US4383593A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically and mechanically operable disc brakes
Assignee: ZF International UK Ltd
•
Filing: 1981-04-28
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Granted: 1983-05-17
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Expires: 2001-04-28
Abstract
Abstract A housing for a disc brake incorporates an expander mechanism formed by two pressure plates and, a stack of friction discs between one plate and a braking surface, and a single friction disc between the other plate and another braking surface. The one plate is formed by separate inner and outer concentric rings, and the inner ring and the other plate are slidably coupled against relative angular movement. In normal braking an annular piston works in an annular hydraulic cylinder in the other plate to urge the inner ring and the plate axially apart so that the single friction disc engages with the braking surface and the inner ring engages with a corresponding inner ring of friction lining material on the adjacent disc of the stack, thus urging the stack into engagement with the braking surface. The brake can also be applied mechanically through a transmission member or by an hydraulic actuator by moving the outer ring angularly with respect to the other plate causing balls to ride out of inclined recesses in adjacent faces of the outer ring and plate so that the outer ring engages with a corresponding outer ring of friction lining material on the adjacent disc of the stack. In this manner of operation a servo effect is obtained and helical movement of the annular piston is eliminated.
Inventors
- 👤 Sigma Micke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:30
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/04; F16D55/14; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
301 words
A disc brake comprising a stationary housing having at least one radial surface, at least one rotatable friction disc in said housing adapted to cooperate with said radial surface to apply said brake, actuating means for urging said friction disc into cooperation with said radial surface, hydraulically operable means for applying said brake, a supply of hydraulic fluid for supplying fluid to said hydraulically operable means, and mechanically operable means for applying said brake for parking or emergency braking, said actuating means incorporating at least one pressure plate and a complementary member, adjacent faces of said pressure plate and said complementary member having complementary oppositely inclined recesses, balls located in said oppositely inclined recesses, and an hydraulic piston and cylinder assembly for urging said pressure plate into engagement with said friction disc, said pressure plate comprising separate inner and outer concentric rings and said friction disc carrying complementary inner and outer regions of friction lining material, said piston and cylinder assembly acting directly on one of said rings, to urge it axially into engagement with a complementary one of said regions of said friction lining material so that said friction disc is urged into cooperation with said radial surface, said recesses being disposed in the other of said rings so that upon relative angular movement between said other ring and said complementary member said other ring moves axially into engagement with the other of said regions of said friction lining material due to a camming effect of said balls as they tend to ride out of said recesses so that said friction disc is urged into cooperation with said radial surface, said piston and cylinder assembly being operated from said supply of hydraulic fluid, and said other ring being angularly movable independently of said one ring by said mechanically operable means.
Claim 2
Dependent Claim
301 words
A disc brake comprising a stationary housing having at least one radial surface, at least one rotatable friction disc in said housing adapted to cooperate with said radial surface to apply said brake, actuating means for urging said friction disc into cooperation with said radial surface, hydraulically operable means for applying said brake, a supply of hydraulic fluid for supplying fluid to said hydraulically operable means, and mechanically operable means for applying said brake for parking or emergency braking, said actuating means incorporating at least one pressure plate and a complementary member, adjacent faces of said pressure plate and said complementary member having complementary oppositely inclined recesses, balls located in said oppositely inclined recesses, and an hydraulic piston and cylinder assembly for urging said pressure plate into engagement with said friction disc, said pressure plate comprising separate inner and outer concentric rings and said friction disc carrying complementary inner and outer regions of friction lining material, said piston and cylinder assembly acting directly on one of said rings, to urge it axially into engagement with a complementary one of said regions of said friction lining material so that said friction disc is urged into cooperation with said radial surface, said recesses being disposed in the other of said rings so that upon relative angular movement between said other ring and said complementary member said other ring moves axially into engagement with the other of said regions of said friction lining material due to a camming effect of said balls as they tend to ride out of said recesses so that said friction disc is urged into cooperation with said radial surface, said piston and cylinder assembly being operated from said supply of hydraulic fluid, and said other ring being angularly movable independently of said one ring by said mechanically operable means.
Claim 3
Dependent Claim
40 words
A disc brake as claimed in claim 1, wherein said piston and cylinder assembly comprises an annular hydraulic cylinder and an annular piston working in said cylinder, said one ring and said cylinder being slidably coupled against relative angular movement.
Claim 4
Dependent Claim
102 words
A disc brake as claimed in claim 2, further comprising another radial surface in the stationary housing and another rotatable friction disc adapted to cooperate with said other radial surface, said complementary member comprising another pressure plate for engagement with said other friction disc, and said hydraulic cylinder being defined in said other pressure plate so that said piston works in said cylinder to urge said one ring and said other pressure plate axially apart into respective engagement with said one and said other friction discs thus urging said friction discs into respective co-operation with said radial surfaces to apply said brake.
Claim 5
Dependent Claim
85 words
A disc brake as claimed in claim 3, wherein angularly spaced guide pins are provided for keying said other pressure plate to said one ring, a stop abutment is provided in the housing, and lugs are provided on said other pressure plate for engagement with said stop abutment, said guide pins keying said other pressure plate for axial movement relative to said one ring, and said engagement of said lugs with said stop abutment guiding said other pressure plate against rotation relative to said housing.
Claim 6
Dependent Claim
23 words
A disc brake as claimed in claim 1, incorporating an hydraulic actuator for urging said other ring angularly relative to said complementary member.
Claim 7
Dependent Claim
67 words
A disc brake as claimed in claim 5, wherein a radial lug is provided on said outer concentric ring, said mechanically operable means and said hydraulic actuator both acting on said radial lug to urge said outer concentric ring angularly relative to said complementary member, and said annular piston and cylinder assembly acting on said inner concentric ring to urge it axially away from said complementary member.
Claim 8
Dependent Claim
43 words
A disc brake as claimed in claim 6, wherein said hydraulic actuator comprises another hydraulic piston and cylinder assembly, said other piston and cylinder assembly also acting on said radial lug to urge said outer concentric ring angularly relative to said complementary member.
Claim 9
Dependent Claim
56 words
A disc brake as claimed in claim 6, wherein a complementary radial lug is provided on said complementary member and a toggle linkage is coupled to said radial lugs, said hydraulic actuator and said mechanically operable means both acting through said linkage to cause said outer concentric ring to move angularly relative to said complementary member.
Claim 10
Dependent Claim
61 words
A disc brake as claimed in claim 6, wherein a stop member is provided in the housing, said radial lug on said outer concentric ring being engageable in a retracted position with said stop member, and said stop member being adjustable to alter said retracted position in order to compensate for wear of said friction lining material on said friction disc.
Claim 11
Dependent Claim
23 words
A disc brake as claimed in claim 1, wherein said friction disc carries separate inner and outer concentric rings of friction lining material.
Claim 12
Dependent Claim
16 words
A disc brake as claimed in claim 10, wherein said friction disc comprises a single plate.
Claim 13
Dependent Claim
37 words
A disc brake as claimed in claim 10, wherein said friction disc comprises separate inner and outer concentric friction rings splined together for relative axial movement, each friction ring carrying a corresponding ring of friction lining material.
Claim 14
Dependent Claim
76 words
A disc brake as claimed in claim 10, incorporating a stack of friction discs disposed between said pressure plate and said radial surface in the housing, said stack comprising a plurality of rotatable friction discs, each adjacent pair of said rotatable friction discs having disposed therebetween a relatively stationary friction disc, and each rotatable friction disc comprising a metal plate which carries on opposite sides two separate concentric inner and outer rings of friction lining material.
Claim 15
Dependent Claim
50 words
A disc brake as claimed in claim 13, wherein the rotatable friction disc in said stack which is adjacent to said pressure plate comprises separate inner and outer concentric friction rings which are splined together for relative axial movement, each friction ring carrying a corresponding ring of friction lining material.
Claim 16
Dependent Claim
21 words
A disc brake as claimed in claim 10, wherein said separate concentric rings of lining material have different co-efficients of friction.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-05-16 | 1986-11-15 | 1987-05-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-05-16 | 1990-11-15 | 1991-05-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-05-16 | 1994-11-15 | 1995-05-17 | $7700.00 | Window Closed / Lapsed |