Measuring and testing – Internal combustion engine or related engine system or... – Compression
Patent
1990-07-12
1991-12-03
Raevis, Robert
Measuring and testing
Internal combustion engine or related engine system or...
Compression
G01M 1500
Patent
active
050690647
ABSTRACT:
A spring seat assembly including a magnet generating a magnetic field in a fuel injection element such as a needle valve in fuel injection apparatus in an internal combustion engine equipped with a needle lift sensor. A magnet is attached to a cap of a nonmagnetic material, preferably stainless steel. The cap has a rim extending in between the injector spring and the spring seat and centering itself on the spring seat with a further cylindrical extension. The cap centers itself in the spring and centers with its cylindrical extension the spring seat as well. Since the cap is held with its rim securely between spring seat and spring due to the spring force and the acceleration forces on the spring seat, cap and magnet cannot separate from the spring seat. A suitable epoxy is used to secure the magnet and the cap and may also be used to hold the entire assembly together while not installed in the injector. Alternatively, the cap and the magnet may be brazed together.
REFERENCES:
patent: 3412602 (1968-11-01), Rush et al.
patent: 4366706 (1983-01-01), Wolff
patent: 4386522 (1983-06-01), Wolff
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