Shaft arrangement having a rolling bearing
View Patent ↗A shaft arrangement, with a rotatable shaft supported in a rolling bearing, which has rolling elements and an outer race, a torsion sensor having a permanently magnetic ring and at least one magnetic field sensor fastened to a fixed sensor bracket attached to the outer race being provided. A torsion sensor can hereby be integrated in a rotating bearing in a simple design.
1. A shaft arrangement, comprising:
a rotatable shaft;
a rolling bearing ring having an inner ring fastened on a circumference of the shaft, an outer ring spaced from and opposing the inner ring and rolling bodies arranged between the outer ring and the inner ring;
a stationary sensor carrier connected to the outer ring and having a recess;
a torsion sensor having at least one magnetic-field sensor and a permanent magnetic ring, the permanent magnetic ring being fixedly connected to the shaft, and the magnetic-field sensor being fixed in the recess of the stationary sensor carrier of the outer ring.
2. The shaft arrangement of claim 1 , wherein the sensor carrier, which has an inside face, surrounds the shaft annularly and the recess is on the inside face.
3. The shaft arrangement of claim 2 , wherein the sensor carrier forms an extension of the outer ring in an axial direction of the shaft.
4. The shaft arrangement of claim 3 , wherein the outer ring carries the sensor carrier.
5. The shaft arrangement of claim 1 , wherein the permanent-magnetic ring is fastened on a surface area of the shaft in a region of the sensor carrier.
6. The shaft arrangement of claim 5 , wherein the permanent magnetic ring is connected non-positively to the shaft.
7. The shaft arrangement of claim 5 , wherein the permanent magnetic ring is positively connected to the shaft.
8. The shaft arrangement of claim 1 , wherein the permanent magnetic ring is connected to an axial extension of the inner ring of the bearing or is integrated in the inner ring.
9. The shaft arrangement of claim 1 , wherein the permanent magnetic ring is formed as part of the shaft, in one piece with the shaft.
10. A method for producing a shaft arrangement of claim 1 , wherein magnetization of the permanent magnetic ring is achieved by pulsed generation of an electrical current passing through the ring.
11. The shaft arrangement of claim 1 , wherein the shaft has a recess in which the permanent magnetic ring is embedded.
12. The shaft arrangement of claim 1 , wherein the permanent magnetic ring has a circumference which is interrupted at one point so as to allow the permanent magnetic ring to be snapped on the shaft resiliently.
13. A shaft arrangement, comprising:
a rotatable shaft;
a rolling bearing having an inner ring mounted on a circumference of the shaft, an outer ring spaced from and opposing the inner ring and rolling bodies arranged between the outer ring and the inner ring;
a stationary sensor carrier arranged axially spaced from the outer ring;
a cylindrical sleeve having a first segment extending axially above the outer ring, a second segment extending from the first segment radially between the outer ring and the stationary sensor carrier and a third segment extending axially from the second segment, in a direction opposite the first segment, beneath the stationary sensor carrier with the stationary sensor carrier firmly connected to the outer ring by the sleeve; and
a torsion sensor having at least one magnetic-field sensor and a permanent magnetic ring, the magnetic field sensor, which opposes the permanent magnetic ring, is carried by the stationary sensor carrier and the permanent magnetic ring is an axial extension of the inner ring.
14. A shaft arrangement, comprising:
a rotatable shaft;
a rolling bearing ring having an inner ring fastened on a circumference of the shaft, an outer ring spaced from and opposing the inner ring and rolling bodies arranged between the outer ring and the inner ring;
a stationary sensor carrier connected to the outer ring;
a torsion sensor having at least one magnetic-field sensor and a permanent magnetic ring, the permanent magnetic ring being fixedly connected to the shaft, and the magnetic-field sensor being fastened to the stationary sensor carrier of the outer ring,
wherein the sensor carrier, which has an inside face, surrounds the shaft annularly and carries the magnetic-field sensor or magnetic-field sensors on the inside face,
wherein the sensor carrier forms an extension of the outer ring in an axial direction of the shaft, and
wherein the sensor carrier is connected to the outer ring by means of a cylindrical sleeve.
15. The shaft arrangement of claim 14 , wherein the cylindrical sleeve has a first segment extending axially above the outer ring, a second segment extending from the first segment radially between the outer ring and the stationary sensor carrier and a third segment extending axially from the second segment, in a direction opposite the first segment, beneath the stationary sensor carrier with the stationary sensor carrier firmly connected to the outer ring by the sleeve.
16. A method for producing a shaft arrangement of claim 14 , wherein magnetization of the permanent magnetic ring is achieved by pulsed generation of an electrical current passing through the ring.
17. The shaft arrangement of claim 14 , wherein the outer ring carries the sensor carrier.
18. The shaft arrangement of claim 14 , wherein the permanent-magnetic ring is fastened on a surface area of the shaft in a region of the sensor carrier.
19. The shaft arrangement of claim 14 , wherein the permanent magnetic ring is connected to an axial extension of the inner ring of the bearing or is integrated in the inner ring.