Patent US3952844A successfully refreshed from Google Patents.
US3952844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Helical cam actuator for a disc brake
Assignee: Girling Ltd
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Filing: 1975-01-13
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Granted: 1976-04-27
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Expires: 1995-01-13
Abstract
Abstract A reaction type disc brake is provided with a mechanical actuator in the form of a helical thrust bearing whose nonrotatable cam component is part of or fixed relatively to the caliper. The rotatable cam component is housed in the caliper and is axially displaceable as well as rotatable therein. The rotatable cam component acts on the directly operated brake pad assembly via an axial thrust bearing and the reaction thrust is received directly by the caliper and applied to the indirectly operated brake pad assembly. The rotatable cam component is turned by means of a laterally flexible member which extends into the housing and which is placed under tension. The lateral flexibility accommodates the axial travel of the rotatable cam component. The helical thrust bearing comprises bearing needles disposed between helical cam tracks on the rotatable and nonrotatable components.
Inventors
- 👤 Charles Newstead
- 👤 Robert Joseph Warnock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:58
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36; F16D2125/58
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
87 words
In a vehicle brake system: a mechanical brake actuator comprising relatively rotatable cam components, two complementary axially cooperating parallel helical cam tracks respectively on said cam components, and a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks said cam components being constructed and arranged that rotation of one of said cam components in an appropriate direction relative to the other of said cam components effects axial displacement of said one cam component relative to said other cam component.
Claim 2
Dependent Claim
87 words
In a vehicle brake system: a mechanical brake actuator comprising relatively rotatable cam components, two complementary axially cooperating parallel helical cam tracks respectively on said cam components, and a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks said cam components being constructed and arranged that rotation of one of said cam components in an appropriate direction relative to the other of said cam components effects axial displacement of said one cam component relative to said other cam component.
Claim 3
Dependent Claim
16 words
A mechanical brake actuator according to claim 1 in which said rolling members comprise bearing needles.
Claim 4
Dependent Claim
32 words
A mechanical brake actuator according to claim 1 which includes a housing, said other cam component being non rotatable in said housing and said one cam component being rotatable in said housing.
Claim 5
Dependent Claim
30 words
A mechanical brake actuator according to claim 3 further comprising an axial thrust bearing disposed at the opposite axial end of said rotatable cam component to said helical thrust bearing.
Claim 6
Dependent Claim
20 words
A mechanical brake actuator according to claim 4 in which said axial thrust bearing comprises a plurality of needle rollers
Claim 7
Dependent Claim
100 words
A mechanical actuator for a disc brake comprising a housing which includes a first component, a second component rotatably disposed in said housing, two complementary axially cooperating parallel helical cam tracks respectively on said cam components, a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks, rotation of said second component in an appropriate direction thereby effecting axial brake-applying displacement of that component relative to said first component, and means extending into said housing and engaging said second component for rotating the latter in said appropriate direction whilst permitting said axial displacement.
Claim 8
Dependent Claim
100 words
A mechanical actuator for a disc brake comprising a housing which includes a first component, a second component rotatably disposed in said housing, two complementary axially cooperating parallel helical cam tracks respectively on said cam components, a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks, rotation of said second component in an appropriate direction thereby effecting axial brake-applying displacement of that component relative to said first component, and means extending into said housing and engaging said second component for rotating the latter in said appropriate direction whilst permitting said axial displacement.
Claim 9
Dependent Claim
38 words
A mechanical actuator according to claim 6 in which the last-mentioned means comprises an elongate member which passes through an opening in said housing, said elongate member having lateral mobility so as not to hinder said axial displacement.
Claim 10
Dependent Claim
98 words
In a reaction type disc brake having a caliper: a mechanical actuator comprising a non-rotatable component on said caliper, a rotatable component housed in said caliper, two complementary axially cooperating parallel helical cam tracks respectively on said components, and a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks, said components being constructed and arranged that rotation of said rotatable component in an appropriate direction thereby effects axial brake thrust applying displacement of that component relative to said caliper whereby the caliper directly receives the reaction to said brake thrust.
Claim 11
Dependent Claim
98 words
In a reaction type disc brake having a caliper: a mechanical actuator comprising a non-rotatable component on said caliper, a rotatable component housed in said caliper, two complementary axially cooperating parallel helical cam tracks respectively on said components, and a helical thrust bearing between said components comprising a plurality of rolling members between said two cam tracks, said components being constructed and arranged that rotation of said rotatable component in an appropriate direction thereby effects axial brake thrust applying displacement of that component relative to said caliper whereby the caliper directly receives the reaction to said brake thrust.
Claim 12
Dependent Claim
68 words
A mechanical actuator according to claim 8 in which said caliper includes a housing integrally formed therewith, said rotatable component being disposed in said housing, said disc brake including opposed directly and indirectly operated brake pad assemblies and said actuator including a thrust bearing by which said rotatable component acts axially on said directly operated brake pad assembly, said caliper acting on said indirectly operated brake pad assembly.
Claim 13
Dependent Claim
38 words
A mechanical actuator according to claim 8 which further comprises an elongate member which passes through an opening in said housing, said elongate member having lateral mobility so as not to hinder said axial brake thrust applying displacement.
Claim 14
Dependent Claim
47 words
A mechanical actuator according to claim 9 which includes an elongate member extending into said housing and engaging said rotatable component for rotating the latter in said appropriate direction, said elongate member having lateral mobility so as not to hinder said axial displacement of said rotatable component.
Claim 15
Dependent Claim
27 words
A mechanical actuator according to claim 1 in which said helical thrust bearing further comprises a cage for said rolling members, said cage having a circumferential discontinuity.
Claim 16
Dependent Claim
22 words
A mechanical actuator according to claim 1 in which the rolling members disposed between said two cam tracks exceed three in number.
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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) | 1979-04-27 | 1979-10-27 | 1980-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-04-27 | 1983-10-27 | 1984-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-04-27 | 1987-10-27 | 1988-04-27 | $7700.00 | Window Closed / Lapsed |