EP0367387A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Eddy current retarder
Assignee: Nippon Steel Corp
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Filing: 1989-08-30
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Granted: —
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Expires: 2009-08-30
Abstract
Abstract An eddy current retarder includes a rotor (3) fitted over a rotating shaft (1) at one end thereof and a support ring (7) around which a plurality of permanent magnets (10) are circumferentially provided in such a manner that the polarities of any adjacent magnets become opposite to each other. The support ring (7) is provided such that it is allowed to move back and forth in the axial direction of the rotating shaft (1) from a first position where the pole surfaces of the permanent magnets (10) fully confront the rotor (3) with a predetermined gap being secured therebetween to a second position where the former fully deviate from the latter. A boss portion (22) of the rotor (3) adapted to confront the permanent magnets (10) circumferentially provided around the support ring (7) and a cylindrical portion of the same are connected to each other by means of a support member (31), and this support member (31) comprises a fan (30) having axial blades (35) and radial blades (36) formed, respectively, radially inwardly and radially outwardly of the support member (31). Stator blades (37) are circumferentially provided close to the axial blades (35) on a bearing housing tube (4) fitted over the rotating shaft (1), and cooling fins (28) are radially provided on the external circumferential surface of the bearing housing tube (4) in such a manner as to protrude therefrom.
Inventors
- 👤 Kenji Araki
- 👤 Jyunichi Miyamae
- 👤 Takashi Kobayashi
- 👤 Akira Saito
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 07:57
CPC Classifications
F; F16; F16D; F16D27/00; H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
179 words
An eddy current reduction gear comprising: a rotor (3) fixed to one end of a rotating shaft (1); a support ring (7) coaxial with said rotor (3) and axially slidably mounted on a fixed main body (5, 6, 11, 21) with a predetermined gap being secured between said rotor (3) and itself; a plurality of permanent magnets (10) mounted on the external circumferential surface of said support ring (7) in such a manner that their magnetic poles are aligned in a direction parallel to the axis of said support ring (7) and that the polarities of any adjacent permanent magnets of said plurality of permanent magnets (10) become opposite to each other; and a shifting mechanism (13, 14, 16, 18, 19, 20) for axially shifting said support ring (7) between a first position where the pole surfaces of all of said permanent magnets (10) confront the internal circumferential surface of said rotor (3) and a second position where said pole surfaces of all of said permanent magnets (10) substantially deviate from said internal circumferential surface of said rotor (3).
Claim 2
Dependent Claim
179 words
An eddy current reduction gear comprising: a rotor (3) fixed to one end of a rotating shaft (1); a support ring (7) coaxial with said rotor (3) and axially slidably mounted on a fixed main body (5, 6, 11, 21) with a predetermined gap being secured between said rotor (3) and itself; a plurality of permanent magnets (10) mounted on the external circumferential surface of said support ring (7) in such a manner that their magnetic poles are aligned in a direction parallel to the axis of said support ring (7) and that the polarities of any adjacent permanent magnets of said plurality of permanent magnets (10) become opposite to each other; and a shifting mechanism (13, 14, 16, 18, 19, 20) for axially shifting said support ring (7) between a first position where the pole surfaces of all of said permanent magnets (10) confront the internal circumferential surface of said rotor (3) and a second position where said pole surfaces of all of said permanent magnets (10) substantially deviate from said internal circumferential surface of said rotor (3).
Claim 3
Dependent Claim
23 words
An eddy current reduction gear according to Claim 1, wherein said permanent magnets (10) comprise rare earth magnets having a strong magnetic force.
Claim 4
Dependent Claim
28 words
An eddy current reduction gear according to Claim 1 or 2, wherein a pole piece is adhered to the external surface of each of said permanent magnets (10).
Claim 5
Dependent Claim
70 words
An eddy current reduction gear according to Claim 1,2 or 3, wherein said permanent magnets (10) are integrally fastened to said support ring (7) formed from a ferromagnetic material via metal presser members (72) formed from a non-magnetic material by means of fastening components (73) formed from a non-magnetic material and wherein a heat-resistant resilient material (75) is inserted between said metal presser member (72) and said permanent magnet (10).
Claim 6
Dependent Claim
57 words
An eddy current reduction gear according to any one of the preceding Claims, wherein said shifting mechanism comprises an air cylinder (40) and wherein a spring (43) is employed to perform the return stroke by the action of its elastic force in which said support ring (7) is shifted from said first position to said second position.
Claim 7
Dependent Claim
104 words
An eddy current reduction gear according to any one of the preceding Claims, wherein electrically conductive rings (51) are provided at the ends of the internal circumferential surface of said rotor (3), wherein a plurality of electrically conductive slots (52) are provided on said internal circumferential surface in such a manner as to extend between said electrically conductive rings (51) in a direction parallel to the axis of said rotating shaft (1), and wherein the ends of said respective electrically conductive slots (52) are connected to said electrically conductive rings (51) so as to form eddy current paths (53) on said internal circumferential surface.
Claim 8
Dependent Claim
103 words
An eddy current reduction gear as claimed in any one of the preceding claims, further comprising: a fan (30) having axial blades (35) and radial blades (36) formed, respectively, radially inwardly and radially outwardly of a support member (31) connecting a boss portion (22) of said rotor (3) and a cylindrical portion (32) of the same; stator blades (37) formed close to said axial blades (35) on a bearing member (4) supporting said rotating shaft (1) in such a manner as to extend along the circumference thereof; and cooling fins (28) radially disposed on the external circumferential surface of said bearing member (4).
Claim 9
Dependent Claim
81 words
An eddy current reduction gear according to Claim 7, wherein a cylinder (121) is provided between the internal circumferential surface of the cylindrical portion of said rotor (3) and the external surfaces of said permanent magnets (10), wherein said cylinder (121) is fixed to said fixed main body (11), wherein said cylinder (121) is formed from a non-magnetic material, and wherein plates (122) formed from a ferromagnetic material are placed in said cylinder (121) at positions confronting said permanent magnets (10).
Claim 10
Dependent Claim
68 words
An eddy current reduction gear according to Claim 7, wherein said permanent magnets (10) are integrally fastened to said support ring (7) formed from a ferromagnetic material via metal presser members (72) formed from a non-magnetic material by means of fastening components (73) formed from a non-magnetic material and wherein a heat-resistant resilient material (75) is inserted between said metal presser member (72) and said permanent magnet (10).
References Cited (Backward Citations)
No citation records indexed.
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