Inclined axis hydraulic rotary machine

A rotary machine and hydraulic technology, applied in the direction of variable capacity engines, liquid fuel engines, liquid variable capacity machines, etc., can solve problems such as hot sticking and seizure, reduce wear, suppress heat generation, and improve reliability sexual effect

Active Publication Date: 2015-10-07
NIHON KENKI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, problems such as seizure and sticking may occur at the contact portion between the cylinder block and the piston.

Method used

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  • Inclined axis hydraulic rotary machine
  • Inclined axis hydraulic rotary machine
  • Inclined axis hydraulic rotary machine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0043] Hereinafter, a case in which the inclined-axis hydraulic rotary machine according to the embodiment of the present invention is applied to a fixed-capacity inclined-axis hydraulic motor will be described in detail with reference to the drawings.

[0044] Figure 1 to Figure 16 The first embodiment of the inclined axis type hydraulic rotary machine of the present invention is shown.

[0045] In the figure, 1 is a casing of a hydraulic motor which is a representative example of an inclined axis type hydraulic rotary machine. The housing 1 is composed of a cylindrical housing main body 2 bent in the middle in the longitudinal direction, and a head housing 3 described later.

[0046] The housing body 2 is composed of a one-side cylindrical portion 2A located on one side in the axial direction and another side cylindrical portion 2B on the other axial side, and the intermediate portion between the one-side cylindrical portion 2A and the other-side cylindrical portion 2B is ...

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Abstract

A surface treatment layer (15) is formed to cover a surface side of a cylinder block (6) including a center hole (7) and a plurality of cylinder holes (8) wholly. The surface treatment layer (15) is constituted by a nitriding layer (17) formed by executing nitride-based heat treatment to a base material (16) of the cylinder block (6) formed using an iron-based material such as cast iron or cast steel and a chemical conversion film (18) of manganese phosphate. The chemical conversion film (18) forms a chemical conversion film of manganese phosphate on a surface side of the nitriding layer (17). The chemical conversion film (18) is excellent in initial fitting properties to a sliding material such as a tapered piston (10). Therefore, wear in a contact section between each of cylinder holes (8) of the cylinder block (6) and the tapered piston (10) can be suppressed.

Description

technical field [0001] The present invention relates to an inclined-axis hydraulic rotary machine used as a hydraulic pump or a hydraulic motor in, for example, construction machines and other general machines. Background technique [0002] Generally, in the field of construction machinery or general machinery, fixed-capacity or variable-capacity inclined-axis hydraulic rotary machines are known as hydraulic pumps or hydraulic motors. [0003] This prior art oblique-axis hydraulic rotary machine includes: a housing; a rotating shaft rotatably provided in the housing; a hydraulic cylinder block separated in the circumferential direction and extending axially with a plurality of cylinder holes; And with the rotation of the hydraulic cylinder block, a plurality of pistons that reciprocate in each cylinder hole. [0004] On the other hand, the inclined axis type hydraulic rotary machine includes: a center hole formed along the center of the rotation axis of the hydraulic cylin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04B1/24F03C1/24F04B53/00F04B53/14F04B53/16
CPCF04B1/24F04B1/2021F04B27/0813F04B27/0826F04B53/162F05C2203/083F05C2253/12F05C2253/24
Inventor 沼口和弘新留隆志坪高弘奥野直之
Owner NIHON KENKI CO LTD
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