Sensor assembly in a gearbox for positioning
The invention relates to a sensor assembly in a gearbox which is used for positioning, where the sensor assembly comprises a relative to the gearbox housing ( 18 ) fixed sensor ( 20 ), and where the angle between the gearbox housing ( 18 ) and the output shaft ( 26 ) of a gearbox ( 14, 16 ) is measured using a to the output shaft ( 26 ) fixed and to the sensor ( 20 ) connected shaft ( 28 ), whereby a sensor assembly which measures the angle in the gearbox ( 14, 16 ) including the play in the gearbox ( 14, 16 ) is attained, which gives increased precision at the same time as gearboxes ( 14, 16 ) with play can be utilized for accurate angle positioning.
1. Sensor assembly in a gearbox which is used for positioning, where the sensor assembly comprises a sensor ( 20 ) fixed relative to a gearbox housing ( 18 ), characterized in, that the angle between the gearbox housing ( 18 ) and an output shaft ( 26 ) of the gearbox ( 14 , 16 ) is measured using a shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ), and that the sensor assembly comprises a control system which receives information about the actual angle between the gearbox ( 14 , 16 ) and the output shaft ( 26 ) and reduces the power to a motor ( 22 ) of the gearbox ( 14 , 16 ) when the gearbox ( 14 , 16 ) approaches a pre-programmed end position.
2. Sensor assembly as claimed in claim 1 , characterised in, that the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) passes through a central through hole ( 40 ) in the motor ( 22 ) connected to an input shaft ( 24 ) of the gearbox ( 14 , 16 ).
3. Sensor assembly as claimed in claim 2 , characterised in, that the gearbox ( 14 , 16 ) is arranged in a mining or construction machine.
4. Sensor assembly as claimed in claim 2 , characterised in, that the gearbox ( 14 , 16 ) is arranged to achieve the rotations for a rotational degree of freedom (Z 4 , Z 5 ) in a joint ( 3 , 5 ) of a drill boom ( 4 ) in a rock drilling rig ( 2 ).
5. Sensor assembly as claimed in claim 1 , characterised in, that the gearbox ( 14 , 16 ) is arranged in a mining or construction machine.
6. Sensor assembly as claimed in claim 1 , characterised in, that the gearbox ( 14 , 16 ) is arranged to achieve the rotations for a rotational degree of freedom (Z 4 , Z 5 ) in a joint ( 3 , 5 ) of a drill boom ( 4 ) in a rock drilling rig ( 2 ).
7. Sensor assembly as claimed in claim 1 , characterised in, that the output shaft ( 26 ) and the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) are made in one piece.
8. Sensor assembly in a gearbox which is used for positioning, where the sensor assembly comprises a sensor ( 20 ) fixed relative to a gearbox housing ( 18 ), characterized in, that the angle between the gearbox housing ( 18 ) and an output shaft ( 26 ) of the gearbox ( 14 , 16 ) is measured using a shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ), characterized in, that the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) passes through the center of the gearbox ( 14 , 16 ), and that the sensor assembly comprises a control system which receives information about the actual angle between the gearbox ( 14 , 16 ) and the output shaft ( 26 ) and reduces the power to a motor ( 22 ) of the gearbox ( 14 , 16 ) when the gearbox ( 14 , 16 ) approaches a pre-programmed end position.
9. Sensor assembly as claimed in claim 8 , characterised in, that the gearbox ( 14 , 16 ) houses a planetary gear.
10. Sensor assembly as claimed in claim 9 , characterised in, that the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) passes through a central through hole ( 40 ) in the motor ( 22 ) connected to an input shaft ( 24 ) of the gearbox ( 14 , 16 ).
11. Sensor assembly as claimed in claim 9 , characterised in, that the gearbox ( 14 , 16 ) is arranged in a mining or construction machine.
12. Sensor assembly as claimed in claim 9 , characterised in, that the gearbox ( 14 , 16 ) is arranged to achieve the rotations for rotational degree of freedom (Z 4 , Z 5 ) in a joint ( 3 , 5 ) of a drill boom ( 4 ) in a rock drilling rig ( 2 ).
13. Sensor assembly as claimed in claim 9 , characterised in, that the output shaft ( 26 ) and the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) are made in one piece.
14. Sensor assembly as claimed in claim 2 , characterised in, that the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) passes through a central through hole ( 40 ) in the motor ( 22 ) connected to an input shaft ( 24 ) of the gearbox ( 14 , 16 ).
15. Sensor assembly as claimed in claim 8 , characterised in, that the gearbox ( 14 , 16 ) is arranged in a mining or construction machine.
16. Sensor assembly as claimed in claim 8 , characterised in, that the gearbox ( 14 , 16 ) is arranged to achieve the rotations for a rotational degree of freedom (Z 4 , Z 5 ) in a joint ( 3 , 5 ) of a drill boom ( 4 ) in a rock drilling rig ( 2 ).
17. Sensor assembly as claimed in claim 8 , characterised in, that the output shaft ( 26 ) and the shaft ( 28 ) fixed to the output shaft ( 26 ) and connected to the sensor ( 20 ) are made in one piece.