The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 08, 1984
Filed:
Jun. 21, 1982
Manfred Boruschewitz, Berlin, DE;
Hansjoachim Hamisch, Berlin, DE;
Robert Bosch GmbH, Stuttgart, DE;
Abstract
To facilitate manufacture and assembly of a vibration sensor, particularly to sense knocking vibrations or incipient knocking in an internal conbustion (IC) engine, piezoelectric elements are secured to the machine or cylinder or a cylinder head bolt, the vibration of which is to be sensed, and a flexing strip is resiliently engaged with a surface of the piezoelectric element or elements, and arranged transverse to the direction of vibration of the machine or IC engine. In a preferred form, the piezoelectric element can be a tubular structure (FIG. 4: 19) located in a cross bore (16) of a cylinder head bolt, the free swinging flexing element (21) being positioned within the hollow portion of the tubular piezoelectric element and pressed against an outer end face by a spring engaging laterally projecting wings (22) secured to the flexing strip.