Pumps – Three or more cylinders arranged in parallel – radial – or... – Motor driven
Patent
1994-04-01
1997-01-07
Thorpe, Timothy
Pumps
Three or more cylinders arranged in parallel, radial, or...
Motor driven
4172221, 417356, F04B 122, F04B 3504
Patent
active
055910130
DESCRIPTION:
BRIEF SUMMARY
FIELD OF THE INVENTION
The present invention relates to a fluid pressure generating device. More specifically, the invention relates to a fluid pressure generating device having a motor and a liquid pump driven by the motor both contained within one casing.
BACKGROUND ART
In general, a fluid pressure generating device comprising a motor and a liquid pump driven by the motor is provided in the following construction. That is, the liquid pump (hereinafter, referred to as a pump) and the motor that drives the pump (hereinafter, referred to as a motor) are formed independently of each other. Then the output shaft of the motor is coupled with the input shaft of the pump via a coupling so that driving force of the motor is transmitted to the pump (Japanese Utility Model Laid-Open Publication No. 61-116192).
However, when the pump and the motor are formed independently of each other as shown above, there has been a problem that noise would occur at the shaft coupling portion because of misalignment between the output shaft and the input shaft. In addition, the operating noise of the pump and the motor result in a great noise as a whole. Also, since the pump and the motor are directly coupled with each other in the axial direction, the resulting axial length would become rather long so that the fluid pressure generating device as a whole would be a large size which would be a disadvantage.
Thus, as shown in Japanese Patent Publication for opposition No. 46-32900, a fluid pressure generating device was proposed which has a motor 102 and a pump 103 both contained within one casing 101, so that noise reduction and device downsizing can be implemented.
In this device, as shown in FIG. 12, a rotor 104 of the motor 102, which rotor is formed of laminated steel sheets, is rotatably supported to a main shaft 130 secured to the casing 101, via a pair of bearings 131, 132. The rotor 104 is provided with a plurality of holes 105, to which holes 105 and sleeves 106 are fitted, so that a plurality of cylinders 107 are formed. Further, pistons 108 are slidably provided in the cylinders 107. On the other hand, cylinder port plate 111 having a kidney-shaped ports 110 is disposed on one axial side of the rotor 104. One axial one end of each sleeve 106 is fitted to the cylinder port plate 111. A seal member 112 is provided between the fitting portion of the cylinder port plate 111 and the outer periphery of a sleeve 106. By this arrangement, the sleeves 106 and the rotor 104 have such a degree of freedom that they can move in both the axial and tilt-rotating direction relative to the cylinder port plate 111. Outside the cylinder port plate 111, a valve plate 116 with a suction port (not shown) and a discharge port 115 is disposed. This valve plate 116 is fixedly provided to the casing 101. The cylinder port plate 111 is put into sliding contact with the sliding surface of the fixed valve plate 116 so as to be rotatable relative to the sliding surface. Meanwhile, on the other axial side of the rotor 104, a swash plate 122 is provided which has an inclined surface on which shoes 121 retaining the head portions of the pistons 108 will slide. Further, a pressure plate 123 is provided so as to be fitted to the sleeves 106 on the other axial end side of the sleeves 106. One end face of this pressure plate 123 is in close contact with an end face of the rotor 104. A spherical retainer 125 for retaining the shoes 121 is fitted to a spherical portion 124 at the front end of the pressure plate 123.
The fluid pressure generating device constructed as described above is in such a coupling structure that the fitting portion between the cylinder port plate 111 and each sleeve 106 has a degree of freedom. Therefore, the cylinder port plate 111 and each sleeve 106 will be caused to move to each other in the axial direction by pressure variation within each cylinder 107. Also, the number of rotations of the motor 102 will vary due to load variation of the pump 103. In accompaniment to this variation, the cylinder port plate 111 and each sleeve
REFERENCES:
patent: 3295457 (1967-01-01), Oram
patent: 3672793 (1972-06-01), Yowell
patent: 4729717 (1988-03-01), Gupta
patent: 4850812 (1989-07-01), Voight
patent: 5220225 (1993-06-01), Moon, Jr.
Hiraki Masahito
Kawafune Kazunori
Suhara Masaaki
Daikin Industries Ltd.
Korytnyk Peter G.
Thorpe Timothy
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