Fuel Injector Pressure Sensor Insulation Stop Area

The patent applies preliminary anti-action by providing a stop area on the spring element that prevents axial movement towards the housing before thermal stress can cause loss of contact. The stop area is positioned to limit the axial displacement of the spring element, thereby preemptively counteracting the harmful relative movement that would otherwise occur under temperature cycling and axial force stress, maintaining stable electrical contact.

The insulating mass serves as an intermediary element between the spring element and the housing. It provides both electrical insulation and mechanical support, allowing the spring element to be electrically isolated from the housing while still providing a defined stop position. This intermediary structure enables the spring element to maintain stable contact with the piezoelectric element without direct contact with the housing, preventing short circuits while maintaining contact stability.

The stop area on the spring element provides preliminary anti-action by limiting axial movement before thermal stress on the insulating material can cause the spring element to shift position. By pre-defining the maximum axial displacement, the design prevents the insulating material from experiencing excessive thermal stress that would lead to loss of electrical contact, maintaining reliable insulation and contact under high temperature conditions.

The patent changes the geometric parameters of the spring element by adding a stop area with a cross-section larger than the through-opening. This parameter change creates a mechanical constraint that alters the thermal stress distribution in the insulating material, preventing the spring element from moving due to thermal expansion or contraction, thereby maintaining stable electrical insulation and contact under temperature cycling.

The stop area provides preliminary anti-action by pre-limiting the axial movement of the spring element. This prevents excessive thermal expansion from causing loss of electrical contact, as the stop area is positioned to maintain contact pressure even when the spring element expands due to thermal stress. The design thus accommodates thermal expansion while preventing contact loss through the predefined stop position.

The insulating mass provides beforehand cushioning by being arranged between the stop area and the housing. This cushioning structure allows the spring element to expand thermally while maintaining contact with the piezoelectric element, as the insulating mass absorbs the thermal expansion stress and prevents the spring element from moving away from the contact surface, thereby maintaining electrical contact reliability under temperature variations.