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Axial-piston machine having an antiwear layer

a technology of anti-wear layer and axial piston, which is applied in the direction of machines/engines, mechanical devices, and positive displacement liquid engines, etc., can solve the problems of uneven loading, increased wear of plastic layers, and faster wear, so as to reduce wear and increase wear resistance , the effect of easy production

Inactive Publication Date: 2010-01-07
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides an axial piston machine that can be made more easily and can operate with a variety of flow media. It is also more resistant to wear and damage, especially under heavy loading. The machine has a layer of diamond-like, amorphous carbon (ta-C) which is applied to the sliding sides of the machine parts to increase their resistance to fatigue, wear, and corrosion. This layer can be applied more easily and cost-effectively, and it improves the performance of the machine even in the presence of contaminated flow media.

Problems solved by technology

A disadvantage of the aforementioned axial piston machine is that in the presence of oil-containing flow media, the plastic layer may react to the flow medium in a disadvantageous manner, which subjects the plastic layer to increased wear.
In particular in rapid load changes and at high operating pressures, vapor bubbles can form, and subsequent pressure pulses, so-called cavitation, may occur in the hydraulic medium, as well as the already mentioned rebounding of the cylinder drum or the pressure plate; the plastic layer has only insufficient resistance to such stresses and thus wears quickly, the plastic layer detaching only regionally, which results in uneven loading and faster wear.
Both the plastic layer and the bronze layer increase the production time and expense and are disadvantageous as a result.

Method used

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  • Axial-piston machine having an antiwear layer
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Embodiment Construction

[0020]The axial piston machine illustrated in FIG. 1 is configured as swash plate with an adjustable displacement volume and one flow direction; in the conventional manner it includes a hollow-cylindrical housing 1 having an end that is open at the end face (upper end in FIG. 1); a connection plate 2, which is secured to housing 1 and seals its open end; a cam plate or swash plate 3; a control plate 4, which is also known as control body or control mirror; a drive shaft 5 and a cylinder drum 6.

[0021]Swash plate 3 is designed as so-called tilting cradle having a semi-cylindrical cross section and, via two bearing surfaces that extend with mutual clearance parallel to the tilting direction, is supported with hydrostatic destressing at two correspondingly formed bearing shells 8, which are mounted on the inner surface of housing end face 9 situated opposite connection plate 2. The hydrostatic destressing is implemented in a conventional manner via pressure pockets 10 formed in bearing ...

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Abstract

An axial piston machine having a control plate and a cylinder drum rotating relative to the control plate. The control plate rubs or slides on a second sliding side of the cylinder drum via a first sliding side. One of the sliding sides has a carbon-containing layer.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a hydrostatic machine configured as axial-piston machine.BACKGROUND INFORMATION[0002]An axial-piston machine having a control plate and a cylinder drum sliding on the control plate is described in German Patent Application Serial No. DE 102 23 844 A1, for instance. Situated on one side of the paired surfaces rubbing against each other is a plastic layer, and on the other side is a carbon-containing layer.[0003]Due to the two-axle loading in the axial and radial direction, and because of cavitation, the regions of the surfaces of the control plate and the cylinder drum facing each other are subjected to increased loading. This includes the normally present notches to avoid rapid pressure fluctuations at the control openings of the control plate. In particular, the surfaces facing each other are also stressed by rebounding of the cylinder drum or the pressure plate on to the control plate.[0004]A disadvantage of the aforemen...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F01B13/04F04B1/20
CPCF04B1/2021F05C2253/12F05C2203/0808
Inventor BECK, THOMASSCHATTKE, ALEXANDERHENKE, SASHAEMRICH, BERNDJACOBS, GEORGKUTRZ, HERBERT
Owner ROBERT BOSCH GMBH