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Hydrostatic drive system with variable charge pump

A hydraulic system, variable technology, applied in the direction of fluid pressure actuation system components, elements with teeth, fluid pressure actuation devices, etc., can solve problems such as increasing system complexity, increasing system cost, increasing system failure, etc.

Inactive Publication Date: 2010-03-17
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Use of additional components increases system complexity and increases system cost
Additionally, the use of additional components increases the likelihood of system failure due to component failure

Method used

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  • Hydrostatic drive system with variable charge pump
  • Hydrostatic drive system with variable charge pump
  • Hydrostatic drive system with variable charge pump

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0016] figure 1 An exemplary machine 10 is shown. Machine 10 may be a mobile machine performing some type of operation associated with industries such as mining, construction, agriculture, transportation, or any other industry known in the art. For example, machine 10 may be a track-type tractor ( figure 1 shown in ), hydraulic excavators, skid steer loaders, farm tractors, wheel loaders, motor graders, backhoes, or any other machinery known in the art. Machine 10 may include a frame 12 , at least one work implement 14 , a power source 16 , and at least one traction device 18 .

[0017] Frame 12 may include any structural unit that supports movement of machine 10 and / or work implement 14 . Frame 12 may be, for example, a fixed base frame connecting power source 16 to traction device 18, a movable frame member of a linkage system, or any other frame known in the art.

[0018] Work performer 14 may include any device for performing a task. For example, work implement 14 may...

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PUM

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Abstract

A hydraulic system (20) is provided having a reservoir (25) configured to hold a supply of fluid. The hydraulic system also has a variable displacement pump (36) configured to supply charge fluid andpilot control fluid to the hydraulic system. In addition, the hydraulic system has a closed-loop portion (32) configured to receive charge fluid from the variable displacement pump and drive a mechanism (22). The hydraulic system further has a pilot fluid supply portion (28) configured to direct pilot control fluid from the variable displacement pump to the closed-loop portion.

Description

technical field [0001] The present invention relates to hydrostatic drive systems, and more particularly to hydrostatic drive systems having variable charge pumps that provide pressurized makeup and pilot fluid. Background technique [0002] Differential steering systems are commonly used in many types of vehicles including, for example, vehicles designed for construction-related activities. Each of these vehicles generally includes at least two ground engaging traction devices, which may be, for example, drive belts, tracks or tires. Ground contact hitches are provided on opposite sides of the vehicle and can be rotated to propel the vehicle along a selected route. [0003] Differential steering steers the vehicle along a selected route by changing the relative speed of traction devices on the ground. For example, to turn the vehicle to the left, the left contact-engaging traction must rotate at a slower speed than the right contact-contacting traction or in the opposite ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/42E02F9/22F15B21/04F16H61/40F16H61/4096F16H61/4139F16H61/433
CPCE02F9/2217E02F9/226F15B2211/613F15B2211/605F15B21/005E02F9/225F15B2211/25F15B2211/20546F16H61/4139F16H61/4096F16H61/433E02F9/2296
Inventor S·C·加尼特M·J·格里克尼克R·A·哈劳D·J·麦金太尔E·D·斯坦姆勒T·L·汉德A·亨德泽尔R·R·哈肯N·G·麦克罗斯蒂
Owner CATERPILLAR INC
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