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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 Dorman Products
Rear Crankshaft Oil Seal Installer - 635-000 #automobile #technician #gm #carrepair
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By tressorpsp
Item number:
link hidden, please login to view Condition: The item is in very good condition, the rims may occasionally show minimal signs of use. The rims were prepared at the rim edge, see photos. Rims : 7.5 x 18 ET 44 | 8.5 x 18 ET 56 Part number: A2054014600 | A2054014700 (black high-sheen) Tire manufacturer: Michelin Pilot Alpin PA4 winter tires MO Wheel size: 225/45 R18 95V DOT: 0620 | 245/40 R18 97V DOT: 4119 Profile depth approx.: 8mm | 8mm (New tires are usually 8 mm) Suitable for snow chains: Yes Vehicle Models: link hidden, please login to view W205, S205, C205 & A205 Sedan T-Model Coupe link hidden, please login to view Scope of delivery: 4x rims + 4x tires mounted. with TPMS sensors, without wheel rim covers shown (brand link hidden, please login to view)
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By Counterman
The AAM Group honored Tri-State Enterprises as its 2022 Member of the Year at the organization’s annual Membership Meeting held May 10-12 in Frisco, Texas.
Each year AAM makes this selection based on five key metrics: Active Participation; Growth as a Percentage; Marketing Participation; Participation in Group Buys; and PRO Rebates Participation. In recognition of its win,
link hidden, please login to view received a custom trophy and an exclusive painting commissioned from automotive artist Jim Caswell. “I’m so proud of the Tri-State team for all their hard work and dedication,” said Tri-State Enterprises owner and President Tristan Taylor. “To once again be chosen out of a great lineup of members is truly a privilege and an honor. The AAM Group is a big part of our overall success, along with a host of supplier partners. Our motto is ‘People Driven,’ and we would not be the company we are today without the support of all our partners. Thank you!”
“In a year when so many members contributed so much value, Tri-State demonstrated tremendous support for our supplier partners, edging out many deserving members to earn this year’s coveted award,” AAM President Tim Odom said. “This win puts Tri-State in the rare category of back-to-back Member of the Year honorees.”
The AAM meeting also saw awards given to the winners in each of the aforementioned individual categories. Recipients included Midwest Wheel and Midstates, Inc. (Active Participation); Alamo Auto Supply (Growth as a Percentage); Dix Performance (Marketing Participation); overall winner Tri-State Enterprises (Participation in Group Buys); and AllPro Distributing (PRO Rebates Participation).
Automotive Accessories Marketing USA Inc. (The AAM Group) is the largest distribution group in the Specialty Equipment Market Association (SEMA) marketplace.
link hidden, please login to view now includes 21 member-companies operating 68 distribution centers throughout North America. The post
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