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US3679327A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulically regulated drive
Assignee: Brueninghaus Hydraulik GmbH
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Filing: 1970-03-03
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Granted: 1972-07-25
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Expires: 1990-03-03
Abstract
Abstract A hydraulic transmission drive comprising a combustion engine, a main pump, and a hydraulic motor, is regulated by adjusting the output of the main pump by regulating means including a hydraulic motor and a regulating pump driven by the combustion engine and driving the regulating motor. An adjustable throttle means is connected with the outlet conduit of the regulating pump and influences the operation of the regulating motor so that when the main pump has an overload, its speed is reduced together with the speed of the combustion engine until the torque of the combustion engine is sufficient.
Inventors
- 👤 Josepf Riedhammer
- 👤 Fritz-Jorg Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 10:22
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F15; F15B; F15B11/00; F15B11/08; F15B11/10; F16H61/465; F15B2211/00; F15B2211/20; F15B2211/205; F15B2211/20507; F15B2211/20523; F15B2211/2053; F15B2211/20546; F15B2211/20553; F15B2211/20561; F15B2211/60; F15B2211/635
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
294 words
Hydraulically regulated drive for a hydraulic motor, comprising a combustion engine; a variable load main hydraulic motor; a main pump driven by said engine to supply pressure fluid to said main hydraulic motor and continuously driving the same so that the turning moment required by said main pump and thereby the speed of said combustion engine vary with variations of the load on said hydraulic main motor, said main pump including regulating means for varying the pumped volume; a regulating pump also driven by said combustion engine and having an outlet conduit; hydraulic regulating motor means connected with said outlet conduit and including control means operated by fluid pumped by said regulating pump, and spring means biasing said control means to a neutral position, said control means being connected with said regulating means of said main pump for adjusting the pumped volume of the latter; and relief throttle means connecting said outlet conduit with a low pressure region, and having a throttle opening substantially adjusted so that at the highest number of revolutions of said combustion engine, said control means of said hydraulic regulating motor means adjusts said regulating means of said main pump to set said main pump to the highest displacement volume, said throttle means reducing in the event of an overload on said main motor and main pump, the fluid pressure in said outlet conduit and in said regulating motor means so that said spring means move said control means toward said neutral position for adjusting said regulating means to adjust said main pump toward a neutral position so that the drive torque required by said main pump is reduced until it corresponds to the torque produced by said combustion engine at the reduced number of revolutions caused by the overload.
Claim 2
Dependent Claim
294 words
Hydraulically regulated drive for a hydraulic motor, comprising a combustion engine; a variable load main hydraulic motor; a main pump driven by said engine to supply pressure fluid to said main hydraulic motor and continuously driving the same so that the turning moment required by said main pump and thereby the speed of said combustion engine vary with variations of the load on said hydraulic main motor, said main pump including regulating means for varying the pumped volume; a regulating pump also driven by said combustion engine and having an outlet conduit; hydraulic regulating motor means connected with said outlet conduit and including control means operated by fluid pumped by said regulating pump, and spring means biasing said control means to a neutral position, said control means being connected with said regulating means of said main pump for adjusting the pumped volume of the latter; and relief throttle means connecting said outlet conduit with a low pressure region, and having a throttle opening substantially adjusted so that at the highest number of revolutions of said combustion engine, said control means of said hydraulic regulating motor means adjusts said regulating means of said main pump to set said main pump to the highest displacement volume, said throttle means reducing in the event of an overload on said main motor and main pump, the fluid pressure in said outlet conduit and in said regulating motor means so that said spring means move said control means toward said neutral position for adjusting said regulating means to adjust said main pump toward a neutral position so that the drive torque required by said main pump is reduced until it corresponds to the torque produced by said combustion engine at the reduced number of revolutions caused by the overload.
Claim 3
Dependent Claim
48 words
Hydraulically regulated drive as claimed in claim 1 wherein said throttle means has an inlet connected with said outlet conduit, and an outlet for discharging a pArt of the fluid flowing in the same for influencing the pressure of the fluid flowing to said hydraulic regulating motor means.
Claim 4
Dependent Claim
42 words
Hydraulically regulated drive as claimed in claim 1 wherein said hydraulic regulating motor means includes a hydraulic regulating motor having said movable control means, and a valve means in said outlet conduit for reversing the direction of movement of said control means.
Claim 5
Dependent Claim
74 words
Hydraulically regulated drive as claimed in claim 1 wherein said throttle means includes a housing having a throttle conduit with an inlet connected with said outlet conduit and an outlet, a throttle wall across said throttle conduit located between said inlet and outlet of the same and having a throttle opening registering with said throttle conduit, and a needle valve mounted in said housing and having an end portion located in said throttle opening.
Claim 6
Dependent Claim
35 words
Hydraulically regulated drive as claimed in claim 4 wherein said housing has another outlet for directly connecting said outlet conduit of said regulating pump upstream of said throttle opening with said hydraulic regulating motor means.
Claim 7
Dependent Claim
61 words
Hydraulically regulated drive as claimed in claim 4 wherein said throttle wall has a substantially frusto-conical recess tapering in the direction of the flow of fluid in said throttle conduit and forming at the narrow end thereof said throttle opening; and wherein said needle valve is located on the side of said throttle wall and throttle opening remote from said recess.
Claim 8
Dependent Claim
66 words
Hydraulically regulated drive as claimed in claim 4 wherein said housing includes means mounting said needle valve for movement in longitudinal direction thereof into and out of said throttle opening; and means for adjusting the position of said needle valve for varying the size of said throttle opening whereby the amount of fluid flowing from said regulating pump to said hydraulic regulating motor means is adjusted.
Claim 9
Dependent Claim
118 words
Hydraulically regulated drive as claimed in claim 4 wherein said throttle means comprises an auxiliary throttle in said outlet located downstream of said throttle opening, a cylinder chamber in said housing communicating with a portion of said throttle conduit adjacent said auxiliary throttle for receiving pressure fluid, a piston element secured to said needle valve and located in said cylinder chamber, and means biassing said needle valve and piston element into said cylinder chamber so that said needle valve moves into said throttle opening when the pressure of the fluid adjacent said auxiliary throttle and in said cylinder chamber exceeds the force of said biassing means whereby the flow cross section of said throttle opening is automatically adjusted.
Claim 10
Dependent Claim
61 words
Hydraulically regulated drive as claimed in claim 8 wherein said needle valve has a pointed front end projecting into said throttle opening, and a thick rear end portion forming said piston element; and wherein said biassing means is a spring abutting said thick rear end portion and a portion of said housing for urging said needle valve into said cylinder chamber.
Claim 11
Dependent Claim
36 words
Hydraulically regulated drive as claimed in claim 8 wherein said housing has an other outlet for directly connecting said outlet conduit of said regulating pump upstream of said throttle opening with said hydraulic regulating motor means.
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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) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |