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Closed loop drive circuit with open circuit pump assist for high speed travel

An open-loop and closed-loop technology, applied in components with teeth, servo meter circuits, transmission control, etc., can solve problems such as the inability to increase the speed of closed-loop drive

Inactive Publication Date: 2013-08-21
CATERPILLAR INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to this arrangement, the system may not be able to increase the drive speed in a closed loop and therefore may not be able to move a vehicle equipped with such a hydraulic drive faster

Method used

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  • Closed loop drive circuit with open circuit pump assist for high speed travel
  • Closed loop drive circuit with open circuit pump assist for high speed travel
  • Closed loop drive circuit with open circuit pump assist for high speed travel

Examples

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Embodiment Construction

[0032] Reference will now be made in detail to the accompanying drawings. Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts.

[0033] figure 1 A vehicle 10 is shown, such as a wheeled excavator. Vehicle 10 may include a power source 12 and a frame 14 that may be operably attached to a chassis 16 . Vehicle 10 may also include a traction system 18 , such as a plurality of wheels 17 , which may be operatively attached to chassis 16 . Additionally, vehicle 10 may include work implement 20 and an operator station 22 from which work implement 20 may be controlled.

[0034] although figure 1 is shown as a wheeled excavator, but vehicle 10 may be any type of work machine with operator-controlled steering and travel. For example, vehicle 10 may include a wheel loader, motor grader, backhoe loader, skid steer loader, track tractor, track excavator, and any other type of work vehicle with operator-controlled steerin...

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PUM

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Abstract

The present disclosure refers to a hydrostatic drive system for a vehicle (10), which may comprise an open circuit (100), a closed circuit (120), and a combiner valve (118). The open circuit (100) may include a main hydraulic pump (102) configured to be driven by an internal combustion engine (12), and configured to drive at least one hydraulic consumer (34, 44, 50). The closed circuit (120) may include an auxiliary hydraulic pump (170) configured to travel the vehicle (10), and a hydraulic motor (146) connected to the auxiliary hydraulic pump (170). A pressure-relief valve (164) is sized and configured to drain the hydraulic fluid circulating within the closed circuit (120) and exceeding the maximum capacity of the auxiliary pump (170) to a reservoir (300) even if hydraulic fluid is diverted from the open circuit (100) into the closed circuit (120). The combiner valve (118) is connected to both the open circuit (100) and the closed circuit (120). The combiner valve (118) may be configured to connect the open circuit (100) to the closed hydraulic circuit (120) such that a part of the hydraulic fluid circulating in the open circuit (100) is diverted into the closed circuit (120). The present disclosure also refers to a method of operating a vehicle (10).

Description

technical field [0001] The present invention relates to a hydrostatic drive system (hydrostatic drive system) for vehicles, and in particular to a hydrostatic drive system. The hydrostatic drive system includes an open hydraulic circuit and a closed hydraulic circuit. The open hydraulic circuit includes a main hydraulic pump configured to be driven by the internal combustion engine and drive at least one hydraulic load, and the closed hydraulic circuit includes an auxiliary hydraulic pump configured to drive a hydraulic motor for driving the vehicle. [0002] Furthermore, the invention relates to a method for operating a vehicle, in particular a self-propelled construction machine such as a wheeled excavator. Background technique [0003] Vehicles with hydrostatic drive systems, like self-propelled construction machines, are generally subject to extreme fluctuations with regard to the loads to be handled and the vehicle speeds to be achieved. The internal combustion engine,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02F9/22B62D11/18F15B11/17F16H61/4139
CPCE02F9/2242E02F9/2253E02F9/2289E02F9/2292E02F9/2296F15B2211/20546F15B2211/20569F15B2211/20576F15B2211/50527F15B2211/611F15B2211/7058F16H61/4078F15B15/00
Inventor T·贝格
Owner CATERPILLAR INC