US3664468A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Self force-increasing disk brake
Assignee: Toyota Motor Corp
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Filing: 1970-01-05
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Granted: 1972-05-23
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Expires: 1990-01-05
Abstract
Abstract A disk brake is provided with means for intensifying the braking pressure. A friction member for engagement with a side of a rotary disk is fixed to a plate which is mounted at the front end of piston means for movement therewith and in a lateral direction. A pivoted lever is related to the plate so that one arm of the lever is cooperable with a side of the plate and a second arm is cooperable with the rear end of the piston means. When the piston means is actuated to cause engagement of the friction member with the side of the rotating disk, the friction member, which is moved laterally by virtue of its frictional engagement with the rotating disk, carries the plate with it and causes the plate to engage and rotate the lever, thereby causing the lever to exert an increased braking pressure upon the piston means and its associated friction member. Also, means is provided to compensate for the wear of the friction member or members; and the means is provided for maintaining the brake in engaged or parked condition.
Inventors
- 👤 Hiroyuki Oka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:40
CPC Classifications
F; F16; F16D; F16D55/00; F16D55/02; F16D55/22; F16D55/224; F16D55/225; F16D55/2255; F16D65/00; F16D65/38; F16D65/72; F16D65/74; F16D2127/00; F16D2127/08; F16D2127/085
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
134 words
A disk brake for vehicles comprising a rotary disk, a friction member for engagement with a side of the disk, a plate having the friction member fixed thereto, piston means, the plate being mounted at the front end of the piston means for movement therewith and laterally of the plane of movement of the piston means upon urging of the friction member when engaged with the rotary disk, and a pivoted lever having one arm engaged by a side of the plate and responsive to the lateral movement of the plate, and a second arm cooperable with the rear end of the piston means so that lateral movement of the plate is transmitted through the lever to the rear of the piston means to augment the force of the piston means on the plate.
Claim 2
Dependent Claim
134 words
A disk brake for vehicles comprising a rotary disk, a friction member for engagement with a side of the disk, a plate having the friction member fixed thereto, piston means, the plate being mounted at the front end of the piston means for movement therewith and laterally of the plane of movement of the piston means upon urging of the friction member when engaged with the rotary disk, and a pivoted lever having one arm engaged by a side of the plate and responsive to the lateral movement of the plate, and a second arm cooperable with the rear end of the piston means so that lateral movement of the plate is transmitted through the lever to the rear of the piston means to augment the force of the piston means on the plate.
Claim 3
Dependent Claim
38 words
A disk brake according to claim 1, wherein a thrust bearing is positioned intermediate the plate and the piston means, the plate is provided with laterally spaced, laterally elongated slots, and guide pins are extended through the slots.
Claim 4
Dependent Claim
123 words
A disk brake according to claim 1, wherein the piston means comprises a main cylinder having a main piston positioned therein, the plate being mounted on the front end of the main piston, the main piston having a central bore, an auxiliary piston fitted in the bore, the second arm of the lever being cooperable with the rear end of the auxiliary piston, a passage connecting a first chamber provided by the auxiliary piston, main piston and the main cylinder and a second chamber provided by the auxiliary piston and the main piston, a one-way valve in the passage to allow fluid to flow from the first chamber to the second chamber, and a fluid supply line in communication with the first chamber.
Claim 5
Dependent Claim
24 words
A disk brake according to claim 1, including spring means cooperable with the lever to urge the lever and the plate toward neutral position.
Claim 6
Dependent Claim
18 words
A disk brake according to claim 4, including means connected to the lever for manually rotating the lever.
Claim 7
Dependent Claim
49 words
A disk brake according to claim 1, including a second pivoted lever associated with the plate and the piston means, the second lever having an arm cooperable with the opposite side of the laterally movable plate and a second arm cooperable with the rear end of the piston means.
Claim 8
Dependent Claim
39 words
A disk brake according to claim 6, including a pivotally mounted yoke, the levers being pivotally connected to the yoke, and a second friction member engageable with the opposite sidE of the disk fixed for movement with the yoke.
Claim 9
Dependent Claim
38 words
A disk brake according to claim 7, wherein a thrust bearing is positioned intermediate the plate and the piston means, the plate is provided with laterally spaced, laterally elongated slots, and guide pins are extended through the slots.
Claim 10
Dependent Claim
40 words
A disk brake according to claim 8, including spring means cooperable with the levers to urge the levers and the plate toward neutral position, and means connected to one of the levers for manually rotating the lever and the yoke.
Claim 11
Dependent Claim
121 words
A disk brake according to claim 6, wherein the piston means comprises a main cylinder having a main piston positioned therein, the plate being mounted on the front end of the main piston, the main piston having a central bore, an auxiliary piston fitted in the bore, the second arm of each lever being cooperable with the rear end of the auxiliary piston, a passage connecting a first chamber provided by the auxiliary piston and the main cylinder and the second chamber provided by the auxiliary piston and the main piston, a one-way valve in the passage to allow fluid to flow from the first chamber to the second chamber, and a fluid supply line in communication with the first chamber.
Claim 12
Dependent Claim
39 words
A disk brake according to claim 10, including a pivotally mounted yoke, the levers being pivotally connected to the yoke, and a second friction member engageable with the opposite side of the disk fixed for movement with the yoke.
Claim 13
Dependent Claim
64 words
A disk brake according to claim 11, wherein a thrust bearing is positioned intermediate the plate and the main piston; wherein spring means is positioned intermediate the main cylinder and the second arm of each lever to urge the levers and the plate toward neutral position; and wherein means is connected to one of the levers for manually rotating the lever and its yoke.
Claim 14
Dependent Claim
75 words
The disk brake according to claim 1 further comprising support means for the piston means and wherein one end of the piston means is connected to the plate on the opposite side of the friction member, and the lever being L-shaped with two arms rotatably pivoted on the support means for the piston means, the arms of the lever respectively extending to the side of the plate and the rear end of the piston means.
Claim 15
Dependent Claim
67 words
The disk brake according to claim 13, wherein a pair of L-shaped levers are rotatably pivoted on the support means for the piston means, the levers disposed in symmetrical relation with respect to the longitudinal axis of the piston means, and each of the levers having two arms which respectively extend to the plate and to the rear end of the piston means to be cooperable therewith.
Claim 16
Dependent Claim
109 words
The disk brake according to claim 13, wherein the piston means comprises a hydraulic cylinder and a main piston and an auxiliary piston slidably fitting to each other, the main piston and auxiliary piston defining a chamber in the main piston, a one-way valve disposed in a passage in the auxiliary piston to permit fluid flow from a hydraulic pressure source to the chamber in the main piston, and sealing means disposed between the main piston and the hydraulic cylinder and between the main piston and auxiliary piston, the main piston being cooperable with the carrier plate, the auxiliary piston being cooperable with one arm of said L-shaped lever.
Claim 17
Dependent Claim
32 words
The disk brake according to claim 13, wherein the L-shaped lever is connected to manual means for effecting a rotary movement of the lever to urge the friction member to the disk.
Claim 18
Dependent Claim
80 words
The disk brake according to claim 16, wherein the piston means support member is movably mounted on a stationary portion of a vehicle to move in a direction substantially opposed to the advancing movement of the piston means, the piston means support member straddling the rotatable disk, the rotatable disk having opposing friction surfaces, and a second friction member between the disk and a portion of the piston means support member to engage the opposing friction surface of the disk.
Claim 19
Dependent Claim
34 words
The disk brake accordIng to claim 17, wherein the piston means support member is pivotally mounted on a stationary portion of a vehicle to move substantially perpendicular to the friction surface of the disk.
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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) | 1975-05-23 | 1975-11-22 | 1976-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-23 | 1979-11-22 | 1980-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-23 | 1983-11-22 | 1984-05-23 | $7700.00 | Window Closed / Lapsed |