Novel forklift-walking speed-regulating device

A technology of speed regulating device and forklift truck, which is applied in the direction of lifting device, control device, fluid pressure actuating device, etc., can solve the problems of reducing system efficiency, wasting the output power of prime mover, increasing the volume and weight of the whole machine, and achieving a simplified mechanism , The effect of improving efficiency and reducing overflow loss

Inactive Publication Date: 2003-03-26
ZHEJIANG JIALI TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the general open hydraulic speed control circuit must be equipped with a matching high-power prime mover. However, counterbalanced forklifts often do not operate under high-load conditions that occur simultaneously with large traction and high speed, but at a relatively moderate load. This will inevitably lead to a waste of the output power of the prime mover; at the same time, it will increase the volume and weight of the whole machine, and the prime mover will work under low load conditions for a long time, reducing the system efficiency

Method used

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  • Novel forklift-walking speed-regulating device
  • Novel forklift-walking speed-regulating device
  • Novel forklift-walking speed-regulating device

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Embodiment Construction

[0015] Such as figure 1 As shown, the two two-speed hydraulic motors 12 used to drive the driving wheels of the forklift communicate with the variable pump 1 through the two-position three-way valve 13, the reversing valve 9, the throttle valve 8 and the priority valve 7 in sequence, and the reversing valve 9 There is a buffer replenishment valve 10 composed of a one-way valve and a relief valve, and a brake 11 is installed on a two-speed hydraulic motor 12; the oil outlet of the variable pump 1 passes through the control valve 4, the low-pressure servo pressure regulating valve 6 and the high-pressure servo pressure regulating valve. Valve 5 communicates with the variable cylinder 2 used to adjust the displacement of the variable pump. The variable pump can be an external feedback vane variable pump. The variable oil cylinder 2 is connected with the limit oil cylinder 3 controlled by the control valve 4, the piston rod of the limit oil cylinder 3 extends to the oil inlet cham...

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Abstract

The present invention relates to a new type fork lifter walking speed-regulating equipment, which comprises variable displacement pump and double-speed hydraulic motor communicated with the variable displacement pump by means of reversing valve. It is characterized by that oil outlet of hydraulic pump is connected with oil inlet of high-lower pressure servo pressure-regulating valve, the working oil hole of the high-lower pressure servo pressure-regulating valve is connected with oil intake cavity of variable displacement oil cylinder for regulating displacement of variable displacement pump, and between reversing valve and hydraulic pump a precedence valve is set.

Description

【Technical field】 [0001] The invention relates to a fluid transmission executive device, especially a new type of forklift travel speed regulating device, which controls the output of the pump and the displacement of the motor to obtain various external traction characteristics, and realizes the coordination of the travel system, the steering system and the working device at the same time. Common pump oil supply. 【Background technique】 [0002] The static pressure driving device of the existing counterbalanced forklift usually includes a combination of a variable pump and a quantitative motor or a combination of a fixed pump and a variable motor, supplemented by a speed change mechanism for speed regulation. Generally, two hydraulic circuits are used to realize: one It is an independent closed hydraulic speed regulating circuit, and the other is an open hydraulic speed regulating circuit. [0003] When an independent closed hydraulic speed control circuit is used, the drive...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B60K17/10B60K17/14B66F9/06F15B7/00
Inventor 刘钊关景泰
Owner ZHEJIANG JIALI TECH
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