Patent US3645167A successfully refreshed from Google Patents.
US3645167A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control arrangement for hydraulic motors
Assignee: Robert Bosch GmbH
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Filing: 1969-12-19
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Granted: 1972-02-29
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Expires: 1989-12-19
Abstract
Abstract A hydraulic control arrangement for controlling the operation of a hydraulic motor equipped with a piston which may be subjected on both sides with fluid pressure. A control valve controls the flow of fluid under pressure from the motor to the return flow duct. A directional valve communicates with both sides of the piston of the motor and is actuated by the fluid flow. The control slide of the directional valve is urged, through spring action, into a neutral inoperative position, in which a fluid inflow duct to the directional valve is closed. The control slide connects two ports leading to hydraulically operated devices, with the inflow duct, when in operating positions. Flow chambers at both ends of the control slide communicate with the ports and the inflow duct through throttling passages.
Inventors
- 👤 Helmut Espenschied
- 👤 Joseph Sauer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:36
CPC Classifications
F; F15; F15B; F15B11/00; F15B11/08; F15B11/12; F15B11/121
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
159 words
A control arrangement for a neutral motor comprising, in combination, a hydraulic motor comprising a cylinder and a piston subjectable to pressure on both sides of said piston; return flow means from said motor; control valve means for controlling flow from said motor to said return flow means; directional valve means commUnicating with both sides of said piston for controlling fluid flow to said sides of said piston, said fluid flow actuating said piston; control slide means in said directional valve means and having a neutraul inoperative position and operating positions; fluid inflow means communicating with said directional valve means and closed when said control slide means is in said neutral inoperative position; two fluid flow ports connectable to said fluid inflow means through said control slide means in said operating positions of said control slide means; and chamber means on both end sides of said control slide means and communicating with said ports and said fluid inflow means.
Claim 2
Dependent Claim
159 words
A control arrangement for a neutral motor comprising, in combination, a hydraulic motor comprising a cylinder and a piston subjectable to pressure on both sides of said piston; return flow means from said motor; control valve means for controlling flow from said motor to said return flow means; directional valve means commUnicating with both sides of said piston for controlling fluid flow to said sides of said piston, said fluid flow actuating said piston; control slide means in said directional valve means and having a neutraul inoperative position and operating positions; fluid inflow means communicating with said directional valve means and closed when said control slide means is in said neutral inoperative position; two fluid flow ports connectable to said fluid inflow means through said control slide means in said operating positions of said control slide means; and chamber means on both end sides of said control slide means and communicating with said ports and said fluid inflow means.
Claim 3
Dependent Claim
20 words
The control arrangement as defined in claim 1 including throttling means between said chamber means and said fluid inflow means.
Claim 4
Dependent Claim
28 words
The control arrangement as defined in claim 1 including spring means acting on said control slide means and urging said control slide means into said neutral inoperative position.
Claim 5
Dependent Claim
74 words
The control arrangement as defined in claim 1, wherein SAID RETURN FLOW MEANS COMPRISES A plurality of controllable return flow ports communicating with said cylinder of said hydraulic motor and being spaced in axial direction of said cylinder from each other, and a return flow duct, said control valve means being arranged between said return flow ports and said return flow duct for connecting said return flow ports individually with said return flow duct.
Claim 6
Dependent Claim
18 words
The control arrangement as defined in claim 4 wherein said control valve means comprises an electromagnetically actuated valve.
Claim 7
Dependent Claim
47 words
The control arrangement as defined in claim 1 including flow line means connecting both sides of said piston of said motor; and said control valve means comprising auxiliary valve means in said flow line means for controlling fluid flow from said motor to said return flow means.
Claim 8
Dependent Claim
61 words
The control arrangement as defined in claim 6 wherein said auxiliary valve means has an initial position wherein said return flow means is closed and said flow line means is opened, said return flow means being opened and said flow line means being closed when said auxiliary valve means is in an operative position, said initial position being an inoperative position.
Claim 9
Dependent Claim
15 words
The control arrangement as defined in claim 7 including throttling means in said inflow means.
Claim 10
Dependent Claim
20 words
The control arrangement as defined in claim 8 wherein said throttling means throttles fluid flow in at least one direction.
Claim 11
Dependent Claim
22 words
The control arrangement as defined in claim 7 wherein said auxiliary valve means comprises electromagnetically actuated valve means with displaceable slide means.
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) | 1975-02-28 | 1975-08-30 | 1976-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-28 | 1979-08-30 | 1980-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-28 | 1983-08-30 | 1984-02-29 | $7700.00 | Window Closed / Lapsed |