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What is an automobile shock absorber?
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By 袁春凤 (Tiffany)
The phenomenon that two objects move relative to each other to produce motion resistance between their contact surfaces is called friction, which is called friction. The existence of friction not only increases the power consumption, but also causes the wear of parts' contact surfaces. Therefore, lubricating oil is usually used between the relative moving surfaces of automobile parts to reduce friction. Failure of automotive parts 75% is caused by friction.
Friction can be divided into dry friction, liquid friction, boundary friction and mixed friction according to the lubrication state of the parts.
(1) dry friction
The friction between the frictional surfaces without any lubricating medium is called dry friction.
When the parts are in the state of dry friction, the surface of the parts is abraded sharply, so the surface of the moving parts of the automobile should avoid the occurrence of dry friction as far as possible.
Dry friction and boundary friction are the main friction between the upper part of cylinder wall and piston ring. Dry friction will occur when the journal and bearing are subjected to impact load in the working process.
(2) liquid friction
Two the friction of the friction surface when the lubricant is completely separated is called liquid friction.
In liquid friction, the two friction surfaces are completely separated by a layer of lubricating oil film with a thickness of 1.5-2.0um, which avoids direct contact between the working surfaces of the two parts. Friction only occurs between the lubricating fluid molecules, so the friction resistance is very small, and the wear of the parts is very slight.
Most of the relative motion parts of a car are carried out under the condition of liquid friction (for example, crankshaft and bearing).
(3) boundary friction
Two friction surface separated by a very thin boundary film is called boundary friction.
The oil film thickness is usually below 0.1um. Friction only occurs between the outer molecules of the boundary film, reducing the friction and wear of the parts. But its thickness is very small, and it is easy to be destroyed by impact and high temperature, so it is not as reliable as liquid friction.
For example: between cylinder wall and piston ring; if the work crankshaft and journal between the insufficient supply of lubricant, easy to produce boundary friction.
(4) Mixed friction
The friction between two friction surfaces in the presence of dry friction, liquid friction and boundary friction is called mixed friction.
In the actual working state, the parts usually work under the mixed friction state, and the friction state varies with the working conditions.
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By Counterman
ZF Aftermarket announced the launch of 33 new part numbers in March for SACHS Continuous Damping Control (CDC) shock absorbers for approximately 1.6 million passenger vehicles in operation in the U.S. and Canada (USC). The new products expand ZF’s line of SACHS CDC shock absorbers by more than 70 percent, reflecting growing demand for advanced damping technology in the aftermarket, according to ZF.
The CDC part numbers cover a variety of BMW and Audi models, among others. The CDC electronic damper system has been in large-scale original equipment production since the mid-2000s and is offered for many vehicles, from luxury cars to SUVs to compact cars. ZF said it has produced more than 35 million CDC dampers globally and plans to release additional CDC part numbers in the USC region throughout 2024.
“Demand for continuous damping control shocks is skyrocketing in the USC aftermarket, so we’re very excited to deliver more of this advanced damping technology to our customers, and to continue building the SACHS CDC product line,” said Mark Cali, head of independent aftermarket, USC for ZF Aftermarket.
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By OReilly Auto Parts
Automotive Shock and Strut Overview | What do they do and why are they important?
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By Dorman Products
Rear Crankshaft Oil Seal Installer - 635-000 #automobile #technician #gm #carrepair
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