Shift range switching device for vehicle

Patent metadata

Field	Value
Publication number	US-9732845-B2
Application number	US-201615166396-A
Country	US
Kind code	B2
Filing date	May 27, 2016
Priority date	May 29, 2015
Publication date	Aug 15, 2017
Grant date	Aug 15, 2017

Abstract

A shift range switching device of a vehicle includes a fixing member provided in a vicinity of an external-toothed gear, an electric motor, an eccentric shaft provided on an output shaft, the external-toothed gear rotatably supported by the eccentric shaft, and a ring-shaped double-toothed gear provided on an outer circumference of the external-toothed gear. The shift range switching device includes internal teeth defined on an inner circumference of the double-toothed gear and engaged with external teeth of the external-toothed gear and the external-toothed gear defined on an outer circumference of the double-toothed gear and engaged with an output gear. The shift range switching device includes a restriction portion provided on one of the external-toothed gear and the fixing member and a restricted portion provided on the other of the external-toothed gear and the fixing member and engaged with the restriction portion.

First claim

What is claimed is:

1. A shift range switching device of a vehicle, comprising:
an output gear which defines a driving source of shift range switching;
an electric motor and an eccentric shaft which is provided on an output shaft of the electric motor;
an external-toothed gear which is rotatably supported by the eccentric shaft;
a ring-shaped double-toothed gear which is provided on an outer circumference of the external-toothed gear;
internal teeth which are defined on an inner circumference of the double-toothed gear and engaged with external teeth of the external-toothed gear;
external teeth which are defined on an outer circumference of the double-toothed gear and engaged with the output gear;
a fixing member which is located adjacent to the external-toothed gear;
a restriction portion which is provided on one of the external-toothed gear and the fixing member; and
a restricted portion which is provided on the other of the external-toothed gear and the fixing member and engaged with the restriction portion; wherein the restriction portion and the restricted portion restrict rotation of the external-toothed gear with the external teeth of the external-toothed gear engaged with the internal teeth of the double-toothed gear; and
the external teeth of the external-toothed gear and the internal teeth of the double-toothed gear have different teeth numbers from each other in response to a reduction ratio.

2. The shift range switching device of the vehicle of claim 1 , wherein the external-toothed gear, the double-toothed gear and the outer gear are located in a same plane.

3. The shift range switching device of the vehicle of claim 1 , wherein the restriction portion is a round rod which is located in the fixing member, the restricted portion is a circular hole which is located in the external-toothed gear and a supporting pin is fitted into the circular hole.

4. The shift range switching device of the vehicle of claim 1 , wherein the fixing member is a case of a reduction mechanism.

5. The shift range switching device of the vehicle of claim 1 , wherein the fixing member is provided in the electric motor.

6. The shift range switching device of the vehicle of claim 1 , wherein the output shaft of the electric motor is supported to the fixing member with a bearing.

7. The shift range switching device of the vehicle of claim 1 , wherein, the double-toothed gear is supported by a slide bearing having a ring shape which is provided in the fixing member.

8. The shift range switching device of the vehicle of claim 1 , wherein the external teeth of the external-toothed gear and the internal teeth of the double-toothed gear have an arc tooth shape or a tooth shape where a portion of a trochoid tooth shape is removed.

Assignees

• Nidec Tosok Corp

Inventors

• Shinkai Kazumi
• Kinjo Shuichi

Classifications

• F16H1/32

  in which the central axis of the gearing lies inside the periphery of an orbital gear · CPC title

• F16H59/08 Primary

  Range selector apparatus · CPC title

• F16H2059/081

  using knops or discs for rotary range selection · CPC title

• F16H2061/326

  Actuators for range selection, i.e. actuators for controlling the range selector or the manual range valve in the transmission · CPC title

• F16H2061/2892

  other gears, e.g. worm gears, for transmitting rotary motion to the output mechanism · CPC title