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US3592297A Expired / Lapsed US ⏱️ 0.0 years remaining

Disc brake cooling

Assignee: Motors Liquidation Co
•
Filing: 1969-07-02
•
Granted: 1971-07-13
•
Expires: 1989-07-02
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Abstract

Abstract A disc brake cooling arrangement in which the rotating brake disc 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. The heat pipe assembly is provided as a part of each disc brake pad assembly, and is replaceable with the pad.

Inventors

  • 👤 Charles B Leffert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 10:33
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/78; F16D65/84; F16D2065/781

Claims Analysis

Total Claims: 7
Claim 1
Independent Claim 121 words
A disc brake pad assembly with a brake-cooling arrangement incorporated therein and comprising: a brake pad, a brake pad backing plate having said brake pad operatively secured thereto, a matrix operatively secured to said backing plate and having a plurality of heat pipes mounted therein and including portions extending therefrom, said heat pipes having evaporator sections and condenser sections and a suitable heat pipe fluid sealed therein, with said evaporator sections being in said matrix and receiving heat from said brake pad when said pad is braking a disc and said condenser sections being in said heat pipe extending portions, and means directing flow of a heat-absorbing fluid across said condenser sections to remove heat transported thereto by heat pipe operation.
Claim 2
Dependent Claim 121 words
A disc brake pad assembly with a brake-cooling arrangement incorporated therein and comprising: a brake pad, a brake pad backing plate having said brake pad operatively secured thereto, a matrix operatively secured to said backing plate and having a plurality of heat pipes mounted therein and including portions extending therefrom, said heat pipes having evaporator sections and condenser sections and a suitable heat pipe fluid sealed therein, with said evaporator sections being in said matrix and receiving heat from said brake pad when said pad is braking a disc and said condenser sections being in said heat pipe extending portions, and means directing flow of a heat-absorbing fluid across said condenser sections to remove heat transported thereto by heat pipe operation.
Claim 3
Dependent Claim 39 words
The disc brake pad assembly of claim 1, said backing plate extending with said heat pipes and having portions providing a framelike support for said heat pipes and vents through which the flow of said heat-absorbing fluid is directed.
Claim 4
Dependent Claim 39 words
The disc brake pad assembly of claim 1, said backing plate extending with said heat pipes and having portions providing a framelike support for said heat pipes and vents through which the flow of said heat-absorbing fluid is directed.
Claim 5
Dependent Claim 63 words
The disc brake pad assembly of claim 2, further comprising a deflector plate secured to an extended part of said backing plate and adapted to be in the airflow path of a ventilated disc with which the assembly may be used so as to deflect airflow from the disc in heat-absorbing relation with said heat pipe condenser sections, said heat-absorbing fluid being air.
Claim 6
Dependent Claim 41 words
The disc brake pad assembly of claim 2, said heat pipes being on the same side of said backing plate as said brake pad, said heat pipes and said backing plate extending outwardly in generally parallel relation to said brake pad.
Claim 7
Dependent Claim 17 words
The disc brake pad assembly of claim 4, said heat pipes extending outwardly in a fanlike configuration.

References Cited (Backward Citations)

US2821271A Cited
US3208559A Cited
US3277985A Cited
US3459284A Cited
US3481439A Cited

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

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