What is Charge Pressure in Hydrostatic Transmission
What is Charge Pressure in Hydrostatic Transmission
(OP)
As the title suggest, can you guys shed some light on what is charge pressure and what it does in a hydrostatic transmission ?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
What is Charge Pressure in Hydrostatic Transmission
|
What is Charge Pressure in Hydrostatic TransmissionWhat is Charge Pressure in Hydrostatic Transmission(OP)
As the title suggest, can you guys shed some light on what is charge pressure and what it does in a hydrostatic transmission ?
Red Flag SubmittedThank you for helping keep Eng-Tips Forums free from inappropriate posts. Reply To This ThreadPosting in the Eng-Tips forums is a member-only feature.Click Here to join Eng-Tips and talk with other members! |
ResourcesWhat is rapid injection molding? For engineers working with tight product design timelines, rapid injection molding can be a critical tool for prototyping and testing functional models. Download Now
The world has changed considerably since the 1980s, when CAD first started displacing drafting tables. Download Now
Prototyping has always been a critical part of product development. Download Now
As the cloud is increasingly adopted for product development, questions remain as to just how cloud software tools compare to on-premise solutions. Download Now
|
RE: What is Charge Pressure in Hydrostatic Transmission
The other function of the Charge Pump is to supply Pilot Oil to the Pump and/or Motor control circuits to change flow volume and/or direction.
On some circuits the Charge Pump is also used to power auxilliary equipment such as the Mower Deck lift on my Lawn Tractor.
Bud Trinkel CFPE
HYDRA-PNEU CONSULTING, INC.
fluidpower1 @ hotmail.com
http://www.fluidpower1.us
RE: What is Charge Pressure in Hydrostatic Transmission
The charge pump also provides positive pressure, 250-400 psi, to force fluid into the inlet passages of the valve block (into the pump) and prevent cavitation in the loop. The flow through hst pump porting is much higher than could be achieved with a common 15 psi atmospheric inlet open loop pump.
Hst pumps must also have this postive pressure in the pistons to stay in 'compression' as it were, to keep the slippers and shoes all down against the swash plate as they rotate. If they go into suction the joints become in 'tension' through part of the revolution and the pump mechanically destroys itself fairly quickly. Most hst pumps are designed so the servo system loses control of the pistons (i.e. the pump goes to no flow output) before the charge pressure gets so low it damages the pump.
k
RE: What is Charge Pressure in Hydrostatic Transmission
Good points. I had never thought about those aspects of the Charge circuit. I will be adding these to my pump lessons.
Bud Trinkel CFPE
HYDRA-PNEU CONSULTING, INC.
fluidpower1 @ hotmail.com
http://www.fluidpower1.us