Patent US3746115A successfully refreshed from Google Patents.
US3746115A
Expired / Lapsed
US
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Hydraulic control apparatus for a hydraulic machine
Assignee: Robert Bosch GmbH
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Filing: 1972-01-07
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Granted: 1973-07-17
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Expires: 1992-01-07
Abstract
Abstract A control apparatus for an adjustable hydraulic machine includes a power amplifier for adjusting the hydraulic machine under the control of a control valve generally set by manual setting means. Limiting units are selectively and detachably attached to supporting means, and respond to excessive fluid pressure, flow, or torque, to influence a limiting valve which controls the flow to the control valve so that the power amplifier operates the adjusting means of the hydraulic machine to reduce the pumped amount of fluid so that normal operating conditions are automatically obtained. One or several limiting units can be attached and connected into the hydraulic circuit of the machine, and independently control the limiting valve.
Inventors
- 👤 P Bosch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:01
CPC Classifications
F; F16; F16H; F16H61/00; F16H61/38; F16H61/40; F16H61/46; F04; F04B; F04B49/00; F04B49/08
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
285 words
Hydraulic conTrol apparatus for a hydraulic machine having adjusting means for regulating the quantity of fluid transported by said hydraulic machine, comprising in combination, pressure responsive power amplifier means for operating said adjusting means, and having power chamber means, control valve means including a movable valve slide forming pressure chamber means communicating with said power chamber means; manually operated setting means connected with said valve slide for setting said valve slide to different control positions for actuating said power amplifier means to operate said adjusting means so that the hydraulic machine is adjusted in accordance with the selected position of said setting means; supporting means having a plurality of attaching portions; a plurality of limiting units for limiting different flow conditions, and communicating with said hydraulic machine, each limiting unit having a position of rest and an operative position, and moving to said operative position when an undesirable flow condition occurs, at least one of said limiting units being detachably and exchangably mounted in a selected one of said attaching positions; a transmitting device mounted on said supporting housing in the region of said attaching portions, and being moved to an actuated position by any limiting unit attached to any of said attaching portions and being in said operative position, whereby more than one limiting unit can be mounted on said attaching portions for moving said transmitting device, and a limiting valve including a limiting piston operated by said transmitting device in said actuated position to control the flow of fluid in said control valve means so that fluid from said control valve means actuates said power amplifier means to operate said adjusting means to reduce the quantity of fluid transported by said hydraulic machine.
Claim 2
Dependent Claim
285 words
Hydraulic conTrol apparatus for a hydraulic machine having adjusting means for regulating the quantity of fluid transported by said hydraulic machine, comprising in combination, pressure responsive power amplifier means for operating said adjusting means, and having power chamber means, control valve means including a movable valve slide forming pressure chamber means communicating with said power chamber means; manually operated setting means connected with said valve slide for setting said valve slide to different control positions for actuating said power amplifier means to operate said adjusting means so that the hydraulic machine is adjusted in accordance with the selected position of said setting means; supporting means having a plurality of attaching portions; a plurality of limiting units for limiting different flow conditions, and communicating with said hydraulic machine, each limiting unit having a position of rest and an operative position, and moving to said operative position when an undesirable flow condition occurs, at least one of said limiting units being detachably and exchangably mounted in a selected one of said attaching positions; a transmitting device mounted on said supporting housing in the region of said attaching portions, and being moved to an actuated position by any limiting unit attached to any of said attaching portions and being in said operative position, whereby more than one limiting unit can be mounted on said attaching portions for moving said transmitting device, and a limiting valve including a limiting piston operated by said transmitting device in said actuated position to control the flow of fluid in said control valve means so that fluid from said control valve means actuates said power amplifier means to operate said adjusting means to reduce the quantity of fluid transported by said hydraulic machine.
Claim 3
Dependent Claim
38 words
Control apparatus as claimed in claim 1, wherein one of said limiting units is a pressure limiting unit, a second limiting unit is a flow volume limiting unit, and a third limiting unit is a torque limiting unit.
Claim 4
Dependent Claim
38 words
Control apparatus as claimed in claim 1, wherein each of said attaching portions includes a threaded bore; and wherein each of said limiting units includes a body having an outer thread matching the thread of said threaded bores.
Claim 5
Dependent Claim
35 words
Control apparatus as claimed in claim 3, wherein at least one of said limiting units includes a bore, and a measuring piston in said bore movable between said position of rest and said operative position.
Claim 6
Dependent Claim
107 words
Control apparatus as claimed in claim 1, wherein a first limiting unit is a pressure limiting unit; wherein a second limiting unit is a flow volume limiting unit; wherein a third limiting unit is a torque limiting unit; wherein said three limiting units are mounted in three attaching portions, respectively,; wherein said transmitting means includes a first transmitting means engaged by said first and second limiting units and operated by the same to displace said limiting piston, and a second transmitting means engaged and operated by said third limiting unit, and operatively connected with said first transmitting means to operate the same to displace said limiting piston.
Claim 7
Dependent Claim
87 words
Control apparatus as claimed in claim 1, wherein a first limiting unit of said limiting units is a pressure limiting unit including a body forming a cylinder bore and mounted on a first attaching portion, a measuring piston forming in said cylinder bore, a pressure chamber communicating with said hydraulic machine, and a first spring biasing said measuring piston against the pressure of fluid in said pressure chamber; and wherein said measuring piston has a pin portion projecting out of said body for operating said transmitting device.
Claim 8
Dependent Claim
133 words
Control apparatus as claimed in claim 6, wherein a second limiting unit is a flow volume limiting unit including a second body mounted on a second attaching portion and forming a second cylinder bore, a second measuring piston mounted in said second cylinder bOre and forming two second pressure chambers in said second cylinder bore; a high pressure conduit connected with said hydraulic machine; a throttle in said conduit; wherein one of said second pressure chambers receives high pressure fluid from said conduit upstream of said throttle and the other second pressure chamber receives fluid from said conduit downstream of said throttle; and a second spring biasing said second measuring piston; and wherein said second measuring piston has a second pin portion projecting out of said second body for operating said transmitting device.
Claim 9
Dependent Claim
72 words
Control apparatus as claimed in claim 7, wherein each of said attaching portions of said supporting means includes a threaded bore; wherein said bodies of said first and second limiting units have outer threads threaded into said threaded bores; wherein said first and second springs having ends abutting the bottoms of said threaded bores so that the tension of said springs is adjusted by screwing said bodies into said threaded bores, respectively.
Claim 10
Dependent Claim
105 words
Control apparatus as claimed in claim 7, wherein said supporting means has an abutment surface; wherein said transmitting device includes a transmitting plate having on opposite ends on the bottom face fulcrum bulges resting on said abutment surface; wherein said pin portions abut said bottom face at said ends; wherein said limiting piston is spring biased toward said transmitting plate and engages the top surface thereof equidistant from said ends whereby when anyone of said pin portions displaces the respective end of said transmitting plate, the same is turned about the fulcrum bulge at the respective other end so that said limiting piston is operated.
Claim 11
Dependent Claim
79 words
Control apparatus as claimed in claim 9, wherein a third limiting unit is a torque limiting unit having a third body mounted on a third attaching portion of said supporting means and forming a third cylinder bore; a third measuring piston in said third cylinder bore forming a third pressure chamber in the same communicating with said hydraulic machine; wherein said third measuring piston has a third pin portion projecting out of said body for operating said transmitting device.
Claim 12
Dependent Claim
101 words
Control apparatus as claimed in claim 10, wherein said transmitting device further includes a double armed lever engaged by said third pin portion and having projections at the ends thereof, linkage means controlled by said power amplifier means for moving said lever perpendicularly to the direction of movement of said third pin portion, a lever arm mounted for angular movement about an axis, biasing means for biasing said lever arm to engage said projections, said lever arm having a free end resting on said projections, and means connecting said lever arm with said transmitting plate for operating said limiting valve means.
Claim 13
Dependent Claim
32 words
Control apparatus as claimed in claim 11, wherein said biasing means include a cylinder, a spring in said cylinder, and a piston biased by said spring and acting on said lever arm.
Claim 14
Dependent Claim
35 words
Control apparatus as claimed in claim 12, wherein said transmitting device includes means mounting said biasing means for movement along said lever arm for continuously varying the biasing force acting on said double armed lever.
Claim 15
Dependent Claim
40 words
Control apparatus as claimed in claim 13, wherein said lever arm includes a curved guide track for guiding said piston of said biasing means; and wherein said mounting means support said biasing means for angular movement along said guide track.
Claim 16
Dependent Claim
41 words
Control apparatus as claimed in claim 11, wherein said linkage means support said double armed lever for angular movement about an axis equidistant from said projections thereof so that said double armed lever can be displaced by said power amplifier means.
Claim 17
Dependent Claim
35 words
Control apparatus as claimed in claim 11, comprising a linkage operatively connecting said manually operated setting means with said biasing means for varying the point of engagement of said biasing means with said lever arm.
Claim 18
Dependent Claim
47 words
Control apparatus as claimed in claim 11, comprising a combustion motor for driving said hydraulic machine and having a gas pedal; and a linkage operatively connecting said gas pedal with said biasing means for varying the point of engagement of said biasing means with said lever arm.
Claim 19
Dependent Claim
26 words
Control apparatus as claimed in claim 11, including shaft means for mounting said lever arm for angular movement; and means for gradually slanting said shaft means.
Claim 20
Dependent Claim
72 words
Control apparatus as claimed in claim 11, comprising a vehicle having wheels and supporting said hydraulic machine; said hydraulic machine being a pump; a hydraulic motor driven by said pump and driving said wheels; a friction brake operable for braking said wheels and including a brake pedal; and linkage means connecting said brake pedal with said biasing means for varying the point of engagement of said biasing means with said lever arm.
Claim 21
Dependent Claim
73 words
Control apparatus as claimed in claim 1, wherein said setting means include first and second linkage means connected with said valve slide and with said power amplifier means, respectively, a manually operated member; and resilient connecting means connecting said first and second linkage means with said manually operated member so that said power amplifier means can adjust said adjusting means under the control of said limiting units without displacing said manually operated member.
Claim 22
Dependent Claim
29 words
Control apparatus as claimed in claim 20, wherein said valve means includes springs acting on the ends of said valve slide for urging the same to a central position.
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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |