Patent US3624438A successfully refreshed from Google Patents.
US3624438A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air-cooled eddy current brake
Assignee: Robert Bosch GmbH
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Filing: 1971-01-29
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Granted: 1971-11-30
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Expires: 1991-01-29
Abstract
Abstract An eddy current brake wherein the rotor is braked and heated in response to energization of a coil in the stator. The rotor has a chamber which can receive cool atmospheric air by way of inlets machined into the rotor and sealable from the chamber by a valve which is carried by the stator. The rotor is further provided with blades which draw air into the chamber and expel such air into predetermined paths wherein the air exchanges heat with the stator and rotor when the valve is open. The opening of valve is controlled by electromagnets, thermostats or cylinder and piston units which cause the valve to open in response to energization of the coil and insure that the valve remains open for a predetermined or variable interval of time following deenergization of the coil to thus guarantee further cooling of the stator and rotor upon termination of a braking action.
Inventors
- 👤 Alfred Hoyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:35
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/02; H02K49/04; F; F16; F16D; F16D55/00; F16D65/00; F16D65/78; H02K49/043; F16D2065/783; F16D2121/00; F16D2121/18; F16D2121/20
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
179 words
An eddy current brake, particularly for use in automotive vehicles, comprising a rotary braking member; a coaxial second braking member, one of said members having coil means energizable to induce in the other member eddy currents with attendant application of a braking force to said rotary member and heating of said braking members; cooling means comprising coolant circulating means provided on said rotary member to circulate a coolant along at least one of said members and valve means openable to admit a fluid coolant into the range of said circulating means; actuating means operable to open said valve means; and control means for said coil means and for said actuating means, comprising starting means movable between an operative position in which said coil means is energized and said actuating means is operated to maintain said valve means in open position and an inoperative position in which said coil means is deenergized, and time delay means for terminating the operation of said actuating means to effect closing of said valve means with a delay following deenergization of said coil means.
Claim 2
Dependent Claim
179 words
An eddy current brake, particularly for use in automotive vehicles, comprising a rotary braking member; a coaxial second braking member, one of said members having coil means energizable to induce in the other member eddy currents with attendant application of a braking force to said rotary member and heating of said braking members; cooling means comprising coolant circulating means provided on said rotary member to circulate a coolant along at least one of said members and valve means openable to admit a fluid coolant into the range of said circulating means; actuating means operable to open said valve means; and control means for said coil means and for said actuating means, comprising starting means movable between an operative position in which said coil means is energized and said actuating means is operated to maintain said valve means in open position and an inoperative position in which said coil means is deenergized, and time delay means for terminating the operation of said actuating means to effect closing of said valve means with a delay following deenergization of said coil means.
Claim 3
Dependent Claim
56 words
A brake as defined in claim 1, wherein said time delay means comprises detector means for measuring the temperature of at least one of said braking members and for producing a signal in response to detection of a predetermined temperature, and a device for terminating the operation of said actuating means in response to said signal.
Claim 4
Dependent Claim
22 words
A brake as defined in claim 2, wherein said detector means comprises an NTC-resistor and said device comprises electric signal amplifier means.
Claim 5
Dependent Claim
26 words
A brake as defined in claim 3, wherein said resistor is provided on said second braking member and wherein said second braking member is a stator.
Claim 6
Dependent Claim
37 words
A brake as defined in claim 1, wherein said time delay means is arranged to terminate the operation of said actuating means with a predetermined delay following the movement of said starting means to said inoperative position.
Claim 7
Dependent Claim
87 words
A brake as defined in claim 1, wherein said actuating means comprises at least one electromagnet having a first condition of energization in which said valve means is open and a second condition of energization in which said valve means is closed, said starting means being arranged to place said electromagnet into said first condition in response to energization of said coil means and said time delay means being arranged to place said electromagnet into said second condition with said delay following deenergization of said coil means.
Claim 8
Dependent Claim
47 words
A brake as defined in claim 1, wherein said actuating means comprises at least one hydraulic cylinder and piston unit and electromagnetic valve means controlled by said starting means and said time delay means for regulating the flow of a hydraulic fluid to and from said unit.
Claim 9
Dependent Claim
47 words
A brake as defined in claim 1, wherein said actuating means comprises at least one pneumatic cylinder and piston unit and electromagnetic valve means controlled by said starting means and said time delay means for regulating the flow of a gaseous fluid to and from said unit.
Claim 10
Dependent Claim
63 words
A brake as defined in claim 1, wherein said actuating means comprises at least one heat-expansible element which is arranged to open said valve means in response to expansion thereof and heating means controlled by said starting means and said time-delay means for heating said element during an interval starting with energization of said coil means and ending upon completion of said delay.
Claim 11
Dependent Claim
22 words
A brake as defined in claim 9, wherein said heating means comPrises an electric resistance heater which is convoluted around said element.
Claim 12
Dependent Claim
22 words
A brake as defined in claim 9, wherein said element consists of a material characterized by rapid expansion in response to heating.
Claim 13
Dependent Claim
23 words
A brake as defined in claim 1, further comprising means for producing a detectable signal in response to operation of said actuating means.
Claim 14
Dependent Claim
28 words
A brake as defined in claim 1, wherein said second braking member is a stator and said coil means and said actuating means are mounted in said stator.
Claim 15
Dependent Claim
94 words
A brake as defined in claim 1, wherein said rotary member is provided with at least one coolant-receiving chamber and with inlet means for admitting atmospheric air into said chamber, said valve means being arranged to seal said inlet from said chamber in the closed position thereof and said circulating means comprising blade means provided on said rotary member and arranged to induce the flow of air into said chamber by way of said inlet and from said chamber along at least one of said members in the open position of said valve means.
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 |