KR0142287B1 - Hydraulic pressure driving control system for construction heavy machine - Google Patents

Abstract

It is to control the running speed by controlling the swash plate rotation of variable displacement axial piston motor which drives the machine by generating rotational force by receiving pressure oil from the pump. In a swash plate hydraulic motor in which the shoe 2 installed at the first end contacts the swash plate 3 and rotates about the motor side 4, the first light warp piston 6 is positioned in the rotation axis direction with respect to the pivot joint of the swash plate center, eccentric to the rotation axis, A stopper plate 8 for controlling the strokes of the second light piston and the second light piston is positioned in the direction opposite to the axis of rotation relative to the pivot joint, and the first light pilot pilot pressure passage 9 and the second light pilot pilot pressure passage 10 When this does not work, the swash plate is warped at the maximum angle of swivel, and the pilot pressure acts on the first slit pilot pressure flow path. When the pilot pressure does not act on the two warp pilot pressure flow paths, the swash plate is warped to the minimum warp angle, and when the pilot pressure acts on the first warp pilot pressure flow path and the second warp pilot pressure flow path simultaneously, Hydraulic traveling control system of civil heavy equipment, characterized in that the warp to any middle angle between the maximum warp angle.

Description

Hydraulic Driving Control System of Civil Heavy Equipment

1 is a cross-sectional view showing a swash plate maximum tilt angle control according to the present invention.

b) A cross-sectional view showing the swash plate tilt angle control at an arbitrary position between the swash plate maximum tilt angle and the minimum tilt angle according to the present invention.

c) A cross-sectional view showing the swash plate minimum tilt angle control according to the present invention.

d) Hydraulic circuit diagram related to the hydraulic traveling system according to the present invention.

2 is a cross-sectional view showing a swash plate maximum tilt angle control according to the prior art.

b) A cross-sectional view showing the swash plate minimum tilt angle control according to the prior art.

c) Hydraulic circuit diagram related to the hydraulic traveling system according to the prior art.

* Explanation of symbols for main parts of the drawings

1: piston 2: shoe

3: swash plate 4: motor shaft

5: pivot joint 6: first warp piston

7: second script piston 8 stopper plate

9: 1st scripture pilot pressure flow path 10: 2nd scripture pilot pressure flow path

11: cylinder block

The present invention relates to a hydraulic traveling control system for construction heavy equipment, and more particularly, to control the traveling speed by controlling the swash plate of the variable displacement axial piston motor that drives the equipment by generating pressure by receiving pressure from a pump. It's about things.

Conventional swash plate control of a hydraulic traveling motor is performed by applying a plurality of pistons to a cylinder block connected to a motor rotation shaft as shown in FIG. 2 (JP-JP 59-113274, Japanese Patent 63-235702 and HEI 1-176759). Insert the piston at the end of the piston in contact with the swash plate and rotate it around the motor shaft. By the parallel condition, the rotary motion is performed at an arbitrary maximum warp angle, and when the hydraulic oil is supplied to the warp piston chamber, the warp piston switches the swash plate in the direction of the low warp angle to control the traveling speed.

The hydraulic driving control system having the above function is limited to two swash angles of the swash plate tilt angle, thereby narrowing the selection of the speed change and having insufficient engine horsepower.

The present invention is to enable the swash plate tilt angle control pointed out in the above-mentioned problems of the prior art, to widen the range of speed change and to fully use engine horsepower.

The construction of the present invention for achieving the above object will be described in detail with reference to the accompanying drawings.

In a swash plate type hydraulic motor in which a shoe (2) installed at the tip of the piston (1) contacts the swash plate (3) and rotates around the motor side (4) in a hydraulic motor driving system that is a hydraulic working device for driving a heavy construction equipment. The pivot joint 5 in the swash plate center and the transverse piston 6 in the direction of the rotation axis, and the second transverse piston 7 and the second transverse pilot pressure flow path 9 in the direction opposite to the axis of rotation relative to the cover joint. And when the pilot pressure is not applied to the second script pilot pressure passage 10, the swash plate is warped at the maximum tilt angle, and the pilot pressure acts on the first script pilot pressure passage and the second script pilot pressure passage is applied to the second script pilot pressure passage 10. When the pilot pressure acts at the same time, the swash plate is tilted at any intermediate tilt angle between the maximum and minimum tilt angles, and the first and second tilt pistons 7 and 7 are provided with the pilot pressure. Pressure on cotton A shaft spring is installed, and a shock absorbing spring is installed to prevent rapid return shock when the pilot pressure is drained. The pivot joint (5) is positioned vertically on the line on which the reference force F1, which is the force of the high pressure side piston, acts. At a distance a, the first light force F2 acts perpendicularly to the pivot joint reference force F1 acting against the direction of the force F1 force on the distance b, and the second light force F3 acts on the pivot joint reference force F1. It is a hydraulic driving system composed of moment moments of force of F1 × aF2 × bF3 × c, which acts against the direction of the reference force F1 at a distance C in the vertical direction.

In other words, as shown in FIG. 1, the shoe 2 installed at the tip of the piston 1 contacts the swash plate 3 to rotate about the motor shaft 4, and the force acting on the swash plate 3 A pivot joint 5 of the swash plate warp center is installed at a distance from the action line F1, and a first tilt wheel piston 6 is installed at a distance b position in the direction of the motor axis 4 with respect to the pivot joint 5, and the pivot The second light warp piston 7 and the stopper plate 8 are installed at an arbitrary position C in the direction opposite to the motor shaft 4 with respect to the joint 58, and the pilot in the first light warp pilot pressure flow path 9. When no pressure is applied, the swash plate 3 under the design condition F1 × aF2 × bF3 × c, which is a static swash plate static parallel condition, is warped at the maximum tilt angle (speed 1) of 01 and comes into contact with the shoe 2 to make the piston (1) The piston stroke distance S is longer than the middle sloping angle 03 (speed 2) or the minimum sloping angle 05 (three speed) of the swash plate. The rotational speed of the block 11 is made to rotate relatively low speed, the running speed becomes a low speed.

More specifically,

When P and Q are constant, the motor speed N becomes inversely proportional to the swash plate angle.

When the pilot pressure acts on the first script pilot pressure flow path 9, the swash plate 3 is warped at a minimum tilt angle (3 speed) of 05 based on the swash plate static parallel condition, and the motor rotates at high speed, and the driving speed is high. Becomes

When the pilot pressure acts on the first script pilot pressure flow path 9 and the pilot pressure acts on the second script pilot pressure flow path 10 at the same time, the swash plate 3 is in the swash plate of 03 according to the swash plate static parallel condition. Fixed to each tilt angle, the motor rotates at medium speed and the running speed becomes medium speed.

The effect of the present invention by the above configuration is that the swash plate tilt angle control can be selected in three ways, so it is possible to secure low-speed, high manpower when driving on slopes and rough rough terrain, and it is possible to select high speed and medium speed on a good flat surface, and thus work performance. Improvements and greater choice of engine horsepower have the potential to save fuel.

Claims (1)

In the hydraulic motor driving system, which is a hydraulic working device for driving heavy construction equipment, the shoe (2) installed at the tip of the piston contacts the swash plate (3) and is eccentric to the rotation axis of the swash plate type hydraulic motor rotating around the motor side (4). A stopper plate for controlling the stroke of the second light warp piston 7 and the second light warp piston in the direction opposite to the rotation axis with the pivot joint 5 in the center of the light and the rotation joint in the direction of the axis of rotation. 8), in the structure where the first light piston (6) and the second light piston (7) are provided with a compression spring on the surface on which the pilot pressure acts, the pivot joint (5) position is the force of the high pressure side piston thrust. The first light force F2 acts vertically on the line b on which the reference force F1 acts, and the first light force F2 acts opposite the direction of the force F1 force on the distance b in the vertical direction on which the pivot joint reference force F1 acts, Second scripture The force F3 is located in a counter-vertical direction in which the pivot joint reference force F1 acts and acts against the direction of the reference force F1 at a distance C to constitute a moment condition of the force of F1 × aF2 × bF3 × c. Hydraulic traveling control system of construction heavy equipment.