Drive device for an electromechanical brake device, brake device
A drive device for an electromechanical brake device, in particular a brake booster. The drive device includes an electric motor that has a housing and a rotor shaft rotatably mounted in the housing. The rotor shaft is coupled to a transmission, in particular a planetary gear train that comprises a ring gear. The rotor shaft is rotatably mounted in the housing by at least one roller bearing. The roller bearing is held in a bearing seat of a bearing cover situated in the housing. The bearing cover has a ring-gear portion, which is spaced apart from the bearing seat and in which the ring gear is situated.
1 . A drive device for an electromechanical brake booster, the drive device comprising:
an electric motor;
a bearing cover situated in a housing of the electric motor;
a rotor shaft rotatably mounted in the housing by at least one roller bearing that is held in a bearing seat of the bearing cover; and
a transmission to which the rotor shaft is coupled and that includes a planetary gear train having a ring gear that is situated in a ring-gear portion of the bearing cover;
wherein:
the ring-gear portion is spaced apart from the bearing seat; and
a set of multiple radial elevations, which are spaced apart from one another in a circumferential direction, cooperate with a single corresponding recess to prevent rotation of the ring gear relative to the bearing cover.
2 . The drive device according to claim 1 , wherein the planetary gear train further includes a sun gear situated in a rotationally fixed manner on the rotor shaft and a plurality of planetary gears.
3 . The drive device according to claim 2 , wherein the transmission is a spindle transmission that includes an axially slidably supported spindle and a spindle gear that (a) is rotatably supported and engaged with the spindle by way of a helical gearing and (b) forms a planetary gear support for the planetary gears.
4 . The drive device according to claim 3 , wherein the ring gear includes a meshing portion and a centering portion formed integrally with the meshing portion, the meshing portion interacts with the planetary gears, the ring gear is supported on a bearing cover of the spindle transmission by way of the centering portion of the ring gear, and the centering portion of the ring gear extends axially from the meshing portion in a direction away from an axial position of the planetary gears towards an axial position of the spindle.
5 . The drive device according to claim 4 , wherein the bearing cover of the spindle transmission extends axially between a first end of bearing cover of the spindle transmission and a second end of the bearing cover of the spindle transmission, the first end of the bearing cover of the spindle transmission is more distal to the axial position of the planetary gears than second end of the bearing cover of the spindle transmission, and the second end of the bearing cover of the spindle transmission is at more radially inward position than the first end of the bearing cover of the spindle transmission.
6 . The drive device according to claim 1 , wherein the set of multiple radial elevations is provided as part of the ring-gear portion of the bearing cover and is positioned within the single corresponding recess provided in the ring gear.
7 . The drive device according to claim 1 , wherein the set of multiple radial elevations is provided as part of the ring gear is positioned within the single corresponding recess provided in the ring-gear portion of the bearing cover.
8 . The drive device according to claim 1 , wherein:
the single corresponding recess is one of a plurality of recesses spaced apart from one another in the circumferential direction;
the multiple radial elevations of the set form one of a plurality of subsets of a plurality of radial elevations; and
each respective one of the subsets (i) includes a respective one or more of the plurality of radial elevations and (ii) cooperates with a respective corresponding one of the plurality of recesses.
9 . The drive device according to claim 8 , wherein the subsets of the radial elevations and the radial recesses are situated in an evenly distributed manner about a circumference of the ring-gear portion.
10 . A drive device for an electromechanical brake booster, the drive device comprising:
an electric motor; a transmission that includes a planetary gear train having a ring gear that forms a ring-gear portion of a bearing cover situated in a housing of the electric motor, so that the ring gear is integrally developed with the bearing cover; and
a rotor shaft that is coupled to the transmission and that is rotatably mounted in the housing by at least one roller bearing that is held in a bearing seat of the bearing cover, wherein the bearing seat is spaced apart from the ring-gear portion of the bearing cover.
11 . The drive device according to claim 10 , wherein the drive device is arranged to drive a hydraulic pressure generator of a brake device of a motor vehicle.
12 . A brake device for a motor vehicle, the brake device comprising:
a hydraulic pressure generator; and
a drive device configured to drive the hydraulic pressure generator, the drive device including:
an electric motor; a bearing cover situated in a housing of the electric motor;
a rotor shaft rotatably mounted in the housing by at least one roller bearing that is held in a bearing seat of the bearing cover; and
a transmission to which the rotor shaft is coupled and that includes a planetary gear train having a ring gear that is situated in a ring-gear portion of the bearing cover; wherein:
the ring-gear portion is spaced apart from the bearing seat; and
a set of multiple radial elevations, which are spaced apart from one another in a circumferential direction, cooperate with a single corresponding recess to prevent rotation of the ring gear relative to the bearing cover.