Patent US3752537A successfully refreshed from Google Patents.
US3752537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure modulator assembly
Assignee: Toyota Motor Corp
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Filing: 1970-11-09
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Granted: 1973-08-14
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Expires: 1990-11-09
Abstract
Abstract The assembly modulates the pressure of a working fluid, such as the brake fluid of an automotive vehicle, by the pressure of a control fluid, and includes an operating mechanism having a deflectable diaphragm, a working fluid pressure modulating mechanism operable by the diaphragm and including a pressure modulating piston controlling flow of working fluid through a working fluid line, and means biasing the diaphragm to a position in which the pressure modulating mechanism provides for substantially unrestricted flow to the working fluid line. A control fluid line is connected to the operating mechanism to apply, to the diaphragm, a control fluid pressure in opposition to the biasing means to operate the pressure modulating mechanism to restrict flow to the working fluid line. A throttle valve mechanism is included in the control fluid line to control the rate of control fluid relative to the operating mechanism, and the throttle valve mechanism is subjected to the pressure of the working fluid to vary the rate of flow of the control fluid as a function of the pressure of the working fluid. Application of the control fluid pressure is controlled by a valve operated by an anti-skid mechanism. The rate of flow of the control fluid may be varied as a direct function of the working fluid pressure, as an inverse function of the working fluid pressure, or as a combination of the direct and inverse functions of the working fluid pressure.
Inventors
- 👤 T Ochiai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:18
CPC Classifications
B; B60; B60T; B60T8/00; B60T8/32; B60T8/34; B60T8/50; B60T8/5018; B60T8/5087
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
194 words
A pressure modulator assembly, for modulating the pressure of a working fluid by the pressure of a control fluid, comprising, in combination, an operating mechanism including a casing and a deflectable diaphragm dividing said casing into two chambers; a working fluid pressure modulating mechanism operable by said diaphragm and including a pressure modulating piston controlling flow of working fluid through a working fluid line; means biasing said diaphragm to a position in which said pressure modulating mechanism provides for substantially unrestricted flow through the working fluid line; a control fluid line connected to said operating mechanism to apply, to said diaphragm, a control pressure in opposition to said biasing means to operate said pressure modulating mechanism to restrict flow through the working fluid line; a throttle valve mechanism in said control fluid line controlling the rate of flow of control fluid relative to said operating mechanism; and means connecting said working fluid line to said throttle valve mechanism and subjecting said throttle valve mechanism to the pressure of the working fluid to modulate continuously the rate of flow of the control fluid as a function of variation of the pressure of the working fluid.
Claim 2
Dependent Claim
194 words
A pressure modulator assembly, for modulating the pressure of a working fluid by the pressure of a control fluid, comprising, in combination, an operating mechanism including a casing and a deflectable diaphragm dividing said casing into two chambers; a working fluid pressure modulating mechanism operable by said diaphragm and including a pressure modulating piston controlling flow of working fluid through a working fluid line; means biasing said diaphragm to a position in which said pressure modulating mechanism provides for substantially unrestricted flow through the working fluid line; a control fluid line connected to said operating mechanism to apply, to said diaphragm, a control pressure in opposition to said biasing means to operate said pressure modulating mechanism to restrict flow through the working fluid line; a throttle valve mechanism in said control fluid line controlling the rate of flow of control fluid relative to said operating mechanism; and means connecting said working fluid line to said throttle valve mechanism and subjecting said throttle valve mechanism to the pressure of the working fluid to modulate continuously the rate of flow of the control fluid as a function of variation of the pressure of the working fluid.
Claim 3
Dependent Claim
87 words
A pressure modulator assembly, as claimed in claim 1, in which said throttle valve mechanism is positioned in said control fluid line exteriorly of said operating mechanism; said throttle valve mechanism including a throttle valve operated by the working fluid pressure in said pressure modulating mechanism and operable to change the flow area of said control fluid line to vary the working fluid pressure at a high rate, when the working fluid pressure is high, and at a low rate, when the working fluid pressure is low.
Claim 4
Dependent Claim
96 words
A pressure modulator assembly, as claimed in claim 2, in which said throttle valve comprises a cylinder and a piston reciprocable in said cylinder; said cylinder being formed with a pair of aligned ports included in said control fluid line; said piston being formed with an annular recess intermediate its ends and arranged to interconnect said ports; means engaging one end of said piston and biasing said piston to a position substantially interrupting communication between said ports; and means applying the working fluid pressure of said pressure modulating mechanism to the opposite end of said piston.
Claim 5
Dependent Claim
99 words
A pressure modulator assembly, as claimed in claim 2, in which said throttle valve comprises a cylinder formed with a pair of ports included in said control fluid line; a partition in said cylinder interposed between said ports and having a flow aperture therethrough; a piston reciprocable in said cylinder and having a tapered end extending into said aperture to control flow through said aperture; means biasing said piston to a position providing for substantially unrestricted flow through said aperture; and means apPlying the working fluid pressure of said pressure modulating mechanism to the opposite end of said piston.
Claim 6
Dependent Claim
245 words
A pressure modulator assembly, as claimed in claim 1, in which said throttle valve mechanism includes a case body directly mounted on said diaphragm; said control fluid line including a flexible conduit connected to and communicating with the interior of said case body; an operating piston reciprocable in said case body and including a first end extending into contact with said pressure modulating piston; said two chambers including a first chamber containing said biasing means and a second chamber on the opposite side of said diaphragm arranged to have the control fluid supplied thereto; means, including a part of said case body in said first chamber and the opposite end of said operating piston, forming a throttle valve included in said throttle valve mechanism; passage means in said piston and in said case body connecting said throttle valve to said second chamber; and second biasing means biasing said operating piston to a position providing for substantially unrestricted flow of control fluid through said throttle valve; said pressure modulating piston being subjected to the pressure of the working fluid in said pressure modulating mechanism to exert a pressure on said operating piston in opposition to said second biasing means; whereby the flow area of said throttle valve is decreased, to modulate the working fluid pressure at a low rate; when the working fluid pressure is high, and is increased, to modulate the working fluid pressure at a high rate, when the working fluid pressure is low.
Claim 7
Dependent Claim
44 words
A pressure modulator assembly, as claimed in claim 5, wherein said flow passage comprises a bore extending through said operating piston and communicating with a port in that portion of said case body located in said second chamber and opening into said second chamber.
Claim 8
Dependent Claim
204 words
A pressure modulator assembly, as claimed in claim 6, including a vacuum line communicating with said first chamber and selectively connectable to said control fluid line; a first check valve controlling flow through said bore in said operating piston, and opened only responsive to a vacuum in said control fluid line; a port opening through said operating piston independently of said bore in said operating piston; a second check valve controlling flow through said last-named port and opened only responsive to control fluid pressure in said control fluid line; and means, including said operating piston and said case body, defining a second throttle valve at the end of said operating piston opposite the end forming said first-mentioned throttle valve, said second throttle valve controlling communication between said second check valve and said second chamber and being opened responsive to movement of said operating piston, against the force of said second biasing means; by said pressure modulating piston; whereby, when the working fluid pressure is to decreased, such decrease is effected at a rate which increases with the working fluid pressure, and, when said working fluid pressure is to be increased, said increase is effected by a rate inversely proportional to the working fluid pressure.
References Cited (Backward Citations)
US3260556A
Cited
US3637057A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |