Axial pump assemblies
AssigneeMilwaukee Electric Tool Corporation
InventorJames O. Myrhum, Jr.
Life of this patent
Estimating the term…
Abstract
Embodiments of the invention provide a pump assembly for a hydraulic tool. The pump assembly can include a reciprocating element that is configured to move between a retracted position and an extended position, a cam surface in the reciprocating element that can engage cam followers, a rotating element that can receive rotational input, and a base that can at least partially surrounds the rotating element. Movement of the cam followers along the cam surface can move the reciprocating element from the retracted position to the extended position.
Claims19
An axial pump assembly for a hydraulic tool, the axial pump assembly comprising:
- a cycloidal disk that receives a rotational input that causes the cycloidal disk to rotate, the cycloidal disk having a plurality of through-holes extending in an axial direction;
- a base configured to house the cycloidal disk;
- a reciprocating disk defining a cam surface, the reciprocating disk configured to move in the axial direction between a retracted position and an extended position relative to the base;
- a plurality of bearings disposed between the base and the reciprocating disk and configured to travel along the cam surface of the reciprocating disk;
- and
- an eccentric bushing that is encircled by the cycloidal disk and configured to generate rotational eccentricity that drives cycloidal transmission.
An axial pump assembly for a hydraulic tool having a motor, the motor having a motor shaft extending in an axial direction, the axial pump assembly comprising:
- a reciprocating disk configured to move in the axial direction;
- a plurality of bearings configured to move along a cam surface;
- an eccentric bushing configured to drive cycloidal transmission of the axial pump assembly;
- a cycloidal disk operatively coupled to the motor shaft via the eccentric bushing;
- and
- a base having a plurality of base pins that extend in the axial direction and circumferentially surround the reciprocating disk,
- wherein, in operation of the axial pump assembly, rotation of the cycloidal disk drives movement of the plurality of bearings along the cam surface to cause reciprocating motion of the reciprocating disk between an extended position and a retracted position, and
- wherein, in the extended position, the bearings drive the reciprocating disk away from the base and in the retraction position, the bearings drive the reciprocating disk toward the base.
A method for driving a pump piston via an axial pump assembly, the method comprising:
- rotating a motor shaft and a cycloidal disk, the motor shaft extending in an axial direction and operatively coupled to the cycloidal disk via an eccentric bushing that drives cycloidal transmission of the axial pump assembly;
- driving one or more bearings, via the cycloidal disk, along a cam surface of a reciprocating disk causing the reciprocating disk to move between an extended position and a retracted position relative to the base in the axial direction;
- and
- translating reciprocating movement of the reciprocating disk to the pump piston.
Dependencies are inferred from the claim text.