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Compact electro-hydraulic unit
| Details |
Inventors: Vourc'h, Jean-Yves Ollivier;
Assignee: Hydroperfect International (Chenneviers Sur Marne, FR)
Primary Examiner: Thorpe; Timothy
Assistant Examiner: Korytnyk; Peter G.
Attorney, Agent or Firm: Kirschstein, et al.
A compact electro-hydraulic unit in which an electric motor drives an hydraulic pump having pinions and a pump body, with a cavity containing the pinions, the pump body comprising sound wave absorbing cavities surrounding at least partially the cavity containing the pinions. Some at least of the cavities communicate, by means of a side surface of the pump body, with a chamber of a cover leading to a fitting of a utilization circuit and with an outlet of the cavity containing the pinions, the cavities being supplied with a hydraulic fluid under high pressure. |
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DETAILED DESCRIPTION What I claim is: 1.
A compact electro-hydraulic unit, comprising: a) a drive motor; b) a hydraulic pump driven by the motor about an axis, said pump including i) a pump body having a periphery and a main cavity extending along the axis between opposite sides of the pump body, ii) an inlet in communication with the main cavity for admitting a low pressure fluid to the main cavity, iii) a set of pinions mounted in the main cavity for pressurizing the low pressure fluid to a high pressure fluid, iv) an outlet in communication with the main cavity for discharging the high pressure fluid from the main cavity during pressurizing, and v) a plurality of sound absorption cavities located within the pump body between the periphery and the axis, and at least partially surrounding the main cavity; c) a cover mounted on the pump and having an internal chamber in communication with at least one of the cavities and the outlet for receiving the high pressure fluid, said cover having a fitting for connection to a hydraulic receiver for conveying the high pressure fluid received in the internal chamber to the receiver; and d) a housing located within the pump body between the periphery and the axis, and containing an over-pressure cartridge in communication with the internal chamber of the cover.
2.
The electro-hydraulic unit as set forth in claim 1, wherein at least one of the sound absorption cavities is formed by two chambers separated by a cheek located between the cover and the pump body, said cheek being provided with channels.
3.
The electro-hydraulic unit as set forth in claim 1, wherein pressure pulses are generated by the pump; and further comprising calibrated apertures in communication with the outlet and at least one of the sound absorption cavities, for reducing said pressure pulses.
4.
The electro-hydraulic unit as set forth in claim 1, wherein the inlet extends into the pump body from a casing that forms a tank containing the pump and electric motor.
5.
The electro-hydraulic unit as set forth in claim 1, wherein the fitting has an O-ring gasket
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Generators or Motors 
