Force sensor systems especially for determining dynamically the axle load, speed, wheelbase and gross weight of vehicles

A force acceleration sensor comprising:

• a center post;
• a pair of piezo discs separated by said post;
• a pair of force-introducing parts separated by said piezo discs and said post;
• and
• an elastically deformable sleeve encompassing said post, piezo discs and force-introducing parts and elastically preloading said piezo discs by elastical deformation of said sleeve.

A force sensor comprising:

• a sensor case;
• a center post unitary with said sensor case;
• a pair of piezo discs separated by said post;
• a pair of force-introducing parts separated by said piezo discs and said post;
• and
• an elastically deformable sleeve encompassing said post, piezo discs and force-introducing parts and elastically preloading said piezo discs.

A force sensor comprising:

• a center post;
• a pair of piezo discs separated by said post;
• a pair of force-introducing parts separated by said piezo discs and said post;
• and
• an elastically deformable sleeve unitary with said force-introducing parts and encompassing said post, piezo discs and force-introducing parts and elastically preloading said piezo discs.