Air turbine drive spindle

Patent metadata

Field	Value
Publication number	US-11033915-B2
Application number	US-201716319618-A
Country	US
Kind code	B2
Filing date	Jul 7, 2017
Priority date	Aug 4, 2016
Publication date	Jun 15, 2021
Grant date	Jun 15, 2021

Abstract

An air turbine drive spindle includes a rotary shaft, a bearing portion, a damper ring, a cover member, and at least one or more O rings. The bearing portion surrounds at least a portion of an outer circumferential surface of the rotary shaft. The damper ring is disposed at the outer circumferential side relative to the bearing portion with a gap being interposed therebetween. The cover member is disposed at the outer circumference side relative to the damper ring with a gap being interposed therebetween, and is configured to store the rotary shaft, the bearing portion, and the damper ring. At least one or more O rings are disposed in each of the gap and the gap.

First claim

The invention claimed is:

1. An air turbine drive spindle comprising:
a rotary shaft;
a bearing portion configured to surround at least a portion of an outer circumferential surface of the rotary shaft;
a support member disposed at an outer circumferential side relative to the bearing portion with a first gap being interposed between the support member and the bearing portion;
a cover member disposed at the outer circumferential side relative to the support member with a second gap being interposed between the cover member and the support member, the cover member being configured to store the rotary shaft, the bearing portion, and the support member; and
at least one or more O rings disposed in each of the first gap and the second gap.

2. The air turbine drive spindle according to claim 1 , wherein at least one of the bearing portion, the support member, and the cover member has a surface that faces the first gap or the second gap and that is provided with at least one or more grooves with which the O rings are engaged.

3. The air turbine drive spindle according to claim 1 , wherein the bearing portion includes a bearing member disposed at the rotary shaft side, and a housing member disposed at the support member side.

4. The air turbine drive spindle according to claim 1 , wherein
a communication hole portion continuous to the first gap and the second gap is formed in at least one of the cover member and the support member,
the air turbine drive spindle further comprising a supply device configured to supply gas to the communication hole portion, wherein
the one or more O rings include a plurality of O rings for sealing, the plurality of O rings for sealing being disposed in the first gap and the second gap so as to sandwich the communication hole portion in a thrust direction of the rotary shaft.

5. The air turbine drive spindle according to claim 4 , wherein the one or more O rings include a plurality of O rings for damping, the plurality of O rings for damping being disposed so as to sandwich the plurality of O rings for sealing in the thrust direction of the rotary shaft.

6. The air turbine drive spindle according to claim 5 , wherein each of the plurality of O rings for sealing is composed of a material different from a material of each of the plurality of O rings for damping.

7. The air turbine drive spindle according to claim 5 , wherein each of the plurality of O rings for damping has a squeeze of less than 0.3 mm.

8. The air turbine drive spindle according to claim 1 , wherein a material of the support member includes a metal.

9. The air turbine drive spindle according to claim 1 , wherein a material of the support member includes a resin.

10. The air turbine drive spindle according to claim 1 , wherein
the support member is an annular member formed to surround the bearing portion, and
a cut is formed in an end portion of the support member in the thrust direction of the rotary shaft.

Assignees

• Ntn Toyo Bearing Co Ltd

Inventors

• Horiuchi Teruyoshi

Classifications

• F16C27/02 Primary

  Sliding-contact bearings · CPC title

• F16C32/0603

  supported by a gas cushion, e.g. an air cushion · CPC title

• F16J15/10

  with non-metallic packing · CPC title

• F16C32/0614

  the gas being supplied under pressure, e.g. aerostatic bearings · CPC title

• F01D25/162

  Bearing supports · CPC title