US3684061A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Disc brake
Assignee: Toyota Motor Sales Co Ltd
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Filing: 1970-05-01
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Granted: 1972-08-15
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Expires: 1990-05-01
Abstract
Abstract A disc brake of simple construction wherein an intermediate member such as a metal powder sintered product retaining lubricating material such as oils and fats is provided between the pad and the piston, and a protecting cover is fitted to said intermediate member to prevent the leakage of said lubricating material and to retain the lubricating material for a long time, thereby reducing the frictional force between opposed surfaces of the pad and the piston and preventing brake squeal for a long time.
Inventors
- 👤 Tokuo Ogawa
- 👤 Tatsumi Sakano
- 👤 Shigeyoshi Okamura
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:16
CPC Classifications
F; F16; F16D; F16D65/00; F16D65/78; F16D65/84; F16D55/00; F16D55/02; F16D55/22; F16D55/228; F16D65/0006; F16D65/02; F16D65/04; F16D65/092; F16D65/14; F16D65/16; F16D65/18; F16D2121/00; F16D2121/02
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
110 words
A disc brake including a rotatable disc, a caliper straddling a portion of the periphery of said disc, a pad of friction material associated with said caliper and opposed to said disc, an axially movable piston in said caliper, and pressure fluid actuating means for moving said piston to force said pad into frictional engagement with said disc for braking action, in combination with an intermediate member molded in the form of a plate of sintered metal powder and impregnated with lubricating material positioned between the opposed surfaces of said pad and piston, whereby to reduce the friction between the pad and piston, prevent torsional vibrations, and eliminate brake squeal.
Claim 2
Dependent Claim
110 words
A disc brake including a rotatable disc, a caliper straddling a portion of the periphery of said disc, a pad of friction material associated with said caliper and opposed to said disc, an axially movable piston in said caliper, and pressure fluid actuating means for moving said piston to force said pad into frictional engagement with said disc for braking action, in combination with an intermediate member molded in the form of a plate of sintered metal powder and impregnated with lubricating material positioned between the opposed surfaces of said pad and piston, whereby to reduce the friction between the pad and piston, prevent torsional vibrations, and eliminate brake squeal.
Claim 3
Dependent Claim
16 words
A disc brake according to claim 1, wherein said intermediate member is secured to said piston.
Claim 4
Dependent Claim
16 words
A disc brake according to claim 1, wherein said intermediate member is secured to said pad.
Claim 5
Dependent Claim
19 words
A disc brake according to claim 1, wherein said intermediate member is impregnated with grease as said lubricating material.
Claim 6
Dependent Claim
33 words
A disc bRake according to claim 1, wherein said pad has a backing plate and said intermediate member is a plate formed of sintered iron powder which is secured to said backing plate.
Claim 7
Dependent Claim
43 words
A disc brake according to claim 1, wherein a portion of said intermediate member is inserted in a concave portion provided in the piston, and another portion of the intermediate member is provided with a surface adapted during braking to contact said pad.
Claim 8
Dependent Claim
31 words
A disc brake according to claim 6, wherein a heat-resisting fiber impregnated with lubricating material is provided in the space between said intermediate member and said concave portion in the piston.
Claim 9
Dependent Claim
51 words
A disc brake according to claim 6, wherein said intermediate member is a plate formed in an annular shape having the same inner and outer diameters as the forward end of the piston and is rigidly fixed to the forward end of the piston, said intermediate member being impregnated with grease.
Claim 10
Dependent Claim
55 words
A disc brake according to claim 8, wherein the density of sintered material is lower in the middle part than in the peripheral part of said plate and asbestos impregnated with grease is filled into the interior space of the piston and contained between said plate, the cylindrical wall and the bottom of the piston.
Claim 11
Dependent Claim
76 words
A disc brake according to claim 1, wherein said piston is provided with a concave portion and an annular forward end portion opposed to said pad, said intermediate member having an annular stepped portion on its periphery which is secured to said annular end portion of the piston, and said intermediate member is provided with a tray surrounded by said annular stepped portion of the piston for retaining the lubricating material impregnated in the intermediate member.
Claim 12
Dependent Claim
28 words
A disc brake according to claim 10 wherein a heat-resisting fiber impregnated with a lubricant is provided to fill the space between said intermediate member and said tray.
Claim 13
Dependent Claim
36 words
A disc brake according to claim 10, wherein an oilproof soft rubber ring is further provided between an inner surface of the wall of said tray and a sidewall of a projection of said intermediate member.
Claim 14
Dependent Claim
44 words
A disc brake according to claim 12, wherein the depth of said tray is increased to form a space between the projection of said intermediate member and the inner bottom surface of the tray and said space is filled with asbestos fiber including grease.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-15 | 1976-02-14 | 1976-08-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-15 | 1980-02-14 | 1980-08-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-15 | 1984-02-14 | 1984-08-15 | $7700.00 | Window Closed / Lapsed |