Patent US3825091A successfully refreshed from Google Patents.
US3825091A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydraulic fluid circuit for vehicle having articulated sections
Assignee: Caterpillar Inc
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Filing: 1971-05-24
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Granted: 1974-07-23
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Expires: 1991-05-24
Abstract
Abstract A hydraulic circuit having one or more pumps adjacent motor means in a machine with hydraulic motors which are supplied by the circuit being located in a relatively remote location from the pumps. A control valve is associated with each hydraulic motor and includes a return line in communication with a first hydraulic fluid tank. An assembly of one or more pumps for delivering fluid under pressure to the control valves is located adjacent the motor means and is driven by the motor means. A second hydraulic fluid tank is associated with the pump assembly, the second tank providing fluid to the pumps and being in communication with the first tank by a return conduit for delivering fluid from the first tank to the second tank. To prevent rupture of the first tank, a baffle is preferably arranged within that tank to assure a constant air pocket above the fluid.
Inventors
- 👤 T Geselbracht
- 👤 D Vinton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:38
CPC Classifications
F; F15; F15B; F15B1/00; F15B1/26; F15B1/265
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
211 words
A hydraulic circuit for a vehicle having an engine and a hydraulic motor remotely located from the engine of the vehicle, the vehicle having two sections joined in articulated relation, the engine being on one articulated section and the hydraulic motor being on the other articulated section, comprising at least one hydraulic pump associated in driven relation with the engine, a control valve associated with the hydralic motor, said control valve being in communication with a fluid outlet conduit of said pump, said control valve being selectively operable to deliver fluid under pressure for operating the hydraulic motor, a first hydraulic fluid tank associated with said control valve, said first tank being in communication with a fluid return from said valve, a second hydraulic fluid tank associated with said pump, said second tank being in communication with an inlet conduit to said pump, said pump and second tank being located on the one articulated section, said valve and first tank being located on the other articulated section, and a return conduit providing substantially free communication between said first and second tanks for delivering hydraulic fluid from said first tank to said second tank, said return conduit including a stand pipe in said first tank for establishing a normal fluid level therein.
Claim 2
Dependent Claim
211 words
A hydraulic circuit for a vehicle having an engine and a hydraulic motor remotely located from the engine of the vehicle, the vehicle having two sections joined in articulated relation, the engine being on one articulated section and the hydraulic motor being on the other articulated section, comprising at least one hydraulic pump associated in driven relation with the engine, a control valve associated with the hydralic motor, said control valve being in communication with a fluid outlet conduit of said pump, said control valve being selectively operable to deliver fluid under pressure for operating the hydraulic motor, a first hydraulic fluid tank associated with said control valve, said first tank being in communication with a fluid return from said valve, a second hydraulic fluid tank associated with said pump, said second tank being in communication with an inlet conduit to said pump, said pump and second tank being located on the one articulated section, said valve and first tank being located on the other articulated section, and a return conduit providing substantially free communication between said first and second tanks for delivering hydraulic fluid from said first tank to said second tank, said return conduit including a stand pipe in said first tank for establishing a normal fluid level therein.
Claim 3
Dependent Claim
194 words
A hydraulic circuit for a vehicle having motor means, at least one implement and a hydraulic motor for operating the implement being remotely located from the motor means, comprising a hydraulic pump associated with and coupled in driven relation to the motor means, a control valve hydraulically associated with the hydraulic motor, said control valve being in communication with said pump by a high pressure fluid conduit, a first hydraulic fluid tank associated with said control valve, said first tank being in communication with a fluid return line from said valve, a second hydraulic fluid tank associated with said pump, said second tank being in communication with an inlet conduit for delivering hydraulic fluid to said pump, a return conduit substantially freely communicating said two tanks for delivering fluid from said first tank to said second tank, said return conduit including a stand pipe in said first tank for establishing a normal fluid level therein, and wherein the vehicle is coMprised of two articulated sections, the motor means, said pump and second tank being located on one articulated section, the implement, said control valve and first tank being located on the other articulated section.
Claim 4
Dependent Claim
194 words
A hydraulic circuit for a vehicle having motor means, at least one implement and a hydraulic motor for operating the implement being remotely located from the motor means, comprising a hydraulic pump associated with and coupled in driven relation to the motor means, a control valve hydraulically associated with the hydraulic motor, said control valve being in communication with said pump by a high pressure fluid conduit, a first hydraulic fluid tank associated with said control valve, said first tank being in communication with a fluid return line from said valve, a second hydraulic fluid tank associated with said pump, said second tank being in communication with an inlet conduit for delivering hydraulic fluid to said pump, a return conduit substantially freely communicating said two tanks for delivering fluid from said first tank to said second tank, said return conduit including a stand pipe in said first tank for establishing a normal fluid level therein, and wherein the vehicle is coMprised of two articulated sections, the motor means, said pump and second tank being located on one articulated section, the implement, said control valve and first tank being located on the other articulated section.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-07-22 | 1978-01-21 | 1978-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-22 | 1982-01-21 | 1982-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-22 | 1986-01-21 | 1986-07-23 | $7700.00 | Window Closed / Lapsed |