Combustion pressure sensor designed to ensure stability of output characteristic and sensitivity

A combustion pressure sensor for an internal combustion engine comprising:

• a hollow cylindrical housing having a length, said housing being designed to have a combustion chamber side end facing a combustion chamber of an internal combustion engine;
• a load detector including a bendable member and a sensing element, the bendable member being subjected to a bend deformation upon application of a physical load applied thereto, the sensing element being placed in abutment with the bendable member so as to undergo a bend deformation following the bend deformation of the bendable member to produce a signal as a function of the physical load applied to the bendable member;
• and
• a load transmitting member disposed within said housing, said load transmitting member having a length with an end portion extending outside the combustion chamber side end of said housing, said load transmitting member working to transmit a combustion pressure within the combustion chamber of the engine to the bendable member of said load detector as the physical load,
• wherein the bendable member has formed in a center thereof a hole through which said load transmitting member passes and also has a tapered wall formed thereon, wherein said load transmitting member includes a contact member having a rounded surface which makes a line-to-line contact with the tapered wall of said bendable member.