Bearing arrangement in an axial drive with dual stators and one rotor

Patent metadata

Field	Value
Publication number	US-10250098-B2
Application number	US-201314395619-A
Country	US
Kind code	B2
Filing date	Apr 11, 2013
Priority date	Apr 20, 2012
Publication date	Apr 2, 2019
Grant date	Apr 2, 2019

Abstract

The invention relates to a drive device, particularly comprising an internal rotor motor, with a motor housing, a stator for a winding and a rotor having at least one permanent magnet, wherein the motor housing has a housing part extending substantially radially on one side of the stator and the rotor has two rotor bearings. The rotor bearings are arranged on the substantially radially extending housing part or on a part connected thereto which extends substantially axially.

First claim

We claimed:

1. A drive device for modifying hydraulic pressure of a brake, comprising:
an inner rotor motor;
a gear transmission arranged to act on a piston of a hydraulic brake pressure modifier and comprising a rotating gear transmission part that is a nut or spindle of a spindle gear, wherein the hydraulic brake pressure modifier is configured to act on the piston of the hydraulic brake pressure modifier;
a motor housing;
a stator with winding and forming a part of the inner rotor motor; and
a rotor with at least one permanent magnet, wherein the rotor is disposed radially inside the stator and forms a part of the inner rotor motor;
wherein the motor housing has a motor housing part extending essentially radially on one side of the stator,
wherein one or more bearings for the rotor and the gear transmission is/are arranged in the motor housing or on the motor housing part or on a component firmly connected to the motor housing part,
wherein the one or more bearings lie radially between the spindle and the stator of the inner rotor motor, and
wherein the one or more bearings is/are arranged on only one side in the motor housing or on the motor housing part, wherein there is no bearing on another side in the motor housing or on the motor housing part, wherein the only one side of the motor housing or motor housing part is defined by a side of a radial plane passing through the rotor, and which is oriented perpendicular to an axis of rotation of the rotating gear transmission part, so that bearing forces are at least substantially absorbed by the only one side of the motor housing or the motor housing part,
wherein the piston of the brake pressure modifier is located on the another side of the motor housing or the radial plane, having no bearings.

2. The drive device according to claim 1 , wherein a bearing is partly integrated into the rotating gear transmission part.

3. The drive device according to claim 1 , further comprising a ring arranged between the bearing component and the motor housing and configured to make a form-fit connection.

4. The drive device according to claim 1 , wherein the component connected to the housing forms an inner stator.

5. The drive device according to claim 1 , wherein the rotor is connected to the rotating gear transmission part or to a nut of a ball screw assembly.

6. The drive device according to claim 1 , wherein the motor has one or two air gaps between the stator and the rotor.

7. The drive device according to claim 1 , further comprising a device configured to reset an axially movable part of the gear transmission, wherein the device is arranged in a housing of the drive device outside the motor housing, and wherein the device is configured to be actuated by a reset spring and includes a coupling element.

8. The drive device according to claim 1 , wherein only one bearing is provided for the rotor and the rotating gear transmission part, wherein the bearing is designed as a four-point contact bearing or a double angular contact ball bearing.

9. The drive device according to claim 1 , wherein a thrust bearing and a radial bearing are provided for the rotor and the rotating gear transmission part.

10. The drive device according to claim 1 , wherein two thrust ball bearings are provided for the rotor and the rotating gear transmission part.

11. The drive device according to claim 1 , wherein, between an axially external bearing and a locking ring, an axial clearance is arranged to be set with respect to the bearing, in which a space relative to a spring element is arranged.

12. The drive device according to claim 1 , including a four-point contact bearing comprising an inner bearing ring and an outer bearing ring, wherein the inner bearing ring or the outer bearing ring of the four-point contact bearing is designed split.

13. The drive device according to claim 1 , further comprising a protective sleeve between the rotor end and an intermediate housing.

14. The drive device according to claim 1 , further comprising a support ring provided for rotating parts of the motor or gear transmission, wherein the support ring is arranged on a nut of a ball screw assembly, on the stator or on the component connected to the housing.

15. The drive device according to claim 1 , wherein the one or more bearings comprise at least two bearings.

16. The drive device according to claim 1 , further comprising a device provided for supporting torque of a non-rotating gear transmission part, wherein this device is provided on a side of the rotating gear transmission part which is opposite the bearing support.

17. The drive device according to claim 16 , wherein the device for supporting the torque is arranged in a housing of the drive device, outside the motor housing, in which pistons of a master cylinder are also arranged.

18. The drive device according to claim 1 , wherein the component connected to the motor housing part is connected on one side of the motor housing by crimping or caulking.

19. The drive device according to claim 18 , wherein the component connected to the motor housing part includes a collar configured for centering in the motor housing.

20. A drive device for modifying hydraulic pressure of a brake, comprising:
an inner rotor motor;
a gear transmission arranged to act on a piston of a hydraulic brake pressure modifier and comprising a rotating gear transmission part that is a nut or a spindle of a spindle gear, wherein the hydraulic brake pressure modifier is configured to act on the piston of the hydraulic brake pressure modifier;
a motor housing;
a stator with a winding and forming a part of the inner rotor motor;
a rotor with at least one permanent magnet, wherein the rotor is disposed radially inside the stator and forms a part of the inner rotor motor; and
at least one bearing provided for a bearing support of the rotor and a rotating gear transmission part,
wherein the at least one bearing for the rotor and rotating gear transmission part is/are arranged on a motor housing part or on a component firmly connected to the motor housing part,
wherein the at least one bearing lies radially between the spindle and the stator of the inner rotor motor,
wherein the at least one bearing is arranged on a component connected to or integrated with the rotating gear transmission part,
wherein the at least one bearing is/are arranged on only one side in the motor housing or on the motor housing part, wherein another side of the motor housing or motor housing part has no bearings, and wherein the only one side of the motor housing or motor housing part is defined by a side of a radial plane passing through the rotor, and which is oriented perpendicular to an axis of rotation of the rotating gear transmission part, so that bearing forces are at least substantially absorbed by the only one side of the motor housing or the motor housing part, and
wherein the hydraulic brake pressure modifier is located on the another side of the motor housing or the radial plane, having no bearings.

21. The drive device according to claim 20 , wherein the component connected to or integrated with the rotating gear transmission part is connected to a sensor drive.

22. The drive device according to claim 20 , wherein the nut of the ball screw assembly has at least one recess for reducing the rotating mass.

23. The drive device according to claim 20 , wherein the at least one bearing comprises at least two bearings.

Assignees

• Ipgate Ag

Inventors

• Leiber Heinz
• Unterfrauner Valentin
• Leiber Thomas

Classifications

• F16H2025/2078

  the rotor being integrated with the nut or screw body · CPC title

• B60T13/745

  acting on a hydraulic system, e.g. a master cylinder · CPC title

• H02K5/16 Primary

  Means for supporting bearings, e.g. insulating supports or means for fitting bearings in the bearing-shields (magnetic bearings H02K7/09) · CPC title

• H02K7/085

  radially supporting the rotary shaft at only one end of the rotor (H02K7/086, H02K7/09 take precedence) · CPC title

• H02K7/06

  Means for converting reciprocating motion into rotary motion or vice versa · CPC title