Abstract:
PROBLEM TO BE SOLVED: To provide a displacement detecting device for a variable displacement type compressor accurately, which detects a swash plate angle. SOLUTION: In the variable displacement compressor, a piston 28 provided in a housing 11 is connected to a swash plate 22 via a shoe 29; a sliding part slidingly contacting the shoe 29 of the swash plate 22 is rotatably provided synchronizing with the rotation of a drive shaft 17; and the inclination angle of the swash plate 22 that performs an oscillating movement in the axial direction of the drive shaft 17 while synchronizingly rotating with the drive shaft 17 accompanying the rotation of the drive shaft 17 is controlled to change the stroke of the piston 28. The variable displacement compressor is provided with a magnet 35 as a detection object on the outer peripheral part R of the swash plate 22, and a magnetic sensor 36 as a detector is provided in the housing 11 to oppose the magnet 35. The magnet 35 passes an intersection of a line connecting a top dead center position P and a bottom dead center position Q of the swash plate 22, and an axial line m of the drive shaft 17, and is provided on an outer peripheral part R of the swash plate 22 where a face perpendicular to the line connecting the top dead center position P and the bottom dead center position Q of the swash plate 22 crosses. COPYRIGHT: (C)2007,JPO&INPIT
Abstract:
The invention relates to a hydraulic assembly comprising a variable electric motor and a hydrostatic variable displacement pump which can be coupled thereto and the pivoting angle of which can be adjusted by means of a hydromechanical adjustment device, the pivoting angle being detectible by means of a pivoting angle sensor and a working pressure of the variable displacement pump being detectible by means of a pressure sensor. A speed of the electric motor can be varied depending on the pivoting angle sensor and the pressure sensor.
Abstract:
Die Erfindung betrifft eine Hydromotoreinheit mit einem mit zwei Arbeitsleitungen (3, 4) verbundenen Hydromotor (1'). Der Schwenkwinkel (α) des Hydromotors (1') ist durch eine Verstelleinrichtung (7) verstellbar. Die Verstelleinrichtung (7) weist einen Stellkolben (8) mit zwei Kolbenflächen (9, 10) auf, wobei der auf eine erste Kolbenfläche (10) in einem Stelldruckraum (12) wirkende Stelldruck durch ein Stelldruckregelventil (13) einstellbar ist. Das Stelldruckregelventil (13) ist zwischen zwei Endpositionen verstellbar, wobei an einer ersten Messfläche (23) des Stelldruckregelventils (13) der Druck einer Arbeitsleitung (3, 4) angreift und eine zweite, entgegengesetzte Messfläche (25) des Stelldruckregelventils (13) durch einen Steuerdruckkolben (34) erst bei Überschreiten eines Grenzwerts eines Steuerdrucks in einer Steuerdruckzuleitung (28, 28') durch einen Steuerdruckkolben (34) mit einer von dem Steuerdruck abhängigen Kraft beaufschlagt ist.
Abstract:
A fuel injection control device (an electronic governor (12) and a controller (13)) for an engine (1) is capable of controlling the governor region to an isochronus characteristic. A working machine controller (18) receives a delivery pressure signal (P) and controls a regulator (16) in such a manner that when the delivery pressure of a hydraulic pump exceeds a predetermined pressure (P1), the displacement volume of the hydraulic pump does not exceed a value determined by a preset pump absorption torque curve (20) and when the delivery pressure of the hydraulic pump (2) is not more than a predetermined pressure (P1), the displacement volume of the hydraulic pump increases as the delivery pressure of the hydraulic pump lowers from the predetermined pressure (p1). This makes it possible, even if the governor region is controlled to an isochronus characteristic, to increase the delivery rate of the hydraulic pump as the engine load becomes lighter.
Abstract:
When a mode signal Sm of a mode switch (13) is ON, an arithmetic unit (12a) of a controller (12) executes learning control in which a driving current (I) corresponding to a predetermined target pump rotation theta 0 is supplied to a proportional solenoid valve (3) to determine the difference between the target pump rotation theta 0 and actual pump rotation theta and the difference is stored as a corrective value DELTA theta 0 in an EEPROM of a memory unit (12b). When the mode signal Sm of the mode switch (13) is OFF, the arithmetic unit executes normal control in which the corrective value DELTA theta 0 stored in the memory unit (12b) is added to the target pump rotation theta 0 and a driving current (I) corresponding to this corrected target pump rotation theta 0 is supplied to the proportional solenoid valve (3). Therefore, even when any variance exists in the input/output characteristics of a regulator as displacement control means (control objet) of a hydraulic pump and the proportional solenoid valve, variance of actual pump rotation as the output of the control object can be reduced.
Abstract:
The invention is directed to a swashplate angle sensor (10) for a variable displacement hydraulic unit (1). The hydraulic unit (1) comprising a housing (2), within which a swashplate (3) with a rod shaped feedback-link (12) fixedly attached to the swashplate (3) is arranged pivotable around a swashplate axis (7). The angle sensor (10) comprising a magnet (16) mounted rotatable on a magnet carrier (13), and a sensor (15) for sensing the orientation of the magnet (16). The magnet carrier (13) is located in a control block (14) attached to the housing (2) and is located parallel to the feedback-link (12). The magnet carrier (13) is rotatable around a sensor axis (18) being parallel to the swashplate axis (7). A linkage spring (11) provides a connection between the feedback-link (12) and the magnet carrier (13) such that a pivoting of the swashplate (3) with the feedback-link (12) causes a rotation of the magnet carrier (13).
Abstract:
The invention relates to a hydraulic assembly comprising a variable electric motor and a hydrostatic variable displacement pump which can be coupled thereto and the pivoting angle of which can be adjusted by means of a hydromechanical adjustment device, the pivoting angle being detectible by means of a pivoting angle sensor and a working pressure of the variable displacement pump being detectible by means of a pressure sensor. A speed of the electric motor can be varied depending on the pivoting angle sensor and the pressure sensor.