Cylinder block and swash plate type liquid-pressure rotating apparatus including same

Patent metadata

Field	Value
Publication number	US-10794185-B2
Application number	US-201716349021-A
Country	US
Kind code	B2
Filing date	Nov 9, 2017
Priority date	Nov 10, 2016
Publication date	Oct 6, 2020
Grant date	Oct 6, 2020

Abstract

A cylinder block includes: a plurality of cylinder bores including respective openings formed on a piston insertion end surface of the cylinder block, pistons being inserted in the respective cylinder bores and being configured to reciprocate and slide in the respective cylinder bores when the cylinder block rotates; and a cooling portion, wherein the cooling portion includes a plurality of cooling holes each formed between the adjacent cylinder bores and extending from the piston insertion end surface in an axial direction of the cylinder block.

First claim

The invention claimed is:

1. A cylinder block comprising:
a plurality of cylinder bores including respective openings formed on a piston insertion end surface of the cylinder block, a plurality of pistons being inserted in respective cylinder bores of the plurality of cylinder bores and being configured to reciprocate and slide in the respective cylinder bores of the plurality of cylinder bores when the cylinder block rotates; and
a cooling portion including a plurality of cooling holes formed between adjacent cylinder bores of the plurality of cylinder bores and extending from the piston insertion end surface in an axial direction of the cylinder block, the plurality of cooling holes not extending to a side surface of the cylinder block, and an axial depth of each cooling hole of the plurality of cooling holes is within a range of depth from the piston insertion end surface to a deepest portion of the plurality of cylinder bores.

2. A swash plate type liquid-pressure rotating apparatus comprising the cylinder block according to claim 1 ,
the swash plate type liquid-pressure rotating apparatus being connected to (i) a low-pressure passage configured to transfer a low-pressure operating liquid, and (ii) a high-pressure passage configured to transfer high-pressure operating oil, and
the swash plate type liquid-pressure rotating apparatus being configured to:
rotate the cylinder block by supplying the low-pressure operating liquid through the high-pressure passage to the plurality of cylinder bores, and discharge the operating liquid from the plurality of cylinder bores to the low-pressure passage, or
suction the low-pressure operating liquid through the low-pressure passage to the plurality of cylinder bores by rotating the cylinder block, compress the low-pressure operating liquid, and eject the low-pressure operating liquid to the high-pressure passage.

3. A cylinder block comprising:
a plurality of cylinder bores including respective openings formed on a piston insertion end surface of the cylinder block, a plurality of pistons being inserted in respective cylinder bores of the plurality of cylinder bores and being configured to reciprocate and slide in the respective cylinder bores when the cylinder block rotates; and
a cooling portion including a plurality of cooling holes formed between adjacent cylinder bores of the plurality of cylinder bores and extending from the piston insertion end surface in an axial direction of the cylinder block, an axial depth of each cooling hole of the plurality of cooling holes being within a range of a depth from the piston insertion end surface to a deepest portion of the plurality of cylinder bores into which the plurality of piston are inserted, each cooling hole of the plurality of cooling holes being inclined so as to penetrate the cylinder block from the piston insertion end surface toward an outer peripheral surface of the cylinder block.

4. A swash plate type liquid-pressure rotating apparatus comprising the cylinder block according to claim 3 ,
the swash plate type liquid-pressure rotating apparatus being connected to (i) a low-pressure passage configured to transfer a low-pressure operating liquid, and (ii) a high-pressure passage configured to transfer high-pressure operating oil, and
the swash plate type liquid-pressure rotating apparatus being configured to:
rotate the cylinder block by supplying the low-pressure operating liquid through the high-pressure passage to the plurality of cylinder bores, and discharge the operating liquid from the plurality of cylinder bores to the low-pressure passage, or
suction the low-pressure operating liquid through the low-pressure passage to the plurality of cylinder bores by rotating the cylinder block, compress the low-pressure operating liquid, and eject the low-pressure operating liquid to the high-pressure passage.

5. A cylinder block comprising:
a plurality of cylinder bores including a plurality of openings formed on a piston insertion end surface of the cylinder block, a plurality of pistons being inserted in respective cylinder bores of the plurality of cylinder bores and being configured to reciprocate and slide in the respective cylinder bores when the cylinder block rotates; and
a cooling portion including a plurality of cooling holes formed between adjacent cylinder bores of the plurality of cylinder bores and extending from the piston insertion end surface in an axial direction of the cylinder block, an axial depth of each cooling hole of the plurality of cooling holes being within a range of a depth from the piston insertion end surface to a deepest portion of the plurality of cylinder bores into which the plurality of piston are inserted, each cooling hole of the plurality of cooling holes including:
a linear portion extending in parallel with the respective adjacent cylinder bores of the plurality of cylinder bores, and
a drain hole portion extending from a position of the linear portion toward an outer peripheral surface of the cylinder block, the drain hole being open on the outer peripheral surface, the position of the linear portion being located away from the piston insertion end surface.

6. A swash plate type liquid-pressure rotating apparatus comprising the cylinder block according to claim 5 ,
the swash plate type liquid-pressure rotating apparatus being connected to (i) a low-pressure passage configured to transfer a low-pressure operating liquid, and (ii) a high-pressure passage configured to transfer high-pressure operating oil, and
the swash plate type liquid-pressure rotating apparatus being configured to:
rotate the cylinder block by supplying the low-pressure operating liquid through the high-pressure passage to the plurality of cylinder bores, and discharge the operating liquid from the plurality of cylinder bores to the low-pressure passage, or
suction the low-pressure operating liquid through the low-pressure passage to the plurality of cylinder bores by rotating the cylinder block, compress the low-pressure operating liquid, and eject the low-pressure operating liquid to the high-pressure passage.

7. A cylinder block comprising:
a plurality of cylinder bores including a plurality of openings formed on a piston insertion end surface of the cylinder block, a plurality of pistons being inserted in respective cylinder bores of the plurality of cylinder bores and being configured to reciprocate and slide in the respective cylinder bores when the cylinder block rotates; and
a cooling portion formed between adjacent bores of the plurality of cylinder bores, the cooling portion including a plurality of cooling holes extending in a radial direction from an outer peripheral surface of the cylinder block through a portion between the adjacent cylinder bores.

8. A swash plate type liquid-pressure rotating apparatus comprising the cylinder block according to claim 7 ,
the swash plate type liquid-pressure rotating apparatus being connected to (i) a low-pressure passage configured to transfer a low-pressure operating liquid, and (ii) a high-pressure passage configured to transfer high-pressure operating oil, and
the swash plate type liquid-pressure rotating apparatus being configured to:
rotate the cylinder block by supplying the low-pressure operating liquid through the high-pressure passage to the plurality of cylinder bores, and discharge the operating liquid from the plurality of cylinder bores to the low-pressure passage, or
suction the low-pressure operating liquid through the low-pressure passage to the plurality of cylinder bores by rotating the cylinder block, compress the low-pressure operating liquid, and eject the low-pressure operating liquid to the high-pressure passage.

9. A cylinder block c

Assignees

• Kawasaki Heavy Ind Ltd

Inventors

• Komada Koichi
• Kuroda Yuichiro
• Mitsuhata Akihito
• Sato Takaaki

Classifications

• F03C1/0652

  Cylinders · CPC title

• F03C1/0639 Primary

  having two or more sets of cylinders or pistons · CPC title

• F01B3/0002 Primary

  having stationary cylinders · CPC title

• F01B3/0052

  Cylinder barrel · CPC title

• F01B3/0076

  Connection between cylinder barrel and inclined swash plate · CPC title