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Engineering vehicle walking driving hydraulic system

A travel drive, hydraulic system technology, applied in the direction of fluid pressure actuation device, servo motor, mechanical equipment, etc., can solve the problem of inability to meet the control characteristics, and achieve the effect of soft driving characteristics

Inactive Publication Date: 2008-05-14
SANY HEAVY IND CO LTD (CN)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above-mentioned hydraulic system using a bi-directional hydraulic motor cannot meet the requirements of different control characteristics expected for forward and reverse during walking because the hydraulic motor has the same characteristics in the two rotation directions

Method used

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  • Engineering vehicle walking driving hydraulic system
  • Engineering vehicle walking driving hydraulic system

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Embodiment Construction

[0022] Please refer to FIG. 1 , which is a schematic diagram of the hydraulic principle of the driving hydraulic system of the construction vehicle provided by the first embodiment of the present invention.

[0023] As shown in the figure, the driving hydraulic system of the construction vehicle includes a two-way hydraulic pump 1 and a two-way hydraulic motor 2. Port A and reverse chamber oil port B. The two-way hydraulic motor 2 can rotate in two directions when the two-way hydraulic pump 1 provides hydraulic oil in different flow directions. The output characteristics of the two-way hydraulic motor 2 in the two rotation directions are consistent, but in actual use, the functions of the two rotation directions are different, wherein one rotation direction drives the vehicle forward, and the other rotation direction makes the vehicle reverse or brake. move. In order to distinguish the two oil ports of the two-way hydraulic motor, when the two-way hydraulic motor 2 is in the...

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Abstract

The invention discloses an engineering vehicle walking driving hydraulic system, comprising a bidirectional hydraulic pump and a bidirectional hydraulic motor. Two oil nozzles of the bidirectional hydraulic pump are respectively connected with the driving chamber oil nozzle and the backing chamber oil nozzle of the bidirectional hydraulic motor by connecting pipelines. By the connecting pipelines, the bidirectional hydraulic pump supplies oil for the bidirectional hydraulic motor; a driving chamber overflow valve and a backing chamber overflow valve with reverse overflow directions are arranged in parallelism between the two pipelines which connect the bidirectional hydraulic pump with the bidirectional hydraulic motor; wherein, the driving chamber overflow valve provides overflow loop for the bidirectional hydraulic motor driving chamber; the backing chamber overflow valve provides overflow loop for the bidirectional hydraulic motor; furthermore, the overflow pressure valve value of the driving chamber overflow valve is higher than that of the backing chamber overflow valve. Compared with the prior art, when the engineering vehicle walking driving hydraulic system provided by the invention carries out a backing operation, the highest stable working pressure is low, which leads the highest acceleration is low and the driving characteristic is flexible when the vehicle backs.

Description

technical field [0001] The invention relates to a traveling driving system of an engineering vehicle, in particular to a traveling driving hydraulic system of an engineering vehicle. Background technique [0002] There are many types of construction machinery and construction vehicles in different forms. Different types of construction machinery have different structures, but from a functional point of view, they are mainly divided into three parts: main engine, working device and traveling mechanism. Fixed equipment that only has a main engine and working devices, such as shoreside container cranes, tower cranes, etc.; passive construction machinery that has a main engine, working devices and traveling mechanisms but requires external force to walk, such as dragged concrete conveyors Pumps, towed road rollers, etc.; self-propelled engineering machinery or engineering vehicles that have a main engine, working devices, and travel drive mechanisms, such as concrete pump trucks...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F15B11/08
Inventor 曹显利李翠英
Owner SANY HEAVY IND CO LTD (CN)
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