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Common terminology in the grease industry 3

2020-05-15 14:55:58

Oil circuit board (Manifold of Metering Device, or Distribution Manifold) The part of the distributor that diverts the lubricant or fixes the oil feeder

The single-line distributor (Metering Device With Injectors) is a distributor composed of an oil circuit board and one or several single-line oil feeders. All parts can also be combined into one assembly


Tribology is the theoretical and practical science and technology that studies dual surfaces interacting in relative motion.

Friction is the phenomenon that hinders the tangential relative motion of the contacting surfaces of two objects. Friction is also often used to express frictional force.

When the surface of the wear object moves relative to the surface, the material on the working surface is continuously lost or residual deformation occurs. The wear process occurs mainly due to mechanical, chemical and thermal interactions between the dual surfaces.

Lubrication The use of lubricants to reduce friction and wear or other forms of surface damage between two friction surfaces.

Tribophysics is the branch of physics that studies interacting surfaces in relative motion.

Tribomechanics is a branch of mechanics that studies the microscopic and ultramicroscopic processes of solids under the influence of mechanical energy.

Tribochemistry is the branch of chemistry that studies the reactions in which friction regions of surfaces in relative motion cause mechanical, physical and chemical changes in dual surface layers. Tribochemistry focuses on those chemical reactions that study the chemical interactions of lubricant components with the friction surface.

The friction pair (Rubbing Pair) makes the two components contact each other and have a connection with relative movement.

External friction is the same as friction.

Internal Friction Friction caused by relative displacement between parts of the same object.

Static friction refers to the friction between two objects under the action of external force that produces microscopic pre-displacement, that is, elastic deformation and plastic deformation, but has not yet occurred relative motion. The static friction at the moment when the relative motion is about to start is called the limit static friction and the maximum static friction, and the friction coefficient at this time is called the static friction coefficient. .

Kinetic Friction (Dynamic Friction) Friction between two surfaces in relative motion. The coefficient of friction at this time is called the coefficient of kinetic friction.

The coefficient of friction is the ratio of the frictional force that hinders the relative motion of two objects to the normal force compressing the two objects

Sliding Friction The friction between two contacting objects with different velocities and/or directions.

Rolling Friction The friction between two objects in contact with the same speed and direction.

Spin friction is the friction between two contacting objects rotating relative to each other around the normal to the contact surface.

Dry Friction Friction between two objects in the nominal absence of any form of lubricant. Strictly speaking, there are no other media such as moisture and natural sources of contamination on the contact surface during dry rubbing.

Boundary Friction (Boundary Friction) The friction and wear characteristics between two solid surfaces in relative motion are mainly determined by the surface properties and the boundary lubricant properties of the extremely thin layer, and the friction conditions have little to do with the bulk viscosity characteristics of the lubricant film. .

Fluid friction is the friction when two solid surfaces that are in relative motion are completely separated by a liquid lubricant with bulk viscosity characteristics, that is, the friction caused by the viscous resistance or rheological resistance of the liquid.

Lubricated Friction is friction between two solid rubbing surfaces with the presence of any form of lubricant.

Mixed Friction is the friction under the mixed condition of dry friction, boundary friction or fluid friction, also known as semi-dry friction or semi-fluid friction, between the friction surfaces of two solids.

Unlubricated friction is friction between two solid friction surfaces without any form of lubricant, but not necessarily in a completely dry condition.


"Crawling" (Stick-Slip) is also known as stick-slip. It refers to the phenomenon of uneven movement of the friction pair that is in relative motion when its driving speed and load remain constant. Also known as "stick-slip" phenomenon. The friction force of "crawling" has the characteristic of decreasing with the increase of the movement speed, and the alternating friction force that maintains the self-vibration is generated by the connection between the vibration speed and the movement speed.

Friction Duty is the specification of parameters such as load, speed, ambient temperature medium, and surface state when the friction pair is in relative motion. working condition