Rotating apparatus having rotating electrical machine and reduction device with common rotating shaft

• US 9,166,457 B2
• Filed: 01/11/2012
• Issued: 10/20/2015
• Est. Priority Date: 01/11/2011
• Status: Active Grant

• Current Assignee: Sankyo Seiko Limited
• Original Assignee: Kabushiki Kaisha Yaskawa Denki, Sankyo Seiko Limited
• Inventors: Yamagishi, Toshiyuki, Miyauchi, Nobukazu, Matsuura, Kenji, Kato, Toshinao, Oishi, Atsushi, Takahashi, Toshiki
• Primary Examiner(s): Andrews, Michael
• Application Number:
  US13/347,699
• Publication Number:
  US 20120175982A1
• Time in Patent Office: 1,378 Days
• Field of Search: 310/83, 310/90, 384/517, 384/518, 384/519
• US Class Current: 1/1
• CPC Class Codes: F16H 1/166 with members rotating around axes on the worm or worm-wheel
• CPC Class Codes: H02K 11/225 Detecting coils
• CPC Class Codes: H02K 7/085 radially supporting the rotary shaft at only one end of the rotor H02K7/086, H02K7/09 take precedence
• CPC Class Codes: H02K 7/106 with dynamo-electric brakes
• 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 disclosure discloses a rotating electrical machine that is integrally formed with a reduction device having an input shaft to which a roller gear cam is provided and an output shaft to which cam followers configured to sequentially engage with the roller gear cam is provided on an outer periphery, extending along a direction orthogonal to the input shaft, and is configured to employ one of a field system or an armature as a rotator and the other of the field system or the armature as a stator, including a rotating shaft that is fixed to the rotator and integrally formed as a single shaft with the input shaft of the reduction device.

Claims

1. A rotating apparatus that integrally comprises a rotating electrical machine having one of a field system and an armature serving as a rotator and the other of the field system and the armature serving as a stator, and a reduction device, wherein:

said rotating electrical machine has a motor frame that houses said rotator on one side of said rotating apparatus;

said reduction device has;

a housing that is arranged on the other side of said rotating apparatus and houses an output shaft to which cam followers are provided on an outer periphery;

said rotating apparatus further comprises a common rotating shaft that is common to both said rotating electrical machine and said reduction device, is integrally formed into a single shaft, and is extended and ranges from said motor frame to said housing along a direction orthogonal to said output shaft, and

said rotator is fixed to an outer periphery of said common rotating shaft in said motor frame and a roller gear cam configured to sequentially engage with said cam followers is provided to an outer periphery of said common rotating shaft in said housing,

said reduction device comprises;

two bearings that are respectively disposed on either side of said roller gear cam along an axial direction in said housing and rotatably support said common rotating shaft; and

two bearing pre-compressing members that are respectively disposed on an outer side from each of said two bearings along the axial direction and respectively provide pre compression to each of said two bearings, and

at least one of said two bearing pre-compressing members comprises;

a screw-engaging portion wherein a screw portion that is screwed to said housing is formed on an outer periphery; and

a pre-compressing portion that is positioned on an inner side from said screw engaging portion along the axial direction, has a larger diameter than said screw-engaging portion, and contacts an outer ring of said bearing,

said rotating electrical machine comprises an encoder cover including a convex portion concentrically formed with said common rotating shaft, said convex portion inlaying an opening of said housing wherein said screw-engaging portion is screwed.

2. The rotating apparatus according to claim 1, further comprising an encoder provided on an end of said common rotating shaft opposite to an end of the common rotating shaft to which said rotating electrical machine is provided, said encoder being configured to detect an angle of rotation of the common rotating shaft.

3. The rotating apparatus according to claim 2, wherein said encoder cover covers the encoder.

4. The rotating apparatus according to claim 3, wherein an outer diameter of said encoder cover is smaller than an outer diameter of said two bearings.

5. The rotating apparatus according to claim 1, wherein an outer diameter of said encoder cover is smaller than an outer diameter of said two bearings.