US3624437A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Eddy current brake
Assignee: Robert Bosch GmbH
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Filing: 1971-01-18
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Granted: 1971-11-30
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Expires: 1991-01-18
Abstract
Abstract An eddy current brake wherein a cupped rotor surrounds the coil and the pole shoes of the stator and is provided with inlets for admission of cool air when the coil is excited to produce in the rotor eddy currents with attendant generation of heat. The rotor has blades which serve to draw air into an internal rotor chamber and to circulate such air along the surfaces of the stator and rotor when the coil is excited. The inlets are controlled by a valve which is mounted in the stator and is movable between closed and open positions by actuating means which are also mounted in the stator. Such actuating means comprises electromagnets or temperature-responsive devices which employ heat-expandible elements.
Inventors
- 👤 Alfred Hoyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:09
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; H02K49/043
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
153 words
In an eddy current brake, particularly for use in automotive vehicles, a combination comprising a stator member; a rotor member rotatable with reference to said stator member; coil means mounted in said stator member and energizable to produce in said rotor member eddy currents with attendant application of a braking force and heating of said members; cooling means comprising coolant-admitting inlet means provided on said rotor member, coolant-circulating means provided on said rotor member to circulate along at least one of said members a coolant which is admitted by way of said inlet means, and valve means provided on said stator member and movable between open and closed positions in which it respectively permits and prevents entry of coolant into the range of said circulating means by way of said inlet means; and actuating means provided on said stator member and operable to move said valve means between said open and closed positions.
Claim 2
Dependent Claim
153 words
In an eddy current brake, particularly for use in automotive vehicles, a combination comprising a stator member; a rotor member rotatable with reference to said stator member; coil means mounted in said stator member and energizable to produce in said rotor member eddy currents with attendant application of a braking force and heating of said members; cooling means comprising coolant-admitting inlet means provided on said rotor member, coolant-circulating means provided on said rotor member to circulate along at least one of said members a coolant which is admitted by way of said inlet means, and valve means provided on said stator member and movable between open and closed positions in which it respectively permits and prevents entry of coolant into the range of said circulating means by way of said inlet means; and actuating means provided on said stator member and operable to move said valve means between said open and closed positions.
Claim 3
Dependent Claim
18 words
A combination as defined in claim 1, wherein said valve means is moVable axially of said rotor member.
Claim 4
Dependent Claim
27 words
A combination as defined in claim 2, wherein said actuating means comprises displacing means and a motion transmitting linkage connecting said displacing means with said valve means.
Claim 5
Dependent Claim
16 words
A combination as defined in claim 3, wherein said displacing means comprises at least one electromagnet.
Claim 6
Dependent Claim
70 words
A combination as defined in claim 1, wherein said actuating means comprises at least one electromagnet and further comprising control means for energizing said electromagnet, said control means comprising temperature responsive detector means arranged to measure the temperature of at least one of said members and to produce a signal in response to detection of a predetermined temperature, and amplifier means for energizing said electromagnet in response to said signal.
Claim 7
Dependent Claim
35 words
A combination as defined in claim 1, wherein said actuating means comprises electromagnet means and motion transmitting means for moving said valve means to said closed position in response to energization of said electromagnet means.
Claim 8
Dependent Claim
36 words
A combination as defined in claim 1, wherein said actuating means comprises at least one electromagnet and motion transmitting means for moving said valve means to said closed position in response to deenergization of said electromagnet.
Claim 9
Dependent Claim
37 words
A combination as defined in claim 1, wherein said actuating means comprises at least one temperature-responsive device and motion transmitting means for moving said valve means to said open position in response to heating of said device.
Claim 10
Dependent Claim
29 words
A combination as defined in claim 8, wherein said device comprises a heat-expansible element and heating means for heating said element in response to energization of said coil means.
Claim 11
Dependent Claim
117 words
A combination as defined in claim 1, wherein said stator member is a ring-shaped member and said rotor member is coaxial with and surrounds at least a portion of said stator member, said rotor member having an end wall and said inlet means being provided in said end wall, said end wall further having a chamber communicating with said inlet means in the open position of said valve means and said circulating means being arranged to draw a coolant into said chamber in the open position of said valve means and to expel the thus drawn coolant from said chamber along a plurality of paths wherein the coolant exchanges heat with at least one of said members.
References Cited (Backward Citations)
US2440551A
Cited
FR1174034A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |