Multilayer Bearing

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DP4 & DP4-B Dry Bush Bearing

Maximum sliding speed, U:: 5.0m/s
Maximum Operating Temperature Tmax:: 280 °C
Minimum Operating Temperature Tmin:: -200 °C
Maximum pU factor:: 1.0N/mm² x m/s
Coefficient of friction:: 0.04 - 0.25 *

Specifications
Technical Data
Inquiry

■ Specifications

Metal-Polymer Self-lubricating Lead Free Bearing Solutions

DP4 = steel backing

DP4-B = bronze backing

The DP4 and DP4B materials offer the following characteristics:

• Good frictional properties with negligible stick-slip

• High static and dynamic load capacity

• Suitable for rotating, oscillating, reciprocating and sliding movements

• Compact size and low weight

• Pre-finished that requires no machining after assembly

• Possibility to burnish for reduced operating clearance

• No water absorption and therefore dimensionally stable

• Suitable for a wide operating temperature range from -200 to +280 °C

• DP4B with bronze backing for increased corrosion resistance

• Lead free in compliance with European RoHS 2002/95/EC, 2002/96/EC and EVL 2000/53/EC directives

■ Technical Data

In particular, depending on the dry running conditions, DP4 and DP4B materials present the following performance advantages:

Dry conditions

• Good friction and wear performance under light duty conditions

• Particularly suitable for intermittent oscillating and reciprocating movements

• Maintenance free as no external lubrication required

• Seizure resistant.

Lubricated conditions

• Good wear and friction performance over a wide range of load, speed and temperature conditions

• High wear resistance in boundary operating conditions

• High resistance of bearing surface under fluid cavitation and flow erosion conditions

• Suitable for operation in diverse fluids (oil, fuel, solvents, refrigerants, water).

Structure and Composition

DP4 is a composite bearing material. It consists of a steel DP4

/ bronze DP4B backing to which is bonded a porous sintered bronze inter-layer which is overlaid and impregnated with Polytetrafluoroethylene (PTFE) containing a mixture of inorganic fillers and special polymer fibres.

BEARING PROPERTIES

DRY
Maximum sliding speed, U	m/s	2.5
Maximum pU factor	N/mm² x m/s	1.0
Coefficient of friction		0.04 - 0.25 *

OIL LUBRICATED
Maximum sliding speed, U	m/s	5.0
Maximum pU factor	N/mm² x m/s	10.0
Coefficient of friction		0.02 - 0.08 *

RECOMMENDATIONS

Shaft surface roughness, Ra

Dry

Lubricated

µm

0.3 - 0.5

≤ 0.05 - 0.40 *

Shaft surface hardness

Unhardened acceptable, improved bearing life > 200HB

* Depending on operating conditions

Basic Forms

• Cylindrical Bushes

• Flanged Bushes

• Thrust Washers

• Flanged Washers

• Strip Material

Applications

Given the performance characteristics in both dry and lubricated operating conditions, DP4 and DP4B bearing materials are extensively used in a wide range of automotive and industrial applications, such as:

Automotive

Braking systems, clutches, gearbox and transmissions, hinges - door bonnet and boot, convertible roof tops, pedal systems, pumps - axial, radial, gear and vane, seat mechanisms, steering systems, struts and shock absorber, wiper systems.

gear-box

IFG8R

slider-home

gorman-gear-pumps-large

Industrial

Aerospace, agricultural, construction equipment, food and beverage, marine, material handling, office equipment, packaging equipment, pneumatic and hydraulic cylinders, railroad and tramways, textile machinery, valves.

related case：
http://www.slide-bearing.com/news/export-red-ptfe(teflon)-dp4-bushing-europe.html
http://www.slide-bearing.com/news/export-13000pcs-dp4-oilless-dry-bushings-to-indonesia.html

■ Inquiry

sales@slide-bearing.com+86 731 84770165