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Hydrostatic drive system

A hydrostatic drive, hydraulic circuit technology, used in fluid pressure actuation system components, fluid pressure actuation devices, motor vehicles, etc., can solve the pressure and efficiency loss, the application of pressure balance valves is expensive, and pressure balance valves are not effective, etc. question

Inactive Publication Date: 2014-12-24
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the use of pressure balancing valves is also not efficient as there may be pressure and efficiency losses, and applying pressure balancing valves is expensive

Method used

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Embodiment Construction

[0014] The present invention relates to a hydrostatic drive system of a machine, and more particularly to a system and method for maintaining the pressure balance between multiple hydraulic circuits of the hydrostatic drive system of the machine.

[0015] figure 1 An exemplary machine 100 is shown. In one aspect of the present invention, the machine 100 can be embodied as a grader that can perform various operations associated with industries such as mining, construction, agriculture, transportation, or any other industry known in the art. In various other embodiments, the machine 100 may be a cold flatbed machine, crop sprayer, skidder, road reclaimer, rotary mixer, soil compactor, and wheeled tractor-scraper.

[0016] In the illustrated embodiment, the machine 100 may include a front frame 102, a rear frame 104, and appliances 106 such as blades. The front frame 102 and the rear frame 104 are supported by a plurality of ground engaging members 108. The ground engaging member 10...

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PUM

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Abstract

A hydrostatic drive system for a machine is provided. The hydrostatic drive system includes a first hydraulic circuit, and a second hydraulic circuit. The first hydraulic circuit includes a first pump and a first hydraulic motor configured to selectively receive a flow of pressurized hydraulic fluid from the first pump at a first pressure. The second hydraulic circuit includes a second pump and a second hydraulic motor configured to selectively receive the flow of the pressurized hydraulic fluid from the second pump at a second pressure. The hydrostatic drive system further includes a controller configured to maintain a pressure balance between the first and the second hydraulic circuits based on a difference between the first pressure and the second pressure.

Description

Technical field [0001] The present invention relates to a hydrostatic drive system of a machine, and more particularly to a system and method for maintaining the pressure balance between multiple hydraulic circuits of the hydrostatic drive system. Background technique [0002] Large-wheelbase machines such as motor graders may have a hydrostatic drive system for driving the rear wheels or tracks, while the front wheels are used for steering. The hydrostatic drive system may include multiple hydraulic circuits associated with each wheel or track. It is often desirable to maintain pressure balance between multiple hydraulic circuits. [0003] During operation, there may be pressure fluctuations and imbalances between the individual hydraulic circuits of the hydrostatic drive system due to wheel size, calibration errors, or fluid leakage. The pressure imbalance between these hydraulic circuits can cause unnecessary rotation of the machine. In addition, in machines where the front w...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/17F15B21/02
CPCF16H61/4008B60Y2200/411E02F3/7645E02F9/2235E02F9/2253F16H61/4035F16H61/44F16H2059/6861
Inventor C·E·斯托尔
Owner CATERPILLAR INC
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