Patent US147854A successfully refreshed from Google Patents.
US3592298A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Brake heat pipe cooling
Assignee: Motors Liquidation Co
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Filing: 1969-07-02
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Granted: 1971-07-13
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Expires: 1989-07-02
Abstract
Abstract A brake-cooling system in which the rotating brake friction surfaces are in heat transfer contact with the evaporator section of a heat pipe arrangement. The heat transferred during low levels of braking is transmitted to ambient air or other heat exchange means by conduction and convection. When sufficiently severe braking loads occur so that the conduction mode of heat transfer will not carry away the heat at a sufficient rate, the heat pipe liquid is vaporized and builds up vapor pressure to bring the heat pipe into efficient operation. As the cooling system quickly shifts into this mode of operation the entire heat pipe assembly in effect suddenly increases its thermal conductivity by several orders of magnitude and the heat is rapidly carried away to the heat pipe condenser section, where it is then removed by a suitable heat exchanger arrangement.
Inventors
- 👤 Charles B Leffert
- 👤 Lawrence R Hafstad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 01:33
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/78; F16D65/84; F16D2065/781; F16D2065/789
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
A brake assembly comprising: a rotatable member to be braked and being a disc having opposed annular braking surfaces; a brake apply assembly including means frictionally engaging said rotatable member for braking action; and brake-cooling means including heat-dispersing means a heat-conducting member receiving heat from said rotatable member by conduction a stationary heat pipe assembly having an evaporator section receiving heat from said heat conducting member, a condenser section positioned above said evaporator section and receiving heat transported by heat pipe operation from said evaporator section, said heat pipe assembly transferring heat to said heatdispersing means by conduction and by heat pipe operation and a pair of nonrotatable housings receiving said disc therebetween and each extending arcuately with the discbraking surfaces from a low point at which said evaporator section is located to a higher point at which said condenser section is located, each of said housings having at least one heat pipe therein.
Claim 2
Dependent Claim
154 words
A brake assembly comprising: a rotatable member to be braked and being a disc having opposed annular braking surfaces; a brake apply assembly including means frictionally engaging said rotatable member for braking action; and brake-cooling means including heat-dispersing means a heat-conducting member receiving heat from said rotatable member by conduction a stationary heat pipe assembly having an evaporator section receiving heat from said heat conducting member, a condenser section positioned above said evaporator section and receiving heat transported by heat pipe operation from said evaporator section, said heat pipe assembly transferring heat to said heatdispersing means by conduction and by heat pipe operation and a pair of nonrotatable housings receiving said disc therebetween and each extending arcuately with the discbraking surfaces from a low point at which said evaporator section is located to a higher point at which said condenser section is located, each of said housings having at least one heat pipe therein.
Claim 3
Dependent Claim
33 words
The brake assembly of claim 1, said housings each having a heat transfer pad engaging a disc-braking surface in conductive heat transfer relation and positioned with said evaporator section for heat transfer thereto.
Claim 4
Dependent Claim
35 words
The brake assembly of claim 1, said housings each extending arcuately to provide an annular configuration, said evaporator section being positioned in heat conductive relation with said frictionally engaging means of said brake apply assembly.
Claim 5
Dependent Claim
75 words
The brake assembly of claim 1, said brake apply assembly including a caliper housing having piston means for actuating said frictionally engaging means and backing plate means for said frictionally engaging means, said heat-conducting member including said frictionally engaging means and said backing plate means, said evaporator section being in heat-conducting surface engagement with said backing plate means and transmitting caliper applied braking force therethrough from said caliper housing to said disc annular braking surfaces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |