Expansible chamber devices – Displacement control of plural cylinders arranged in... – Parallel cylinders
Patent
1997-04-14
1998-10-27
Denion, Thomas E.
Expansible chamber devices
Displacement control of plural cylinders arranged in...
Parallel cylinders
92 57, 92 71, 91506, 417269, 74 60, F01B 300, F04B 122
Patent
active
058264884
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to an apparatus for changing the angle of a swash plate for a piston pump/motor of swash plate type which is used as a motor for driving a construction machine or the like.
BACKGROUND ART
As the piston pump/motor of swash plate type, there has hitherto been known what is disclosed, for example, in Japanese Examined Patent Publication No. Hei 4-42550.
Specifically in such a piston pump/motor of swash plate type, as shown in FIG. 1 of the drawings attached hereto, a shaft 2 is rotatably supported in a casing 1 and has coupled thereto a cylinder block 3 that is so arranged as to be rotatable jointly with the said shaft 2 therein. The cylinder block 3 is formed in parallel to the said shaft 2 with a plurality of cylinder bores 4 which are spaced apart from one another in a circumferential direction thereof. Each of the cylinder bores 4 has a piston 5 slidably inserted fittedly therein, thereby forming a cylinder chamber 6 within the said cylinder bore 4. Also, the said shaft 2 has coupled thereto a thrust ball 16 in which is fitted a shoe 7 that is made oblique to the said shaft 2 by being arranged along a swash plate 8. The said thrust ball 16 and the said shoe 7 are so designed that they may be rotated jointly with the said shaft 2 and is also energized by a spring 17 towards the side of the said swash plate 8. In addition, each of the pistons 5 has its forward end that is coupled with the said shoe 7 universally. And, the assembly constituted of the foregoing components is so constructed that if a pressure fluid is supplied from and drained into, a fluid source (not shown) into and from, the pressure receiving chamber 6 of each of the said cylinder bores 4 to reciprocate the said pistons 5, the said swash plate 8 will act to rotate the said shaft 2 as well as the said cylindrical block 3 by guiding the shoes 7 and the said pistons 5 in the said circumferential direction. Conversely, if the said shaft 2 and the said cylinder block 3 are rotated, the said pistons 5 will each be reciprocated, thus serving as a pump. It is these components that constitutes the basic section of a piston pump/motor of swash plate type.
The above mentioned piston pump/motor of swash plate type has a capacity that is changed by a reciprocating displacement of the said piston 5 which is made when the said cylinder block 3 assumes one rotation, and the magnitude of the reciprocating displacement of the said piston 5 is determined by an angle that is made by a front surface 8a of the said swash plate 8 with respect to a center line 2a of the said shaft 2, that is, by a so called swash plate angle.
An apparatus for changing the above mentioned swash plate angle has hitherto had a construction, for example, as shown in FIG. 1, in which a rear surface 8b of the above mentioned swash plate 8 is formed with a first contact surface 9 and a second contact surface 10 which make a predetermined angle between them, a ball 12 is fitted between a boundary portion of the said first and second contact surfaces 9 and 10 and a swash plate support surface 11 of the said casing 1 to swingably support the said swash plate 8, the said swash plate 8 is swung clockwise by a force resultant from the thrust forces of such pistons 5 in the direction of the said swash plate 8 to push the said first contact surface 9 against the said swash plate support surface 11 with a resulting large angle of the said swash plate 8. The said swash plate 8 is also swung by a thrust force of a swash angle changing piston 13 that is attached to the said casing 1, against the force resultant from the thrust forces of the said pistons 5 in the direction of the swash plate to push the said second contact surface 10 against the said swash plate support surface 11 with a resulting small angle of the said swash plate.
More specifically, as shown in FIG. 2 of the drawings attached hereto, the resultant force Fa of the said piston thrust forces towards the said swash plate 8 will be applied to a point perpendicularly to the said front s
REFERENCES:
patent: 2915985 (1959-12-01), Budzich
patent: 4581980 (1986-04-01), Berthold
patent: 5649468 (1997-07-01), Tsurumi et al.
Arai Mitsuru
Hayashi Seita
Kado Hideki
Morita Koichi
Nunotani Sadao
Denion Thomas E.
Komatsu Ltd.
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