Axial force transducer
Disclosed is an axial force transducer comprising a deformable element ( 1 ) which forms a measuring spring and is rotationally symmetrical to the force inducing axis as well as strain gauges ( 15, 18 ) that are arranged in pairs in areas extending in opposite directions and are connected so as to form an electrical resistance bridge. The deformable element ( 1 ) is provided with a central location hole ( 8 ) which extends radially under the effect of an axial force and whose edge ( 12 ) is connected to a deformable disk ( 13 ) via an annular rib ( 10 ), said deformable disk ( 13 ) being disposed at an axial distance from the location hole ( 8 ). The edge ( 14 ) of the deformable disk ( 13 ) radially protrudes from the annular rib ( 10 ). The strain gauges ( 15, 18 ) are applied to the face of the deformable disk ( 13 ) in pairs, inside and outside the diameter of the annular rib ( 10 ).
1. Axial force transducer comprising a deformable element which forms a measuring spring and is rotationally symmetrical to the force inducing axis as well as strain gauges that are arranged in pairs in areas extending in opposite directions and are connected so as to form an electrical resistance bridge, wherein the deformable element is provided with a central location hole which extends radially under the effect of an axial force and whose edge is connected to a deformable disk via an annular rib, the deformable disk being disposed at an axial distance from the location hole and the edge of the deformable disk radially protruding from the annular rib, and in that the strain gauges are applied to the face of the deformable disk in pairs, inside and outside the diameter of the annular rib.
2. Axial force transducer according to claim 1 , wherein the strain gauges are applied in radial measuring direction.
3. Axial force transducer according to claim 1 , wherein the strain gauges are applied in tangential measuring direction.
4. Axial force transducer according to one of the claims 1 - 3 , wherein the two pairs of strain gauges are disposed at approximately equal radial distance in relation to the mean diameter of the annular rib.
5. Axial force transducer according to one of the claims 1 through 4 , wherein the strain gauges are disposed at an angular distance of 90° in relation to one another.
6. Axial force transducer according to claim 1 , wherein the annular rib and the deformable disk form a single piece sensor body that is connected to the edge of the deformable element that forms the measuring spring.
7. Axial force transducer according to claim 6 , wherein the annular rib comprises a radially protruding force inducing flange that is connected to the edge of the location hole.
8. Axial force transducer according to one of the claims 1 - 7 , wherein the annular rib is a hollow cylindrical ring.
9. Axial force transducer according to claim 6 , wherein the deformable element is approximately bowl-shaped and in that the bottom of the bowl comprises the location hole that accommodates the sensor body.
10. Axial force transducer according to claim 9 , wherein the bottom of the bowl substantially is a bendable membrane ring in the area that surrounds the location hole.
11. Axial force transducer according to claim 9 , wherein the bottom of the bowl comprises an axially protruding force inducing ring.