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Multi-chamber rotary piston actuator

A technology of fluid actuators and pistons, which can be used in fluid pressure actuators, mechanically driven excavators/dredgers, energy industry, etc., and can solve the problem that actuators cannot be scaled well

Active Publication Date: 2020-01-03
WOODWARD GOVERNOR CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, such actuator designs do not scale well to provide the field availability and / or power-to-weight ratio, field availability characteristics, stiffness, holding capacity, rotational Combination of moment-to-weight ratio, slew rate, energy efficiency, e.g. actuation of the vertical joint of the arm

Method used

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  • Multi-chamber rotary piston actuator
  • Multi-chamber rotary piston actuator
  • Multi-chamber rotary piston actuator

Examples

Experimental program
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Embodiment Construction

[0178] This document describes a device for generating a rotational movement. In particular, this document describes devices that can convert fluid displacement into rotary motion by using components more commonly used to generate linear motion, such as hydraulic or pneumatic linear cylinders. Vane rotary actuators are relatively compact devices for converting fluid motion into rotary motion.

[0179] figure 1 is a schematic diagram of an exemplary prior art excavator 100 . Excavator 100 includes a "cabin" or "cab" 110 that rides on a tracked, wheeled, other generally otherwise movable undercarriage 120 . Extending from the cabin 110 is an articulated boom 130 comprising an arm portion 132 and an arm portion 134 . Arm portion 132 and arm portion 134 are pivotally connected at joint 135 . Arm portion 134 and bucket 140 are pivotally connected at joint 142 . Linear piston 150 and linear piston 160 provide power to actuate arm portion 134 and bucket 140 , such as to steer bu...

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PUM

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Abstract

The subject matter of this specification can be embodied in, among other things, a fluid actuator including a housing defining a first chamber having a first cavity and a first open end, a first piston assembly including a tubular first piston defining a second chamber having a second cavity and a second open end, disposed in said first housing for reciprocal movement in the first chamber throughthe first open end, wherein a first seal, the first cavity, and the first piston define a first pressure chamber, and a second piston assembly having an second piston disposed in said first piston assembly for reciprocal movement in the second chamber through the second open end, wherein a second seal, the second cavity, and the second piston define a second pressure chamber, and a first portion of the second piston contacts a first end effector.

Description

[0001] priority statement [0002] This application claims priority from: U.S. Provisional Patent Application No. 62 / 371,317, filed August 5, 2016; U.S. Provisional Patent Application No. 62 / 449,879, filed January 24, 2017; filed August 4, 2017 U.S. Patent Application No. 15 / 669,186; and U.S. Patent Application No. 15 / 669,314, filed August 4, 2017, the contents of which are incorporated herein by reference. technical field [0003] The present invention relates to actuator arrangements, and more particularly to rotary piston actuator arrangements in which a piston of a rotor is moved by a fluid under pressure. Background technique [0004] Various forms of linear hydraulic actuators are currently used in industrial machinery power conversion applications. A common industrial use is in construction machinery (eg, excavators, backhoe loaders), where the linear motion of a hydraulic piston is translated into rotational motion about a joint. [0005] In certain applications, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B15/12
CPCF15B15/125E02F9/2271E02F3/32E02F3/3677E02F9/006E02F9/2264Y02P80/10B25J17/025B25J9/146B25J9/148
Inventor K·E·沙鲁迪N·波利
Owner WOODWARD GOVERNOR CO