Self-lubricating oilless bushes

Graphite plugged bronze bushings

The structure of self-lubricating bearing is based on high strength copper alloy, on which a number of through holes or blind holes are uniformly distributed, and the holes are filled with solid lubricant. At the same time, the surface of the bearing friction layer is also coated with solid lubrication film to help the running.

Maintenance Free &  Self-lubricating

• Excellent friction and wear properties

• Low friction coefficient

• High bearing capacity

In particular, the matrix material used for graphite bearings is a special formula copper alloy, whose yield strength reaches 520MPa, hardness reaches 200HB, and it has a strong bearing capacity.The material can still be used when other copper alloy materials can not meet the requirements under heavy loads, and the friction reduction performance is also outstanding.

1. No oil lubrication or less oil lubrication, suitable for refueling or difficult to refueling places, can be used in no maintenance or less maintenance;
2. Good wear resistance, small friction coefficient, long service life;
3. Have the right amount of elastoplastic, can distribute the stress on the wider contact surface, improve the bearing capacity;
4. The static and dynamic friction coefficient is similar, which can eliminate the creep at low speed, so as to ensure the working accuracy of the machine;
5. Can make the machinery to reduce vibration, reduce noise, prevent pollution, improve working conditions;
6. Transfer film can be formed during operation to protect the grinding shaft, without shaft biting phenomenon;
7. For grinding shaft hardness requirements are low, the shaft without conditioning can be used, thus reducing the processing difficulty of related parts;
8. Thin wall structure, light weight, can reduce the mechanical volume;
9. The bushing material is brass, can be used in corrosive media.

In order to solve the mechanical equipment in high temperature, low speed, heavy load, dust, water and impact vibration lubrication problems, choose oil-free self-lubricating bearings.

1. Self-lubricating bearings are developed on the metal friction surface of the bearing matrix with holes arranged in order and of appropriate size, and embedded with molybdenum disulfide and graphite to make composite self-lubricating blocks embedded on the metal sleeve. The composite bearings are made of solid lubricant friction area of 25-65%.The solid self-lubricating block can work normally at a high temperature of 280℃.But because of its low mechanical strength, weak bearing capacity, easy to produce deformation, it is embedded in the metal hole groove can suppress this shortcoming, the formation of the metal part plays a bearing role, the self-lubricating block plays a lubrication role.The lubrication mechanism of this self-lubricating bearing is that in the sliding friction process between the shaft and the sleeve, part of the self-lubricating material molecules transfer to the metal surface of the shaft, fill up the small non-plane, and form a layer of stable solid lubrication film, resulting in the grinding between the solid lubrication film, to prevent the adhesion of the shaft and the sleeve wear.This rational combination combines the complementary advantages of copper alloy and non-metal anti-wear materials, especially suitable for no oil, high temperature, high load, low speed, anti-fouling, anti-corrosion, strong radiation environment, as well as in water or other solution infiltration and cannot add lubricating oil special working conditions.
2. The proportion of the self-lubricating block to the area of the self-lubricating block is related to the running speed and the bearing strength, and the running speed is low.The bearing strength is large, the area occupied by the metal should be larger.Such as the ingot trolley walking wheel bearing self-lubricating block occupies about 25% of the area, spindle bearing drawing mechanism lubrication should be sufficient, the compressive strength is not large, self-lubricating block occupies about 65% of the area.
3. Technical requirements for bushing materials bushing should be made of alloy copper, bushing to have a higher hardness, generally must be heat treatment, the hardness is not less than HRC45.
4. Geometric shape and Mosaic requirements of self-lubricating plate
   The shape of the self-lubricating plate is cylindrical and rectangular. The self-lubricating plate can be cylindrical according to the size of the occupied area, and the rectangular shape can be used otherwise.No matter what shape must be inlaid firmly, in case of falling off in operation.
5. The linear expansion coefficient of the self-lubricating block is about 10 times that of steel.In order to adapt to the bearing temperature change, the clearance between the shaft and the bushing is increased from 0.032 ~ 0.15mm to 0.45 ~ 0.5mm with the original four-stage moving fit of the metal parts (D4 / DC4).The self-lubricating block protruded the bushing metal 0.2 ~ 0.4mm on one side of the friction pair.In this way, the initial running-in period of bearing operation will be fully lubricated, and the consumption of power driving power will be reduced.

Self-lubricating oilless bearings are suitable for a wide variety of applications

The products have been widely used in such industries as hydraulic generator, wind turbine generator, hydraulic gate, turbine generator, petroleum machinery, metallurgical equipment, lifting and transportation, etc.