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Automatic changeover of hydraulic drive systems

Technology of a drive system, hydraulic motor

Active Publication Date: 2017-01-18
CLARK EQUIP CO INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Optionally, the operator can reduce the movement input to reduce the movement signal to the hydraulic pump and avoid a stall situation, but even a skilled operator will have great difficulty discovering possible ways of maximizing the action of this powered machine and avoiding a stall situation

Method used

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  • Automatic changeover of hydraulic drive systems
  • Automatic changeover of hydraulic drive systems
  • Automatic changeover of hydraulic drive systems

Examples

Experimental program
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Embodiment Construction

[0019] Before describing the embodiments in detail, it is to be appreciated that the embodiments described herein are not limited in application to the details of construction and the arrangement of parts set forth in the following description or shown in the following drawings. Also, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of words such as "comprises," "comprising," and "having," and variations thereof, as used herein, means the inclusion of the items listed thereafter, equivalents thereof as well as additional items. Unless otherwise stated or limited, the terms "mount", "connect", "support" and "join" and variations thereof are used broadly and encompass both direct and indirect mounting, connecting, supporting and joining. Furthermore, "connected" and "coupled" are not limited to physical or mechanical connections or linkages.

[0020] figure 1 with 1A A po...

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PUM

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Abstract

The present invention discloses a drive system (100) for propelling a power machine (10) on a support surface. The drive system includes a hydraulic source (110) and a drive assembly (115). The drive assembly has a hydraulic motor (118) in fluid communication with a hydraulic source switchable between first and second displacement configurations. A shift valve (202) receives pressurized fluid from a hydraulic source and provides a shift signal (198) to the hydraulic motor to selectively shift the displacement of the hydraulic motor between first and second displacement configurations. Also provided is a sensing device (214) capable of generating a load signal indicative of a load status provided by the drive assembly. An electronic controller (210) provides a control signal (208) to the switch valve to control displacement of the hydraulic motor in response at least in part to the load signal.

Description

technical field [0001] The present invention relates to power machines. More specifically, the present invention relates to drive systems for power machines. Many power machines, such as excavators, wheel loaders including skid steer loaders and steered axle loaders, track loaders, and similar machines include hydraulic or hydrostatic drive systems for propelling the power machine over a support surface. One component in many machines of this type is a drive motor that receives power in the form of pressurized hydraulic fluid from a power source and converts that power into rotational motion to drive one or more wheels, tracks, or other similar Device to move powered machinery on a support surface. For a given pressure and flow rate, a motor with a relatively higher displacement delivers higher torque, but at a lower speed than a motor with a relatively lower displacement. Background technique [0002] In certain cases, a power machine with a higher displacement electric ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02F9/22
CPCE02F9/2253E02F9/2296F16H61/421F15B13/00
Inventor 帕特里克·P·拉舍尔丹尼尔·J·克里格甘特·G·马特
Owner CLARK EQUIP CO INC