Vehicle brake pad and method of production thereof

Abstract

A vehicle brake pad () comprising: a support plate (); a friction pad (); at least a shear force sensing device; and an electrical circuit configured to collect signals from the shear force sensing device (); wherein the shear force sensing device () comprises: a sheet () of piezoelectric material having a first and a second main faces () parallel to each other identifying a shear stress direction(S); at least a first digitated reading electrode () located on the first main face (); at least a second digitated reading electrode () located on the second main face (), the first and second reading electrodes () having digits () aligned along a reading direction (R) orthogonal to the stress shear direction(S); at least a first digitated polarizing electrode () located on the first main face () and interdigitated with the first digitated reading electrode (); and at least a second digitated polarizing electrode () located on the second main face () and interdigitated with the second digitated reading electrode (); and wherein the piezoelectric material has a bulk electric polarization with vector field (E) transversally oriented to the reading direction (R), each pair of aligned digits () of the first and second reading electrodes () enclosing a respective zone () of the piezoelectric material having the vector field (E) most tangentially oriented to the shear stress direction(S).