Abstract: An acceleration detector including an acceleration transducer assembly including a piezoelectric element, an output terminal and an inertial weight. The transducer assembly is secured on a threaded bushing by a substantially ring-shaped, thread-engaging stop nut thread-engaging to the threaded bushing. The stop nut has an internal thread in its inner circumferential surface and a pair of axially extending engagement grooves formed in its outer circumferential surface at equal intervals for receiving a tool for rotating the stop nut about the bushing. The output terminal may have a ring-shaped portion, a connecting tab radially outwardly extending from the ring-shaped portion for an external connection, and a transition fillet provided at a transition area between the ring-shaped portion and the tab for moderating the concentration of stress on the transition area.

Abstract: An acceleration detector comprising a housing and an acceleration transducer assembly including a piezoelectric element, an inertial weight and an output terminal. A thread-engaging fastener on the bushing, for securing the transducer assembly in the housing, and an electrically insulating washer is provided, and a resilient filler material is applied around the acceleration transducer assembly in the housing so that the movement of the inertial weight relative to the housing is allowed when an acceleration is applied. An electrically insulating, low-friction washer made of a plastic material selected from a group consisting of polyester, polyethylene terephtalate and polyphenylene sulfite is disposed between the thread-engaging fastener and the output terminal of the transducer assembly.