> This is an interesting idea. I wonder what the losses are
> for the hydraulic pump and swash plate hydraulic motor?
> I assume the hydraulic motor is variable speed which would allow
> a lot of flexibility between the power of the turbine
> and the speed of the engine.
>
> For some strange reason no mention of it is made on their website.
>
http://www.woodward.com/
> This is an old established company with a lot of capabilities.
>
> I have one of their prop governors on my C182.
>
> Paul Lamar
http://www.fool.com/investing/general/2008/11/24/top-of-the-morning-woodward-governor.aspx?terms=wgov&vstest=search_042607_linkdefault
<http://www.fool.com/investing/general/2008/11/24/top-of-the-morning-woodward-governor.aspx?terms=wgov&vstest=search_042607_linkdefault>
Fool.com says they've been around since the 1870's.
-- Jeffrey John Martin
Great site.
Thanks.
Paul Lamar
Paul,
Didn't we talk about the use of a hydraulic motor turbo-compound around
a year ago? I guess everything old is new again! At least the discussion
was about a possible method of TC. The real question is how efficient
the system is.
Bill Jepson
Could be. I tried calling the company today but they are on vacation
to the 4th. I think the losses will be too great. The weight and cost
will be high as swash plate hyd motors are not cheap.
Paul Lamar
Paul,
My thoughts were IIRC that the hydraulic motors we have been seeing to
this point have been for low-speed land vechicles, and therefore made
with little reguard for weight. Somebody posted a new Honda scooter that
had a full automatic transmission as a possibility for a source of a
light-weight Hyd. motor. that is a good idea provided the pump can be
light as well.
Bill Jepson
SYSTEM OVERVIEW
In a very simplified description, the Hondamatic hydraulic transmission
uses the engine to drive a hydraulic pump that forces hydraulic fluid through
sequential pistons. On the other side of these pistons, the pressurized fluid
enters a second set of pistons that push against an angled plate (called a swash
plate). Because the cylinder body holding the pistons is splined to the output
shaft, the pressure exerted on the swash plate causes the cylinder body to
rotate. When the angle of the hydraulic motor swash plate is adjusted, the
cylinder body (and, therefore, the output shaft) rotates faster or slower,
resulting in higher or lower output drive ratios. When either of the two
automatic transmission modes (D1-Maximum Performance or D2-Maximum Torque) is
selected, the Engine Control Unit (ECU) continuously monitors input from six
sensors to position the motor-side swash plate at the optimal ratio. Using the
ESP mode, the ECU instructs the control motor to move the hydraulic motor plate
to preset angles to simulate specific gear selection.
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