Single piece yoke stroking device for bent axis type hydraulic pumps and variable motors
AssigneeSauer Inc.
InventorsJohn P. Fleming, Scott D. Meyer, Dave D. Dirks
Life of this patent
Estimating the term…
Abstract
A device for varying the displacement of a variable displacement bent axis unit includes a one-piece yoke having a bucket portion adapted to carry a cylinder block kit of the bent axis unit, a trunnion bearing portion for swing control on one side of the bucket portion, and a trunnion portion for fluid porting on the other side of the bucket portion. The bucket portion has a bottom wall, a continuous side wall, and an open top. Inside the yoke is a pair of fluid passages intersecting the interior of the bucket portion and extending separately and entirely within the bottom wall and the side wall before opening onto the trunnion portion for fluid porting.
Claims18
A device for varying displacement of a variable displacement bent axis unit comprising:
- a housing and a rotatable cylinder block kit disposed inside the housing;
- a one-piece swingable yoke pivotally mounted in the housing and carrying the cylinder block kit;
- the yoke comprising a bucket portion for supporting the cylinder block kit and a pair of generally opposing arms extending from the bucket portion
- one of the arms defining a trunnion bearing portion for swing control, and the other of the arms defining a trunnion portion for fluid porting on the opposing arm, together the trunnion bearing portion and the trunnion portion for fluid porting defining a pivot axis for swinging the yoke;
- the bucket portion of the yoke including a bottom wall, at least one continuous side wall extending upwardly from the bottom wall, and an open top defining a hollow in the bucket portion;
- and
- the hollow and the trunnion portion for porting being fluidly connected by a pair of spaced apart fluid passages extending continuously completely within the bottom wall and the side wall to the trunnion portion for porting.
A device for varying fluid displacement in a variable displacement bent axis unit comprising:
- a swingable yoke including a bucket portion and being pivotally supported along a pivot axis defined by first and second trunnions portions extending from the bucket portion in generally opposite directions;
- the bucket portion having first and second spaced apart system ports therein;
- one of the first and second trunnion portions having third and fourth spaced apart system ports thereon;
- a pair of continuous unbroken fluid passages respectively interconnecting the first port with the third port and the second port with the fourth port without extending outside of the bucket portion.
A device for varying fluid displacement in a variable displacement bent axis unit comprising:
- a pivotal yoke including a bucket portion and integral first and second trunnion portions extending in generally opposite directions from the bucket portion so as to together define a pivot axis for swinging the yoke and thereby varying the fluid displacement of the unit;
- the bucket portion including a pair of spaced apart system pressure ports therein and a pair of spaced apart system pressure fluid passageways beginning at said pair of ports respectively and extending separately and completely within the bucket portion to the first trunnion portion, both of the passageways opening onto the first trunnion portion.
A bent axis hydraulic unit comprising:
- a housing;
- a main shaft rotatably supported in the housing;
- a pair of system pressure ports in the housing;
- a swingable one-piece yoke pivotally mounted in the housing, the yoke including a bucket portion and an elongated pivot arm extending from the bucket portion to define a pivot axis for the bucket portion of the yoke;
- the bucket portion of the yoke including a bottom wall and at least one side wall integrally formed with the bottom wall and extending upwardly therefrom to define an interior of the bucket portion;
- the pivot arm having a pair of separate system pressure passageways in fluid communication respectively with the system pressure ports in the housing, the pair of passageways extending into the elongated pivot arm and then extending entirely within the elongated pivot arm into the at least one side wall of the bucket portion and then extending downwardly entirely within the at least one side wall and into the bottom wall, the passageways then extending entirely within the bottom wall until opening into a pair of separate ports disposed in the interior of the bucket portion and located on an upper surface of the bottom wall;
- a cylinder block kit swingably carried by the yoke, the cylinder block kit being rotatably mounted in the interior of the bucket portion and supported by the bottom wall of the bucket portion, the cylinder block kit being in fluid communication with the system pressure ports in the housing through the pair of system pressure passageways and the respective ports located on the bottom wall, the cylinder block kit being drivingly connected to the main shaft of the unit;
- means for pivoting the yoke and thereby the cylinder block kit with respect to the housing and the main shaft.
Dependencies are inferred from the claim text.