Apparatus for Detecting Torque and Steering System Having the Same

Abstract

The present invention relates to a torque measuring device, the torque measuring device including a stator arranged at an inner surface of a housing, a magnet distantly arranged with the stator at a predetermined gap, a sensing unit detecting a magnetic field generated from between the stator and the magnet, and a non-magnetic stator holder integrally formed with a stator fixture fixed by the stator and a shaft fixture fixed by a shaft, whereby manufacturing cost can be minimized, and defects generated in the course of manufacturing process can be minimized.

What is claimed is: 
     
         1 . A torque measuring device, the torque measuring device comprising:
 a case housing comprising a first case and a second case interconnected with the first case;   a stator holder disposed in the case housing;   a stator fixed at a surface of the stator holder and comprising a first stator and a second stator, wherein the first and second stators each have a ring-shaped stator body and a plurality of stator teeth formed at an inner circumferential surface of the stator body;   a magnet secured at the periphery of a magnet holder, the magnet being arranged opposite to the stator teeth;   a sensing unit detecting a magnetic field generated between the stators and the magnet; and   a collector disposed in the case housing and configured to focus the magnetic field;   wherein the stator holder comprises a shaft fixture and a stator fixture for coupling the first and second stators at opposite ends of the stator fixture;   wherein the stator fixture and the shaft fixture are intergrally formed with the stator holder;   wherein the stator fixture comprises two accommodation units protrusively formed at each distal end of the periphery thereof, wherein each of the accommodation units accommodates each of the stator bodies at a distal end of a periphery of the corresponding stator body; and   wherein the stator fixture comprises a plurality of insertion holes, and wherein each of the plurality of insertion holes has a predetermined position for a stator tooth of the first stator to be circumferentially inserted.   
     
     
         2 . The torque measuring device of  claim 1 , wherein the stator holder is formed with a non-magnetic metal material. 
     
     
         3 . The torque measuring device of  claim 1 , wherein the stator fixture further comprises tooth insertion holes distantly formed at a predetermined space in a peripheral direction of each of the accommodation units. 
     
     
         4 . The torque measuring device of  claim 1 , wherein the stator holder is formed with an aluminum material. 
     
     
         5 . The torque measuring device of  claim 1 , wherein the stator holder is formed with a zinc material. 
     
     
         6 . The torque measuring device of  claim 1 , wherein the stator holder is formed with a non-magnetic metal compound. 
     
     
         7 . The torque measuring device of  claim 1 , wherein the stator holder is manufactured by a die casting method. 
     
     
         8 . The torque measuring device of  claim 1 , wherein each of the stator teeth of the first stator is meshed with a corresponding stator tooth of the second stator in a predetermined position through a corresponding one of the insertion holes. 
     
     
         9 . A vehicular steeling device, the vehicular steering device comprising:
 a first shaft connected to a steering wheel;   a second shaft connected to the first shaft;   a case housing comprising a first case formed with a first through hole to pass the first shaft and a second case interconnected with the first case and formed with a second through hole to pass the second shaft;   a stator holder disposed in the case housing;   a stator fixed at a surface of the stator holder and comprising first and second stators, wherein each of the first and second stators has a ring-shaped stator body and a plurality of stator teeth formed at an inner circumferential surface of each stator body;   a magnet secured at the periphery of a magnet holder, the magnet being arranged opposite to the stator teeth;   a sensing unit disposed at an inner surface of the case housing and detecting a magnetic field generated between the first and second stators and the magnet; and   a collector disposed in the case housing and configured to focus the magnetic field;   wherein the stator holder comprises a stator fixture for coupling the first and second stators at opposite ends of the stator fixture;   wherein the stator fixture and the shaft fixture are integrally formed with the stator holder;   wherein the stator fixture includes two accommodation units protrusively formed at each distal end of the periphery thereof, wherein each of the accommodation units accommodates each of the stator bodies at a distal end of a periphery of the corresponding stator body; and   wherein the stator fixture comprises a plurality of insertion holes and wherein each of the plurality of insertion holes has a predetermined position for a stator tooth of the first stator to be circumferentially inserted.   
     
     
         10 . The vehicular steering device of  claim 9 , wherein the stator holder is formed with a non-magnetic metallic material. 
     
     
         11 . The vehicular steering device of  claim 9 , wherein the stator fixture further comprises tooth insertion holes distantly formed at a predetermined space in a peripheral direction of each of the accommodation units. 
     
     
         12 . The vehicular steering device of  claim 9 , wherein the stator holder is formed with a non-magnetic metal compound. 
     
     
         13 . The vehicular steering device of  claim 9 , wherein the stator holder is manufactured. by a die casting method. 
     
     
         14 . The torque measuring device of  claim 1 , wherein each of the stator bodies of the first and the second stator is formed with a plurality of fixing pins at a predetermined space. 
     
     
         15 . The torque measuring device of  claim 14 , wherein each of the plurality of fixing pins is bent to be accommodated at a periphery of the stator holder. 
     
     
         16 . The torque measuring device of  claim 1 , wherein the first and second cases are interconnected to have a space therebetween. 
     
     
         17 . The vehicular steering device of  claim 9 , wherein each of the stator bodies of the first and the second stator is formed with a plurality of fixing pins at a predetermined space. 
     
     
         18 . The vehicular steering device of  claim 17 , wherein each of the plurality of fixing pins is bent to be accommodated at a periphery of the stator holder. 
     
     
         19 . The vehicular steering device of  claim 9 , wherein the first and second cases are interconnected to have a space therebetween. 
     
     
         20 . The vehicular steering device of  claim 9 , wherein each of the stator teeth of the first stator is meshed with a corresponding stator tooth of the second stator in a predetermined position through a corresponding one of the insertion holes.