Cover assembly cuts build time and avoids leaks
A
Minnesota Rubber and Plastics product story
Edited by the Engineeringtalk editorial team
May 23, 2002
Eliminating leaks in hydrostatic pump controllers is made possible with a pressure tested cover assembly of six components from Minnesota Rubber/QMR Plastics.
Eliminating leaks in hydrostatic pump controllers is made possible with a pressure tested cover assembly of six components from Minnesota Rubber/QMR Plastics.
Used in off-highway equipment such as curb formers and skid steerers, these cover assemblies include an integral control lever, actuating spring, and elastomer face seal.
By managing the entire manufacturing, assembly and testing process, this six-piece component subassembly allowed the OEM to reduce costs and the number of vendors it worked with.
During operation, the hydrostatic pump control body contains dampening fluid that stabilises internal valve components.
Hydraulic pressure is regulated by electrical input that generates and releases pressure from one side to the other.
The cover assembly is important to the pump s operation because the attached actuating reset lever assembly must operate and still confine the fluid.
These cover assemblies are designed of materials to handle the effects of the dampening fluid under pressure and to withstand varying humidity and temperature changes.
QMR Plastics assembles the actuator, lever, O-ring and spring and then ultrasonically welds them into position.
Each completed cover assembly is leak-tested to a specified PSI for unwanted pressure decay.
When delivered to the customer, the assembly easily mounts face seal down to the pressure control pilot valve with electrical connections made through a round opening in the cover wall.
Originally, the six individual components were supplied by several other suppliers, reports Rich Leiendecker, Market Development Manager of assemblies for Minnesota Rubber/QMR Plastics.
"We resolved on-going functional issues, and by consolidating all manufacturing, assembly and testing, we helped reduce our customers part management and assembly time in addition to helping free-up their assembly floor space for more important manufacturing operations".
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