September 13, 2017
GGB to Present Paper, Exhibit at HYDRO 2017
GGB Bearing Technology principal engineer for tribological materials Michael Kim will present a...
From September 25, 2017 to September 27, 2017
CTI Symposium China
Visit us at stand #46
From October 9, 2017 to October 13, 2017
MSV Brno 2017
Visit us at hall V, stand 125
Get in touch with our experts
Oil & Gas
Increase Service Life
Replace Roller Bearings
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Engineered Plastics Bearings
Fiber Reinforced Composite Bearings
Bushing Blocks and Thrust Plates
Metal and Bimetal Bearings
AT A GLANCE
Rotary vane pumps produce hydraulic power for automatic transmissions.
Located in the cover of the transmission, they pull oil at low pressure from a sump in the bottom of the transmission and feed it at high pressure to the hydraulic system, transmission cooler and torque converter.
The vane rotor is supported by bearings at the front and back plates.
When mounted in the back plate, needle roller bearings can fail due to oil starvation, particularly after long periods of rest in different climatic conditions or during repeated stop-start operation.
To improve pump reliability, GGB DP4 metal polymer cylindrical bearings underwent trials to determine the feasibility of replacing the needle roller bearings.
The rigorous, extensive testing program included operation at full pump power and different engine regimes from 500 to 7 000 rpm under boundary, mixed and hydrodynamic lubrication, stop/start operation and oil starvation.
The results of these tests confirmed that the metal polymer composite cylindrical bushings provide superior pump reliability thanks to their excellent tribological performance of under dry, marginal and hydrodynamic lubricated operating conditions.
The benefits offered by GGB DP4 self-lubricating cylindrical bearings are the following:
Boot, Bonnet and Door Hinges
Shock Absorbers and Struts
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