Variable delivery, fixed displacement pump

Patent · Mon Jan 01 04:00:00 EST 2001

OSTI ID:873890

Sommars, Mark F ^[1]

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1. Sparland, IL

A variable delivery, fixed displacement pump comprises a plurality of pistons reciprocated within corresponding cylinders in a cylinder block. The pistons are reciprocated by rotation of a fixed angle swash plate connected to the pistons. The pistons and cylinders cooperate to define a plurality of fluid compression chambers each have a delivery outlet. A vent port is provided from each fluid compression chamber to vent fluid therefrom during at least a portion of the reciprocal stroke of the piston. Each piston and cylinder combination cooperates to close the associated vent port during another portion of the reciprocal stroke so that fluid is then pumped through the associated delivery outlet. The delivery rate of the pump is varied by adjusting the axial position of the swash plate relative to the cylinder block, which varies the duration of the piston stroke during which the vent port is closed.

• Research Organization: Caterpillar Inc. (Peoria, IL)
• DOE Contract Number: FC05-97OR22605
• Assignee: Caterpillar Inc. (Peoria, IL)
• Patent Number(s): US 6267561
• OSTI ID: 873890
• Country of Publication: United States
• Language: English

Related Subjects

/417/
adjusting
angle
associated
axial
axial position
block
chamber
chambers
close
closed
combination
compression
comprises
connected
cooperate
cooperates
corresponding
cylinder
cylinder block
cylinders
define
delivery
displacement
displacement pump
duration
fixed
fixed displacement
fluid
outlet
piston
piston stroke
pistons
plate
plurality
portion
position
provided
pump
pump comprises
pumped
rate
reciprocal
reciprocated
relative
rotation
stroke
swash
therefrom
variable
variable delivery
varied
varies