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How hydraulic motor works?

  1. Oct 31, 2010 #1
    Hey Respected seniors,
    I wanna know that how the hydraulic motor works?
    Im working as a trainee engineer in a company..
    I watch daily a machine that have hydraulic motor, pump, solenoid valve...
    All these things are for the movement of a shaft which is connected to a jack( I see, there are two cables/nozzles for pump pressures attached with that jack..). ..

    PLZ simply tell me how the hydraulic motor, pump, solenoid valve work together?

    thanx & best regards
  2. jcsd
  3. Oct 31, 2010 #2
    Hydraulic motors are basically water wheels. A fluid under pressure pushes against vanes attached to a shaft and makes the shaft turn. After doing a little pushing the fluid is drained from the motor and returned to the pump that pressurized it. The pump itself is just a reversed version of the motor -- something turns a shaft that has vanes which pushes fluid out of a port under pressure.

    There should be some good diagrams of these things on wiki or google someplace if you poke around a bit.

    Beating the analogy a little further, this is pretty much how an electric motor or generator works as well...see the Hydraulic Analogy.
  4. Nov 2, 2010 #3
    thanx alot....
  5. Nov 2, 2010 #4
    Actually the machine that I discussed is a SPREADER which is used with CRANES(ship to shore,sts, and rubber tyre gentry,RTG)..
    So If any body is working at PORT then I request him, plz tell me in detail,thanx
    Last edited: Nov 2, 2010
  6. Nov 3, 2010 #5


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    Gold Member

    The specific application is pretty much irrelevant, except perhaps as regards scale. The pump (vane or lobe type), under the influence of a drive motor, supplies pressurized oil to the motor (which is just a pump fed from the other end). The valve, whether electrical or mechanical, controls the flow of oil into the motor. I don't quite understand the particular matching of a motor with a cylinder (which you called a jack) in this instance.
  7. Apr 1, 2013 #6
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