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One Piece V-Cup Seal By Minnesota Rubber & Plastics Replaces Two Part Assembly Reducing Part Cost And Assembly Time

Minneapolis, Minnesota: Combining two components into a single part while maintaining part function and life was accomplished by Minnesota Rubber & Plastics with a redesigned piston V-cup seal. Used in outboard motor fuel assemblies, these new seals provide improved seal life while reducing manufacturing and assembly costs.

The original two-part design was functionally satisfactory but overly complicated by today’s standards. The two components acted as a horizontal dynamic piston seal with the sealing function occurring for pressure traveling in either direction – in and out. Two parts were stacked, back-to-back to accomplish this bi-directional sealing process. This seal worked well enough without trapping pressure between the seal surfaces. However, the assembly process to achieve the seal consistency was labor intensive, requiring skillful part handling and placement as well as special testing.

In a joint customer/supplier program, Minnesota Rubber & Plastics brought to bear its six decades of experience with fluid sealing applications in harsh operating environments. Minnesota Rubber developed a new, single V-cup seal design which simplified and speeded up the assembly process, resulting in improved efficiencies, reduced labor content and lower costs.

Minnesota Rubber & Plastics' material selection for this seal was also critical to the success of the single part design. A special fuel resistant fluoroelastomer material was formulated so that the part would withstand the harshness of extended fuels. In addition to providing the needed fuel resistance, the fluoroelastomer provided excellent flex fatigue resistance, excellent compression set and most important, lower cost.

Produced in high speed, automated molding presses, just-in-time volume requirements were met while the new, single part cost was 23 percent less than the previous two part assembly. Delivery time was shortened while part quality and repeatability was enhanced because of the one-piece design.