Hydrostatic transmission with fixed fluid capacity ratio between pump and motor

Patent · Tue Dec 09 04:00:00 EST 1986

OSTI ID:6955915

Hutson, A I

A hydrostatic transmission is described comprising a hydraulic pump driven by an input shaft and in fluid communication with a hydraulic motor having an output shaft, the pump having a pump rotating element which at least in part generates a pumping action and is operatively connected to the input shaft. The motor has a motor rotatable element operatively connected to the output shaft and subjected to fluid flow from the pump and at least in part providing a rotating output to the output shaft. A housing has a center section of uniform width and is located between a pair of side sections, the center section being provided with a first opening of uniform cross section at least in part forming a pumping chamber and extending the width of the center section. The center section has a second opening of uniform cross section at least in part forming a motor chamber and also extending the width of the center section, the center section being of substantially the same width as the pumping chambers. The pumping chamber contains the pump rotating element with the fluid capacity of the pump being substantially proportional to the width of the pumping chamber. The motor chamber contains the motor rotatable element with the fluid capacity of the motor being substantially proportional to the width of the motor chamber. The pumping chamber and the motor chamber are in side-by-side relationship wherein a transmission of selectable capacity which can be obtained by utilizing a common pair of housing side sections and selecting a width of the center section to provide the desired transmission capacity and wherein a ratio of pump capacity to motor capacity remains constant regardless of the width of center section selected.

• Assignee: Sundstrand Corp., Rockford, IL
• Patent Number(s): US 4627237
• OSTI ID: 6955915
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
EQUIPMENT
FLUID FLOW
HYDRAULIC EQUIPMENT
HYDROSTATICS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MOTION
MOTORS
PUMPING
PUMPS
ROTATION
SHAFTS
VEHICLES