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Ring cam and fluid-working machine including ring cam

A technology of fluid working machines and cams, which is applied in the direction of cams, machines/engines, liquid variable displacement machines, etc., and can solve problems such as wear of ring cams

Inactive Publication Date: 2012-10-24
ARTEMIS INTELLIGENT POWER
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Additionally, the inherent weight of the multiple rotating parts can cause excessive ring cam wear

Method used

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  • Ring cam and fluid-working machine including ring cam
  • Ring cam and fluid-working machine including ring cam
  • Ring cam and fluid-working machine including ring cam

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0138] Referring to Figure 1(b), a portion of an annular cam 1 is formed by cam segments 5 and 7 fastened by bolts 3 extending from openings 4 in the surface of the cam segment and securing the cam segments onto a cam support structure 2 . Additional cam segments (not shown) are fastenable while the cam support structure is still in place to complete the ring cam. The cam support structure is connected to a drive shaft 10 (which in normal use rotates in direction B) through which torque is received from an energy source (eg the blades of a wind or tidal generator).

[0139] Each cam segment has a piston facing surface 15, 16 which defines a part of the working surface of the ring cam. Thus, the annular cam has an active surface defined by cam segments fastened around the circumference of the drive shaft. The working surface is corrugated and includes a plurality of waves (defined relative to the direction of rotation) having a leading surface 70 and a following surface 72 . ...

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PUM

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Abstract

A ring cam (1 ) for a fluid-working machine is formed from a plurality of segments (5, 7). The segments have piston facing surfaces (15, 16) together defining a working surface of the fluid-working machine. The segments comprise a leading cooperating formation (46) which has a piston facing surface which forms part of the working surface, at a trailing end, and which is recessed from the working surface at a leading end, and a trailing cooperating formation (40) which has a piston facing surface which forms part of the working surface at a leading end, and which is recessed from the working surface at a trailing end. The cooperating formations interlock and rollers are thereby handed over smoothly from one segment to the next irrespective of slight variations in alignment due to manufacturing tolerance or wear. The segments having piston facing surfaces which are in compressive stress such as to partially or fully compensate for tensile stress arising from the action of rollers in use. The segments form a wavelike cam surface and attachment means (3) are provided, through the working surface, on whichever of the leading or trailing surfaces thereof is subject to lowest forces from pistons in use.

Description

technical field [0001] The present invention relates to a ring cam for a fluid working machine. Of particular relevance to the present invention are applications in which ring cams are subjected to particularly high forces in use, and in particular ring cams for large fluid working machines, for example in the nacelle of a wind turbine. Background technique [0002] Fluid-working machines include fluid-driven and / or fluid-driving machines, such as pumps, motors, and machines that can function as pumps or as motors in different operating modes. [0003] When the fluid working machine is operated as a pump, a low pressure manifold typically acts as a net source of working fluid and a high pressure manifold typically acts as a net sink of working fluid . When a fluid working machine is operated as a motor, a high pressure manifold typically acts as a net source of fluid and a low pressure manifold typically acts as a net sink of fluid. In this specification and the appended ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F03C1/04F04B1/04F04B9/04F01B1/06F16H53/02C11B1/12
CPCF03C1/0409F04B1/053F04B1/0413F04B17/02F01B1/0648F03C1/04F04C23/02F04B1/04F03C1/053C11B1/12F01B1/062F04B9/042F16H53/025Y10T29/49826Y10T74/2101F01B9/06F04B49/065F04B9/04F01B1/06
Inventor R·G·福克斯W·H·S·瑞普恩U·B·P·斯坦
Owner ARTEMIS INTELLIGENT POWER