Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Patent
1998-05-13
2000-09-19
Look, Edward K.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
295275, 295276, 29888, 2984802, F01B 300
Patent
active
061195804
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a swash plate type hydraulic rotational machine suitable for use on construction machines such as hydraulic excavator or the like to serve as a hydraulic pump or as a hydraulic motor, and a method for manufacturing a casing for a hydraulic rotational machine of this sort.
BACKGROUND OF THE INVENTION
Generally, as a hydraulic pressure source, hydraulic construction machines like hydraulic excavators are provided with a hydraulic pump, along with a rotational drive motor or a vehicle drive motor. For a hydraulic motor or hydraulic pump of this class, it has been known in the art to employ a swash plate type hydraulic rotational machine, for example, as disclosed in Japanese Patent Laid-Open No. H4-272482.
FIGS. 6 through 10 show examples of conventional swash plate type hydraulic rotational machine of the sort mentioned above, which are applied as a vehicle drive hydraulic motor.
More specifically, FIGS. 6 through 9 show a first example of the prior art. Indicated at 1 is a vehicle drive hydraulic motor which is constituted by a variable displacement swash plate type hydraulic rotational machine, for rotationally driving sprockets 35 through a speed reducer, which will be described hereinafter, which drive, for example, crawler belts (not shown) of a hydraulic excavator.
Designated at 2 is a casing of the hydraulic motor 1, the casing 2 being constituted by a main casing 3 and a rear casing 4 which closes an open axial end of the main casing 3 as shown in FIG. 7. The main casing 3 is formed in a cup-like shape which is open at one axial end and consists of a generally stepped cylindrical body portion 3A and a bottom portion 3B. Formed integrally with the outer periphery of the cylindrical body portion 3A is an annular flange 3C which is securely fixed to a truck frame (not shown) of the aforementioned hydraulic excavator by way of a number of screw holes 3D. Further, formed on the inner peripheral side of the stepped cylindrical body portion 3A is a double-step wall portion 3E which has its diameter increased in two steps toward the open end of the casing for mounting a brake device thereon.
Indicated at 5 is a drive shaft which is rotatably supported in the casing 2 as a rotational shaft, and at 6 is a rotor which is rotatably provided in the casing 2. This rotor 6 is splined on the outer periphery of the drive shaft 5 and located within the stepped body portion 3A of the main casing 3. Formed in the rotor 6 are a plural number of cylinders 7 which are extended in the axial direction at angularly spaced positions around the drive shaft 5. As will be described hereinafter, a piston 10 is reciprocably fitted in each one of the cylinders 7.
Denoted at 8 is a valve plate which is located between the rear casing 4 and the rotor 6 and securely fixed to the rear casing 4. This valve plate 8 is provided with a pair of supply and discharge ports 8A (only one of which is shown in the drawings) which are intermittently communicated with the respective cylinders 7 of the rotor 6. In turn, the supply and discharge ports 8A are communicated with a pair of supply and discharge passages 9 (only one of which is shown in the drawings) which are respectively formed in the rear casing 4.
Indicated at 10 are a plural number of pistons having one end portions thereof slidably fitted in the cylinders 7 of the rotor 6 and the other end portions projected out of the respective cylinders 7. The reference numeral 11 denotes a plural number of shoes which are swivelably mounted on the respective projected ends of the pistons 10. These shoes 11 are held in sliding contact with a swash plate 12, which will be described below, to guarantee smooth rotation of the rotor 6 relative to the swash plate 12.
Indicated at 12 is the swash plate which is tiltably mounted on the side of the bottom portion 3B of the main casing 3. The swash plate 12 is provided with an inclined surface 12A which is inclined relative to the center axis of the drive shaft 5 and held in sliding contact with the respe
Kagiwada Hitoshi
Kimura Ken-ichi
Sato Hitoshi
Hitachi Construction Machinery Co. Ltd.
Look Edward K.
Rodriguez Hermes
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