Hydraulic pump or hydraulic motor having a rotation speed sensor

Abstract

The invention relates to a hydraulic pump or hydraulic motor having a rotating shaft, which is mounted in a fixed position in a housing and on which a pulse generator is provided, and having a rotation speed sensor, which is fixed to the housing and comprises a sensor element associated with the pulse generator, the sensor element being fitted eccentrically and offset with respect to the insertion axis of the rotation speed sensor.

1 . Hydraulic pump or hydraulic motor having a rotating shaft ( 5 ), which is mounted in a fixed position in a housing ( 6   a ,  6   b ) and on which a pulse generator ( 4 ) is provided, and having a rotation speed sensor ( 1   a ), which is fixed to the housing ( 6   a ,  6   b ) and comprises a sensor element ( 3 ) associated with the pulse generator ( 4 ), characterized in that the sensor element ( 3 ) is fitted eccentrically and offset with respect to the insertion axis ( 2 ) of the rotation speed sensor ( 1   a ).  
   
   
       2 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the rotation speed sensor ( 1   a ) is in the form of an L-shaped built-in part, on whose first limb ( 14 ) the sensor element ( 3 ) is provided, and on whose second limb ( 15 ) fixing means ( 11 ), intended for installation in the housing ( 6   a ,  6   b ), and a plug element ( 12 ), for electrically connecting the sensor element ( 3 ) to electronics fitted outside the housing ( 6   a ,  6   b ), are provided.  
   
   
       3 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the offset of the sensor element ( 3 ) with respect to the insertion axis ( 2 ) of the rotation speed sensor ( 1   a ) is greater than the radius of the housing hole, which extends around the insertion axis ( 2 ), for the purpose of accommodating the second limb ( 15 ) of the rotation speed sensor ( 1   a ).  
   
   
       4 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the sensor element ( 3 ) is in the form of a Hall probe.  
   
   
       5 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the sensor element ( 3 ) is in the form of a GMR sensor.  
   
   
       6 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the sensor element ( 3 ) is in the form of an AMR sensor.  
   
   
       7 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the sensor element ( 3 ) is in the form of an inductive sensor.  
   
   
       8 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the pulse generator ( 4 ) is in the form of a magnet element.  
   
   
       9 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the pulse generator ( 4 ) is in the form of an annular gear.  
   
   
       10 . Hydraulic pump or hydraulic motor according to  claim 2 , characterized in that the first limb ( 14 ), bearing the sensor element ( 3 ), of the L-shaped rotation speed sensor ( 1   a ) is longer than the second limb ( 15 ).  
   
   
       11 . Hydraulic pump or hydraulic motor according to  claim 2 , characterized in that the first limb ( 14 ) of the L-shaped rotation speed sensor ( 1   a ) comprises a printed circuit board ( 13 ), which bears the sensor element ( 3 ).  
   
   
       12 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the second limb ( 15 ) of the rotation speed sensor ( 1   a ) is designed such that it closes off the wall of the housing ( 6   a ,  6   b ) in a sealing manner once it has been installed in said housing ( 6   a ,  6   b ).  
   
   
       13 . Hydraulic pump or hydraulic motor according to  claim 1 , characterized in that the rotation speed sensor is combined with a temperature sensor.