Device for controlling displacement of variable displacement hyd

Pumps – Condition responsive control of drive transmission or pump... – Plural pumps with individual or relative control

Patent

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

417218, 417222, F04B 4900

Patent

active

045990506

ABSTRACT:
Disclosed herein is a device for controlling displacement of a variable displacement hydraulic pump comprising a displacement control system for receiving a discharge pressure of the variable displacement hydraulic pump and a discharge pressure of a fixed displacement hydraulic pump to control the displacement of the variable displacement hydraulic pump. The displacement control system comprises a servopiston including a helical compression spring for maintaining the variable displacement hydraulic pump at a maximum swash angle in a neutral position of associated operating valve, a servovalve including a spool for selectively controlling communication of hydraulic pressure between a control pump and a pair of fluid chambers defined in the servopiston, a control piston connected through a control lever pivotably supported by a pivot pin to the spool and the servopiston, at least two helical compression springs for biasing the control piston and controlling torque and flow so as to approximate same to a constant torque curve, a floating spring seat interposed between the helical compression springs, and a guide rod for guiding the floating spring seat and accommodated in a bore formed in the housing at a base portion thereof to define a pressure chamber pressurized by a biasing spring, the pressure chamber being communicated through a conduit to a discharge passage of the fixed displacement hydraulic pump.

REFERENCES:
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4248574 (1981-02-01), Uehara et al.
patent: 4498847 (1985-02-01), Akiyama

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Device for controlling displacement of variable displacement hyd does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Device for controlling displacement of variable displacement hyd, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for controlling displacement of variable displacement hyd will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-1449209

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.