Patent US3820635A successfully refreshed from Google Patents.
US3820635A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self adjusting disc brake with parking brake
Assignee: Motors Liquidation Co
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Filing: 1973-07-23
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Granted: 1974-06-28
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Expires: 1993-07-23
Abstract
Abstract Mechanical actuating means for a disc brake caliper includes a shaft rotatably journalled in the housing and having a threaded portion which threadedly engages a nut having integral circular plate. A second circular plate is interposed between the integral plate of the nut and the conventional hydraulic actuating piston. A one-way clutch is provided by ratchet teeth on the adjacent faces of the integral plate and second plate. A ball and ramp arrangement is provided between the second plate and the piston. Rotation of the shaft in one direction causes the nut to rotate therewith and the ratchet teeth to rotate the second plate which in turn causes the ball and ramp arrangement to move the piston axially to carry the brake shoe into engagement with the disc. Upon return of the shaft to its preactuation rotational position clearance will result in the mechanical actuating mechanism to an extent corresponding to the lining wear encountered. A spring causes the nut to rotate on the shaft in the direction axially toward the disc as permitted by ratcheting of the one-way clutch so that the effective length of the mechanical actuating mechanism is extended to adjust for the wear. Wear adjustment also occurs upon hydraulic actuation of the brake.
Inventors
- 👤 H Hurt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 18:56
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/14; F16D65/16; F16D65/18; F16D65/38; F16D65/40; F16D65/52; F16D65/56; F16D65/567; F16D2121/00; F16D2121/14; F16D2125/00; F16D2125/18; F16D2125/20; F16D2125/34; F16D2125/36
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
235 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft; a plate interposed between the nut and the piston; means acting between the plate and the piston to impart axial movement to the piston upon rotary movement of the plate; one-way clutch means effective between the plate and the nut to rotate the plate when the nut is rotated in one direction; the threaded engagement of the nut and shaft acting to rotate the nut in the one direction when the shaft is rotated in the one direction so that the means acting between the plate and piston acts to move tHe brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and toward the disc to adjust for brake shoe wear as permitted by the one-way clutch.
Claim 2
Dependent Claim
235 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft; a plate interposed between the nut and the piston; means acting between the plate and the piston to impart axial movement to the piston upon rotary movement of the plate; one-way clutch means effective between the plate and the nut to rotate the plate when the nut is rotated in one direction; the threaded engagement of the nut and shaft acting to rotate the nut in the one direction when the shaft is rotated in the one direction so that the means acting between the plate and piston acts to move tHe brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and toward the disc to adjust for brake shoe wear as permitted by the one-way clutch.
Claim 3
Dependent Claim
285 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft and having an integral plate, said plate having ratchet teeth including alternate axially extending and ramped surfaces on the face thereof facing toward the disc; a second plate interposed between the nut and the piston and having ratchet teeth mating the ratchet teeth of the nut; ball and ramp means acting between the plate and the piston to impart axial movement to the piston upon rotary movement of the second plate; the threaded engagement of the nut and shaft acting to rotate the nut in one direction when the shaft is rotated in the one direction and rotating the second plate by driving engagement of the axially extending surfaces so that the ball and ramp means acting between the second plate and piston acts to move the brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and axially toward the disc to adjust for wear as permitted by the ramped surfaces of the nut ratchet teeth riding up the ramped surfaces of the second plate ratchet teeth.
Claim 4
Dependent Claim
285 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft and having an integral plate, said plate having ratchet teeth including alternate axially extending and ramped surfaces on the face thereof facing toward the disc; a second plate interposed between the nut and the piston and having ratchet teeth mating the ratchet teeth of the nut; ball and ramp means acting between the plate and the piston to impart axial movement to the piston upon rotary movement of the second plate; the threaded engagement of the nut and shaft acting to rotate the nut in one direction when the shaft is rotated in the one direction and rotating the second plate by driving engagement of the axially extending surfaces so that the ball and ramp means acting between the second plate and piston acts to move the brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and axially toward the disc to adjust for wear as permitted by the ramped surfaces of the nut ratchet teeth riding up the ramped surfaces of the second plate ratchet teeth.
Claim 5
Dependent Claim
279 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft; a plate interposed between the nut and the piston; the plate and piston having paired ramped depressions in their adjacent faces; a rolling body seated in each pair of ramped depressions and effective to impart axial movement to the piston upon rotary movement of the plate; one-way clutch means effective between the plate and the nut to rotate the plate when the nut is rotated in one direction and permit rotation of the nut relative the plate in the other direction; the threaded engagement of the nut and shaft acting to rotate the nut in the one direction when the shaft is rotated in the one direction so that the one-way clutch rotates the plate and cooperation of the rolling bodies and ramped depressions moves the piston to carry the brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and toward the disc to irreversibly extend the effective length of the mechanical actuating means and thereby adjust for brake shoe wear.
Claim 6
Dependent Claim
279 words
A combination hydraulic actuating means, mechanical actuating means, and self-adjusting means for a disc brake assembly having a disc and a brake shoe assembly and comprising: a housing having a bore therein; a piston sealingly slidable in the bore and engaging the brake shoe assembly, said piston being advanceable to carry the brake shoe assembly into engagement with the disc; means preventing rotation of the piston in the housing; a shaft rotatably journalled in the housing and having a threaded portion extending into the bore; a nut threadedly engaged on the threaded portion of the shaft; a plate interposed between the nut and the piston; the plate and piston having paired ramped depressions in their adjacent faces; a rolling body seated in each pair of ramped depressions and effective to impart axial movement to the piston upon rotary movement of the plate; one-way clutch means effective between the plate and the nut to rotate the plate when the nut is rotated in one direction and permit rotation of the nut relative the plate in the other direction; the threaded engagement of the nut and shaft acting to rotate the nut in the one direction when the shaft is rotated in the one direction so that the one-way clutch rotates the plate and cooperation of the rolling bodies and ramped depressions moves the piston to carry the brake shoe assembly into frictional engagement with the disc; and spring means acting on the nut to rotate the nut in the other direction on the threaded portion of the shaft and toward the disc to irreversibly extend the effective length of the mechanical actuating means and thereby adjust for brake shoe wear.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-06-27 | 1977-12-27 | 1978-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-27 | 1981-12-27 | 1982-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-27 | 1985-12-27 | 1986-06-28 | $7700.00 | Window Closed / Lapsed |