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Engineering machinery walking speed controlling and switching valve

A traveling speed, engineering machinery technology, applied in mechanical equipment, transmission control, components with teeth, etc., can solve the problem that the performance and traction power characteristics of mechanical traveling mechanism cannot be completely improved, the traveling speed cannot be obtained, and the structure of the transmission system is complex. and other problems, to achieve the effect of high integration, smooth speed switching, and simplifying the transmission structure of the machine

Inactive Publication Date: 2014-02-19
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hydraulic transmission can be combined with mechanical gearbox and inter-wheel differential, but it cannot completely improve the performance of mechanical traveling mechanism and traction power characteristics; hydraulic transmission can realize stepless speed change, but the speed adjustment range is small, and it cannot obtain greater driving speed Speed; hydraulic transmission combined with wheel-side reduction device can expand its speed regulation range, but the structure of the transmission system is complex and the cost is high

Method used

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  • Engineering machinery walking speed controlling and switching valve
  • Engineering machinery walking speed controlling and switching valve
  • Engineering machinery walking speed controlling and switching valve

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Embodiment Construction

[0012] Embodiment of the present invention: construction machinery walking speed control switching valve, including a valve body 1, in the valve body 1 there are four cavities 2 arranged in sequence from left to right and connected in sequence, the first cavity on the left is Cavity 2 is connected with the right motor oil outlet B2 and oil return circuit T, the second left cavity 2 is connected with the left motor oil outlet B1, and the first cavity 2 on the right is connected with the left motor The oil inlet passage A1 and the oil inlet passage P are connected to the right motor oil inlet passage A2 on the second cavity 2 on the right side; the valve core 3 passing through the four cavities 2 is arranged in the valve body 1, and the valve core 3 is installed in the valve The core 3 is provided with three bosses 4, the first boss 4 on the left side of the spool 3 corresponds to the connection position between the first cavity 2 on the left and the second cavity 2 on the left, ...

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Abstract

The invention discloses an engineering machinery walking speed controlling and switching valve. Oil inlet channels and oil outlet channels of two motors are formed in the same one valve body. By means of the switching valve structure design and the system matching design, the speed can be switched and adjusted on the work condition where an actuating device can normally work and is not shut down. Thus, a speed regulating range of engineering machinery hydraulic speed control is widened, and stepless speed change is achieved. The engineering machinery walking speed controlling and switching valve is simple in engineering machinery speed switching opening, stable in speed switching, free of impact in speed switching and capable of prolonging the service life of a hydraulic system. The engineering machinery walking speed controlling and switching valve integrates a serial connection function and a parallel connection function of a hydraulic motor system, so that the integration level is high. Meanwhile, a safety valve can be integrated on the switching valve to achieve a safety protection function of a system work circuit.

Description

technical field [0001] The invention relates to the field of machinery, in particular to a switching valve for controlling the walking speed of engineering machinery. Background technique [0002] At present, the walking speed control methods of construction machinery include mechanical transmission, hydraulic transmission, hydraulic transmission and their combination forms. Although the mechanical transmission has high efficiency, the speed adjustment range is small and only step transmission can be realized; considering the economy, the hydraulic transmission generally adopts a transmission mode that matches the mechanical transmission, and its starting torque is large, but the high-efficiency area is narrow; the hydraulic pressure of the vehicle Driving continuously variable speed has become an important development trend of modern construction machinery. Hydraulic transmission can be combined with mechanical gearbox and inter-wheel differential, but it cannot completely...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16H61/4035
CPCF16H61/0009F16H61/0265F16H61/0276F16H61/66F16H2061/0012
Inventor 罗艳蕾曾超陈伦军
Owner GUIZHOU UNIV
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