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Closed-core load balanced type full hydraulic steering gear

A technology of load balancing and steering gear, applied in the direction of fluid steering mechanism, etc., can solve the problem of not being able to stop steering work in time, and achieve the effect of improving driving comfort and safety, improving reliability and reducing impact.

Inactive Publication Date: 2012-08-01
DANFOSS POWER SOLUTIONS (JIANGSU) CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: In view of the above problems, the purpose of the present invention is to provide a closed-center load-balanced full-hydraulic steering gear to solve the problem of using a closed-center unresponsive full-hydraulic steering gear with a pilot flow amplifying reversing valve steering system for engineering wheeled vehicles The problem that the steering work cannot be stopped in time when the hydraulic steering gear stops rotating

Method used

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  • Closed-core load balanced type full hydraulic steering gear
  • Closed-core load balanced type full hydraulic steering gear
  • Closed-core load balanced type full hydraulic steering gear

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Embodiment 1: as attached figure 2 As shown, 1 is the closed-center load balancing full hydraulic steering gear of the present invention, 2 is the flow amplifying reversing valve, 3 is the flow amplifying reversing valve spool, 4 is the steering oil cylinder, and 5-8 are the closed-center load balancing type respectively. Oil inlet P of full hydraulic steering gear 1 1 , oil return port T 1 , Left working oil port L 1 , Right working oil port R 1 , 9-12 are respectively the oil inlet P of the flow amplification reversing valve 2 2 , oil return port T 2 , left oil outlet L 2 , right oil outlet R 2 , 13 is the left working oil port L 1 and right working oil port R 1 The damping hole passage opened at the place; the left working oil port 7 and the right working oil port 8 are respectively connected to the left end and the right end of the flow amplification reversing valve spool 3. The working principle of the steering hydraulic system applying the closed-center ...

Embodiment 2

[0037] Embodiment 2: basically the same as Embodiment 1, the difference is that when the closed-center load-balanced full-hydraulic steering gear 1 stops rotating and returns to the neutral position, all the orifice passages 13 communicate with the oil inlet 5, and the oil returns to the oil tank , that is, the left working oil port 7 and the right working oil port 8 are all connected to the oil inlet 5, so that the pressure at both ends of the flow amplification reversing valve spool 3 is balanced, so that the return spring of the flow amplifying reversing valve 2 can quickly make the The spool 3 of the flow amplifying reversing valve returns to the neutral position, so that the oil inlet 9 of the flow amplifying reversing valve 2 is disconnected from the left oil outlet 11 or the right oil outlet 12 of the flow amplifying reversing valve 2 in time, and the steering is cut off. Oil circuit, stop steering work in time.

[0038] as attached Figure 8 As shown, the rectangular ...

Embodiment 3

[0039] Embodiment 3: as attached Figure 9 , 10 As shown, it is basically the same as Embodiment 1 or Embodiment 2, the difference is that the orifice channel is directly widened on the oil passage groove of the spool.

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PUM

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Abstract

The invention discloses a closed-core load balanced type full hydraulic steering gear which comprises an oil inlet P1, an oil returning opening T1, a left operating oil opening L1 and a right operating oil opening R1. Damping hole channels are reserved at the left operating oil opening L1 and the right operating oil opening R1. When the steering gear is in the middle, the damping hole channels are communicated with the oil inlet P1 or the oil returning opening T1. The steering gear has the advantages that oil pressure of the operating oil openings at load ends reaches balance when the steering gear stops rotating, turning is stopped in time, flexibility and reliability of the steering gear are enhanced evidently, shaking of a vehicle is eliminated when the turning is stopped, impact is reduced and comfort and safety of the vehicle are enhanced.

Description

technical field [0001] The invention relates to a steering gear of a full-hydraulic steering system of a wheeled vehicle of construction machinery, in particular to a closed-center load full-hydraulic steering gear. Background technique [0002] In the current domestic market, closed heart non-response full hydraulic steering gear pilot flow amplified reversing valve steering system is often used in heavy-duty engineering vehicles, such as large forklifts, loaders, garbage trucks and other special vehicles weighing more than 100 tons. [0003] attached figure 1 Shown is the schematic diagram of the steering hydraulic system using the existing closed center non-response full hydraulic steering gear. In the figure: 1 is the steering gear, 2 is the flow amplification reversing valve, 3 is the flow amplification reversing valve spool, 4 is the steering Oil cylinders, 5-8 are respectively the oil inlet P of the steering gear 1 1 , oil return port T 1 , Left working oil port L ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B62D5/06
Inventor 李富刚
Owner DANFOSS POWER SOLUTIONS (JIANGSU) CO LTD