Electric drive

• US 8,026,645 B2
• Filed: 12/05/2007
• Issued: 09/27/2011
• Est. Priority Date: 01/19/2007
• Status: Expired due to Fees

• Current Assignee: Robert Bosch GmbH
• Original Assignee: Robert Bosch GmbH
• Inventors: Martin, Norbert, Koesters, Matthias, Heyder, Martin, Stubner, Armin
• Primary Examiner(s): NGUYEN, HANH N
• Application Number:
  US12/523,574
• Publication Number:
  US 20100117470A1
• Time in Patent Office: 1,392 Days
• Field of Search: 310/239, 310/88, 310/68.R, 310/83, 130/83
• US Class Current: 310/88
• CPC Class Codes: B60S 1/166 characterised by the combination of a motor-reduction unit and a mechanism for converting rotary into oscillatory movement
• CPC Class Codes: H02K 11/026 Suppressors associated with brushes, brush holders or their supports
• CPC Class Codes: H02K 7/1166 comprising worm and worm-wheel structural association with bearings specially adapted for worm gear drives H02K7/081

Abstract

The invention relates to an electric drive, particularly a windshield wiper drive for vehicles, comprising an electric motor (10) in a crucible-shaped, preferably metal, motor housing (14), a gearbox housing (16) that is attached to the motor housing (14), and an arrangement for the interference suppression of the motor (10). According to the invention, at least one choke coil (46, 48) for the interference suppression of the motor (10) is disposed in the transition region from the motor housing (14) to the gearbox housing (16), wherein in this transition region means (36, 56) are provided in order to shield the filtered coil end (47, 49) projecting into the gearbox housing (16) from the interfering radiation produced by the motor (10).

Claims

1. An electric drive having an electric motor (10) in a pot-like motor housing (14), having a gear mechanism housing (16) which is attached to the motor housing (14), and having an arrangement for radio interference suppression of the motor (10), characterized in that at least one choke coil (46, 48) for radio interference suppression is arranged in a transition region from the motor housing (14) to the gear mechanism housing (16), the transition region having portions in both the motor housing (14) and the gear mechanism housing (16) such that a first portion of the at least one choke (46, 48) is in the motor housing (14) and a second portion of the at least one choke (46, 48) is in the gear mechanism housing (16), and in that means (36, 56) are provided in the transition region in order to shield a filtered coil end (47, 49) which projects into the gear mechanism housing (16) from the interfering radiation generated by the motor (10).

2. The electric drive as claimed in claim 1, characterized in that the gear mechanism housing (16) is composed of metal.

3. The electric drive as claimed in claim 2, characterized in that the gear mechanism housing (16) is composed of aluminum or an aluminum alloy.

4. The electric drive as claimed in claim 2, characterized in that a bearing plate (36) is integrally formed on the gear mechanism housing (16) and covers an end face (17) of the motor housing (14) which faces the gear mechanism housing (16) while leaving free a cutout (40) to allow a drive shaft (20) of the motor (10) to pass through and at least one further cutout (42) to allow at least one choke coil (46, 48) to pass through.

5. The electric drive as claimed in claim 4, characterized in that the at least one choke coil (46, 48) is arranged axially parallel to the drive shaft (20) of the motor (10).

6. The electric drive as claimed in claim 5, characterized in that the at least one choke coil (46, 48) is arranged with a relatively large portion of its overall length in the motor housing (14) and projects into the gear mechanism housing (16) only by way of its filtered end (47, 49).

7. The electric drive as claimed in claim 6, characterized in that two choke coils (46, 48) are arranged axially parallel to one another and to a motor axis (20) and are joined with at least one capacitor (50, 52, 54) to form an interference suppression module.

8. The electric drive as claimed in claim 7, characterized in that two choke coils (46, 48) and one capacitor (50) are combined in a plastic mount (44), which is fixed in the gear mechanism housing (16), to form an interference suppression module.

9. The electric drive as claimed in claim 8, characterized in that a substantially plate-like metal bearing holder (50) which covers a commutator (22) is arranged on a motor side of the bearing plate (36) of the gear mechanism housing (16) as an additional shield for the commutator region.

10. The electric drive as claimed in claim 1, characterized in that a bearing plate (36) is integrally formed on the gear mechanism housing (16) and covers an end face (17) of the motor housing (14) which faces the gear mechanism housing (16) while leaving free a cutout (40) to allow a drive shaft (20) of the motor (10) to pass through and at least one further cutout (42) to allow at least one choke coil (46, 48) to pass through.

11. The electric drive as claimed in claim 1, characterized in that the at least one choke coil (46, 48) is arranged axially parallel to the drive shaft (20) of the motor (10).

12. The electric drive as claimed in claim 1, characterized in that the at least one choke coil (46, 48) is arranged with a relatively large portion of its overall length in the motor housing (14) and projects into the gear mechanism housing (16) only by way of its filtered end (47, 49).

13. The electric drive as claimed in claim 1, characterized in that two choke coils (46, 48) are arranged axially parallel to one another and to a motor axis (20) and are joined with at least one capacitor (50, 52, 54) to form an interference suppression module.

14. The electric drive as claimed in claim 1, characterized in that two choke coils (46, 48) and one capacitor (50) are combined in a plastic mount (44), which is fixed in the gear mechanism housing (16), to form an interference suppression module.

15. The electric drive as claimed in claim 1, characterized in that a substantially plate-like metal bearing holder (50) which covers a commutator (22) is arranged on a motor side of the bearing plate (36) of the gear mechanism housing (16) as an additional shield for the commutator region.

16. The electric drive as claimed in claim 1, characterized in that the motor housing (14) is composed of metal.

17. An electric drive having an electric motor (10) in a pot-like motor housing (14), having a gear mechanism housing (16) which is attached to the motor housing (14), and having an arrangement for radio interference suppression of the motor (10), characterized in that

at least one choke coil (46, 48) for radio interference suppression is arranged in a transition region from the motor housing (14) to th gear mechanism housing (16);

means (36, 56) are provided in the transition region in order to shield a filtered coil end (47, 49) which projects into the gear mechanism housing (16) from the interfering radiation generated by the motor (10); and

a bearing plate (36) is integrally formed on the gear mechanism housing (16) and covers an end face (17) of the motor housing (14) which faces the gear mechanism housing (16) while leaving free a cutout (40) to allow a drive shaft (20) of the motor (10) to pass through and at least one further cutout (42) to allow at least one choke coil (46, 48) to pass through.

18. The electric drive as claimed in claim 17, characterized in that the at least one choke coil (46, 48) is arranged axially parallel to the drive shaft (20) of the motor (10).

20. The electric drive as claimed in claim 17, characterized in that two choke coils (46, 48) are arranged axially parallel to one another and to a motor axis (20) and are joined with at least one capacitor (50, 52, 54) to form an interference suppression module.

21. The electric drive as claimed in claim 17, characterized in that two choke coils (46, 48) and one capacitor (50) are combined in a plastic mount (44), which is fixed in the gear mechanism housing (16), to form an interference suppression module.

19. The electric drive as claimed in 17, characterized in that the at least one choke coil (46, 48) is arranged with a relatively large portion of its overall length in the motor housing (14) and projects into the gear mechanism housing (16) only by way of its filtered end (47, 49).

22. An electric drive having an electric motor (10) in a pot-like motor housing (14), having a gear mechanism housing (16) which is attached to the motor housing (14), and having an arrangement for radio interference suppression of the motor (10), characterized in that

at least one choke coil (46, 48) for radio interference suppression is arranged in a transition region from the motor housing (14) to the gear mechanism housing (16),

means (36, 56) are provided in the transition region in order to shield a filtered coil end (47, 49) which projects into the gear mechanism housing (16) from the interfering radiation generated by the motor (10), and

a substantially plate-like metal bearing holder (50) which covers a commutator (22) is arranged on a motor side of the bearing plate (36) of the gear mechanism housing (16) as an additional shield for the commutator region.