Engine knock sensor using piezoelectric rod oscillator

US4305013A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Paul Andrew BAIER · Renchen, DE
• Alfred Schulz · Oberriexingen, DE

Key dates

• Filing date: Jul 26, 1979
• Grant date: Dec 8, 1981
• Expiry date: Jul 26, 1999

Classification

• Technology area (CPC G): Physics
• CPC primary: G01L23/222
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

In order to provide a unitary, rugged and simplified engine knock sensor assembly for internal combustion engines, which is readily tunable after manufacture to particular frequency characteristics of a given engine, the invention provides a cantilevered bending oscillator which is clamped together with a suitable electrical contact in an axial channel of a metallic cylindrical socket. The radial clamping forces are permanently provided by deformation of the socket material, for example by mortising, or other dimensional changes of the socket material. A number of embodiments is presented. The invention also includes a method for simultaneously producing two separate electrical contacts from a single contact element.