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Improved design of integrated electro-hydraulic power unit

A hydraulic power unit, electrical technology, applied in mechanical equipment, machine/engine, liquid variable capacity machinery, etc., can solve problems such as limiting pump performance

Inactive Publication Date: 2007-03-07
SAUER DANFOSS NORDBERG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flow path across the motor is a small air gap between the rotor and stator which is restricted and severely limits the performance of the pump

Method used

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  • Improved design of integrated electro-hydraulic power unit
  • Improved design of integrated electro-hydraulic power unit
  • Improved design of integrated electro-hydraulic power unit

Examples

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Embodiment Construction

[0019] Referring to FIGS. 1 and 2 , the disclosed electrohydraulic power converter 10 has a rotary cam hydraulic power unit 12 . The unit 12 includes a housing 14 , an electrical machine or motor 16 and a pressurized hydraulic machine or pump 18 .

[0020] The electrical machine is preferably an alternating current (AC) induction motor, but may be any conventional electrical machine, including an alternating current (AC) machine; a direct current (DC) machine; an induction machine; a unidirectional machine; a three a multi-phase machine; a switched reluctance machine; a written pole machine; a permanent magnet alternating current (PMAC) machine; a permanent magnet direct current (PMDC) machine; a parallel excited machine; a a series excited machine; a compound excited machine; a synchronous machine; a separately excited machine; a brushless machine; a brushed machine; a brushless direct current machine; and a transversal flux machine.

[0021] Motor 16 is controlled and optio...

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PUM

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Abstract

An electro-hydraulic power unit with an improved hydraulic fluid flow through the unit. The unit accomplishes the improved fluid flow by having an inlet port in a housing that is fluidly connected to an electric motor that has a rotor with vanes cast thereon and at least one opening within the rotor. A hydraulic pump inlet is fluidly connected to the electric motor such that the vanes of the electric motor will supply hydraulic fluid to the hydraulic pump inlet.

Description

technical field [0001] The invention relates to an electro-hydraulic fluid power converter. More specifically, the invention relates to an apparatus comprising an electric machine coupled to a hydraulic machine. Background technique [0002] In material handling and other related fields, lift trucks are often used to transport heavy materials. Such trucks typically use a large lead-acid battery or similar device as a power source. Lift trucks also typically use hydraulic cylinder systems to perform lifting, lowering, tipping, extending, shifting, and other load handling functions. With conventional trucks, a battery-powered electric motor is typically used to turn a hydraulic pump. With this system, hydraulic pressure and flow are generated by a pump and regulated by a valve system fluidly connected to a series of hydraulic cylinders to move the payload. [0003] In the prior art, it is well known to use various DC motors. Recent developments in the field of solid-state...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04B23/10
CPCF04B17/03F04B1/14F04B1/128
Inventor D·B·拉夫纳迈克尔·D·冈德鲁德J·L·赫林
Owner SAUER DANFOSS NORDBERG
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