US 5,591,013 AGranted

Fluid pressure generating device

AssigneeDaikin Industries, Ltd.

InventorsKazunori Kawafune, Masaaki Suhara, Masahito Hiraki

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Abstract

A fluid pressure generating device is provided which is capable of reducing noise and vibration and improving durability and yet which is simple in construction and successful in assemblability. A cylinder block having a main shaft substantially at a center thereof and a plurality of cylinders on an outer peripheral portion, each of the cylinders having a piston slidably provided therein, is formed separately of a rotor. The rotor has a fitting hole positioned substantially at a center thereof, to which fitting hole the cylinder block is fitted and secured. The rotor is rotatably supported by a stationary member via the cylinder block and the main shaft. A piston actuator having an inclined surface on which shoes slidably retained by head portions of the pistons, is provided on one axial side of the cylinder block while a valve plate is provided on the other side of the cylinder block.

Claims27

Dependent claims

A fluid pressure generating device comprising:

a casing;
a motor positioned in the casing and provided with a rotor having a fitting hole positioned substantially at a center thereof;
a cylinder block having a main shaft at substantially a center thereof and a plurality of cylinders on an outer peripheral portion, wherein pistons are slidably mounted in said cylinders, each piston having a head portion on one side of the cylinders, and the cylinder block further having ports with a sectional area smaller than the sectional area of the cylinders on the other side of the cylinders opposite to the pistons;
a piston actuator arranged opposite to the head portions and having an inclined surface on which the head portions slide;
and
a valve plate arranged opposite to one end of the cylinder block opposite to the piston side and having a suction port and a discharge port communicating with a suction passage and a discharge passage, respectively;
wherein the cylinder block is fixedly fitted to the fitting hole of the rotor and the main shaft is supported by the casing, so that the rotor is rotatably supported by the casing via the cylinder block and the main shaft.

4 more elements

A fluid pressure generating device comprising:

a casing;
a motor positioned in the casing and provided with a rotor having a fitting hole positioned substantially at a center thereof;
a cylinder block having a main shaft substantially at a center thereof and a plurality of cylinders on an outer peripheral portion, wherein pistons are slidably mounted in said cylinders, each piston having a head portion on one side of the cylinders, and the cylinder block further having ports with a sectional area smaller than the sectional area of the cylinders on the other side of the cylinders opposite to the pistons;
a piston actuator arranged opposite to the head portions and having an inclined surface on which a shoe retained by the head portions will slide;
and
a valve plate arranged opposite to one end of the cylinder block opposite to the piston side and having a suction port and a discharge port communicating with a suction passage and a discharge passage, respectively;
wherein the cylinder block is fixedly fitted to the fitting hole of the rotor and the main shaft is supported by the casing, so that the rotor is rotatably supported by the casing via the cylinder block and the main shaft.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 08/211,315Filed 1 Apr 1994
Priority: JP 4-2103136 Aug 1992
Granted: 7 Jan 1997
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

F04B 23/106
At least one pump being of the reciprocating positive-displacement type: being an axial piston pump
F04B 1/20
Having cylinder axes coaxial with, or parallel or inclined to, main shaft axis: having rotary cylinder block
F04B 1/2007
Having rotary cylinder block: arrangements for pressing the cylinder barrel against the valve plate, e.g. by fluid pressure
F04B 1/2071
Housings: bearings for cylinder barrels