Back to results
US 11,441,551 B2Granted
Portable hydraulic power unit
AssigneeGraco Minnesota Inc.
InventorsCharles W. Dawson, Mariusz J. Luczak, Barry W. Mattson, Douglas S. Ryder, Bret A. Deneson, Christopher A. Lins
Life of this patent
Estimating the term…
Abstract
A portable hydraulic power unit includes a frame, a fluid tank supported by the frame, and a manifold supported by the frame. The fluid tank is configured to store a supply of hydraulic fluid for powering a hydraulically-driven tool. A reciprocating pump is mounted on the exterior of the fluid tank and on the exterior of the manifold. The reciprocating pump is secured to the fluid tank and the manifold with fasteners extending through a cylinder body of the reciprocating pump.
Claims18
A hydraulic power unit configured to output a driving flow of hydraulic fluid to a downstream location to power a tool and configured to receive a return of the hydraulic fluid from the downstream location, the hydraulic power unit comprising:
- a frame;
- a fluid tank supported by the frame, the fluid tank configured to store a supply of the hydraulic fluid;
- a hydraulic circuit configured to draw the hydraulic fluid from the fluid tank and output the hydraulic fluid at a downstream location;
- a manifold supported by the frame, the manifold forming at least a portion of the hydraulic circuit;
- a first reciprocating pump configured to draw hydraulic fluid from the fluid tank and provide a first hydraulic flow to the hydraulic circuit, wherein the first reciprocating pump includes:
- a first piston having a first piston rod extending out of a first cylinder body, a first head disposed at an end of the first piston rod disposed outside of the first cylinder body, and a first internal valve, the first piston configured to reciprocate on a piston axis;
- wherein the first cylinder body includes:
- a first fluid inlet extends through a first lower portion of the first cylinder body and a first fluid outlet extends through a first upper portion of the first cylinder body, the first fluid outlet fluidly connected to the hydraulic circuit;
- wherein the first upper portion comprises a first upper mounting portion having a first upper face interfacing with a manifold exterior side of the manifold, the first fluid outlet extending through the first upper face;
- wherein the first lower portion comprises a first lower mounting portion having a first lower face interfacing with a tank exterior side of the fluid tank, the first fluid inlet extending through the first lower face
- wherein the first reciprocating pump is configured to output the first hydraulic flow during both an upstroke of the first piston and a downstroke of the first piston;
- a second reciprocating pump configured to draw hydraulic fluid from the fluid tank and provide a second hydraulic flow to the hydraulic circuit;
- and
- a drive mechanism configured to convert rotational motion from a motor to linear reciprocating motion to drive reciprocation of the first piston, wherein the first piston is connected to the drive mechanism by the first head being disposed in a first slot of a reciprocating collar of the drive mechanism;
- wherein the hydraulic circuit includes a first fluid line extending to the downstream location, the hydraulic circuit configured to provide the first hydraulic flow and the second hydraulic flow to the first fluid line, and wherein the hydraulic circuit is configured to receive a return flow of the hydraulic fluid from the downstream location through the first fluid line, and the hydraulic circuit is configured to provide the return flow to the fluid tank.
12 more elements
A hydraulic power unit comprising:
- a frame;
- a fluid tank supported by the frame, the fluid tank configured to store a supply of the hydraulic fluid;
- a hydraulic circuit configured to draw the hydraulic fluid from the fluid tank and output the hydraulic fluid at a downstream location;
- a manifold supported by the frame, the manifold forming at least a portion of the hydraulic circuit;
- a first reciprocating pump configured to draw hydraulic fluid from the fluid tank and provide a first flow of hydraulic fluid to the hydraulic circuit, wherein the first reciprocating pump comprises:
- a first cylinder body having a first fluid inlet extending into a first lower portion, and a first fluid outlet extending through a first upper portion of the first cylinder body wherein the first fluid outlet is fluidly connected to the hydraulic circuit;
- and
- a first piston at least partially disposed within the first cylinder body;
- wherein the first upper portion comprises a first upper mounting portion having a first upper face interfacing with a manifold exterior side of the manifold, the first fluid outlet extending through the first upper face;
- wherein the first lower portion comprises a first lower mounting portion having a first lower face interfacing with a tank exterior side of the fluid tank, the first fluid inlet extending through the first lower face;
- and
- a second reciprocating pump configured to draw hydraulic fluid from the fluid tank and provide a second flow of hydraulic fluid to the hydraulic fluid circuit;
- wherein the first reciprocating pump includes a first piston having a first internal check valve and is configured to output the first flow during both an upstroke of the first piston and a downstroke of the first piston, and the first piston is configured to reciprocate within a first cylinder and relative to a first dynamic seal disposed within the first cylinder and relative to a second dynamic seal disposed within the first cylinder;
- wherein the second reciprocating pump includes a second piston having a second internal check valve and is configured to output the second flow during both an upstroke of the second piston and a downstroke of the second piston;
- wherein the first reciprocating pump and the second reciprocating pump are mechanically linked such that the first reciprocating pump and the second reciprocating pump simultaneously output the first flow and the second flow;
- wherein the first reciprocating pump and the second reciprocating pump have different displacement volumes per stroke;
- and
- wherein the hydraulic circuit is configured to combine the first flow and the second flow into a combined flow and provide the combined flow to a downstream location, and wherein the hydraulic circuit is configured to receive a return flow from the downstream location and provide the return flow to the fluid tank.
15 more elements
Dependencies are inferred from the claim text.