Electric motor

Patent metadata

Field	Value
Publication number	US-9847699-B2
Application number	US-201314650386-A
Country	US
Kind code	B2
Filing date	Sep 6, 2013
Priority date	Sep 6, 2013
Publication date	Dec 19, 2017
Grant date	Dec 19, 2017

Abstract

A metal gear cover 43 , which is provided so as to cover a worm wheel housing 36 b , is disposed between a worm wheel 41 d and a circuit board 51 and grounded, thereby quickly introducing exogenous noise “ON” such as static electricity to the outside of the sunroof motor 21 , even if exogenous noise “ON” enters the sunroof motor 21 and reaches the gear cover 43 . Therefore, it is possible to surely prevent exogenous noise “ON” from being reflected to the circuit board 51 , and causing the circuit board 51 to malfunction and the like. Furthermore, it is possible to improve reliability of the sunroof motor 21.

First claim

What is claimed is:

1. An electric motor mounted on a vehicle, the electric motor comprising:
a yoke in which a rotating shaft is housed;
a casing connected to the yoke;
a speed reduction mechanism housing unit provided in the casing, wherein a speed reduction mechanism for reducing a rotation speed of the rotating shaft is housed in the speed reduction mechanism housing unit;
a board housing unit provided in the casing, and a circuit board for controlling a rotation of the rotating shaft;
a cover member made of metal, and provided between the speed reduction mechanism and the circuit board so as to cover the speed reduction mechanism housing unit; and
a contact plate made of metal, and held between the yoke and the casing;
wherein the cover member is grounded to a body of the vehicle via the contact plate.

2. The electric motor according to claim 1 , wherein
the contact plate has a connection terminal extending to the cover member,
the casing has a fitting hole, and
the cover member has a fitting claw which is fitted in the fitting hole of the casing, and electrically connected to the connection terminal of the contact plate.

Assignees

• Mitsuba Corp
• Webasto SE

Inventors

• Takamura Yuichi
• Lissner Werner
• Fersch Franz
• Meier Bernhard

Classifications

• H02K7/1166

  comprising worm and worm-wheel (structural association with bearings specially adapted for worm gear drives H02K7/081) · CPC title

• H02K11/01

  for shielding from electromagnetic fields {, i.e. structural association with shields} (means for preventing or reducing eddy-current losses in the winding heads by shielding H02K3/42) · CPC title

• H02K11/0005 Primary

  Electricity · mapped topic

• H02K11/40 Primary

  Structural association with grounding devices · CPC title

• H02K11/0141

  Shields associated with casings, enclosures or brackets · CPC title