High-pressure oil rail sealing system and method
AssigneeCSC Diesel
InventorJoshua Smith
Life of this patent
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Abstract
The present disclosure provides a sealing system for a high-pressure-oil (HPO) rail, comprising a transition-fit fluid joint omitting any elastomeric seal, and an anaerobic adhesive as a primary sealing medium in the fluid joint. The transition-fit fluid joint maintains a radial transition of 0.0025-0.001 inch across production rail bores. The anaerobic adhesive is a one-part anaerobic adhesive, such as Loctite 680. The sealing system is configured to retrofit existing engines without modifying the rail casting and comprises a machined standpipe and dummy plug designed to withstand pressures greater than 3,500 psi and high-frequency vibration without leakage.
Claims21
1-23. (canceled)
A sealing system for a high-pressure-oil (HPO) rail of an internal combustion engine, comprising:
- a machined assembly configured to form a continuous fluid pathway through the HPO rail, the machined assembly comprising a standpipe head, a standpipe plug, and a standpipe;
- a transition-fit fluid joint formed between the machined assembly and a bore of the HPO rail, the transition-fit fluid joint omitting any elastomeric seal and maintaining a radial clearance of 0.00025 to 0.001 inch;
- and an anaerobic adhesive disposed in the transition-fit fluid joint as a primary sealing medium to seal residual micro-clearance between the machined assembly and the bore.
A dummy plug for sealing an unused bore of a high-pressure-oil (HPO) rail of an internal combustion engine, comprising:
- a solid, monolithic plug body having an upper end and a lower end, the plug body being free of any groove for receiving an elastomeric seal;
- an upper bevel formed at the upper end;
- and
- a lower bevel formed at the lower end, wherein the upper bevel and the lower bevel define tapered transition regions that accommodate thermal expansion of the plug body within the bore while maintaining a transition fit that prevents fluid leakage without an elastomeric seal, and wherein the transition fit maintains a radial clearance of 0.00025 to 0.001 inch with the bore.
A method of converting an O-ring-sealed high-pressure-oil (HPO) rail to an O-ring-less configuration, comprising:
- applying an anaerobic adhesive to outer surfaces of a machined standpipe assembly and a dummy plug, the machined standpipe assembly comprising a standpipe head, a standpipe plug, and a standpipe;
- and installing the machined standpipe assembly and the dummy plug into the bore to create a transition fit maintaining a radial clearance of 0.00025 to 0.001 inch, the transition fit omitting any elastomeric seal and using the anaerobic adhesive to seal residual micro-clearance in a resulting joint.
A retrofit kit for converting an O-ring-sealed high-pressure-oil (HPO) rail to an O-ring-less configuration, comprising:
- a machined standpipe assembly comprising a standpipe head, a standpipe plug, and a standpipe, the machined standpipe assembly configured to create a transition fit with an existing bore of the HPO rail, the transition fit maintaining a radial clearance of 0.00025 to 0.001 inch;
- a dummy plug comprising a solid plug body with an upper bevel and a lower bevel;
- and
- a sealant capsule containing an anaerobic adhesive configured for application to the machined standpipe assembly and the dummy plug prior to installation into the bore.
Dependencies are inferred from the claim text.