Encoder for determining an angular position and having a protective cap
An encoder ( 10 ) for determining an angular position, the encoder ( 10 ) comprising a shaft ( 14, 16 ), a housing ( 18 ) and a transition region ( 32 ), the shaft ( 14, 16 ) projecting outwards from the housing ( 18 ) into the transition region ( 32 ), a measuring element ( 20 ) connected to the shaft ( 14 ), a sensor ( 22 ) for detecting the measuring element ( 20 ), and a control and evaluation unit ( 28 ) for generating, from the signals of the sensor ( 22 ), an angle signal in dependence on the angular position of the measuring element ( 20 ), wherein a protective cap ( 34 ) is arranged in the transition region ( 32 ) for protection against fluids ( 12 ) directed with pressure onto the transition region ( 32 ).
1. An encoder ( 10 ) for determining an angular position, the encoder ( 10 ) comprising:
a shaft ( 14 );
a housing ( 18 ) and a transition region ( 32 ), an upper part ( 16 ) of the shaft ( 14 ) projecting outwards from the housing ( 18 ) into the transition region ( 32 );
a measuring element ( 20 ) connected to the shaft ( 14 );
a sensor ( 22 ) for detecting the measuring element ( 20 ); and
a control and evaluation unit ( 28 ) for generating, from signals from the sensor ( 22 ), an angle signal in dependence on an angular position of the measuring element ( 20 ),
wherein a protective cap ( 34 ) is arranged in the transition region ( 32 ) for protection against fluids ( 12 ) directed with pressure onto the transition region ( 32 ), and
wherein the protective cap ( 34 ) completely covers the upper part ( 16 ) of the shaft ( 14 ), the protective cap ( 34 ) extending an axial length of the upper part ( 16 ) of the shaft ( 14 ).
2. The encoder ( 10 ) according to claim 1 ,
wherein the protective cap ( 34 ) is made of pressure resistant material.
3. The encoder ( 10 ) according to claim 1 ,
wherein a seal ( 36 ) is arranged below the protective cap ( 34 ).
4. The encoder ( 10 ) according to claim 3 ,
wherein the seal ( 36 ) is arranged around the shaft ( 14 ).
5. The encoder ( 10 ) according to claim 1 ,
wherein the protective cap ( 34 ) is arranged around the shaft ( 14 ).
6. The encoder ( 10 ) according to claim 1 ,
wherein the protective cap ( 34 ) is arranged in press fit on the shaft ( 14 ).
7. The encoder ( 10 ) according to claim 1 ,
wherein the protective cap ( 34 ) has a lateral projection ( 34 a - b ) on at least one of its outer circumference and its inner circumference.
8. The encoder ( 10 ) according to claim 7 ,
wherein the lateral projection ( 34 a - b ) is shorter on the inside than on the outside.
9. The encoder ( 10 ) according to claim 1 ,
wherein the protective cap ( 34 ) has a shape of two concentric cylindrical surface sections ( 34 a - b ) with a circular ring as connecting base surface.
10. An encoder ( 10 ) for determining an angular position, the encoder ( 10 ) comprising:
a shaft ( 14 );
a housing ( 18 ) and a transition region ( 32 ), the shaft ( 14 ) projecting outwards from the housing ( 18 ) into the transition region ( 32 );
a measuring element ( 20 ) connected to the shaft ( 14 );
a sensor ( 22 ) for detecting the measuring element ( 20 ); and
a control and evaluation unit ( 28 ) for generating, from signals from the sensor ( 22 ), an angle signal in dependence on an angular position of the measuring element ( 20 ),
wherein a protective cap ( 34 ) is arranged in the transition region ( 32 ) for protection against fluids ( 12 ) directed with pressure onto the transition region ( 32 ), and
wherein the protective cap ( 34 ) is arranged in press fit on the shaft ( 14 ) such that the protective cap ( 34 ) rotates with the shaft ( 14 ).
11. The encoder ( 10 ) according to claim 10 ,
wherein the protective cap ( 34 ) is made of pressure resistant material.
12. The encoder ( 10 ) according to claim 10 ,
wherein a seal ( 36 ) is arranged below the protective cap ( 34 ).
13. The encoder ( 10 ) according to claim 12 ,
wherein the seal ( 36 ) is arranged around the shaft ( 14 ).
14. The encoder ( 10 ) according to claim 10 ,
wherein the protective cap ( 34 ) is arranged around the shaft ( 14 ).
15. The encoder ( 10 ) according claim 10 ,
wherein the protective cap ( 34 ) forms an extension of the shaft ( 14 ).
16. The encoder ( 10 ) according to claim 10 ,
wherein the protective cap ( 34 ) has a lateral projection ( 34 a - b ) on at least one of its outer circumference and its inner circumference.
17. The encoder ( 10 ) according to claim 16 ,
wherein the lateral projection ( 34 a - b ) is shorter on the inside than on the outside.
18. The encoder ( 10 ) according to claim 10 ,
wherein the protective cap ( 34 ) has a shape of two concentric cylindrical surface sections ( 34 a - b ) with a circular ring as connecting base surface.