Title:
DEVICE OF CONTROLLING HYDRAULIC PRESSURE DRIVING GEAR
Document Type and Number:
Japanese Patent JPS5464274
Kind Code:
A
Abstract:
1,218,020. 020. Hydraulic motor control circuits. R. BERINGER K. STERL K. GOGOL F. LEUTENEGGER and W. OLDAHI [trading as BERINGER-HYDRAULIK R. BERINGER & CO.] Dec. 12, 1967 [Dec. 13, 1966], No. 56339. Heading F1P. [Also in Divisions F2 and G3] A bank of spool valves 1, 2 have aligned inlet passages 5, a common drain channel 6a-6c and respective work ports 11, 12 and 21, 22. With both spools in the null positions shown, inlet fluid passes through passage 33 in plunger 31 to act on face 34 thereof to move the plunger to the right to unload the supply pump by connecting passages to drain. A datum pressure determined by spring 32 will then exist in the inlet passages, since the spring chamber 34a is connected to drain via passage 35 and grooves in the spools. When either spool is moved towards a work position, passage 35 is closed and that work port being connected to the inlet is air, connected to chamber 34a whereby the load pressure assists spring 32 and a constant pressure difference, equal to the said datum pressure, is maintained between inlet and load pressures. Over-riding pressure relief is provided by pilot valve 62. The spools may be actuated manually or by electromagnetically controlled pilot valves 91 at opposite ends thereof. Each pilot valve has a spool 75 which can connect line 76 supplying chamber 71 which either drain line 11a or supply line 5a. The pressure in line 76 has access through spool 75 to the right-hand face thereof to balance the electromagnetic attraction to provide proportional control.
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Inventors:
FUUBAATO HAUSURAA
Application Number:
JP9600474A
Publication Date:
May 23, 1979
Filing Date:
August 21, 1974
Export Citation:
Assignee:
IND & HANDELSMIJ
APPINGEDAMMER BRONSMOTOR
APPINGEDAMMER BRONSMOTOR
International Classes:
F15B11/05; B60K17/10; F15B11/16; F15B13/04; (IPC1-7): F15B11/05
Domestic Patent References:
| JP37010751A | ||||
| JPS4710751A | 1972-05-30 |