US4360237A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Deceleration sensing type fluid pressure control device for vehicle brake system
Assignee: Akebono Brake Industry Co Ltd
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Filing: 1980-11-17
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Granted: 1982-11-23
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Expires: 2000-11-17
Abstract
Abstract A deceleration sensing type fluid pressure control device for vehicle brake system having a control piston; a proportioning action mechanism capable of varying the reducing value of output pressure from input pressure in relation to a load imposed on the control piston; an adjusting piston one end of which is connected to a fluid pressure source through a passage arrangement; and a valve mechanism which is disposed in the passage arrangement and closes when the deceleration of the vehicle reaches a predetermined value. The fluid pressure control device is provided with a swaying lever which has a middle point thereof serving as a fulcrum. One end of the lever engages the control piston. Between the other end of the lever and the other end of the adjusting piston, there is provided a control spring which imposes the above stated load on the control piston.
Inventors
- 👤 Toshifumi Maehara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:05
CPC Classifications
B; B60; B60T; B60T11/00; B60T11/10; B60T11/28; B60T11/34; B60T8/00; B60T8/26; B60T8/28; B60T8/282
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
328 words
A deceleration sensing type fluid pressure control device for a vehicle brake system, comprising in combination: a valve body having a first end and an oppositely disposed second end; a proportioning action mechanism located within said valve body and including an axially extending control piston with the axis thereof extending in the direction between the first and second ends of said valve body, said action mechanism arranged for varying the degree of reduction of output fluid pressure from input fluid pressure in relation to a load imposed on said control piston; an axially extending adjusting piston located within said valve body with the axis thereof extending in the direction between the first and second ends of said valve body and spaced laterally from the axis of said control piston; passage means interconnecting the input fluid pressure of said action mechanism with one end of said adjusting piston; a swaying lever located at the first end of said valve body and extending transversely of the axis of said control piston and adjusting piston, said lever having a first end and a second end and a stationary fulcrum spaced between said first and second ends thereof, said lever being in engagement with said control piston between said fulcrum and said first end of said lever; a valve mechanism located within said passage means, said valve mechanism controlling flow of the input fluid pressure to said adjusting piston for closing flow thereto when the deceleration of the vehicle reaches a predetermined value; and spring means in contact with said lever on the opposite side of said fulcrum from said control piston and including a control spring extending between said adjusting piston at a location spaced from the location where the input fluid pressure contacts said adjusting piston and said lever with said spring means contacting said lever between said fulcrum and the second end thereof, and said control spring arranged to impose said load on said control piston via said lever.
Claim 2
Dependent Claim
328 words
A deceleration sensing type fluid pressure control device for a vehicle brake system, comprising in combination: a valve body having a first end and an oppositely disposed second end; a proportioning action mechanism located within said valve body and including an axially extending control piston with the axis thereof extending in the direction between the first and second ends of said valve body, said action mechanism arranged for varying the degree of reduction of output fluid pressure from input fluid pressure in relation to a load imposed on said control piston; an axially extending adjusting piston located within said valve body with the axis thereof extending in the direction between the first and second ends of said valve body and spaced laterally from the axis of said control piston; passage means interconnecting the input fluid pressure of said action mechanism with one end of said adjusting piston; a swaying lever located at the first end of said valve body and extending transversely of the axis of said control piston and adjusting piston, said lever having a first end and a second end and a stationary fulcrum spaced between said first and second ends thereof, said lever being in engagement with said control piston between said fulcrum and said first end of said lever; a valve mechanism located within said passage means, said valve mechanism controlling flow of the input fluid pressure to said adjusting piston for closing flow thereto when the deceleration of the vehicle reaches a predetermined value; and spring means in contact with said lever on the opposite side of said fulcrum from said control piston and including a control spring extending between said adjusting piston at a location spaced from the location where the input fluid pressure contacts said adjusting piston and said lever with said spring means contacting said lever between said fulcrum and the second end thereof, and said control spring arranged to impose said load on said control piston via said lever.
Claim 3
Dependent Claim
33 words
A fluid pressure control device according to claim 1, wherein said spring means includes a hold spring which biases said adjusting piston in the direction toward the second end of said valve body.
Claim 4
Dependent Claim
47 words
A fluid pressure control device according to claim 1, wherein the distance between the point of contact of said control piston with said lever and said fulcrum is different from the distance between the point of contact of said spring means with said lever and said fulcrum.
Claim 5
Dependent Claim
51 words
A fluid pressure control device according to claim 1, wherein said spring means includes a spring case interposed between the second end of said lever and said control spring, and a hold spring extending between said spring case and said valve body for counteracting the biasing action of said control spring.
Claim 6
Dependent Claim
49 words
A fluid pressure control device according to claim 1, including stepped cylinders located within said valve body said control piston having a stepped shape and being slidably displaceable within said stepped cylinders, and a chamber encircling said control piston and arranged to be connected to the fluid pressure source.
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) | 1985-11-22 | 1986-05-24 | 1986-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-11-22 | 1990-05-24 | 1990-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-11-22 | 1994-05-24 | 1994-11-23 | $7700.00 | Window Closed / Lapsed |