Axially securing a shaft component of an electric machine
A shaft system includes a shaft having a first shaft portion. The first shaft portion has a profile which is formed in the radial direction, extends in the axial direction, has a constant cross-section in a first region, and is open in the axial direction towards a first side of the shaft portion. In a second region of the first shaft portion adjoining the first region, the profile has a taper in the direction of a second side opposite the first side. A peripheral groove extending in the circumferential direction is introduced between the first region and the second region and forms a first groove flank in the first region and a second groove flank in the second region. The second groove flank forms an axial boundary for the profile in the first region towards the second side. Also disclosed is an electric machine comprising said shaft system.
1 . A shaft system, comprising:
a shaft with a first shaft portion that has a profile which is formed in a radial direction, extends in an axial direction, has a constant cross-section in a first region, and is open in the axial direction towards a first side of the first shaft portion;
in a second region of the first shaft portion adjoining the first region, the profile has a taper in a direction of a second side opposite the first side, wherein the taper has a reduction of a profile width in the circumferential direction as well as a reduction of a profile depth in the radial direction;
a peripheral groove extending in a circumferential direction between the first region and the second region that forms a first groove flank in the first region and a second groove flank in the second region; and
the second groove flank abuts or adjoins the taper, forming an axial stop of the profile in the second region towards the second side.
2 . The shaft system according to claim 1 , wherein the first shaft portion has a first tip diameter in the first region, the first shaft portion has a second tip diameter in the second region, and the second tip diameter is larger than the first tip diameter.
3 . The shaft system according to claim 1 , wherein the profile in the first region is adapted to receive a shaft component with a corresponding counter-profile, and the second groove flank forms the axial stop for the shaft component.
4 . The shaft system according to claim 3 , wherein the profile in the first region and the corresponding counter-profile of the shaft component are configured to transmit forces in the circumferential direction.
5 . The shaft system according to claim 1 , wherein the profile in the first region is a spline profile, and the taper in the second region is implemented by a run-out of a tool used to produce the spline profile.
6 . The shaft system according to claim 3 , wherein the shaft component is formed of several parts.
7 . The shaft system according to claim 6 , wherein the shaft component is a rotor core of an electric machine comprising a first balancing disk and a first laminated core.
8 . The shaft system according to claim 3 , further comprising:
a second shaft portion with a second peripheral groove extending in the circumferential direction;
a securing device;
a form-fitting connection formed by a deformation of the securing device into the second peripheral groove; and
the securing device forms an axial first stop in the second shaft portion for the shaft component.
9 . An electric machine comprising a shaft system according to claim 1 .
10 . A shaft system, comprising:
a shaft that is hollow from a first axial end to a second axial end, the shaft comprising a first shaft portion that has a profile which is formed in a radial direction, extends in an axial direction, has a constant cross-section in a first region, and is open in the axial direction towards a first side of the first shaft portion;
in a second region of the first shaft portion adjoining the first region, the profile has a taper in a direction of a second side located opposite to the first side;
a peripheral groove extending in a circumferential direction between the first region and the second region that forms a first groove flank in the first region and a second groove flank in the second region;
the second groove flank abuts or adjoins the taper, forming an axial stop of the profile in the second region towards the second side; and
a circumferentially extending cooling channel located in the first region, the cooling channel being fluidly connected to the hollow interior of the shaft through at least one bore.
11 . The shaft system according to claim 10 , wherein the taper has a reduction of a profile width in the circumferential direction as well as a reduction of a profile depth in the radial direction.
12 . The shaft system according to claim 10 , wherein the first shaft portion has a first tip diameter in the first region, the first shaft portion has a second tip diameter in the second region, and the second tip diameter is larger than the first tip diameter.
13 . The shaft system according to claim 10 , wherein the profile in the first region is adapted to receive a shaft component with a corresponding counter-profile, the second groove flank forms the axial stop for the shaft component; and the cooling channel is adapted to provide cooling fluid to the shaft component.
14 . The shaft system according to claim 13 , wherein the profile in the first region and the corresponding counter-profile of the shaft component are configured to transmit forces in the circumferential direction.
15 . The shaft system according to claim 10 , wherein the profile in the first region is a spline profile, and the taper in the second region comprises a radial run-out of the spline profile.
16 . The shaft system according to claim 13 , wherein the shaft component is formed of several parts.
17 . The shaft system according to claim 16 , wherein the shaft component is a rotor core of an electric machine comprising a first balancing disk and a first laminated core, and the cooling channel is configured to provide a flow of cooling fluid to the laminated core.
18 . The shaft system according to claim 13 , further comprising: a second shaft portion with a second peripheral groove extending in the circumferential direction; a securing device; a form-fitting connection formed by a deformation of the securing device into the second peripheral groove; and the securing device forms an axial first stop in the second shaft portion for the shaft component.
19 . The shaft system according to claim 18 , wherein there are two of the circumferentially extending cooling channels located in the first region, a first one of the circumferentially extending cooling channels being located adjacent to the peripheral groove that extends in the circumferential direction between the first region and the second region, and the second one of the circumferentially extending cooling channels being located adjacent to the second peripheral groove.