil of the pressurization cylinder 6 is de-energized and stops operating, and the equipment completes the stop action.

[0030] The swing cylinder 4 control instructions are as follows: First, set the swing action counter C2 to count the number of swing actions. Then, set the activation and deactivation times of the swing time relay KT2 to control the swing action frequency of the entire device. When the normally open contact KT2-1 inside the swing time relay KT2 is activated, it controls the coil of the intermediate relay J2 to conduct. After the coil of the intermediate relay J2 is activated, the first set of normally open contacts J2-1 of the intermediate relay J2 is activated, the swing action counter C2 counts once, the second set of normally open contacts J2-2 of the intermediate relay J2 is activated, the coil of the solenoid valve of the swing cylinder 4 is activated, and the swing cylinder 4 operates.

[0031] The swing action is stopped by using the normally closed contact C2-1 of the swing action counter C2. This normally closed contact C2-1 is connected in series with the coil of the swing cylinder 4. When the number of swing actions of the equipment reaches the set value, the normally closed contact C2-1 of the swing action counter C2 opens, the coil of the swing cylinder 4 is de-energized and stops moving, and the equipment completes the stop action.

[0032] Turning off the power switch is the function of the entire electrical control system.

Claims

1. An apparatus for fatigue testing of brake fluid leakage in automotive reservoirs, characterized in that: It consists of two parts: mechanical structure and electrical control. The mechanical structure has a mounting base on which a swing cylinder seat and a swing bracket seat are connected. The swing cylinder is fixedly connected to the swing cylinder seat. The swing bracket is connected to both the swing bracket seat and the swing cylinder. The pressurizing cylinder and the specimen holder are fixedly connected to the swing bracket. The specimen holder is used to fix the main cylinder with canister assembly. The push rod of the pressurizing cylinder is connected to the main cylinder with canister assembly. The electrical control section includes a power supply E, and connected to the power supply E are a pressure counter C1, a swing action counter C2, a pressure time relay KT1, a swing time relay KT2, an intermediate relay J1, an intermediate relay J2, and a power switch. The power supply E is equipped with a power switch. The pressure time relay KT1, through its internal normally open contact KT1, controls the coil of the intermediate relay J1 to conduct. After the intermediate relay J1 coil conducts, the first set of normally open contacts J1-1 of the intermediate relay J1 closes, the pressure counter C1 counts once, the second set of normally open contacts J1-2 of the intermediate relay J1 closes, the coil of the pressure cylinder solenoid valve conducts, and the pressure cylinder actuates. The pressure action is stopped by the normally closed contact C1-1 of the pressure counter C1, which is connected in series with the pressure cylinder coil. When the number of pressure actions reaches a set value, the normally closed contact C1-1 of the pressure counter C1 opens, the pressure cylinder coil is de-energized, and it stops actuating, thus completing the stop action. When the normally open contact KT2-1 inside the swing time relay KT2 is energized, it controls the coil of the intermediate relay J2 to conduct. After the coil of the intermediate relay J2 is energized, the first set of normally open contacts J2-1 of the intermediate relay J2 is energized, the swing action counter C2 counts once, the second set of normally open contacts J2-2 of the intermediate relay J2 is energized, the coil of the swing cylinder solenoid valve is energized, and the swing cylinder actuates. To stop the swing action, the normally closed contact C2-1 of the swing action counter C2 is used. This normally closed contact C2-1 is connected in series with the swing cylinder coil. When the number of swing actions of the equipment reaches the set value, the normally closed contact C2-1 of the swing action counter C2 is opened, the swing cylinder coil is de-energized, and the swing stops, thus completing the stop action.

2. The apparatus for fatigue testing of brake fluid leakage in an automotive reservoir according to claim 1, characterized in that: Pressure sensors are connected to the oil outlet of the main cylinder with tank assembly.

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