Clutch test standard.
1. Clutch test method
The clutch test can be divided into the following test methods according to different execution standards:
1. Single condition test method: mainly includes friction overheating test, wear test, coasting test, starting quality test and durability test.
2. Comprehensive condition test method: mainly includes thermal stability test, fatigue test, low wear test, high temperature life test and limit condition test.
Second, clutch test index
The clutch test index is the key index to measure the clutch performance, mainly including the following aspects:
1. Braking force and brake pedal travel
2. The total bearing capacity of the clutch and the working height of the pressure plate
3. Friction plate wear and durability
4. Thermal performance and temperature rise of clutch housing
5. Shock absorption and mute performance of the clutch
The clutch working cylinder, also known as the clutch master pump, is an important part of the clutch system, its main function is to transfer hydraulic pressure to control the engagement and disengagement of the clutch. Here's how it works:
When the driver depresses the clutch pedal, the push rod pushes the master cylinder piston, causing the oil pressure to rise.
This allows the brake fluid to be fed through the hose to the clutch working cylinder.
In the working cylinder, pressure acts on the separating fork, causing it to move.
The disengaging fork then pushes the disengaging bearing to disengage the clutch.
When the driver releases the clutch pedal, the hydraulic pressure is released, the separation fork gradually returns to its original position under the action of the return spring, and the clutch reengages.
In addition, when the clutch pedal is not pressed, there is a gap between the master cylinder push rod and the master pump piston, and there is a small gap between the oil inlet valve and the piston due to the limit screw on the oil inlet valve. In this way, the oil storage cylinder is communicated with the left chamber of the main pump through the pipe joint and the oil passage, the oil inlet valve and the oil inlet valve. When the clutch pedal is pressed, the piston moves to the left, and the oil inlet valve moves to the right relative to the piston under the action of the return spring, eliminating the gap between the oil inlet valve and the piston. Continue to press the clutch pedal, the oil pressure in the left chamber of the master pump rises, the brake fluid in the left chamber of the master pump enters the booster through the tubing, the booster works, and the clutch is separated. When the clutch pedal is released, the piston moves rapidly to the right under the action of the same spring, because the brake fluid flows in the pipeline has a certain resistance, and the flow back to the main pump is slow, so a certain vacuum degree is formed in the left chamber of the main pump, the oil inlet valve moves left under the pressure difference between the left and right oil chamber of the piston, and the oil storage cylinder has a small amount of brake fluid flowing into the left chamber of the main pump through the oil inlet valve to make up for the vacuum. When the brake fluid originally entered the booster by the main pump flows back to the main pump, there is excess brake fluid in the left chamber of the main pump, and this excess brake fluid will flow back to the oil storage cylinder through the oil inlet valve.
Clutch is one of the key transmission parts in automobile, and its good quality directly affects the performance and safety of automobile. Understanding the clutch test standards and indicators can effectively improve the quality and stability of clutch products and occupy a place in the market competition. At the same time, actively participating in the formulation and compliance with relevant standards is also the only way for enterprises to research and develop and produce high-quality products.
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